Preparation method of T-type molecular sieve/BTESE composite membrane

A molecular sieve and composite membrane technology, applied in the field of composite membranes, can solve the problems of low repeatability of preparation and affecting the commercial application of T-type molecular sieve membranes

Inactive Publication Date: 2020-10-23
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of preparing T-type molecular sieve zeolite membranes, it was found that even with the same formula, the separation performance of the prepared T-type molecular sieve membranes was still very different under the same crystallization conditions, and the problems caused by the low preparation repeatability would seriously affect T. Commercial application of type molecular sieve membrane

Method used

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  • Preparation method of T-type molecular sieve/BTESE composite membrane
  • Preparation method of T-type molecular sieve/BTESE composite membrane
  • Preparation method of T-type molecular sieve/BTESE composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Select high-quality α-Al with a length of 250mm, an outer diameter of 12mm, an average pore diameter of 2-3μm, and a porosity of 30-40%. 2 o 3 Carrier tube, put it into an ultrasonic cleaner for cleaning to obtain a clean and smooth carrier tube; seal both ends of the carrier tube with polytetrafluoroethylene plugs, and bake at 175°C for 3-4h;

[0034](2) The first hot dipping: Take 6g of industrial T molecular sieve coarse seeds with an average particle size of 1.6 μm and a silicon-aluminum molar ratio of 25 (purchased from Langfang Naco New Material Technology Co., Ltd.) and dissolve them in 500 mL of deionized water , sonicated for 1h to prepare a coarse seed solution; take out the carrier tube treated at 175°C, immerse in the coarse seed solution for 40s, remove the polytetrafluoroethylene plug at the mouth of the carrier tube, release the water immersed in the carrier tube, and put it at 75°C drying;

[0035] (3) Seal both ends of the carrier tube pre-coated ...

Embodiment 2

[0048] In this example, on the basis of Example 1, the content of hydrochloric acid in the BTESE solution is reduced, and a composite membrane of T-type molecular sieve and BTESE is prepared, and other raw materials and synthesis conditions are the same as in Example 1. The BTESE solution of described low hydrochloric acid content is prepared by following method: by following molar ratio BTESE:EtOH:H 2 O:HCl=1:28:300:0.05 Add BTESE to the mixture of ethanol and water, finally add a small amount of hydrochloric acid, add three times the volume of deionized water after stirring for two hours, and stir for three hours to obtain the BTESE solution, and then carry out The same follow-up operation as in Example 1, and performance evaluation of the finally synthesized BTESE / T composite membrane, the separation factor was as high as 12000.

Embodiment 3

[0050] This example uses the same synthetic raw materials, synthetic conditions and synthetic methods as in Example 1. After synthesizing a T-type molecular sieve and BTESE composite membrane, it is placed in a nitric acid solution with a pH of (5 ± 0.2) for 7 days, and then it is taken out and dried. A pervaporation experiment was carried out to test the separation performance of the composite membrane, and the separation factor was as high as 10,000.

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Abstract

The invention aims to provide a T-type molecular sieve/BTESE composite membrane with higher separation performance, high temperature resistance and acid resistance and a preparation method thereof. The preparation method of the T-shaped molecular sieve/BTESE composite membrane comprises the following concrete steps: 1) pretreating a carrier tube; 2) preparing a coarse seed crystal solution of a Tmolecular sieve and a fine seed crystal solution of the T molecular sieve to obtain a carrier tube into which coarse and fine seed crystals are introduced; 3) putting the carrier tube into which the coarse and fine seed crystals are introduced obtained in the step (2) into mother liquor for a crystallization reaction; and 4) preparing a BTESE solution, then dip-coating or wipe-coating the T-shapedmolecular sieve membrane obtained in the step (3) with the BTESE solution, and then carrying out baking to obtain the T-shaped molecular sieve/BTESE composite membrane.

Description

technical field [0001] The invention relates to the technical field of composite membranes, in particular to a T-type molecular sieve and BTESE composite membrane and a preparation method thereof. Background technique [0002] T-type molecular sieve is an artificial aluminosilicate crystal symbiotic with erionite and zeolite. The pore size is 0.52nm. The molar ratio of Si / Al in the framework is between 3 and 4. It belongs to the molecular sieve with a medium silicon-aluminum ratio. Strong acid resistance and hydrophilicity, the T-type molecular sieve membrane synthesized by T-type molecular sieve inherits this series of advantages, and has a wide range of applications. So far, T-type zeolite molecular sieve membrane is one of the most widely studied molecular sieve membranes in the application of inorganic membranes for organic solvent dehydration. Dehydration of organic matter and other weakly acidic environments, such as the production of alcohols such as ethanol and prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D71/02B01D71/06
CPCB01D67/0002B01D69/12B01D71/028B01D71/06
Inventor 李胜利周志辉吴红丹
Owner WUHAN UNIV OF SCI & TECH
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