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Automatic device and method for preparing prior-alcohol-permeable composite membrane

A technology that preferentially penetrates alcohol and composite membranes. It is applied in the field of membrane separation. It can solve problems such as thick separation layers, surface defects, and unstable performance, and achieve the effects of thinner membrane surface thickness, simple technology, and rich materials.

Inactive Publication Date: 2012-10-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the traditional impregnation method is used to prepare the alcohol-preferred composite membrane, the thickness of the separation layer formed on the surface of the support is relatively thick, resulting in low permeation flux; and it is easy to form defects on the surface, resulting in unstable performance, which limits its industrial application

Method used

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  • Automatic device and method for preparing prior-alcohol-permeable composite membrane
  • Automatic device and method for preparing prior-alcohol-permeable composite membrane
  • Automatic device and method for preparing prior-alcohol-permeable composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The support body is polysulfone (PS) material, flat ultrafiltration membrane, the pure water flux is 300LMH / bar, and the membrane area is 92cm 2 , the polymer material used is polydimethylsiloxane (PDMS, viscosity is 20000), the crosslinking agent is tetraethyl orthosilicate (TEOS, molecular weight is 208), the catalyst is dibutyltin dilaurate (molecular weight is 631), the solvents for polydimethylsiloxane, ethyl orthosilicate and dibutyltin dilaurate are n-heptane.

[0063] (1) Use n-heptane to make polydimethylsiloxane into 2000ml of 1wt% solution, stir and ultrasonically defoam to make polymer solution; use n-heptane to make orthosilicate into 1wt% % solution 2000ml, add 0.015% dibutyltin dilaurate, stir and ultrasonic defoaming to prepare crosslinking agent solution;

[0064] (2) Fix the polysulfone base film on the non-woven surface of the loading tray, and adjust the low-speed motor speed to 100rpm;

[0065] (3) Put the polydimethylsiloxane solution in the pres...

Embodiment 2

[0078] The support body is polysulfone (PS) material, flat ultrafiltration membrane, the pure water flux is 300LMH / bar, and the membrane area is 92cm 2 , the polymer material used is polydimethylsiloxane (PDMS, viscosity is 20000), the crosslinking agent is tetraethyl orthosilicate (TEOS, molecular weight is 208), the catalyst is dibutyltin dilaurate (molecular weight is 631), the solvents for polydimethylsiloxane, ethyl orthosilicate and dibutyltin dilaurate are n-heptane.

[0079] (1) Use n-heptane to make polydimethylsiloxane into a 5wt% solution of 2000ml, stir and ultrasonically defoam to make a polymer solution; use n-heptane to make tetraethyl orthosilicate into 1wt% % solution 2000ml, add 0.015% dibutyltin dilaurate, stir and ultrasonic defoaming to prepare crosslinking agent solution;

[0080] (2) Fix the polysulfone base film on the non-woven surface of the loading tray and adjust the low-speed motor speed to 100rpm;

[0081](3) Put the polydimethylsiloxane solutio...

Embodiment 3

[0093] The support body is polysulfone (PS) material, flat ultrafiltration membrane, the pure water flux is 300LMH / bar, and the membrane area is 92cm 2 , the polymer material used is polydimethylsiloxane (PDMS, viscosity is 20000), the crosslinking agent is tetraethyl orthosilicate (TEOS, molecular weight is 208), the catalyst is dibutyltin dilaurate (molecular weight is 631), the solvents for polydimethylsiloxane, ethyl orthosilicate and dibutyltin dilaurate are n-heptane.

[0094] (1) Use n-heptane to make polydimethylsiloxane into 2000ml of 1wt% solution, stir and ultrasonically defoam to make polymer solution; use n-heptane to make orthosilicate into 1wt% % solution 2000ml, add 0.015% dibutyltin dilaurate, stir and ultrasonic defoaming to prepare crosslinking agent solution;

[0095] (2) Fix the polysulfone base film on the non-woven surface of the loading tray and adjust the low-speed motor speed to 100rpm;

[0096] (3) Put the polydimethylsiloxane solution in the press...

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Abstract

The invention provides an automatic device and a method for preparing a prior-alcohol-permeable composite membrane, belonging to the field of membrane separation technology. The automatic device for preparing the alcohol-permeation-prior composite membrane comprises a constant-temperature low-temperature drying oven, an air compressor, a filtering pressure-reducing valve, a three-way valve, an atomizing nozzle, an electromagnetic valve, a loading tray, a baking lamp, an electrical box, a motor, and a membrane loader; a macromolecular polymer solution is spayed on the surface of a porous support body; a cross-linker agent and a catalyst solution are sprayed to the surface of the membrane on the support body and react with the macromolecular polymer on the surface of the membrane by chemical crosslinking action to form the dense prior-alcohol-permeable composite membrane; a plurality of separation layers can form on the surface of the support body by alternative repetition of the above operations. The automatic device and the method provided by the invention automatically finishes spaying and crosslinking of a membrane casting solution with different components, effectively overcomes the problem of large thickness of the existing dipping composite membrane, greatly increases permeation flux and also improves the membrane forming stability.

Description

technical field [0001] The invention relates to an automatic device and method for preparing an alcohol-preferential composite membrane, belonging to the technical field of membrane separation. Background technique [0002] With the aggravation of the global energy crisis and environmental pollution, it is imperative to develop clean energy, and fuel ethanol as a biomass energy has attracted widespread attention. The traditional fermentation method can only produce 5%~10% ethanol dilute solution, and ethanol as a product has a strong inhibitory effect on the reaction, reducing the fermentation efficiency and yield. If the ethanol is removed from the fermentation broth in time, the fermentation efficiency will be improved, thereby increasing the production efficiency of ethanol. [0003] Pervaporation technology can remove ethanol from the fermentation broth in situ, which has the advantages of no pollution and low energy consumption. For low concentrations of ethanol, the ...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/68
Inventor 张国俊王任单玲珑唐海齐纪树兰
Owner BEIJING UNIV OF TECH
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