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A kind of processing method of molecular sieve membrane

A treatment method and molecular sieve technology, applied in the field of membrane separation, can solve problems such as the reduction of permeation flux

Active Publication Date: 2021-11-23
HYMATER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods usually lead to a decrease in the permeate flux

Method used

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  • A kind of processing method of molecular sieve membrane
  • A kind of processing method of molecular sieve membrane
  • A kind of processing method of molecular sieve membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A type molecular sieve membrane I was synthesized by the seed crystal method (CN1467017A Example 1). Soak the synthesized molecular sieve membrane in an aqueous solution of NaOH, the pH of the solution is 10, and the soaking time is 30 minutes. After soaking, wash with water until neutral.

[0031] The pervaporation test was used to compare the separation performance of the molecular sieve membranes before and after treatment. The process is as follows:

[0032] a) Prepare an aqueous ethanol solution containing 90% ethanol, and seal the molecular sieve membrane in a stainless steel membrane module with a silicone rubber sealing ring, and effectively separate the area A according to the exposed area.

[0033] b) Adjust the constant temperature water bath and heater to keep the system at a constant temperature of 50°C.

[0034] c) The raw material liquid is transported to the raw material side of the membrane module through the magnetic circulation pump, and the flow r...

Embodiment 2

[0040] A type molecular sieve membrane II was synthesized by microwave synthesis (CN100337918C Example 3). The synthesized molecular sieve membrane was soaked in NaOH aqueous solution, the pH of the solution was 8, and the soaking time was 30 minutes. After soaking, wash with water until neutral.

[0041] The pervaporation test was used to compare the separation performance of the molecular sieve membranes before and after treatment. Pervaporation operation process is as embodiment 1, and above-mentioned test result is as shown in table 2:

[0042] Table 2

[0043] Molecular sieve membrane Osmotic flux separation factor Untreated molecular sieve membrane II 0.60kg / m 2 h

Embodiment 3

[0045] Using mesoporous zeolite crystals to synthesize NaA molecular sieve membrane III (CN104941451A Example 1), the synthesized molecular sieve membrane was soaked in NaOH aqueous solution, the pH of the solution was 9, and the soaking time was 30 minutes. After soaking, wash with water until neutral.

[0046] The pervaporation test was used to compare the separation performance of the molecular sieve membranes before and after treatment. The pervaporation operation process is as in embodiment 1, and the test results are as shown in table 3:

[0047] table 3

[0048] Molecular sieve membrane Osmotic flux separation factor Untreated molecular sieve membrane III 0.60kg / m 2 h

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Abstract

The invention discloses a treatment method for molecular sieves. The method includes the step of contacting the molecular sieve with an alkaline solution. Through a simple alkali treatment method, the permeation flux of the molecular sieve membrane can be improved, and in some cases, the permeation flux and separation selectivity of the molecular sieve membrane can even be improved at the same time. On the other hand, the technical means adopted in this method are simple, easy to implement, low in cost, and easy to realize industrial application. And it can be easily connected with the existing production process, which is conducive to the upgrading and transformation of products by production enterprises and increases market competitiveness.

Description

technical field [0001] The invention belongs to the field of membrane separation technology, in particular to the field of molecular sieve membranes, and relates to the performance improvement technology of molecular sieve membranes. Background technique [0002] Molecular sieve membrane is a new type of inorganic separation membrane material, which has the advantages of good stability and high separation performance, and has been widely used in the fields of pervaporation and steam permeation. Two important indicators to characterize the separation performance of molecular sieve membranes are permeation flux and separation selectivity. Usually, by optimizing the synthesis conditions, molecular sieve membranes with ideal permeation flux and selectivity can be obtained, but in most cases it is difficult to achieve simultaneous optimization of both. [0003] The performance of molecular sieve membrane can be improved by post-treatment method. For example, chemical liquid dep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/10B01D71/02G01N15/08
CPCB01D65/10B01D71/028G01N15/08G01N2015/084
Inventor 李砚硕
Owner HYMATER CO LTD