TY - JOUR
T1 - Study on the glycerol carbonate synthesis from glycerol and dimethyl carbonate
AU - Li, Jiabo
AU - Wang, Tao
PY - 2011
Y1 - 2011
N2 - The chemical equilibrium constants were determined for the reactions to produce glycerol carbonate from glycerol. Transesterification of glycerol with cyclic carbonates or alkyl carbonates is thermodynamically favorable for producing glycerol carbonate from glycerol according to the equilibrium constant Increasing temperature can increase the chemical equilibrium constant for the reaction of glycerol with dimethyl carbonate. For the reaction of glycerol with ethylene carbonate, increasing temperature can decrease the chemical equilibrium constant. The reaction of glycerol with carbon dioxide is thermodynamically limited. High temperature and low pressure are favorable to the reaction of glycerol and urea. The deactivation of the alkali solid catalysts, calcium oxide, calcium hydroxide and calcium methoxide was investigated. When the catalysts were recycled, the yield of glycerol carbonate all decreased dramatically. The alkali solid catalyst was converted to the basic calcium carbonate Cax(OH)y(CO3)z, which was the cause for the decrease of glycerol carbonate yield. It was found that the chemical interactions of the alkali solid catalyst with glyceol and glycerol carbonate leaded to the formation of the basic calcium carbonate Cax(OH)y(CO3)z, for which the mechanism was proposed.There were dissolution losses of the catalysts in the reaction medium. A new method, coupling reaction and azeotropic distillation was proposed for the synthesis of glycerol carbonate (GC) from glycerol (G) and dimethyl carbonate (DMC). The high yield of glycerol carbonate can be obtained at a low molar ratio of dimethyl carbonate to glycerol with the method of coupling reaction and azetropic distillation. Glycerol carbonate yield can be as high as 98%. By continuously removing methanol from reaction system with the method of coupling reaction and azeotropic distillation, the yield of glycerol carbonate can be retained at high level using the recycled catalyst.
AB - The chemical equilibrium constants were determined for the reactions to produce glycerol carbonate from glycerol. Transesterification of glycerol with cyclic carbonates or alkyl carbonates is thermodynamically favorable for producing glycerol carbonate from glycerol according to the equilibrium constant Increasing temperature can increase the chemical equilibrium constant for the reaction of glycerol with dimethyl carbonate. For the reaction of glycerol with ethylene carbonate, increasing temperature can decrease the chemical equilibrium constant. The reaction of glycerol with carbon dioxide is thermodynamically limited. High temperature and low pressure are favorable to the reaction of glycerol and urea. The deactivation of the alkali solid catalysts, calcium oxide, calcium hydroxide and calcium methoxide was investigated. When the catalysts were recycled, the yield of glycerol carbonate all decreased dramatically. The alkali solid catalyst was converted to the basic calcium carbonate Cax(OH)y(CO3)z, which was the cause for the decrease of glycerol carbonate yield. It was found that the chemical interactions of the alkali solid catalyst with glyceol and glycerol carbonate leaded to the formation of the basic calcium carbonate Cax(OH)y(CO3)z, for which the mechanism was proposed.There were dissolution losses of the catalysts in the reaction medium. A new method, coupling reaction and azeotropic distillation was proposed for the synthesis of glycerol carbonate (GC) from glycerol (G) and dimethyl carbonate (DMC). The high yield of glycerol carbonate can be obtained at a low molar ratio of dimethyl carbonate to glycerol with the method of coupling reaction and azetropic distillation. Glycerol carbonate yield can be as high as 98%. By continuously removing methanol from reaction system with the method of coupling reaction and azeotropic distillation, the yield of glycerol carbonate can be retained at high level using the recycled catalyst.
UR - http://www.scopus.com/inward/record.url?scp=80051866375&partnerID=8YFLogxK
M3 - Conference article
AN - SCOPUS:80051866375
SN - 0065-7727
JO - ACS National Meeting Book of Abstracts
JF - ACS National Meeting Book of Abstracts
T2 - 241st ACS National Meeting and Exposition
Y2 - 27 March 2011 through 31 March 2011
ER -