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Method for preparing CHA molecular sieve membrane in clean liquid

A technology of molecular sieve and clear liquid, which is applied in the direction of chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of unsuitable scale preparation, film thickness flux, environmental pollution, etc., to improve nucleation efficiency and reduce Generation of large particles, effect of increasing specific surface area

Inactive Publication Date: 2016-09-07
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, whether it is template or Sr 2+ ions, are expensive and easy to cause environmental pollution, not suitable for large-scale preparation
Alternatively prepared membranes are thicker and have lower flux

Method used

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  • Method for preparing CHA molecular sieve membrane in clean liquid
  • Method for preparing CHA molecular sieve membrane in clean liquid
  • Method for preparing CHA molecular sieve membrane in clean liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 1 g of ball-milled CHA molecular sieve seed crystals with a particle size of 0.10 μm into 1 L of deionized water, and sonicate for one hour to obtain a CHA seed crystal suspension, and immerse the polished mullite tubular support in the seed crystal suspension Take it out after 1 s, and dry it at 65°C for 2 h for later use. Use potassium hydroxide, aluminum hydroxide, silica sol and deionized water to configure the synthesis solution, and the molar ratio of the synthesis solution is: Al 2 o 3 :SiO2 2 :K 2 O:Na 2 O:H 2 O= 1 : 60 : 15 : 0 : 20000, pour the aged (ageing 0 h) synthetic solution into a PTFE-lined synthesis kettle, and put the seeded base film vertically into the synthetic solution, at 150 The hydrothermal synthesis was carried out at ℃ for 12 hours, and then the surface of the membrane was cleaned with absorbent cotton and deionized water, and the membrane was soaked in deionized water until the pH was 7. After drying, a tubular CHA molecular sieve ...

Embodiment 2

[0037] 5 g of ball-milled CHA molecular sieve seeds with a particle size of 0.5 μm were added to 1 L of deionized water, and the CHA seed crystals were suspended after ultrasonication for two hours. The crystal was coated on the surface of the hollow fiber carrier by vacuum suction method, where the vacuum degree was 10 kPa, the suction time was 1 s, and then dried at 65 °C for 2 h. Use potassium hydroxide, aluminum powder, silica sol and deionized water to configure the synthesis solution, and the molar ratio of the synthesis solution is: Al 2 o 3 :SiO2 2 :K 2 O:Na 2 O:H 2 O= 1 : 10 : 60 : 0 : 1000, pour the aged (aged 1 h) synthetic solution into a PTFE-lined synthesis kettle, and put the seeded base film vertically into the synthetic solution, at 160 The hydrothermal synthesis was carried out at ℃ for 6 h, the surface of the membrane was cleaned with absorbent cotton and deionized water, and then the membrane was soaked in deionized water until the pH was 7. After dryi...

Embodiment 3

[0039] 10 g of CHA molecular sieve seeds prepared by ball milling HY with a particle size of 0.50 μm were added to 1 L of deionized water, and a suspension of CHA seed crystals was obtained after ultrasonication for two hours. The crystal was coated on the surface of the hollow fiber carrier by vacuum suction method, where the vacuum degree was 5 kPa, the suction time was 20 s, and then dried at 65 °C for 2 h. Potassium hydroxide, sodium metaaluminate, sodium silicate and deionized water are used to prepare the synthetic liquid, and the molar ratio of the synthetic liquid is: Al 2 o 3 :SiO2 2 :K 2 O:Na 2 O:H 2 O= 1 : 30 : 20 : 1 : 4400, pour the aged (ageing for 10 h) synthetic liquid into a polytetrafluoro-lined synthetic kettle, and put the seeded base film vertically into the synthetic liquid, at 180 The hydrothermal synthesis was carried out at ℃ for 2 h, the surface of the membrane was cleaned with absorbent cotton and deionized water, the membrane was soaked in deio...

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Abstract

The invention provides a method for preparing a CHA molecular sieve membrane in a clean liquid, and particularly relates to synthesizing of the CHA molecular sieve membrane on the outer surface or the inner surface of a tubular hollow fiber or multiple channels. Without using a templating agent, the method regulates the molar ratio of components in a synthesis liquid and synthesizes the CHA molecular sieve membrane with high stability, high throughput and controllable morphology, and the synthesized membrane shows an excellent separation property. As no templating agent is used, the method is favorable for promotion of mass production of the CHA molecular sieve membrane.

Description

technical field [0001] The invention relates to a method and application for preparing a high-performance CHA molecular sieve membrane in clear liquid, in particular to a method for rapidly inducing and synthesizing a high-performance CHA molecular sieve membrane with controllable morphology under the condition of no template agent. Background technique [0002] Pervaporation technology is a new type of membrane separation technology and clean production technology. Due to its advantages of high separation efficiency, low energy consumption, and environmental protection, it has been favored by researchers and enterprises in recent years. This technology is especially suitable for near-boiling point, azeotropic mixtures and isomer systems that are difficult to separate or cannot be separated by rectification. It has obvious technical and economical advantages for the removal of trace water in organic solvents and organic mixed solvents. The advantages. At present, the molecu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00
CPCB01D67/0044B01D71/028
Inventor 顾学红蒋冀
Owner NANJING TECH UNIV
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