Zhejiang University

Jie Mao

Feng Cheng

Shuping Zou

The present invention discloses a method for preparing L-glufosinate ammonium powder. The method includes the following steps: (1) obtaining a transformation solution for performing biocatalytic transformation to prepare L-glufosinate ammonium, and filtering out bacteria to obtain a filtrate; (2) detecting the amount of ammonium sulfate in the filtrate obtained in step (1), adding calcium hydroxide or calcium oxide to react with the ammonium sulfate to produce calcium sulfate precipitates, and filtering out the calcium sulfate precipitates to obtain a filtrate; (3) detecting the amount of glufosinate ammonium in the filtrate obtained in step (2), adding zinc salt, adjusting pH to 5.5-6.8 to produce glufosinate ammonium zinc salt precipitates, and filtering and collecting the glufosinate ammonium zinc salt precipitates; (4) adding a solvent to dissolve the glufosinate ammonium zinc salt precipitates collected in step (3), and adjusting pH of a solution to 2-2.5 to produce L-glufosinate ammonium precipitates; and (5) recrystallizing the L-glufosinate ammonium precipitates obtained in step (4) to obtain purified L-glufosinate ammonium powder. The method provided by the present invention is simple to operate and low in cost, and has a better industrialization prospect.

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Hangzhou, China

Jie Mao