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A kind of ethanol solution pervaporation water separation molecular sieve membrane and preparation method thereof

A technology of pervaporation and ethanol solution, applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problems of poor stability, low dehydration efficiency, and low separation selectivity, and achieve stable membrane structure and high dehydration rate. , the effect of high separation selectivity

Active Publication Date: 2021-11-23
常州航爵医药科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MOR zeolite membrane has good stability in acetic acid aqueous solution, and shows high separation selectivity at low concentration of acetic acid (J.Membr.Sci., 2010,349,175-182), the properties of molecular sieve membrane layer structure directly determine Its separation performance and the applicable environmental conditions of the molecular sieve membrane, the pervaporation water separation performance of the MOR zeolite membrane under the condition of ethanol solvent containing a small amount of methanol or formaldehyde has the disadvantages of low dehydration efficiency, low separation selectivity and poor stability

Method used

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  • A kind of ethanol solution pervaporation water separation molecular sieve membrane and preparation method thereof
  • A kind of ethanol solution pervaporation water separation molecular sieve membrane and preparation method thereof
  • A kind of ethanol solution pervaporation water separation molecular sieve membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A molecular sieve membrane for ethanol solution pervaporation water separation. The molecular sieve membrane uses nano-sheet MOR molecular sieve as the matrix, and the MOR molecular sieve matrix is ​​coated on the surface of the alumina hollow fiber and synthesized by secondary crystallization. MOR molecular sieve membrane, after A molecular sieve membrane with selective opening of the eight-membered ring small channel for ethanol solution pervaporation water separation is obtained after post-treatment modification. Its preparation method concrete steps are as follows:

[0026] (1) Preparation of sheet-like MOR molecular sieve matrix

[0027] Weigh silicon source, aluminum source, sodium hydroxide, cetyltrimethylammonium bromide (CTAB) and deionized water respectively, wherein the amount of each material weighed by SiO 2 、Al 2 o 3 、Na 2 O, CTAB, H 2 The molar ratio in terms of O is SiO 2 :Al 2 o 3 : Na 2 O:CTAB:H 2 O=1:0.035:0.3:0.020:50, then dissolve the sil...

Embodiment 2

[0035] The tetraethyl orthosilicate in the step (1) of Example 1 was replaced by 30 wt% silica sol with an equimolar silicon content, and the rest of the synthesis conditions remained unchanged.

Embodiment 3

[0037] The pseudo-boehmite in step (1) of Example 1 was replaced with aluminum hydroxide in an equimolar amount, and the rest of the synthesis conditions remained unchanged.

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Abstract

The invention discloses a molecular sieve membrane for ethanol solution pervaporation water separation and a preparation method thereof, which is characterized in that the MOR molecular sieve with a nanosheet structure is used as a matrix, the molecular sieve membrane is synthesized by secondary crystallization, and the formed molecular sieve membrane is further After post-processing, the preparation method is as follows: firstly, the nano-sheet MOR seed crystal is synthesized by the organic template-free method; then the seed crystal is evenly coated on the surface of the alumina hollow fiber carrier; the secondary crystallization method is used to make the alumina hollow fiber carrier The crystallization of the molecular sieve film layer structure on the surface is completed without leaks; then, the MOR molecular sieve membrane with open eight-membered ring channels and selectively blocked twelve-membered ring channels is obtained by alkaline pyridine steam treatment. The pervaporation water separation process of impurity ethanol aqueous solution shows high dehydration efficiency, high separation selectivity and high membrane permeability.

Description

technical field [0001] The invention relates to a preparation method of a molecular sieve membrane, in particular to an ethanol solution pervaporation water separation molecular sieve membrane and a preparation method thereof. Background technique [0002] The solvent ethanol used in pharmaceutical and chemical industries often contains a small amount of organic impurities such as methanol or formaldehyde. Due to the azeotropy of ethanol and water in the refining process, the traditional azeotropic distillation method has high energy consumption, large equipment investment, and secondary pollution. shortcoming. As a kind of inorganic membrane, zeolite molecular membrane has the advantages of high temperature resistance, corrosion resistance and high mechanical strength. Because of its uniform structure characteristics and various molecular sieves that can be used to synthesize membranes, it is widely used in the field of solvent separation. . So far, there are MFI type (Sc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/36B01D69/12B01D71/02B01D67/00
CPCB01D61/362B01D67/0051B01D69/12B01D71/028B01D2325/023
Inventor 李桐庆
Owner 常州航爵医药科技有限公司