Method for preparing threonine crystal by threonine fermentation liquid

Abstract

The invention relates to a method for preparing threonine crystal by threonine fermentation liquid, comprising the steps of: sterilizing the threonine fermentation liquid, and the carrying out plate-type or tube-type film ultrafiltration, concentration, azeotropic crystallization and other steps to prepare the threonine crystal; and the prepared threonine crystal has the purity of 98.5%, the threonine film ultrafiltration yield of more than 96%, and the azeotropic crystallization yield of more than 95%. The preparation method is an environment-friendly new production technique which has high efficiency, low energy consumption, low cost, simple method and easy popularization.

Description

technical field

[0001] The invention belongs to the technical field of amino acid separation and purification production, and in particular relates to a method for preparing threonine crystals from threonine fermentation broth. Background technique

[0002] Threonine is an essential amino acid for humans and animals, which can restore human fatigue and promote growth and development. However, the human body and animals cannot synthesize threonine by themselves, and must obtain it from external sources such as food. Therefore, threonine is widely used as a food fortifier, feed additive, pharmaceutical preparation, health care product, etc., with broad application prospects and strong market demand.

[0003] The production methods of threonine include protein hydrolysis, synthesis and direct fermentation. Direct fermentation is currently the main method for producing threonine, which has the advantages of low raw material cost and easy large-scale production. The traditiona...