A process for the preparation of methylsuccinic acid in any form, including its salts, its mono- and diester derivatives and the anhydride thereof, which comprises reacting citric acid or a derivative thereof in decarboxylation conditions, said process comprising (i) reacting citric acid or mono- and diester derivatives thereof in a non- aqueous solvent, specifically excluding alcohols, on a metallic catalyst at a temperature between 50 to 400°C and under a partial hydrogen pressure from 0.1 to 50 bar or (ii) reacting citric acid or any salt thereof or mono-, di- and triester derivatives thereof on a metallic catalyst in solvents comprising at least 5% water, at a temperature of from 50 to 400°C under a hydrogen partial pressure from 0.1 to 400 bar
一种制备
甲基琥珀酸及其盐、单
酯和二
酯衍
生物以及其酐的方法,包括在
脱羧条件下反应
柠檬酸或其衍
生物,所述方法包括(i) 在非
水溶剂中在
金属
催化剂上以50至400°C的温度和0.1至50巴的部分
氢压力下反应
柠檬酸或其单
酯和二
酯衍
生物,特别排除醇;或(ii) 在含
水量至少为5%的溶剂中,在50至400°C的温度下,在0.1至400巴的
氢分压下反应
柠檬酸或其任何盐或其单
酯、二
酯和三
酯衍
生物上。