A method for improving the stability of sapo-34 molecular sieve membrane in water vapor environment

A technology of SAPO-34 and molecular sieve, applied in chemical instruments and methods, membranes, membrane technology, etc., to achieve the effect of improving separation stability

Active Publication Date: 2019-02-19
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no public report on the grafting of SAPO-34 molecular sieve membranes to improve the gas performance of systems containing water vapor

Method used

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  • A method for improving the stability of sapo-34 molecular sieve membrane in water vapor environment
  • A method for improving the stability of sapo-34 molecular sieve membrane in water vapor environment
  • A method for improving the stability of sapo-34 molecular sieve membrane in water vapor environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1, the SAPO-34 molecular sieve membrane was placed in an oven and dried at 100 °C for 2 h.

[0027] Step 2, after mixing n-dodecyltrimethoxysilane and n-octane evenly at a volume ratio of 1:50, seal both ends of the film and put it into it. Specifically, use polytetrafluoroethylene tape to seal both ends of the film Seal it and fix it with a bracket to prevent the grafting solution from entering the cavity of the hollow fiber to block the pores of the support. Finally, put it into a stainless steel reactor for hydrothermal treatment and heat at 110 °C for 6 h.

[0028] Step 3, after the grafted membrane was washed with n-octane, it was dried in an oven at 150° C. for 10 h.

[0029] Such as figure 1 Shown is the surface contact angle test result of the grafted molecular sieve membrane. The contact angle test shows that the surface of the molecular sieve membrane is hydrophilic without grafting treatment. The contact angle test result of the grafted membrane surface...

Embodiment 2

[0031] Step 1, place the molecular sieve membrane in an oven and dry at 100 °C for 2 h.

[0032] Step 2: After mixing n-dodecyltrimethoxysilane and n-octane uniformly at a volume ratio of 1:83, seal both ends of the film and put it inside, and heat at 110 °C for 6 h.

[0033] Step 3: After the grafted membrane was washed with n-octane, it was dried in an oven at 80 °C for 10 h.

Embodiment 3

[0035] Step 1, place the molecular sieve membrane in an oven and dry at 100 °C for 2 h.

[0036] Step 2: After mixing n-dodecyltrimethoxysilane and n-octane uniformly at a volume ratio of 1:50, seal both ends of the film and put it inside, and heat at 110 °C for 6 h.

[0037]Step 3: After the grafted membrane was washed with n-octane, it was dried in an oven at 80 °C for 10 h.

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Abstract

The invention relates to a method for improving stability of a SAPO-34(Silicoaluminophosphate-34) zeolite membrane in a water vapor environment. A hydrophobic silane coupling agent is grafted on the surface of the zeolite membrane to improve the repellency of the zeolite membrane for water. Firstly, the membrane is dried, secondly, the membrane is placed in a grafting treatment solution to be grafted, and finally, the grafted membrane is cleaned and subjected to post treatment. The zeolite membrane grafted by the invention has separation selectivity under the water vapor-containing system, so as to be beneficial to improving the stability of the membrane in a water-containing system, and is simple and easy to react and operate.

Description

technical field [0001] The invention belongs to the field of inorganic membrane preparation, in particular to a method for improving the stability of a SAPO-34 molecular sieve membrane in a water vapor environment. Background technique [0002] Natural gas is an important fossil energy alongside coal and oil. It has the advantages of less pollution, large reserves, and low price. Therefore, its development and utilization have attracted more and more attention from various countries. The main component of natural gas is methane, the content is usually 75%~90%, in addition, it also contains other substances such as alkanes and olefins, water, carbon dioxide and hydrogen sulfide. These impurities will bring many hazards to transportation and deep processing, and their content needs to be strictly controlled before use. The purification treatment of natural gas is mainly to remove the CO 2 . Traditional treatment methods include solvent absorption and adsorption, but the abo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D67/00
CPCB01D67/0079B01D71/028B01D2323/04
Inventor 顾学红陈阳张春
Owner NANJING TECH UNIV
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