Relevant bibliographies by topics / Na2CO3

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Academic literature on the topic 'Na2CO3'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Na2CO3"

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Kochkarov, Zh A., M. V. Khubaeva, I. A. Shogenov, and Z. L. Khakulov. "NaBO2-NaCl-Na2CO3, NaBO2- Na2CO3-NaMoO4, NaBO2- Na2CO3-NaWO4, and NaBO2-NaCl-Na2WO4 ternary systems." Russian Journal of Inorganic Chemistry 56, no. 6 (June 2011): 946–53. http://dx.doi.org/10.1134/s0036023611060106.

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Aliev, Z. A., M. G. Kakagasanov, A. R. Aliev, I. R. Akhmedov, and A. I. Akaeva. "Raman spectra of binary systems Li2CO3–Li2SO4, Na2CO3–Na2SO4, K2CO3–K2SO4." Herald of Dagestan State University 33, no. 1 (2018): 28–36. http://dx.doi.org/10.21779/2542-0321-2018-33-1-28-36.

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3

Zhang, Yang, Shili Zheng, Hao Du, Hongbin Xu, and Yi Zhang. "Phase Equilibria in the NaOH−Na2CrO4−Na2CO3−H2O System." Journal of Chemical & Engineering Data 55, no. 7 (July 8, 2010): 2542–45. http://dx.doi.org/10.1021/je900900m.

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Peng, Ke Wu, Peng Zhang, Jian Guo Xie, and He Li Ma. "Study on Properties of Al2O3 –CaO-Na2CO3 Slag System." Advanced Materials Research 391-392 (December 2011): 1302–5. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.1302.

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Liquidus temperature, electrical conductivity and phase composition of Al2O3-CaO-Na2CO3 slag were studied in the paper. The results showed that the minimum value of liquidus temperature was 1429°C when the content of Na2CO3 was 11%. The Al2O3-CaO-Na2CO3 slag of lower liquidus temperature had higher electrical conductivity, and the electrical conductivity of Al2O3-CaO-Na2CO3 slag increased with the increase of temperature. The main phases of Al2O3-CaO-Na2CO3 slag are composed of CaAl2O4, Ca3Al10O18, NaAlO2 and Na2CO3. The addition of Na2CO3 is to be more effective for decreasing liquidus temperature and increasing electrical conductivity in the Al2O3-CaO-Na2CO3 slag system.
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Jamshidiyan, M., A. S. Shirani, and Gh Alahyarizadeh. "Solvothermal synthesis and characterization of magnetic Fe3O4 nanoparticle by different sodium salt sources." Materials Science-Poland 35, no. 1 (February 24, 2017): 50–57. http://dx.doi.org/10.1515/msp-2017-0004.

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AbstractFour different magnetic Fe3O4 nanoparticles were synthesized and characterized by solvothermal method based on different sodium salts. Sodium salts which were used to synthesize the nanoparticles were NaOAc, Na2CO3, a mixture of NaOAc and Na3Cit, and a mixture of NaOAc and Na2C2O4. The structural and optical properties of the synthesized nanoparticles were examined by XRF, XRD, SEM and FT-IR. The results estimated from XRD pattern and SEM image indicated that the second sample (Na2CO3) had the lowest average particle and crystallite size around 29 nm and 43 nm. It was also shown that the first (NaOAc) and second (Na2CO3) samples had the best FT-IR spectra, similar to the available commercial sample which was provided by Merck. At last, the prepared Fe3O4 nanoparticles were applied as sorbents to sorb uranium ions (U(VI)) from radioactive wastewater. The adsorption results showed that the highest U(VI) adsorption was obtained for the second sample in the solution with pH around 10.
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Zhu, Jufang, Qiuying Li, Yanchao Che, Xingchen Liu, Chengcheng Dong, Xinyu Chen, and Chao Wang. "Effect of Na2CO3 on the Microstructure and Macroscopic Properties and Mechanism Analysis of PVA/CMC Composite Film." Polymers 12, no. 2 (February 14, 2020): 453. http://dx.doi.org/10.3390/polym12020453.

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Polyvinyl alcohol (PVA)/carboxyl methyl cellulose sodium (CMC)/Na2CO3 composite films with different contents of Na2CO3 were prepared by blending and solution-casting. The effect of Na2CO3 on the microstructure of PVA/CMC composite film was analyzed by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC), and atomic force microscopy (AFM). Its macroscopic properties were analyzed by water sorption, solubility, and dielectric constant tests. The results show that the microstructure of PVA/CMC/Na2CO3 composite films was different from that of PVA and PVA/CMC composite films. In addition, compared to PVA and PVA/CMC composite films, the water sorption of PVA/CMC/Na2CO3 composite films relatively increased, the solubility in water significantly decreased, and the dielectric properties significantly improved. All these results indicate that the hydrogen bonding interaction between PVA and CMC increased and the crystallinity of PVA decreased after the addition of Na2CO3. This was also a direct factor leading to increased water sorption, decreased solubility, and enhanced dielectric properties. The reaction mechanism of PVA, CMC, and Na2CO3 is proposed to further evaluate the effect of Na2CO3 on the microstructure and macroscopic properties of PVA/CMC/Na2CO3 composite films.
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Leaist, Derek G., and Robert A. Noulty. "Multicomponent diffusion of aqueous sodium carbonate and aqueous sodium bicarbonate." Canadian Journal of Chemistry 63, no. 8 (August 1, 1985): 2319–23. http://dx.doi.org/10.1139/v85-383.

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Diffusion coefficients of Na2CO3 + H2O and NaHCO3 + H2O have been measured by a conductimetric technique at 25 °C. Above 0.1 mol L−1, diffusion of aqueous Na2CO3 is typical of a simple binary electrolyte. At lower concentrations a significant proportion of the Na2CO3 component diffuses as NaHCO3 and NaOH produced by hydrolysis: [Formula: see text]. Because OH− is more mobile than HCO3−, binary Na2CO3 + H2O solutions undergoing diffusion separate spontaneously into two ternary solutions: Na2CO3 + NaOH + H2O ahead of the diffusion boundary and Na2CO3 + NaHCO3 + H2O left behind the boundary. A procedure is developed for measuring multicomponent diffusion coefficients of hydrolyzing salts. Results for Na2CO3 are in satisfactory agreement with predicted ternary values. As a consequence of the disproportionation reaction: [Formula: see text], diffusion of aqueous NaHCO3 is formally a ternary process. However, because reactants and products have similar mobilities and because only about 1% of the salt disporportionates, diffusion of aqueous NaHCO3 is effectively binary.
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Kim, Taewan, and Yubin Jun. "Mechanical Properties of Na2CO3-Activated High-Volume GGBFS Cement Paste." Advances in Civil Engineering 2018 (June 25, 2018): 1–9. http://dx.doi.org/10.1155/2018/8905194.

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The use of Na2CO3 to improve the mechanical properties of high-volume slag cement (HVSC) is experimentally investigated in this study. Ordinary Portland cement (OPC) was replaced with 50, 60, 70, 80, and 90% ground-granulated blast-furnace slag (GGBFS) by weight. Na2CO3 was added at 0, 1, 2, 3, 4, and 5 wt.% of HVSC (OPC + GGBFS). The compressive strength, water absorption, ultrasonic pulse velocity, dry shrinkage, and X-ray diffraction spectra of the Na2CO3-activated HVSC pastes were analyzed. The results indicate that Na2CO3 was effective for improving the strength of HVSC samples at both early and later ages. There was a trend of increasing HVSC sample strength with increasing Na2CO3 content. The 5% Na2CO3-activated HVSC (50% OPC + 50% GGBFS) paste had the best combination of early to later-age strength development and exhibited the highest UPV and the lowest water absorption among the Na2CO3-activated HVSC samples at later age.
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Palatý, Zdeněk. "Density of Aqueous Solutions of Na2CO3-NAHCO3." Collection of Czechoslovak Chemical Communications 59, no. 7 (1994): 1571–83. http://dx.doi.org/10.1135/cccc19941571.

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The paper deals with a correlation of the ternary systems H2O - Na2CO3 - NaHCO3. The corresponding data have been correlated with an equation presuming the additivity of partial molar volumes, the components being water and the so-called basic solutions of Na2CO3 and NaHCO3. From the comparison of experimental and calculated density values of the solutions of Na2CO3 - NaHCO3, Na2CO3, and NaHCO3 at 20 °C it follows that the given procedure provides very precise results.
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Wang, Chun Huy. "Effect of Na2CO3 Addition on the Piezoelectric and Dielectric Properties of Lead-Free (Na0.5K0.5)NbO3-(Na0.5Bi0.5)TiO3 Ceramics." Advanced Materials Research 716 (July 2013): 113–18. http://dx.doi.org/10.4028/www.scientific.net/amr.716.113.

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Lead free piezoelectric ceramics 0.98(Na0.5K0.5)NbO3-0.02(Na0.5Bi0.5)TiO3[abbreviated as 0.98NKN-0.02NB with the addition of 0~1.0 wt% Na2CO3have been synthesized by the conventional mixed oxide process. The effects of amount of Na2CO3-content on the electrical properties and crystalline structures were investigated. The specimens of 0.98NKN-0.02NBT ceramics added with Na2CO3maintain an orthorhombic phase. In the case of low Na2CO3content ( 0.3 wt%), the grain growth became remarkable. The increase of grain size favors improving the piezoelectric properties, which is known as grain size effect. The grain size effect compensates the decrease of the electromechanical coupling factor due to the hard doping effect. For 0.98NKN-0.02NBT ceramics by doping 0.3 wt% Na2CO3, the electromechanical coupling coefficients of the thickness modektand the planar modekpreach 0.51 and 0.33, respectively, after sintering at 1100 °C for 3 h. Moreover, the addition of excess Na2CO3is a helpful method on ceramic processing to improve the dielectric tangent loss and the mechanical quality factor. Our results show that 0.98NKN-0.02NBT with the addition of 0.3 wt% Na2CO3is a good lead-free piezoelectric ceramic.
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Dissertations / Theses on the topic "Na2CO3"

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Petit, Luc. "Etude de la corrosion d'alliages de fer et de nickel par les mélanges Na2SO4, Na2CO3, NaCl et Na2CO3, Na2S, Na2SO4, NaCl entre 300oC et 900oC : application aux chaudières de récupération (procédé KRAFT)." Grenoble INPG, 1986. http://www.theses.fr/1986INPG0119.

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Etude de la corrosion en milieu de sels fondus (melanges na::(2)so::(4), na::(2)co::(3), nacl et na::(2)co::(3), na::(2)s, na::(2)so::(4), nacl) pour des temperatures comprises entre 300**(o)c et 900**(o)c d'alliages de nickel (in800, in600. . . ) et d'aciers inoxydables (z6cn1810, z12cn25-20. . . ). Mesure des variations de masse et examen des produits formes. Influence d'un traitement de surface. Influence de la composition de l'alliage. Mecanisme de corrosion
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Grynberg, Julien. "Mécanismes physiques et chimiques mis en jeu lors de la fusion du mélange SiO2-Na2CO3." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00829455.

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Entre l'enfournement des matières premières sur le bain liquide et le verre la sortie du four, on peut s'interroger sur les étapes par lesquelles le mélange vitrifiable passe avant d'être transformé en un liquide homogène. D'un point de vue chronologique, l'élaboration du verre peut être considérée en trois étapes : l'état initial du mélange granulaire avant réaction ; l'étape de réaction chimique entre les différents constituants ; un liquide avec ses inclusions gazeuses et solides (bulles et quartz résiduel). Chacune de ces étapes concerne un domaine spécifique, avec un fort couplage entre physique et chimie. Aborder la façon dont réagissent ces matières premières ensemble et comment la microstructure peut influencer le chemin réactionnel suivi globalement par le mélange est indispensable pour savoir a chaque moment de la transformation quels mécanismes sont mis en jeu. Cela permettrait de corriger certains problèmes liés à l'élaboration d'un verre industriel (bulles piégé es dans le liquide, grains de quartz non incorporés au liquide, hétérogénéité chimique du liquide). La variété de phénomènes possibles lors de la fusion d'un mélange vitrifiable industriel nous poussera à simplifier le système un maximum, afin d'être capable de relier l'évolution de la microstructure à celle de la chimie du matériau. C'est la raison pour laquelle nous avons décidé d'étudier le système SiO2-Na2CO3. Nous avons de plus utilisé des grains tamisés dans des tranches précises, afin de pouvoir relier la transformation chimique du mélange à la répartition spatiale initiale du mélange granulaire.
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Ben, Ali Amor. "Les systèmes Na2CO3-(YbF3 ou YF3)-H2O : synthèse hydrothermale, études structurales et spectroscopiques." Le Mans, 2003. http://cyberdoc.univ-lemans.fr/theses/2003/2003LEMA1008.pdf.

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Deux systèmes hydrothermaux, Na2CO3-W3-H20 (M=Yb, Y),. Sont explorés par chauffage micro-onde à 190'C dans une large gamme de compositions. Trois phases nouvelles (Yb(CO3)(OH,F)-XH20, Na2M(CO3)2F, Na3M(CO3)2F2 (M=Yb, Y) Na4Y(CO3)2F3-H2O) sont mises en évidence dans chaque système. A T>190°C, Na3Y(CO3)3-6H20, Na5y(CO3)4 et Nay2(CO3)3F apparaissent. En présence de Li2CO3, une seule phase cubique Na2LiLn(CO3)3 subsiste pour les deux systèmes, ainsi que pour la série des lanthanides Eu-Lu. Un désordre Na-'/Ln 3+ affecte trois des phases mentionnées, Na3M(CO3)2F2 (Yb, Y) et Na2LiLn(CO3)3. Dans Na2LiY(CO3)3, la RMN montre que Li+ est animé d'une agitation rapide dans son polyèdre de coordination. La comparaison des spectres RNIN 3Q-NUS de Na5Y(CO3)4 et Na2LiY(CO3)3 suggère une coordinence proche de 6 pour Na-' dans Na2LiY(CO3)3. La microscopie électronique indique, par ailleurs, que les structures de Na3M(CO3)2F2 (Yb, Y) présentent une modulation liée à l'empilement de feuillets [NaM(CO3)2F2]
Two hydrothermal systems, Na2CO3-MF3-H20 (M = Yb, Y), are investigated by mierowave assisted synthesis in large concentration domains at 190'C. Three unknown phases are evidenced in each system: Yb(CO3)(OH,F). H20, Na2Yb(CO3)2F, Na3Yb(CO3)2F2; Na2Y(CO3)2F, Na3y(CO3)2F2. Na4Y(CO3)2F3. H20. At higher température, Na3y(CO3)3-6H20, Na5Y(CO3)4 and Nay2(CO3)3F appear. With Li2CO3, one cubic phase Na2LiLn(CO3)3 exists for both systems and for Ln = Eu- Lu. Na -1 /Ln 3+ disorder affects three of the mentioned phases: Na3M(CO3)2F2, (M = Yb, Y) and the famdy Na2LiLn(CO3)3- hi Na2LiY(CO3)3, NMR spectroscopy indicates that Li+ is only submitted to fast thennal motion in its coordination polyhedron. The comparison of 3Q-NIAS NMR results for Na+ in Na5Y(CO3)4 and Na2LiY(CO3)3 suggests a coordination number close to six for Na+ in Na2LiY(CO3)3- Electron microscopy indicates that the structures of Na3M(CO3)2F2 (M = Yb, Y) present a modulation related to the stacking of the [NaM(CO3)9F2],,,, (M = Yb or Y) layers
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NASCIMENTO, Neyber Fádio Cavalcanti. "Reologia de argilas bentoníticas do Estado da Paraíba aditivadas com MgO para uso em tintas base água." Universidade Federal de Campina Grande, 2016. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1122.

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Devido a suas propriedades reológicas, uma grande quantidade de bentonitas são empregadas como aditivos para tintas como agentes espessantes, estabilizadores e antisedimentantes. Este trabalho teve por objetivo avaliar os efeitos da ativação individual e conjunta por Na2CO3 e MgO nas propriedades reológicas de argilas bentoníticas policatiônicas do estado da Paraíba visando o uso das mesmas como agentes espessantes de tintas de base água.Foram utilizadas argilas bentoníticas policatiônicas do estado da Paraíba das ocorrências de Boa Vista e Cubati, denominadas de Chocolate Boa Vista (CH BV) e Chocolate Campos Novos (CH CN), respectivamente. A caracterização física, química e mineralógica das amostras foi realizada pelos seguintes métodos: análise granulométrica (AG), fluorescência de raios X (EDX), difração de raios X (DRX), capacidade de troca de cátions (CTC), área específica (AE), análise térmica diferencial (ATD) e análise termogravimétrica (ATG). Os percentuais dos aditivos Na2CO3 e MgO foram de 0,0%, 0,5%, 1,0%, 1,5%, 2,0%, 3,0% e 4,0% quando utilizados de forma individual e de 0,5%, 1,0%, 1,5% de MgOe 0,5%, 1,0%, 1,5% de Na2CO3 associados de modo que todas as combinações fossem analisadas.Os resultados obtidos foram comparados com as especificações API e ISO de bentonitas para uso em tintas base água. A ativação apenas com MgO não proporcionou maiores valores de viscosidade às suspensões bentoníticas estudadas. A ativação apenas com Na2CO3, na forma sólida, e com ambos aditivos aumentou a viscosidade das dispersões bentoníticas com argila CH BV e foram observados comportamentos reológicos do tipo pseudoplástico com tensão de escoamentoe tixotrópico. Verificou-se também que as argilasCH BV e CH CN, com ambos aditivos, apresentaram comportamentos pseudoplástico com tensão de escoamentoe tixotrópico. Conclui-se que as bentonitas CH BV e CH CN podem ser utilizadas como espessantes de tintas de base água.
Due to its rheological properties, a large amount of bentonites are used as additives for paints as thickeners, stabilizers and anti-settling. This study aimed to evaluate the effects of individual and joint activation Na2CO3 and MgO in the rheological properties of polycationic bentonite clays of the Paraíba state aimed at using them as thickeners for water-based paints. Polycationic clays were used bentonite state of Paraiba occurrences of Boa Vista and Cubati, called Chocolate Boa Vista (CH BV) and Chocolate Campos Novos (CH CN), respectively. The physical, chemical and mineralogical samples was performed by the following methods: Particle size analysis (GA), X-ray fluorescence XDE), X-ray diffraction (XRD), capacity of cation exchange (CEC), specific area (SA), differential thermal analysis (DTA) and thermal gravimetric analysis (TGA). The percentages of MgO and additives Na2CO3 were 0.0%, 0.5%, 1.0%, 1.5%, 2.0%, 3.0% and 4.0% when used individually, and 0.5%, 1.0%, 1.5% MgO and 0.5%, 1.0%, 1.5% Na2CO3 associated so that all combinations were analyzed. The results obtained were compared with API bentonite and ISO specifications for use in water based paints. Activation only with MgO did not provide higher viscosity values for bentonite suspensions studied. Activation only with Na2CO3, in solid form, and with both additives increased the viscosity of bentonite clay dispersions with CH BV and were observed rheological behavior of the pseudoplastic type with yield stress and thixotropic. It was also found that the clays CH BV and CH CN with both additives, presented pseudoplastic behavior with yield stress and thixotropic. It follows that the bentonite and CH CN CH BV can be used as thickeners in water based paints.
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Aissa, Rabha. "Coprécipitation d'ions FeII et FeIII par Na2CO3 en milieu sulfaté et synthèse de la rouille verte substituée aluminium." Nancy 1, 2004. http://www.theses.fr/2004NAN10154.

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L'étude de la substitution des cations FeIII par les cations AlIII dans la structure de RV2(SO42-) montre qu'il est nécessaire d'introduire en solution un excès d'ions FeII par rapport à la formule chimique FeII4FeIII2(OH)12(SO4). 8H2O pour obtenir une seule phase de rouille verte sulfatée substituée aluminium. Ce nouveau composé se caractérise par une taille de cristaux de l'ordre de 50 nm et un spectre Mössbauer constitué par un doublet ferreux supplémentaire. La coprécipitation des ions FeII et FeIII en milieu sulfaté par la base faible Na2CO3 a été étudiée. Le taux d'alcalinisation et le temps de vieillissement des précipités sont les facteurs essentiels qui conditionnent la formation des rouilles vertes. Pour des taux d'alcalinisation croissant, la rouille verte sulfatée précède la formation de la rouille verte carbonatée {RV1(CO32-)}. Les rouilles vertes alors obtenues sont instables vis-à-vis d'un mélange de magnétite et de sidérite et nécessitent une analyse immédiate après synthèse. Cette transformation est inhibée par la présence d'anions silicate dans le milieu réactionnel qui réagissent avec la surface des rouilles vertes empêchant ainsi leur dissolution
Formation of sulphated green rust {RV2(SO42-)} is preceded by precipitation of a sulphated ferric basic salt and a badly crystallized ferric oxyhydroxyde. The study of the substitution of the FeIII cations by the AlIII cations in the structure of RV2(SO42-) shows that it is necessary to introduce an excess of FeII ions in solution as required for the stoichiometry of the green rust to obtain a single phase aluminium substituted sulphated green rust. This new compound is characterized by a crystal size of about 50 nm and the Mössbauer spectrum is characterised additional ferrous doublet. The coprecipitation of the FeII ions and FeIII in sulphated medium by the weak Na2CO3 was studied. Green rusts then obtained are unstable and require immediate analysis after synthesis. This transformation is inhibited by the presence of silicate anions in the reaction medium which react with the surface of green rusts thus preventing their dissolution. The transformation of the RV2(SO42-) in RV1(CO32-) is carried out by exchange of anions
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Szczesiul, Beata. "Mise en pâte d'explosion du panic érigé : effet du Li2CO3 et ZnCO3 en comparaison avec Na2CO3, NaHCO3, et MgCO3 /." Thèse, Trois-Rivières : Université du Québec à Trois-Rivières, 2001. http://www.uqtr.ca/biblio/notice/resume/03-2235606R.html.

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CORRÊA, Onésimo Amorim. "Produção de biocombustíveis em diferentes escalas via craqueamento térmico catalítico de resíduos de caixa de gordura com catalisador Na2CO3." Universidade Federal do Pará, 2015. http://repositorio.ufpa.br/jspui/handle/2011/7691.

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O presente trabalho apresenta a gordura residual retirada de caixas retentoras de gordura como uma matéria-prima potencial e alternativa para produção de combustíveis renováveis. A gordura residual foi utilizada como carga em experimentos de craqueamento térmico catalítico em Unidades de Bancada, Semi-Piloto e Piloto. Diferentes teores de carbonato de sódio (5%, 10% e 15%) foram utilizados como catalisador nos experimentos de craqueamneto térmico catalítico. Os produtos líquidos orgânicos (PLO’s) obtidos nos experimentos de craqueamento foram destilados em unidades de destilação em escala de bancada e piloto. Os processos de destilação resultaram na obtenção de frações de hidrocarbonetos nas faixas do querosene, diesel leve e pesado. Os PLO’s juntamente com as frações de diesel verde leve e pesado foram caracterizados de acordo com as especificações estabelecidas pela norma da ANP Nº 65 para óleo diesel S10. As frações de querosene verde foram caracterizadas de acordo com as especificações estabelecidas pela norma da ANP Nº 37 para querosene derivado do petróleo. Os resultados mostraram que os PLO’s apresentaram baixos valores para o índice de acidez, além disso, foi confirmado que a utilização de diferentes percentuais do catalisador carbonato de sódio nas três escalas de produção contribuiu para a obtenção de resultados promissores quanto ao rendimento e as características físico-químicas e composicionais, indicando a eficiência deste catalisador básico. Os resultados também mostraram que as frações de querosene verde, diesel verde leve e pesado apresentaram baixos teores de ácidos graxos livres, rendimentos significativos e características físico-químicas consonantes com as suas respectivas normas. Os experimentos que utilizaram o percentual de 10% de carbonato de sódio como catalisador apresentaram os maiores rendimentos, os menores índices de acidez e os melhores resultados das caracterizações físico-químicas e composicionais entre todos os testes feitos neste estudo. O PLO produzido utilizando o teor de 10% de carbonato de sódio apresentou um total de 78,98% de hidrocarbonetos em sua composição, enquanto o querosene verde obtido após a destilação deste mesmo PLO apresentou um total de 92,64% de hidrocarbonetos em sua composição, estes resultados foram ratificados através de análises como: FT-IR, RMN e GC-MS.
This paper presents the residual fat taken from retaining grease traps as a potential feedstock for the production of alternative and renewable fuels. The residual oil was used as filler in experiments catalytic thermal cracking countertop units, Semi-pilot and pilot. Different levels of sodium carbonate (5%, 10% and 15%) were used as a catalyst in the catalytic thermal craqueamneto experiments. Organic liquids (PLO's) obtained in the cracking experiments were distilled in distillation units in bench and pilot scale. Distillation processes resulted in the development of hydrocarbon fractions in kerosene bands, light and heavy diesel. The PLO's with the green light and heavy diesel fractions were characterized according to the specifications established by the standard of ANP 65 for diesel S10. The green kerosene fractions were characterized according to the specifications established by the standard of ANP 37 for petroleum-based kerosene. The results showed that the PLO's had low values for the acid value, moreover, it was confirmed that the use of different percentages of catalyst ash in the three scales of production contributed to obtaining promising results in terms of yield and physico -chemical and compositional, indicating the efficiency of this basic catalyst. The results also showed that the fractions of green kerosene, heavy and light green diesel had low levels of free fatty acids, significant income and physical and chemical characteristics in line with their respective standards. The experiments using the percentage of 10% sodium carbonate as catalyst showed the highest incomes, lower levels of acidity and the best results of physicochemical and compositional characterization of all the tests in this study. The PLO produced using the level of 10% of sodium carbonate showed a total of 78.98% of hydrocarbons in the composition, while the green kerosene obtained after distillation of the same PLO showed 92.64% total hydrocarbons in its composition, these results were confirmed by analysis as FT-IR, RMN and GC-MS.
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Szczesiul, Beata. "Mise en pâte d'explosion du panic érigé : effet du Li2CO3 et ZnCO3 en comparaison avec Na2CO3, NaHCO3, et MgCO3." Thèse, Université du Québec à Trois-Rivières, 2001. http://depot-e.uqtr.ca/2755/1/000685472.pdf.

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Silva, Carlos Eduardo. "Estudo do Sistema Vítreo SNABP (SiO2 Na2CO3 Al2O3 B2O3 PbO2) Nanoestruturado com Pontos Quânticos de PbS e Dopado com Íons Er3+." Universidade Federal de Uberlândia, 2011. https://repositorio.ufu.br/handle/123456789/15643.

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Fundação de Amparo a Pesquisa do Estado de Minas Gerais
The SNABP [40SiO2.30Na2CO3.1Al2O3.25B2O3.PbO2 (mol%)] glass system, nanostructured with PbS Quantum Dots (QDs) and/or doped with Er3+ ions, was successfully synthesized by the Fusion Method, when it was subjected to appropriate thermal annealing. The glass transition temperatures (Tg) were obtained by Differential Thermal Analyze (DTA), in which it was possible to define a suitable temperature to be used in the thermal annealing of the synthesized samples. As results of these thermal annealing, the formation and growth of PbS QDs have occurred in the glass environment. The optical properties of samples were investigated by Optical Absorption (OA), Photoluminescence (PL), and Photoluminescence with Temporal Resolution (PLTR). Moreover, the Atomic Force Microscopy (AFM) and X-Ray Diffractometry were employed in study of morphological and structural properties of samples, respectively. The size dispersions of PbS QDs were determined from OA spectra. Once using both the Method and OA data, it was also possible to estimate the average diameters of these nanoparticles, which grow with the increase in annealing time. The characteristic transitions of Er3+ ions were clearly identified in OA spectra. In addition, it was observed that the increase in annealing time of samples had provoked amplification in the overlapping between PL bands of both the PbS QDs and Er3+ ions, as well as with the absorption 4I15/2 -> 4I13/2 of these ions. Thus, the PLTR measurements have confirmed the decrease in lifetime of the 4I13/2 level (of Er3+ ions), with the amplification in the overlapping of PL emissions. Finally, as a main result of this work, it was proved that the SNABP glass system, nanostructured with PbS QDs and doped with Er3+ ions, displays to be quite favorable to the radiative energy transfer process (from PbS QDs to Er3+ ions), as well as the occurrence of stimulated emission of 4I13/2 level.
O sistema vítreo SNABP [40SiO2.30Na2CO3.1Al2O3.25B2O3.PbO2 (mol%)] nanoestruturado com pontos quânticos (PQs) de PbS e/ou dopados com íons Er3+ foi sintetizado com sucesso pelo Método de Fusão, quando submetido a tratamentos térmicos apropriados. As temperaturas de transição vítrea (Tg) foram obtidas por Análise Térmica Diferencial (DTA), em que foi possível definir uma temperatura adequada para ser utilizada nos tratamentos térmicos das amostras sintetizadas. Como resultados desses tratamentos térmicos, a formação e crescimento dos PQs de PbS ocorreram no ambiente vítreo. As propriedades ópticas das amostras foram investigadas por Absorção Óptica (AO), Fotoluminescência (PL) e Fotoluminescência com Resolução Temporal (PLRT). Além disso, a Microscopia de Força Atômica (AFM) e Difratometria de Raios-X (DRX) foram empregadas no estudo das propriedades morfológicas e estruturais das amostras, respectivamente. As dispersões de tamanho dos PQs de PbS foram determinadas a partir dos espectros de AO. Com a utilização do Método e os dados de AO, foi também possível estimar os diâmetros médios dessas nanopartículas, que aumentaram com o aumento no tempo de tratamento térmico. As transições características dos íons Er3+ foram claramente identificadas nos espectros de AO. Em adição, foi observado que o aumento no tempo de tratamento das amostras provocou um aumento na sobreposição entre as bandas de PL dos PQs de PbS e dos íons Er3+, bem como com a absorção 4I15/2 -> 4I13/2 desses íons. Assim, as medidas de PLRT confirmaram o decréscimo no tempo de vida do nível 4I13/2 (dos íons Er3+) com o aumento dessa sobreposição das emissões de PL. Finalmente, como principal resultado deste trabalho, foi comprovado que o sistema vítreo SNABP nanoestruturado com PQs de PbS dopados com íons Er3+ mostrou-se bastante favorável ao processo de transferência de energia radiativa (dos PQs de PbS para os íons Er3+), bem como a ocorrência da emissão estimulada do nível 4I13/2.
Mestre em Física
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Lam, Raymond Kam-Fai. "Reactions of Na2SO4(l) and CoSo4-Na2SO4(l) with SO3(g) and Al2O3(s), 900 - 1250 K." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/105286.

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Books on the topic "Na2CO3"

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United States. Bureau of Mines. Na2CrO4 From Domestic Chromite Concentrates by an Alkali-Fusion Method. S.l: s.n, 1988.

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The 2006-2011 World Outlook for Sodium Sulfite (100 Percent Na2SO3). Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 World Outlook for Sodium Sulfite (100 Percent Na2SO3). ICON Group International, Inc., 2006.

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The 2006-2011 World Outlook for Sodium Metasilicate Anhydrous (100 Percent Na2SiO3). Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 World Outlook for Sodium Metasilicate Anhydrous (100 Percent Na2SiO3). ICON Group International, Inc., 2006.

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The 2006-2011 World Outlook for High Purity Sodium Sulfate (100 Percent Na2SO4). Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 World Outlook for High Purity Sodium Sulfate (100 Percent Na2SO4). ICON Group International, Inc., 2006.

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Choi, Ellen Eun-Ha. Multicomponent diffusion in the system K2O-Na2O-FeO-MgO-TiO2-P2O5-Al2O3-SiO2. 2004.

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Book chapters on the topic "Na2CO3"

1

Holze, Rudolf. "Ionic conductance of Na2CO3." In Electrochemistry, 1374–75. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49251-2_1222.

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Morais, C. A., J. S. Benedetto, and V. S. T. Ciminelli. "Recovery of Cerium by Oxidation/Hydrolysis with KMnO4- Na2CO3." In Electrometallurgy and Environmental Hydrometallurgy, 1773–82. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118804407.ch52.

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Shet, Vinayaka B., Nisha, Manasa Bhat, Manasa, Leah Natasha S. Mascarenhas, Louella C. Goveas, C. Vaman Rao, and P. Ujwal. "Optimization of Na2CO3 Pre-treatment by RSM Approach for Releasing Reducing Sugars from Cocoa Pod Shells." In Biotechnology and Biochemical Engineering, 85–91. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1920-3_9.

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Tenepalli, Jai Sai, and D. Neeraja. "Feasibility of Producing Class F Fly Ash Geopolymer Mortar with Alkaline Water Containing Sodium Carbonate (Na2CO3)." In Lecture Notes in Civil Engineering, 213–22. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-3317-0_19.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk, and I. Savysyuk. "Na2SO3." In Structure Types. Part 9: Space Groups (148) R-3 - (141) I41/amd, 209. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02702-4_120.

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Zhang, Jing, Guoping Luo, Yanbiao Chen, Wenbin Xin, and Jianguo Zhu. "Gasificating Dephosphorization During the Carbothermic Reduction of Medium Phosphorus Iron Ore Concentrate in the Presence of Na2CO3 and SiO2." In The Minerals, Metals & Materials Series, 35–45. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36628-5_4.

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Barbin, N. M., V. N. Necrasov, D. I. Terentiev, and A. P. Pekar. "Influence of a Gaseous Atmosphere on Anodic Processes of Glassy-Carbon and Gold Electrodes in NaCl-KCl-Na2CO3 Melt." In Refractory Metals in Molten Salts, 173–82. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-015-9135-5_17.

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Selimović, Amra, Halid Junuzović, Sabina Begić, and Ramzija Cvrk. "Efficiency of Precipitation and Removal of Pb(II) and Zn(II) Ions from Their Monocomponent and Two-Component Aqueous Solutions Using Na2CO3." In New Technologies, Development and Application II, 569–75. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-18072-0_65.

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Holze, Rudolf. "Ionic conductance of Na2SO3." In Electrochemistry, 1568. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49251-2_1399.

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Bückmann, Andreas F., Michael Morr, and Maria-Regina Kula. "The use of PEG-NADH/Na2Co3 Aqueous Two-Phase Systems for the Large-Scale Preparation of Technical Grade PEG-(Mr 20,000)-N6-(2-Aminoethyl)-NADH." In Separations Using Aqueous Phase Systems, 345–47. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-5667-7_56.

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Conference papers on the topic "Na2CO3"

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Xiang, Yu, Ying Zhao, Lu Liu, Zongming Zheng, and Changqing Dong. "Dynamic corrosion of refractories by Na2CO3." In 2015 4th International Conference on Sensors, Measurement and Intelligent Materials. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icsmim-15.2016.47.

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Beavers, John A., Carolyn L. Durr, and Burke S. Delanty. "High-pH SCC: Temperature and Potential Dependence for Cracking in Field Environments." In 1998 2nd International Pipeline Conference. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/ipc1998-2050.

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The objective of the work described in this paper was to establish the temperature and potential dependence for propagation of high-pH stress corrosion cracking (SCC) in field environments encountered on TransCanada PipeLine’s system in western Canada. Potentiodynamic and potentiostatic polarization techniques were used to identify the electrochemical potential range for performing SCC tests in the simulated field electrolytes. A slow strain rate technique was used for the SCC assessment. A standard 1N Na2CO3 – 1N NaHCO3 solution was included in the test program as a control. The more dilute simulated field electrolyte was a less potent cracking environment than the 1N Na2CO3 – 1N NaHCO3 solution in that the potential range for cracking was narrower and the maximum cracking velocity was lower at a given temperature. The center of the potential range for cracking with the simulated field electrolyte was consistently more negative than with the 1N Na2CO3 – 1N NaHCO3 solution. This may increase the likelihood that the pipe-to-soil potential of a cathodically protected pipeline lies in the cracking range.
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Badawi, Michael, Yann Foucaud, Lev Filippov, Odile Barres, Inna Filippova, and Sébastien Lebègue. "Synergistic Adsorptions of Na2CO3 and Na2SiO3 on Calcium Minerals Revealed by Spectroscopic and ab Initio Molecular Dynamics Studies." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.104.

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Jiang, Yifeng, Yanping Sun, Frank Bruno, and Sean Li. "A New Phase Change Material for High Temperature Thermal Energy Storage." In ASME 2016 10th International Conference on Energy Sustainability collocated with the ASME 2016 Power Conference and the ASME 2016 14th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/es2016-59219.

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The eutectic Na2CO3-NaCl molten salt was investigated as a new high temperature phase change material for solar thermal energy storage. The composition of the eutectic binary salt was determined with the aid of FactSage software and its thermophysical properties were investigated using a Simultaneous Thermal Analyzer, X-Ray Diffraction and a Scanning Electron Microscope. Eutectic Na2CO3-NaCl salt shows higher measurement values in a CO2 atmosphere than these in a N2 atmosphere in terms of heats of both fusion and solidification. Thermal stability analysis indicates that the eutectic molten salt has higher thermal stability in a CO2 environment without weight loss at temperatures below 700 °C compared with 0.51% weight loss at the melting point around 640 °C in a N2 atmosphere. The weight loss observed in the latter, is most likely to be due to the salt’s decomposition at high temperature. The thermophysical properties of the salt such as melting temperature, heats of both fusion and solidification, as well as the phase identification and phase morphology varied slightly after 100, 200 and 300 thermal cycle tests. Therefore, the eutectic Na2CO3-NaCl salt has a good thermal and phase stability. It therefore is a promising high temperature phase change material when used in a CO2 environment.
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Hatamachi, T., T. Kodama, Y. Isobe, D. Nakano, and N. Goukon. "Double-Walled Reactor Tube With Molten Salt Thermal Storage for Solar Tubular Reformers." In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76184.

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This paper proposes a novel type of “double-walled” reactor tube with molten-salt thermal storage at high temperatures for use in solar tubular reformers. The prototype reactor tube is demonstrated on the heat-discharge and chemical reaction performances during cooling mode of the reactor tube at laboratory scale. The Na2CO3 composite material with MgO ceramics was filled into the outer annulus of the double-walled reactor tube while the Ru-based catalyst particles were filled into the inner tube. The heat discharge form the molten Na2CO3 circumvented the rapid temperature change of the catalyst bed, which resulted in the alleviation of decrease in chemical conversion during cooling mode of the reactor tube. The application of the new reactor tubes to solar tubular reformers is expected to help realize stable operation of the solar reforming process under fluctuating insolation during a cloud passage.
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Wiemhoefer, H. D., H. Keller, S. Brosda, Ulrich Guth, and Wolfgang Goepel. "CO2 monitoring with solid state electrolyte devices based upon Na2CO3/BaCO3." In Environmental Sensing '92, edited by Tuan Vo-Dinh and Karl Cammann. SPIE, 1993. http://dx.doi.org/10.1117/12.140284.

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Malins, Kristaps. "PRODUCTION OF BIODIESEL USING K2CO3, K3PO4, NA2CO3 AND NA3PO4 AS ALKALINE CATALYSTS." In 18th International Multidisciplinary Scientific GeoConference SGEM2018. Stef92 Technology, 2018. http://dx.doi.org/10.5593/sgem2018/4.1/s17.075.

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Yu, Ping, Dengxiang Ji, Ning Ai, Fengwen Yu, and Jianbing Ji. "Study on separation the molten mixture of NaOH-Na2CO3 by molten crystallization." In 2011 International Conference on Electronics, Communications and Control. IEEE, 2011. http://dx.doi.org/10.1109/icecc.2011.6066719.

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Chen, Gong, Zhongning Shi, Dong Shi, Xianwei Hu, Bingliang Gao, Zhaowen Wang, and Yaxin Yu. "Research on electro-deposition of carbon from LiF-NaF-Na2CO3 molten salt system." In 2010 World Non-Grid-Connected Wind Power and Energy Conference (WNWEC). IEEE, 2010. http://dx.doi.org/10.1109/wnwec.2010.5673282.

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Ma, Junjun, and Shiqing Man. "Study on Surface Texturization of Monocrystalline Silicon Wafers with Na2CO3 and NaHCO3 Solutions." In 6th International Conference on Electronic, Mechanical, Information and Management Society. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/emim-16.2016.110.

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Reports on the topic "Na2CO3"

1

Shitade, Atsuo. Quantum spin Hall effect in a transition metal oxide Na2IrO3. Office of Scientific and Technical Information (OSTI), May 2010. http://dx.doi.org/10.2172/979955.

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Kostov-Kytin, Vladislav, and Rositsa Nikolova. New Data on Stannosilicate Phases Prepared in the System Na2O ‑ SnO2 ‑ SiO2 ‑ H2O. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, August 2019. http://dx.doi.org/10.7546/crabs.2019.08.09.

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