Process for preparing esters
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsMakoto Baba, Teruyuki Ninomiya, Chieko Ono
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Abstract
A process for preparing esters which comprises reacting a polycarboxylic acid with an alcohol, removing the unreacted alcohol from the resultant esterification reaction mixture, heating the crude ester at a temperature of 160.degree. to 340.degree. C., contacting the heat-treated crude ester with an adsorbent, and recovering the ester of high purity. The ester obtained has superior electrical insulation, transparency and thermal stability.
Claims11
A process for the production of esters which consists essentially of reacting a mixture of a polycarboxylic acid and an alcohol in the presence or absence of a catalyst which is insoluble in the mixture, distilling off unreacted alcohol from the esterification reaction mixture obtained to give a crude ester, heat-treating said crude ester at a temperature of 160.degree.-340.degree. C. for 0.1-3 hours, contacting said heat-treated ester with an adsorbent at a temperature of 30.degree.-150.degree. C. and then separating and recovering the desired ester from the crude ester.
A process for the production of esters which consists essentially of reacting a mixture of a polycarboxylic acid and an alcohol in the presence or absence of a catalyst which is insoluble in the mixture, distilling off unreacted alcohol from the esterification reaction mixture to give a crude ester, heat-treating said crude ester at a temperature of 160.degree.-340.degree. C. for 0.1-3 hours, then contacting said heat-treated ester with an adsorbent at a temperature of 30.degree.-150.degree. C., then separating and recovering the intended ester from the crude ester, thereby forming a residue, incinerating the residue to form ash, and reusing the ash thus obtained as adsorbent and/or esterification catalyst.
Dependencies are inferred from the claim text.