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Method for separating and extracting 1,3-propylene glycol from fermentation liquor

A fermented liquid and propylene glycol technology, applied in the field of chemical engineering, can solve the problems of difficult desalination, low yield, high cost, etc., and achieve the effect of high separation yield, high purity, and short process

Inactive Publication Date: 2010-11-24
ZHANGJIAGANG HUAMEI BIO MATERIAL +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The object of the present invention is to provide a separation method for separating and extracting 1,3-propanediol from fermentation liquid, which has simple operation, low investment, low production cost and high yield, and overcomes the difficulties in desalting, high cost and high yield in the prior art. Disadvantages such as low rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The composition of the fermented liquid after removal of bacteria: 1,3-propanediol 70g / L, 2,3-butanediol 17.5g / L, glycerin 2g / L, soluble protein 0.5g / L, salt concentration 1.7%, pH 6.8 .

[0037] (1) 1000L / h of fermentation liquid, 250L / h left after concentrated by three-effect evaporation, concentrated 4 times.

[0038] (2) Add 170kg / h of glycerol to the fermented liquid concentrated in step (1).

[0039] (3) The material of step (2) enters rectifying tower 1 and carries out rectification under vacuum, and pressure 5kPa, reflux ratio 0.5 obtain cut 253kg / h from tower top, tower bottom cut 189.5kg / h.

[0040] (4) the overhead fraction of step (3) enters rectifying tower 2 and carries out rectification under vacuum, pressure 10kPa, reflux ratio 15, extract 2 from side line, 3-butanediol product 17.0kg / h, purity 99.8%; Tower 69.5 kg / h of 1,3-propanediol product was produced from the still, and after decolorization, 67.0 kg / h of 1,3-propanediol product was obtained with ...

Embodiment 2

[0043] The composition of the fermented liquid after removal of bacteria: 1,3-propanediol 58.5g / L, 2,3-butanediol 14.6g / L, glycerin 5g / L, soluble protein 0.7g / L, salt concentration 1.2%, pH6. 8.

[0044] (1) The fermented liquid is 2000L / h, after three-effect evaporation and concentration, 361L / h remains, which is 5.54 times concentrated.

[0045] (2) Add the glycerol of 192kg / h in the concentrated fermented liquid of step (1).

[0046] (3) The material of step (2) enters rectifying tower 1 and carries out rectification under vacuum, pressure 6kPa, reflux ratio 1.0, obtain cut 357.6kg / h from tower top, tower bottom cut 227.4kg / h.

[0047] (4) the overhead fraction of step (3) enters rectifying tower 2 and carries out rectification under vacuum, pressure 5kPa, reflux ratio 20, extract 2,3-butanediol product 28.1kg / h from side line, purity 99.92%; Tower 115kg / h of 1,3-propanediol product was produced from the still, and after decolorization, 112.5kg / h of 1,3-propanediol produc...

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Abstract

The invention relates to a method for separating and extracting 1,3-propylene glycol from fermentation liquor, which sequentially comprises the following steps: adding glycerin to the fermentation liquor from which thallus is removed (or to the concentrated fermentation liquor); and performing steps of evaporation, rectification and the like to separate and purify the 1,3-propylene glycol and a byproduct 2,3-butylene glycol from the fermentation liquor. The separation and extraction rate of the 1,3-propylene glycol is greater than 95%, the recovery rate of the glycerin is greater than 95%, and the salt in the fermentation liquor containing a little amount of glycerin is subjected to harmless treatment by burning. The purity of the 1,3-propylene glycol obtained by the technical scheme is greater than 99.5wt%. The separating and extracting process has the advantages of simplicity, short procedure, low cost and high purity and yield of the 1,3-propylene glycol obtained from separation.

Description

technical field [0001] The invention belongs to the field of chemical engineering, and relates to a method for separating and extracting 1,3-propanediol, in particular, to a method for extracting 1,3-propanediol from a fermentation liquid (obtained by microbial fermentation with glycerol as a substrate) using a concentration technique. Propylene Glycol method. Background technique [0002] 1,3-propanediol (1,3-PDO) is a basic chemical raw material with a wide range of uses, especially for the synthesis of polyester products PTT (polytrimethylene terephthalate) with excellent performance. [0003] So far, the method for preparing 1,3-propanediol is mainly divided into two categories: the one is the chemical synthesis method (such as ethylene oxide method and acrolein method, etc.), because the chemical synthesis method has harsh reaction conditions and side reactions Many and higher defects such as cost have limited the large-scale production and application of 1,3-propanedi...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/80
Inventor 韩冰方云进
Owner ZHANGJIAGANG HUAMEI BIO MATERIAL
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