The present invention relates to a low temperature, solvent-free trans-acidolysis process for preparing surface-active carbohydrate fatty-acid esters comprising the steps of:
(e) reacting acylated carbohydrate with free fatty acid in the presence of acid catalyst, under reduced pressure, and without adding any solvent;
(f) decolorizing and separating the reaction mixture obtained in step (a) into unreacted fatty acid layer and a carbohydrate fatty-ester layer;
(g) precipitating out the unreacted acylated carbohydrate;
(h) librating the hydroxyl groups by partial hydrolysis in the presence of an acid catalyst;
(i) removing the unreacted free fatty acids and unreacted carbohydrate esters of low molecular-weight carboxylic acids during purification, and recycling the removed unreacted free fatty acids and carbohydrate esters to the starting reactant mixture.
本发明涉及一种低温、无溶剂的反式酸解作用过程,用于制备表面活性的
碳水化合物脂肪酸酯,包括以下步骤:
(e) 在酸催化剂的存在下,在减压条件下,不添加任何溶剂,将酰化
碳水化合物与游离
脂肪酸反应;
(f) 将步骤(a)中得到的反应混合物脱色并分离为未反应的
脂肪酸层和
碳水化合物脂肪酯层;
(g) 沉淀未反应的酰化
碳水化合物;
(h) 在酸催化剂的存在下通过部分
水解使羟基团脱离;
(i) 在纯化过程中去除未反应的游离
脂肪酸和低分子量
羧酸碳水化合物酯,并回收去除的未反应游离
脂肪酸和
碳水化合物酯到起始反应物混合物。