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Method for synthesizing high acid resistant MOR zeolite molecular sieve membrane from fluorine-containing dilute solution

A zeolite molecular sieve membrane and zeolite molecular sieve technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as not meeting the requirements of industrial applications, achieve reduced usage, broad application prospects, and save energy The effect of production costs

Inactive Publication Date: 2016-03-02
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for efficient utilization of chemistry while reducing manufacturing expenses compared with current methods such as ZSM-5 (zeolitics). It involves mixing certain liquids together at specific temperatures before reacting them under pressure. By adding fluoro ion into this mixture instead of just one type of salt like calcium hydroxide, we aimed towards improving the efficiency of separating alcohol from acetone by allowing small droplets containing these compounds to form larger ones called mesopores that allow gas flow through without getting stuck inside. Overall, our new method provides an improved way to separate ethanol from other substances efficiently.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the performance and cost effectiveness of acetate purifying processes such as those involving condensations between different compounds like ethylene glycol dimercaptoaccharide(MDA). Current techniques involve expensive materials and require significant amounts of resources due to their use. Therefore there exists a new method called ion exchange membrane process where nontoxic solvents can be utilized without adding any harmful substances during processing.

Method used

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  • Method for synthesizing high acid resistant MOR zeolite molecular sieve membrane from fluorine-containing dilute solution
  • Method for synthesizing high acid resistant MOR zeolite molecular sieve membrane from fluorine-containing dilute solution

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Prepare the MOR zeolite molecular sieve membrane as follows:

[0031] (1) Treatment of porous carrier tube: the porous carrier used in the synthesis of MOR zeolite molecular sieve membrane is α-Al 2 o 3 The carrier tube has an average pore diameter of 2-3 μm and a porosity of 30%-40%. α-Al 2 o 3 Before the crystal coating, the carrier tube was polished to a smooth surface with sandpaper, then ultrasonically cleaned with deionized water, and finally dried overnight in an oven at 80°C.

[0032] (2) Preparation of MOR zeolite molecular sieve seed liquid: Take 0.5g MOR zeolite molecular sieve (Shanghai Zhuohua) and add 100g deionized water to prepare a mass fraction of 0.5wt% MOR zeolite molecular sieve aqueous solution as the seed liquid, and ultrasonically stir the seed liquid After each 30min, the α-Al 2 o 3 The above-mentioned MOR zeolite molecular sieve was introduced into the carrier tube, dried at 80° C. for 8 hours, and then used as a seed tube for future use....

Embodiment 2

[0041] The same operation as in Example 1, except that the seed liquid concentration (MOR zeolite molecular sieve aqueous solution) is 0.2wt%, the pervaporation separation performance of the synthesized MOR zeolite molecular sieve membrane is slightly lower than that of Example 1, but the separation factor remains. Up to 10,000 or more. For dehydration of 90wt% acetic acid, at 75°C, the permeate flux is 0.64kg / m 2 h.

Embodiment 3

[0043] The same operation as in Example 1, except for α-Al 2 o 3 The pore diameter of the carrier tube is about 100 nm, and the pervaporation separation performance of the synthesized MOR zeolite molecular sieve membrane is better than that of Example 1. For dehydration of 90wt% acetic acid, at 75°C, the permeate flux is 0.92kg / m 2 h, the separation factor is as high as 10,000 or more.

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Abstract

The present invention discloses a novel method for synthesizing a high acid resistant MOR zeolite molecular sieve membrane from a fluoride-containing dilute solution. The MOR zeolite molecular sieve membrane synthesized by the method uses a fluoride-containing dilute solution as a synthetic liquid to reduce the usage amount of chemicals, save cost of growing, and eliminate the problem of easy gelling and caking in the traditional preparation process of MOR zeolite molecular sieve membrane synthesis liquid. In addition, fluorinion is added as a mineralizer into the synthesis liquid to effectively promote the growth of the crystal and optimize the skeleton structure of MOR zeolite molecular sieve. The synthesized MOR zeolite molecular sieve membrane can be used in high concentration 90wt% acetic acid / water separation, also shows potential application possibility in dehydration of organic solvent or acidic organic solvent, and has important broad application prospect.

Description

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Claims

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Application Information

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Owner DALIAN UNIV OF TECH
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