Document Detail

Effect of pressure on the selectivity for the esterification of ethylene glycol with propionic acid in supercritical CO2.
MedLine Citation:
PMID:  17439276     Owner:  NLM     Status:  PubMed-not-MEDLINE    
The esterification of ethylene glycol with propionic acid was investigated in supercritical CO2 at 50.0 degrees C. The effect of pressure on equilibrium conversion and selectivity of ethylene glycol monopropionate (monoester) and ethylene glycol dipropinonate (diester) was studied systematically. It was shown that the equilibrium conversion and selectivity was nearly independent of pressure as pressure was lower than 9 MPa. At higher pressure, however, the yield and selectivity of the diester increased considerably, while those of the monoester decreased with increasing pressure. The main reason was that reactants and products distributed between the vapor phase and liquid phase at higher pressures. The solvent power of CO2 for the diester is stronger than that for the monoester. More diester molecules in the liquid phase were extracted into the vapor at higher pressures, which shifted equilibrium of the consecutive reversible reactions.
Jicheng Zhang; Tao Jiang; Buxing Han; Anlian Zhu; Xiumin Ma; Yinxi Zhou; Liang Bai; Hongwei Xiang; Yongwang Li
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Publication Detail:
Type:  Journal Article     Date:  2007-04-18
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  111     ISSN:  1520-6106     ISO Abbreviation:  J Phys Chem B     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-05-10     Completed Date:  2007-07-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5322-5     Citation Subset:  -    
Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China.
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