本发明中，D，涉及用于L-蛋氨酸的制备方法，在那个时候，二氧化碳，5-（2-甲基巯基乙基）被供给到由乙内酰脲的水解，粗蛋氨酸蛋氨酸获得钾水溶液 沉淀，将其分离和纯化，其中，用于纯化的目的，以产生分离的粗蛋氨酸的水溶液，和重结晶的方法，所述溶液以进行重结晶，钾离子 并且还包括结晶助剂，结晶添加剂，非离子表面活性或阴离子表面活性剂，或各种非离子表面活性剂或阴离子表面活性剂的混合物，和重结晶，60 用热甲硫氨酸溶液至110℃，通过引入的35温暖甲硫氨酸悬浮液进行80℃，甲硫氨酸悬浮液的温度比导入溶液的温度 它是低，并且在加入过程中，在35保持至80℃的甲硫氨酸悬浮液的温度。

The present invention, D, relates to a process for the preparation of L- methionine, at that time, carbon dioxide, 5- (2-methyl-mercaptoethyl) is supplied to methionine potassium aqueous solution obtained by hydrolysis of hydantoin, the crude methionine precipitated, which was separated and purified, where, for purposes of purification, to produce an aqueous solution of isolated crude methionine, and a method of recrystallization, the solution to carry out recrystallization, potassium ions and also include crystallization additives, crystallization additive, a nonionic surfactant or anionic surfactant, or a mixture of various non-ionic surface active agent or anionic surface active agent, and a recrystallization, 60 hot methionine solution with to 110 ° C., of performed by introducing the warm methionine suspension of 35 to 80 ° C., the temperature of the methionine suspension is lower than the temperature of the introduced solution, methionine suspension and maintains at 35 to 80 ° C. during the addition the temperature.