Process for the preparation of methionine
    32.
    发明授权
    Process for the preparation of methionine 有权
    制备甲硫氨酸的方法

    公开(公告)号:US09464045B2

    公开(公告)日:2016-10-11

    申请号:US14850207

    申请日:2015-09-10

    摘要: This disclosure relates to a process for preparing D,L-methionine by feeding carbon dioxide to an aqueous potassium methioninate solution obtained by hydrolysis of 5-(2-methylmercaptoethyl)hydantoin, in order to precipitate out crude methionine, which is separated off and purified. In this process an aqueous solution of the separated-off crude methionine is purified by recrystallization from a solution containing potassium ions and also a crystallization additive. The crystallization additive is a nonionic or anionic surfactant, or a mixture of different nonionic or anionic surfactants. The recrystallization occurs by introducing a 60 to 110° C.-hot methionine solution into a 35 to 80° C.-warm methionine suspension, a temperature of which is lower than that of the introduced solution, such that the temperature of the methionine suspension being maintained between 35 and 80° C. during the addition. The crystallization additive is a sorbitan fatty acid ester or a mixture of different sorbitan fatty acid esters.

    摘要翻译: 本公开涉及通过将二氧化碳供给到通过水解5-(2-甲基巯基乙基)乙内酰脲获得的甲硫氨酸钾水溶液以便沉淀出粗蛋氨酸的方法来制备D,L-甲硫氨酸,其分离和纯化 。 在该方法中,分离的粗甲硫氨酸的水溶液通过从含有钾离子的溶液和结晶添加剂中重结晶来纯化。 结晶添加剂是非离子或阴离子表面活性剂,或不同的非离子或阴离子表面活性剂的混合物。 通过将60〜110℃的甲硫氨酸溶液导入35〜80℃的甲硫氨酸悬浮液中,其温度低于引入的溶液的温度,使得甲硫氨酸悬浮液的温度 在添加期间保持在35和80℃之间。 结晶添加剂是脱水山梨糖醇脂肪酸酯或不同脱水山梨糖醇脂肪酸酯的混合物。