Preparation method of green feed additive gamma-aminobutyric acid

The invention aims at providing a preparation method of green feed additive gamma-aminobutyric acid. The preparation method has obvious advantages that reaction time is short, yield is high, cost is low, raw materials are easily available and operations are simple and safe and hereby is favorable for industrialized production. The preparation method mainly comprises the following steps of: preparing phthalimide potassium (3); preparing methyl-4-chlorobutyrate; preparing phthaloyl imino acid methyl butyrate (4); and preparing the gamma-aminobutyric acid. The gamma-aminobutyric acid prepared through the method has good effects of promoting animal ingestion, regulating incretion, improving immune performance and enhancing the anti-stress level of livestock and poultry and meets the requirement for resource-saving environmental-friendly sustainable stockbreeding development. Thus, the gamma-aminobutyric acid which can be used as a green feed additive has good application prospect in feed industry.