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Method for recovering ethanol from ethanol/aqueous solution

A technology for recovering ethanol and aqueous solution, which is applied in chemical instruments and methods, separation/purification of hydroxyl compounds, total evaporation, etc. The effect of selective lifting

Active Publication Date: 2020-08-14
广西英和药业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polyvinylidene fluoride membrane is a common pervaporation preferential alcohol permeation membrane material, which has the advantages of relatively low price, easy film formation, stable chemical properties, good heat resistance, anti-pollution, and strong hydrophobicity. Potential pervaporation membrane materials, but in the application process, it is found that its flux and selectivity are difficult to meet the actual application requirements
[0004] In order to improve this situation, in the prior art, inorganic particles, such as zeolite, silica, MOF materials, etc., are blended with polymers to prepare hybrid membranes, which achieve a dual flux and selectivity within a certain range. increase, but not by much

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (a) Mix an appropriate amount of silica solid particles and silica mesoporous particles to obtain silica mixed particles, which are calcined at a high temperature at 200°C, wherein the silica solid particles and silica The mass ratio of silicon mesoporous particles is 3:1;

[0023] (b) Add the silica mixed particles in step (a) to the solvent n-hexane with a mass ratio of 15% of the silane coupling agent KH-560, and react for 2 hours under ultrasonic stirring to obtain the modified silica Silicon mixed particles;

[0024] (c) Evenly mix PVDF, modified silica inorganic particles, porogen polyethylene glycol and dimethylacetamide, age at 80°C for 12h, and stand at 100°C for defoaming Obtain the casting solution, wherein the mass ratio of PVDF, modified silica inorganic particles, porogen polyethylene glycol and dimethylacetamide in the casting solution is 10:3:2.5:100;

[0025] (d) Evenly scrape and coat the casting solution on the non-woven fabric, and place it in the ...

Embodiment 2

[0028] The preparation method of the membrane used in this example is consistent with that of Example 1. The test conditions are: when the operating temperature is 30°C and the ethanol concentration in the ethanol / water feed solution is 5wt%, the flux of the membrane is 10.2. The flux is 22.8 kg / m 2 h.

Embodiment 3

[0030] The preparation method of the membrane used in this example is consistent with that of Example 1. The test conditions are: when the operating temperature is 70°C and the concentration of ethanol in the ethanol / water feed solution is 15wt%, the flux of the membrane is 13.3. The flux is 32.8 kg / m 2 h.

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PUM

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Abstract

The invention provides a method for recovering ethanol from an ethanol / aqueous solution. The method is characterized in that the ethanol / aqueous solution is subjected to pervaporation separation through a SiO2 / PVDF hybrid membrane at 20-100 DEG C to recover ethanol; the SiO2 / PVDF hybrid membrane is prepared by mixing silicon dioxide solid particles and silicon dioxide mesoporous particles, carrying out hydrophobic modification by using a silane coupling agent and then adding the mixture into a PVDF membrane casting solution for phase inversion. According to the method, the flux and selectivityof recovering the ethanol from the ethanol / water solution by adopting the membrane material are improved to different extents.

Description

technical field [0001] The invention relates to a method for recovering ethanol from ethanol / water solution, in particular to a preparation method for improving the ethanol recovery effect by optimizing the membrane material preparation technology. Background technique [0002] As a green, efficient and renewable new energy source, bioethanol has been highly valued by countries all over the world. Due to product inhibition, the traditional fermentation process only obtains a dilute ethanol solution with an extremely low concentration, which needs to be removed from the fermentation broth in time. Among the existing ethanol dehydration technologies, pervaporation is a new type of membrane separation technology, which has the advantages of high efficiency, energy saving, and environmental protection. Alcohol-preferred pervaporation membrane and fermentation coupling technology have been adopted in the prior art, which can remove ethanol and butanol in the fermentation broth i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/76C07C31/08B01D61/36B01D67/00B01D71/34
CPCB01D61/362B01D67/0079B01D71/34C07C29/76C07C31/08
Inventor 穆效平
Owner 广西英和药业有限公司
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