Method for separating and extracting 2,3-butanediol

A technology of butanediol and n-butanol, which is applied in the field of butanediol, can solve the problems of liquid-liquid immiscibility area and small operable range, large distribution coefficient, small comparison requirement and theoretical series, and achieve reduction Effects of energy consumption, efficiency improvement, and high recovery rate

Inactive Publication Date: 2010-06-16
EAST CHINA UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

[0014] An in-depth study of 2,3-butanediol-water-n-butanol ternary liquid-liquid phase equilibrium found that: when n-butanol is used as an extractant, the d...

Method used

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  • Method for separating and extracting 2,3-butanediol
  • Method for separating and extracting 2,3-butanediol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Get 1000g of feed liquid with 12.3% content of 2,3-butanediol, 750g of n-butanol, stir in the mixing tank for 30min, partly lead into the clarifier tank and let it stand for 30min, wait for standing to separate, and send the upper layer extract phase into the refining tank. The distillation tower, while the lower raffinate phase is pumped back to the mixing tank to continue the extraction. The reflux ratio refers to the ratio of the flow rate of the reflux liquid returned to the column from the top of the distillation column to the flow rate of the top product in the rectification operation. The reflux ratio of the rectification tower is selected to be 0.5-1.5, the temperature at the top of the tower is 93°C, and the distillate at the top of the tower is not subjected to phase separation, and all the distillate is pumped back to the mixing tank for further extraction. After a certain period of time, all the feed liquid in the mixing tank was introduced into the clarific...

Embodiment 2

[0037] The overall process is the same as that in Example 1. The 2,3-butanediol content is 9.2% feed liquid 1000g, n-butanol 750g, the selected reflux ratio is 0.5~1.5, after a period of extraction and rectification process, it is recorded that the clarification The mass concentration of 2,3-butanediol in the water phase of the tank was 1.67%, and the extraction cycle operation was stopped. The rectification is continued to separate n-butanol and water, and the content of 2,3-butanediol obtained in the tower reactor is 98.5%, and the extraction rate of 2,3-butanediol in this process can reach 75.32%. The 2,3-butanediol aqueous phase solution containing 1.67% returns to the membrane separation process, and the n-butanol phase is sent to the next extraction and rectification cycle operation, so the loss of 2,3-butanediol will not be caused.

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Abstract

The invention discloses a method for separating and extracting 2,3-butanediol. The method comprises the steps of: taking solution obtained by performing preliminary separation such as flocculation, filtration, membrane separation and the like on an 2,3-butanediol fermentation liquid as a raw material, taking normal butanol as an extraction solvent, and adopting an extraction and rectification coupling method to separate and purify the 2,3-butanediol. Through the extraction-rectification coupling process, the purity of the 2,3-butanediol in a product can reach over 98 percent, the single extraction rate can reach over 74 percent, and a raffinate can return to the membrane separation process of the fermentation liquid and is used for recovering the residual 2,3-butanediol. The method has the advantages that: the method adopts the extraction and rectification coupling method, realizes the characteristics of basically unchanged phase ratio and cycling extraction of the solvent so as to successfully solve the difficulties during the extraction of the 2,3-butanediol, realizes the separation process of extracting the 2,3-butanediol from a fermentation filtrate, and achieves the aims of reducing energy consumption and improving efficiency; and the process is simple and practical, has high recovery rate and good economy, and is suitable for industrialized production.

Description

【Technical field】 [0001] The invention relates to the technical field of butanediol, in particular to a method for separating and extracting 2,3-butanediol. 【Background technique】 [0002] 2,3-butanediol (2,3-BD for short), as a very potential C4 chemical, can be widely used in various fields such as chemical industry, food, fuel and aerospace. Its combustion value is 27198J / g, which is close to methanol (22081J / g) and ethanol (29005J / g). Fragrances, wetting agents, explosives and chiral carriers of drugs, etc. [0003] The production methods of 2,3-butanediol mainly include chemical method and microbial fermentation method. Due to the particularity of the structure of 2,3-butanediol, chemical production of 2,3-butanediol consumes a lot of raw materials, complex process routes, large construction investment, and serious environmental pollution; while biological production of 2,3-butanediol Alcohol meets the requirements of green chemical industry and sustainable developme...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/74
Inventor 朱家文吴艳阳沈亚领陈葵武斌纪利俊方江李琰君
Owner EAST CHINA UNIV OF SCI & TECH
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