Kettle-type continuous production method for glycine

Abstract

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.

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