Method for separating 2,3-butanediol

Abstract

The invention discloses a method for separating 2,3-butanediol. The method comprises the following steps: (1) carrying out pretreatment on fermentation broth, so as to obtain clear fermentation broth; (2) adding an inorganic salt and / or an organic acid salt into the clear fermentation broth, carrying out thorough mixing, then, adding a low-polarity organic substance into the clear fermentation broth, carrying out thorough mixing, and then, carrying out standing layering, so as to obtain an upper phase, i.e., a 2,3-butanediol organic solution and a lower phase, i.e., a salt solution; and (3) carrying out electrodialysis desalination treatment on the upper phase, i.e., the 2,3-butanediol organic solution, and collecting a clear solution and concentrated liquor I; and carrying out electrodialysis desalination treatment on the lower phase, i.e., the salt solution by taking the concentrated liquor I as electrodialysis concentrated liquor circulating liquid, collecting and recycling concentrated liquor II, and distilling the clear solution, thereby obtaining the 2,3-butanediol product. According to the method, biomacromolecules such as thallus dissolved protein and lipids can be effectively removed from the fermentation broth so as to form a relatively uniform and pure liquid-phase system, and the implementation of next-step refining manners such as double-aqueous-phase and rectifying is facilitated, so that the method is applicable to large-scale production application.

Description

technical field [0001] The invention belongs to the field of biochemical industry, in particular to a method for separating 2,3-butanediol from fermentation liquid. Background technique [0002] 2,3-Butanediol is a potential bulk chemical. As an important chemical raw material and liquid fuel, it can be widely used in chemical industry, food, fuel, aerospace and other fields. The combustion value of 2,3-butanediol is comparable to that of ethanol and methanol. It is one of the potential liquid fuels and can also be used as a fuel additive. The dehydration product of 2,3-butanediol, methyl ethyl ketone, is also an important chemical raw material, widely used in industries such as fuel, paint, binder, lubricant, and ink. 2,3-butanediol is also used as a flavor additive, which can be added to liquor in an appropriate amount to make the taste mellow; diacetyl obtained by catalytic dehydrogenation is a high-value food additive; acetoin (3- Hydroxy-2-butanone, Acetoin) is a natu...

AI Technical Summary

Problems solved by technology

The comprehensive application of water phase separation and extraction separation technology is beneficial to improve the separation effect of 2,3-butanediol, but in the process, a large amount of inorganic salts will be added to reduce the hydrophilicity of 2,3-butanediol

A large amount of inorganic salts introduced in the two-phase aqueous phase process, a small amount of inorganic salts will remain in the 2,3-butanediol organic extract, affecting its further purification, most of which will exist in the water phase, increasing production costs, and pollute the environment

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