Application of hydrophilic Ge-ZSM-5 molecular sieve membrane to separation of organics/water system

A technology of ge-zsm-5 and organic matter, which is applied in the field of separation of organic matter/water system by hydrophilic molecular sieve membrane, can solve the problems of low separation efficiency, separation factor and permeation flux cannot be large enough at the same time, and achieve good separation Effect, large permeation flux, easy to operate

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

AI Technical Summary

Problems solved by technology

[0005] The specific technical problem to be solved in the present invention is the problem that the separation factor and the permeation flux cannot be large enough at the same time during the membrane separatio

Method used

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  • Application of hydrophilic Ge-ZSM-5 molecular sieve membrane to separation of organics/water system
  • Application of hydrophilic Ge-ZSM-5 molecular sieve membrane to separation of organics/water system
  • Application of hydrophilic Ge-ZSM-5 molecular sieve membrane to separation of organics/water system

Examples

Experimental program
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Effect test

Example Embodiment

[0016] Embodiment 1

[0017] Tetrapropylammonium hydroxide (TPAOH) with a mass fraction of 20% was added to a 100 mL three-necked flask containing deionized water and stirred vigorously at room temperature for 10 minutes. Silica sol (Ludox AS-40) was slowly added dropwise to the aforementioned sol, and tetraethoxy germanium (Ge(C 2 H 5 O) 4 After dissolving in isopropanol, slowly drip into the aforementioned colloid in an ice-water bath, and stir vigorously for about 20 minutes. Move the colloid into a water bath, raise the temperature to 80°C, stay at this temperature for about 10 minutes to remove the alcohol in the colloid, then remove the water bath to replenish the water lost during the evaporation process. Remove the water bath and continue to vigorously stir for 3 hours at room temperature for aging to obtain a milky white synthetic liquid. The molar composition of the synthetic fluid is 0.195 Ge(C 2 H 5 O) 4 : 19.5 SiO 2 : 1.0 TPAOH: 438 H 2 O. Combine synthetic fluid...

Example Embodiment

[0018] Embodiment 2

[0019] Applying the Ge-ZSM-5 molecular sieve membrane prepared in the first embodiment of the present invention, before conducting the pervaporation experiment, first pass a single-component permeation experiment to check the density of the molecular sieve membrane, and pass 0.3 MP on the front side of the membrane. H 2 , Test the gas pressure on the back side of the membrane, the pressure is 0.0 MP, it is considered that the membrane layer is relatively dense and has no defects.

[0020] Using 10-98 wt.% ethanol aqueous solution as the raw material liquid, the raw material liquid has a constant temperature of 353 K. The permeate side uses a vacuum pump to vacuum, condenses the permeate through the membrane with liquid nitrogen, takes a sample every hour, uses a GC-950 gas chromatograph to detect the change in the composition of the permeate, and weighs the quality of the permeate. Calculate separation factor and permeation flux, separation factor is ∞, perme...

Example Embodiment

[0021] Embodiment 3

[0022] The Ge-ZSM-5 molecular sieve membrane prepared in the first embodiment of the present invention is based on the second embodiment, and 30-98 wt.% acetic acid aqueous solution is used as the raw material liquid, and the raw material liquid has a constant temperature of 343 K. The permeate side uses a vacuum pump to vacuum, condenses the permeate through the membrane with liquid nitrogen, takes a sample every hour, uses a GC-950 gas chromatograph to detect the change in the composition of the permeate, and weighs the quality of the permeate. Calculate the separation factor and permeation flux. The separation factor is ∞, and the permeation flux reaches 0.57 kg / m 2 ·H, to achieve efficient separation. The pervaporation was carried out for 25 hours, and the separation factor and permeation flux were basically unchanged, indicating that the membrane layer has stable performance and good acid resistance. The results are listed in the attached figure 2 in...

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Abstract

The invention discloses an application of a hydrophilic Ge-ZSM-5 molecular sieve membrane to separation of an organics/water system. The alpha-Al2O3 is taken as a carrier, the hydrophilic Ge-ZSM-5 molecular sieve membrane prepared by an in-situ hydrothermal crystallization method is adopted as a separation material, and water in the organics/water system is separated through the pervaporation effect so as to obtain the organics. When the molecular sieve membrane is applied to an ethanol-water system of 343 K, 10 to 98 wt% and an acetic acid-water system of 353 K, 30 to 98 wt%, the separating factor reaches infinity, the permeation flux reaches 2.4 kg/m2.h and 0.57 kg/m2.h, both the permeation flux and the separating factor of the membrane are kept constant in the pervaporation process of 25 h, and the membrane shows excellent stability. The application is simple and easy to operate, and the hydrophilic Ge-ZSM-5 molecular sieve membrane is suitable for industrial production.

Description

technical field [0001] The invention relates to the application of a hydrophilic molecular sieve membrane in the separation of organic matter / water system, in particular to the separation factor of a hydrophilic molecular sieve membrane in the separation of organic matter / water system reaches ∞, and the permeation flux reaches the prior art About 1000 times the application. Background technique [0002] Organic matter is widely used in industry, such as acetic acid and ethanol, which are bulk chemical products and chemical raw materials. The traditional separation method of organic matter / water system is rectification method, but for the organic matter that forms near-boiling and azeotropic matter with water, using rectification method to separate high-concentration aqueous solution requires a large number of plates and high energy consumption . However, the use of hydrophilic membrane materials and separation through pervaporation can effectively reduce energy consumption...

Claims

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Application Information

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IPC IPC(8): C02F1/44B01D71/02B01D69/02
Inventor 王晓东黄伟邓旋
Owner TAIYUAN UNIV OF TECH
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