Process of isolating methyl-4-formylbenzoate and dimethylterephtalate with high yield

摘要

Use as The present invention is the starting material, p- xylene (p-xylene) and from the reaction by-product in the manufacture of dimethyl terephthalate (DMT) by oxidation and esterification, the methyl-4-formyl benzoate (MFB) contained in the by-product alcohol and the acid to react, and then converted to acetal compound , followed by quenching of the acetal compound with an amine compound, first, remove the DMT, and then methyl 4-formyl benzoate and provides a method for separating a recovery yield.