申请人:Nippon Shokubai Kagaku Kogyo Co., Ltd.
公开号:US04916233A1
公开(公告)日:1990-04-10
4-Methyl-5-[(2-aminoethyl)-thiomethyl]-imidazole can be effectively produced by causing 4-methylimidazole or a salt thereof to react with at least one member selected from the group consisting of (a) a formaldehyde adduct of cysteamine, (b) 2-aminoethanethiol sulfuric acid and formaldehyde or a formaldehyde oligomer, and (c) thiazolidine or a salt thereof, in the presence of a mineral acid, removing a portion of reaction liquid out of the reaction system while maintaining molar concentration of 4-methyl-5-[(2-aminoethyl)-thiomethyl]-imidazole in the reaction system not exceeding 70 mol % based on total mol numbers of 4-methylimidazole and 4-methyl-5-[(2-aminoethyl)-thiomethyl]-imidazole, then separating a liquid containing 4-methyl-5-[(2-aminoethyl)-thiomethyl]-imidazole from the removed portion of reaction liquid, and recycling the remainder into the reaction system.
4-甲基-5-[(2-氨基乙基)-硫甲基]-咪唑可以通过在矿酸存在下,使4-甲基咪唑或其盐与以下至少一种成员反应而有效地生产:(a)半胱氨酸醛缩物,(b)2-氨基乙硫酸和甲醛或甲醛寡聚物,(c)噻唑烷或其盐。在保持反应体系中4-甲基-5-[(2-氨基乙基)-硫甲基]-咪唑的摩尔浓度不超过4-甲基咪唑和4-甲基-5-[(2-氨基乙基)-硫甲基]-咪唑的总摩尔数的70摩尔%的情况下,将一部分反应液体从反应系统中取出,然后将含有4-甲基-5-[(2-氨基乙基)-硫甲基]-咪唑的液体与取出的反应液体分离,并将其余部分循环回反应系统。