Abrégé

Disclosed is a kettle-type continuous production method for glycine. The method includes: performing a hydantoin synthesis and hydrolysis reaction on glycolonitrile, ammonium carbonate, ammonium bicarbonate and water in a reactor with multiple serially connected kettles, and then purifying, concentrating, crystallizing, separating and drying the products to obtain refined glycine. The reactor with multiple serially connected kettles consists of a hydantoin synthesis section and a hydantoin hydrolysis section which are connected in sequence, the hydantoin synthesis section including a first reaction kettle group of reaction kettles with a reaction temperature of 80-100° C. and a second reaction kettle group of reaction kettles with a reaction temperature of 100-120° C., the first reaction kettle group or the second reaction kettle group consisting of one or more reaction kettles connected in series, the hydantoin hydrolysis section including a third reaction kettle group of reaction kettles with a reaction temperature of 130-150° C. and a fourth reaction kettle group of reaction kettles with a reaction temperature of 160-180° C., and the third reaction kettle group or the fourth reaction kettle group consisting of one or more reaction kettles connected in series.

Classes IPC  ?

• C07C 227/24 - Préparation de composés contenant des groupes amino et carboxyle liés au même squelette carboné à partir d'hydantoïnes
• C07C 227/40 - SéparationPurification

Abrégé

Disclosed is a kettle-type continuous production method for glycine. The method comprises: carrying out hydantoin synthesis and hydrolysis reaction on glycolonitrile and ammonium carbonate, ammonium bicarbonate and water in a reactor with multiple kettles in series, and then carrying out purification, concentration, crystallization, separation and drying to obtain refined glycine. The reactor with multiple kettles in series consists of a hydantoin synthesis section and a hydantoin hydrolysis section which are connected in sequence, wherein the hydantoin synthesis section comprises a first group of reaction kettles having a reaction temperature of 80-100ºC and a second group of reaction kettles having a reaction temperature of 100-120ºC, the first group of reaction kettles or the second group of reaction kettles respectively consisting of one or two or more reaction kettles connected in series; and the hydantoin hydrolysis section comprises a third group of reaction kettles having a reaction temperature of 130-150ºC and a fourth group of reaction kettles having a reaction temperature of 160-180ºC, the third group of reaction kettles or the fourth group of reaction kettles respectively consisting of one or two or more reaction kettles connected in series.

Classes IPC  ?

• C07C 227/24 - Préparation de composés contenant des groupes amino et carboxyle liés au même squelette carboné à partir d'hydantoïnes
• C07C 227/40 - SéparationPurification
• C07C 227/42 - Cristallisation
• C07C 229/08 - Composés contenant des groupes amino et carboxyle liés au même squelette carboné ayant des groupes amino et carboxyle liés à des atomes de carbone acycliques du même squelette carboné le squelette carboné étant acyclique et saturé ayant un seul groupe amino et un seul groupe carboxyle liés au squelette carboné l'atome d'azote du groupe amino étant lié de plus à des atomes d'hydrogène
• C07D 233/74 - Deux atomes d'oxygène, p. ex. hydantoïne avec uniquement des atomes d'hydrogène ou des radicaux ne contenant que des atomes d'hydrogène et de carbone, liés aux autres chaînons du cycle