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Application and preparation method of zeolite molecular sieve

A zeolite molecular sieve and molecular sieve technology, applied in separation methods, molecular sieves and alkali exchange compounds, chemical instruments and methods, etc., can solve the problems of high loss, high equipment corrosion rate of corrosive amine solution, difficulty in obtaining high purity, etc. selective effect

Active Publication Date: 2017-12-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Process disadvantages of conventional amine treatment methods include: (1) the large amount of energy required for amine regeneration; (2) the relatively low CO 2 Load capacity requires high solvent circulation rate and large diameter high-pressure absorption tower; (3) corrosive amine solution easily causes high equipment corrosion rate; (4) amine easily degrades to form organic acid
However, the membrane separation method also has its inevitable shortcomings, such as CH 4 More losses, difficult to obtain high-purity CH 4 , and the cost of the membrane is relatively expensive and easily polluted

Method used

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  • Application and preparation method of zeolite molecular sieve
  • Application and preparation method of zeolite molecular sieve
  • Application and preparation method of zeolite molecular sieve

Examples

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Effect test

Embodiment 1

[0033] A preparation method of zeolite molecular sieve, comprising the steps of:

[0034] 1-1) Heat a mixture of 40mL of distilled water, 14g of potassium hydroxide and 8g of aluminum hydroxide until the solution becomes clear and transparent (keep the amount of distilled water at 40mL), cool at room temperature for later use to obtain potassium metaaluminate solution.

[0035] 1-2) Mix potassium metaaluminate solution and CsOH solution, then add silica sol, stir for 10 minutes until the mixture solution is uniform, and the molar ratio of raw materials is 2.4K 2 O:0.06Cs 2 O:4.0SiO 2 : Al 2 o 3 :36H 2 O.

[0036] 1-3) Then transfer the mixture into a 23mL polytetrafluoroethylene-lined autoclave, and react at 423K for 4 days. After the crystallization is completed, wash with distilled water, filter, and dry at 373K to obtain a white powder. The obtained sample was characterized by XRD to obtain ZK-5. The silicon-aluminum ratio was measured to be 3.21 by elemental analysi...

Embodiment 2

[0039] A preparation method of zeolite molecular sieve, comprising the steps of:

[0040] 1-1) Heat a mixture of 40mL of distilled water, 14g of potassium hydroxide and 8g of aluminum hydroxide until the solution becomes clear and transparent (keep the amount of distilled water at 40mL), cool at room temperature for later use to obtain potassium metaaluminate solution.

[0041] 1-2) Mix potassium metaaluminate solution and CsOH solution, then add silica sol, stir for 10 minutes until the mixture solution is uniform, and the molar ratio of raw materials is 2.4K 2 O:0.06Cs 2 O:4.26SiO 2 : Al 2 o 3 :36H 2 O.

[0042] 1-3) Then transfer the mixture into a 23mL polytetrafluoroethylene-lined autoclave, and react at 423K for 4 days. After the crystallization is completed, wash with distilled water, filter, and dry at 373K to obtain a white powder. The obtained sample was characterized by XRD to obtain ZK-5. The silicon-aluminum ratio was measured to be 3.30 by elemental analys...

Embodiment 3

[0048] A preparation method of zeolite molecular sieve, comprising the steps of:

[0049] 1-1) Heat a mixture of 40mL of distilled water, 14g of potassium hydroxide and 8g of aluminum hydroxide until the solution becomes clear and transparent (keep the amount of distilled water at 40mL), cool at room temperature for later use to obtain potassium metaaluminate solution.

[0050] 1-2) Mix potassium metaaluminate solution and CsOH solution, then add silica sol, stir for 10 minutes until the mixture solution is uniform, and the molar ratio of raw materials is 2.4K 2 O:0.06Cs 2 O:4.1SiO 2 : Al 2 o 3 :36H 2 O.

[0051] 1-3) Then transfer the mixture into a 23mL polytetrafluoroethylene-lined autoclave, and react at 423K for 4 days. After the crystallization is completed, wash with distilled water, filter, and dry at 373K to obtain a white powder. The obtained sample was characterized by XRD to obtain ZK-5. The silicon-aluminum ratio was measured to be 3.24 by elemental analysi...

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Abstract

The invention belongs to the technical field of separation materials, relates to a preparation method of a zeolite molecular sieve and particularly relates to a gas separation material with a 'molecular gate' effect on CH4 and CO2. The separation material can be widely applied to separation and recovery of CO2 in natural gas. The preparation method includes: adjusting a silicon-aluminum ratio, and adopting a raw material mole ratio of SiO2 / Al2O3 being 4.0-4.26 to obtain a ZK-5 molecular sieve; adding the molecular sieve into potassium salt solution, and heating and stirring for ion exchange while continuously adding distilled water in a heating process to keep the total quantity of the solution unchanged; after ion exchange, adopting deionized water for washing and filtering, and drying to obtain the K-ZK-5 zeolite molecular sieve. Due to changing of the silicon-aluminum ratio and K<+> introduction, the molecular sieve shows the 'molecular gate' effect, namely the molecular sieve only adsorbs CO2 small in kinetic diameter and is extremely low in adsorption quantity of large gas molecules such as CH4 and N2.

Description

technical field [0001] The invention belongs to the technical field of separation materials, and in particular relates to a preparation method of a zeolite molecular sieve. More specifically, a pair of CH 4 and CO 2 A gas separation material with a "molecular gate" effect, which can be widely used in CO in natural gas 2 separation and recycling. Background technique [0002] Natural gas is a CH 4 Gas-based high-quality, efficient and clean low-carbon energy can be divided into conventional natural gas and unconventional natural gas. At present, conventional natural gas has been widely used in various fields of production and life, and its demand is increasing day by day. In addition, sub-quality natural gas reserves (including sour natural gas reserves) are widely distributed and abundant. Sub-quality natural gas reserves are defined as containing greater than 2% CO 2 , 4% N 2 and 4 ppm hydrogen sulfide (H 2 S) gas fields. It is estimated that more than half of nat...

Claims

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Application Information

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IPC IPC(8): C01B39/02B01D53/02C10L3/10
CPCB01D53/02B01D2253/108B01D2256/22B01D2257/504C01B39/02C01B39/026C01P2002/72C01P2006/12C10L3/104Y02C20/40Y02P20/151
Inventor 杨江峰刘佳奇尚华杨成荫李晋平
Owner TAIYUAN UNIV OF TECH
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