Mesoporous X-type molecular sieve, adsorbent based on molecular sieve, and preparation and application thereof

A molecular sieve and adsorbent technology, applied in the field of molecular sieve preparation and application, can solve the problems of low adsorption capacity, rate and desorption rate, and achieve the effects of high adsorption capacity, good adsorption selectivity, and increased transfer rate

Inactive Publication Date: 2015-04-01
SHANGHAI LVQIANG NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, there is an urgent need to develop a novel p-xylene adsorbent in this area to solve the problems of low adsorption capacity, rate and desorption rate.

Method used

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  • Mesoporous X-type molecular sieve, adsorbent based on molecular sieve, and preparation and application thereof
  • Mesoporous X-type molecular sieve, adsorbent based on molecular sieve, and preparation and application thereof
  • Mesoporous X-type molecular sieve, adsorbent based on molecular sieve, and preparation and application thereof

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preparation example Construction

[0038] A preparation method of mesoporous X-type molecular sieve, comprising the following steps:

[0039] a. Add the templating agent dropwise to the silicon source aqueous solution, and stir evenly at 25-35°C;

[0040] b. Add the solution obtained in step a dropwise to the aluminum source aqueous solution, and add a certain amount of sodium hydroxide solution so that the molar ratio thereof is SiO 2 : Al 2 o 3 :Na 2 O:H 2 O=(2.5~5): 1:(3~7.5):(180~300), the addition of template agent is 0.0001~5% of the total mass of the total reaction mixture, and continue stirring at 25~35°C to obtain a white gel ;

[0041] c. Transfer the white gel obtained in step b to the reactor for crystallization, the crystallization temperature is 80-180°C, preferably 100-150°C, the crystallization time is 24-120 hours, preferably 36-90 hours, and crystallize Then take it out and wash until the pH is 7-8. After drying, roast it at a temperature of 350-850°C, preferably 450-700°C. The roasting ...

Embodiment 1

[0055] Add 15 grams of aqueous solution of silane coupling agent (KH550) to 400 grams of water glass, add 150 grams of water, stir at 30°C until the solution is clear, and slowly add this clear solution dropwise to 250 grams of sodium metaaluminate solution (hydrogen Alumina was dissolved in sodium hydroxide solution), stirred at 30°C for 1 hour to obtain a white gel, which was transferred to a polytetrafluoroethylene-lined stainless steel reaction kettle, crystallized at 120°C for 72 hours, and the product was taken out. After cooling to room temperature, filter, take the solid product and wash it with deionized water until the pH is about 8, then dry it at 100°C, and roast the dried solid at 550°C for 4 hours to obtain the original powder ZA of mesoporous X-type molecular sieve. The particle size is 0.9-1.1 μm.

Embodiment 2

[0057] Add 20 grams of an aqueous solution of silane coupling agent (KH560) to 350 grams of silica sol solution, add 150 grams of water, stir at 35°C until the solution is clear, and slowly add it dropwise to 200 grams of sodium metaaluminate solution (to be (obtained by dissolving boehmite in sodium hydroxide solution), stirring at 30°C for 1 hour to obtain a white gel, which was transferred to a polytetrafluoroethylene-lined stainless steel reactor, crystallized at 150°C for 48 hours, and the product was taken out , after cooling to room temperature, filter, take the solid product and wash it with deionized water until the washing liquid is neutral, dry at 100°C, and roast the dried solid at 550°C for 4 hours to obtain the original powder of mesoporous X-type molecular sieve ZB, the particle size is 0.9-1.1 μm.

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Abstract

The invention relates to a preparation method of a mesoporous X-type molecular sieve and a method for preparing an adsorbent by using the molecular sieve as an active component. The prepared adsorbent based on the mesoporous X-type molecular sieve is used as a paraxylene adsorptive separation adsorbent. The method for preparing the mesoporous X-type molecular sieve comprises the following steps: by using water glass as a silicon source and aluminum hydroxide as an aluminum source, adding a template, and carrying out hydrothermal synthesis to obtain the mesoporous X-type molecular sieve. The mesoporous molecular sieve and kaolin are proportionally molded to obtain 0.3-0.8mm granules, and the granules are subjected to barium ion or (and) potassium ion exchange until the exchange degree is greater than 99%, thereby obtaining the adsorbent which has excellent adsorptive separation capacity for paraxylene in C8 aromatic hydrocarbons. Compared with the prior art, the active component mesoporous X-type molecular sieve of the adsorbent, which is prepared by using the template, has the crystal form structure of the X-type molecular sieve and the pore distribution of the mesoporous and microporous dual models; the mesoporous pore size distribution is 2nm or so; and thus, the problem of overlow mass transfer rate in the adsorbent can be solved.

Description

technical field [0001] The invention belongs to the field of molecular sieve preparation and application, and in particular relates to a mesoporous X-type molecular sieve, an adsorbent based on the molecular sieve and its preparation and application. Background technique [0002] P-xylene is an important organic chemical raw material, and high-purity p-xylene is the basic raw material for the polyester fiber industry. With the rapid development of the global polyester industry, the market demand for p-xylene has increased significantly. The industrial production of p-xylene generally adopts the simulated moving bed adsorption separation process for production. The p-xylene adsorption separation process is composed of adsorbents combined with simulated moving bed continuous countercurrent separation technology. The core is the development and application of high-efficiency adsorbents. [0003] U.S. Universal Oil (UOP) Company pointed out in the initial patent introduction tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/22B01J20/18B01J20/30
Inventor 周永贤李明霞王鹏飞何秋平张佳李豫晨朱琳
Owner SHANGHAI LVQIANG NEW MATERIALS CO LTD
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