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    • 5. 发明授权
    • Process for the recovery of S-(carboxymethyl)-(R)-cysteine and
S-(carboxymethyl)-(S)-cysteine
    • S-(羧甲基) - (R) - 半胱氨酸和S-(羧甲基) - (S) - 半胱氨酸的回收方法
    • US4551548A
    • 1985-11-05
    • US477514
    • 1983-03-21
    • Axel KleemannJurgen MartensHorst Weigel
    • Axel KleemannJurgen MartensHorst Weigel
    • C07B57/00C07B31/00C07C20060101C07C67/00C07C313/00C07C319/28C07C323/58C07C149/247
    • C07C319/28C07B2200/07C07B2200/13
    • The subject matter of the invention is a process for the recovery of S-(carboxymethyl)-(R)-cysteine and S-(carboxymethyl)-(S)-cysteine from a mixture of the two enantiomers. The mixture to be separated is dissolved in water in the presence of sufficient ammonia that the ammonium salt solution formed has a pH between 6 and 9. Then there is brought about in the solution of ammonium salt a state of supersaturation by the addition of seeding crystals of the ammonium salt of one of the two enantiomers, insofar as the starting material contains one of the two enantiomers in excess, the ammonium salt of this enantiomer, the ammonium salt of one of the two enantiomers is brought to crystallization and separated off. Subsequently by addition of seeding crystals of the ammonium salt of the other enantiomers to the remaining mother liquor the ammonium salt of this enantiomer is likewise brought to crystallization and separated off. Finally the respective S-(carboxymethyl)-cysteine is set free from the two ammonium salts.
    • 本发明的主题是从两种对映异构体的混合物中回收S-(羧甲基) - (R) - 半胱氨酸和S-(羧甲基) - (S) - 半胱氨酸)的方法。 待分离的混合物在足够的氨存在下溶解在水中,形成的铵盐溶液的pH值在6和9之间。然后在铵盐溶液中引入过饱和状态,加入晶种 的两种对映异构体之一的铵盐,只要起始原料含有过量的两种对映异构体之一,该对映异构体的铵盐,两种对映异构体之一的铵盐结晶并分离出来。 随后通过将其它对映异构体的铵盐的晶体晶体加入到剩余的母液中,同时将该对映异构体的铵盐进行结晶并分离。 最后,将各自的S-(羧甲基) - 半胱氨酸设定为不含这两种铵盐。