Process for the preparation of esters of dicarboxylic acids mono- - or by reaction of amides of carboxylic acids and alcohols, sulphuric acid or ammonium bisulfate

摘要

P & this invention relates to the preparation of esters of mono- - or dicarboxylic acids with aliphatic alcohols. For this preparation, the amide of a mono- - or dicarboxylic aliphatic or aromatic alcohol with a saturated or unsaturated aliphatic mono - or divalent and sulfuric acid and (or) of the ammonium bisulfate. It is used, for equivalent of amide 0,5 mole of sulfuric acid or one mole of ammonium bisulfate, so that it forms, in addition to the carboxylic acid ester, ammonium sulfate containing no bisulfate ammonium. / p & & p & this method makes it possible to make substantial savings of sulphuric acid with respect to the known processes, and also makes possible the use of ammonium bisulfate. / p