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Study on the Metastable Equilibrium of the Quinary System Li+, K+//CO32-, SO42-,B4O72--H2O at 273K

Author: QuShuDong
Tutor: SangShiHua
School: Chengdu University of Technology
Course: Chemical processes
Keywords: Metastable equilibrium Carbonate Sulfate Borate Solubility Pitzer equation
CLC: O642.42
Type: Master's thesis
Year: 2008
Downloads: 73
Quote: 1
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Abstract


The study by isothermal evaporation method the the five system Li K / / CO 3 2 - SO 4 2 - , B 4 O 7 2 - -H 2 < / sub> the O its part four Motoko system Li / / CO 3 2 - , the SO 4 < sup> 2 - , B 4 O 7 2 - -H 2 O, K < sup> / / CO 3 2 - , SO 4 2 - , B 4 O 7 2 - H 2 O and Li , K / / CO 3 2 - , SO 4 2 - -H 2 O 273K the metastable equilibrium relationship measured solubility and solution density of the system at 273K under conditions, the metastable phase diagram is drawn based on the experimental data. The study found the quinary system metastable balanced double salt K 2 SO 4 · Li 2 SO 4 generate 4 full points in its metastable phase diagram, 9 univariant curve the six crystalline regions, the equilibrium solid phase were the LiBO 2 · 8H 2 O, K 2 B 4 O 7 · 4H 2 O, K 2 CO 3 · 3/2H 2 O, K 2 SO 4 , Li 2 SO 4 · H 2 O, Li 2 CO 3 , double salt K 2 < / sub> SO 4 · Li 2 SO 4 . Simple the four Motoko system Li 2 - / / CO 3 the SO 4 the 2 - , B 4 O 7 2 - -H 2 O, there is a saturation point, 3 univariant curve equilibrium solid phase of LiBO 2 · 8H 2 O, Li 2 SO 4 · H 2 O, Li 2 CO 3 , the phase diagram LiBO 2 · 8H 2 O crystalline regions the of Li 2 · H the SO 4 2 O crystalline regions. Simple the four Motoko system K / / CO 3 2 - , the SO 4 2 - O B 4 7 2 - -H 2 O is simple common-saturated type, there is a total saturation point, three univariant curve equilibrium solid phase have K 2 the CO 3 · 3/2H 2 O, K 2 SO 4 , K 2 B 4 O 7 · 4H 2 < / sub> O, the crystalline regions K 2 B 4 O 7 · 4H 2 O maximum, K < sub> 2 CO 3 · 3/2H 2 O crystalline regions minimum. The interactive four Motoko system Li 2 - , K / / CO 3 SO 4 2 - -H 2 O double salt K 2 SO 4 · of Li 2 < / sub> SO 4 generate metastable phase diagram, there are a total of three full points, seven univariant curves, the equilibrium solid phase K 2 CO 3 · 3/2H 2 O, Li 2 CO 3 , K 2 SO 4 , of Li , 2 SO 4 · H 2 the O complex salt K 2 SO < sub> 4 · Li 2 SO 4 , where K 2 CO 3 · 3/2H 2 O crystalline regions of minimum crystallization zone is Li 2 CO 3 . With the quaternary system 273K metastable equilibrium solubility data using multiple linear regression fit the the Pitzer equation 273K five yuan System Li K / / CO < sub> 3 2 - , SO 4 2 - , B 4 O 7 the the 2 - the-H 2 O involved a single salt parameters and mixed ion interaction parameters; 273K when the salt dissolved equilibrium constant calculated using Pitzer equation theory of metastable equilibrium of the quinary system simulation, and the predicted results are analyzed and discussed.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical thermodynamics, thermochemistry, thermodynamic equilibrium > Thermodynamic equilibrium > Phase Equilibria
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