PROCESS FOR REDUCING THE CONTENT OF TEREPHTHALALDEHYDE ACID METHYL ESTER IN DIMETHYL TEREPHTHALATE

摘要

A process for reducing the content of methyl ester of terephthalaldehyde acid and its dimethyl acetal respectively in dimethyl terephthalate by transforming it into benzoic acid methyl ester, easily separable by distillation, and into dimethyl terephthalate, characterized in that crude dimethyl terephthalate is passed in the gas phase, in the presence of methanol and at elevated temperatures, on a solid palladium catalyst. (Machine-translation by Google Translate, not legally binding)