PROCESS FOR THE PREPARATION OF D,L-METHIONINE

The invention relates to a single cycle process for preparing D,L-methionine from an alkali methioninate solution obtained by alkaline hydrolysis of 5-(2-methylmercaptoethyl)hydantoin, in which the D,L-methionine is obtained by neutralizing the alkali methioninate solution with carbon dioxide at elevated temperature and subsequently crystallizing D,L-methionine in the presence of seed crystals. 本发明涉及一种用于由通过5-(2-甲硫基乙基)乙内酰脲的碱性水解得到的甲硫氨酸碱金属盐溶液制备D,L-甲硫氨酸的单循环方法，其中所述D,L-甲硫氨酸通过在升高的温度下用二氧化碳中和甲硫氨酸碱金属盐溶液并随后在晶种存在下使D,L-甲硫氨酸结晶来得到。