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Multistage porous ZSM-5 molecular sieve and preparation method thereof as well as method for preparing PX catalyst using same

A ZSM-5, molecular sieve technology, applied in the field of molecular sieve, can solve the problems of complex catalyst preparation process, little increase in toluene conversion rate, poor catalyst stability, etc., and achieve good catalytic effect, high selectivity and complete crystal form.

Active Publication Date: 2018-06-19
REZEL CATALYSTS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the catalyst is complex, involving the modification of noble metals such as Pt, the cost of the catalyst is high, and it is not easy to be industrialized
[0008] The above-mentioned patents respectively disclose catalysts for the preparation of p-xylene by alkylation of toluene with methanol, which have significantly improved the selectivity of p-xylene. Some patents have taken into account the improvement of toluene conversion rate, but the increase in toluene conversion rate is not much, and the catalyst is stable. Poor sex

Method used

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  • Multistage porous ZSM-5 molecular sieve and preparation method thereof as well as method for preparing PX catalyst using same
  • Multistage porous ZSM-5 molecular sieve and preparation method thereof as well as method for preparing PX catalyst using same
  • Multistage porous ZSM-5 molecular sieve and preparation method thereof as well as method for preparing PX catalyst using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]18.9g of sodium metaaluminate, 46.2g of sodium hydroxide, 63.5g of n-butylamine and 3737g of deionized water were stirred at 25°C for 0.5h to form a mixed solution A. Add 45g of isopropanol to 127.5g of polyether polyol with a molecular weight of 500-1000 (functionality: 2-3; hydroxyl value: 25-45; initiator: glycerin or ethylene glycol), and stir for 10 minutes to form a mixed solution b. Mixed solution B was dropped into mixed solution A, and stirred for 0.5h to form mixed solution C. 3404g of silica sol was slowly added to the mixed solution C, stirred for 0.5h, 30.6g of all-silicon seed crystals were added thereto, and stirred for 2h to form a mixed solution D. Add 3.1g of ammonium fluoride to the mixed solution D, and stir for 2 hours to form the mixed mother solution E. The mother liquor was transferred into a 10L stainless steel hydrothermal crystallization kettle, and the temperature was raised to 180° C. for 17 hours for crystallization. After crystallization...

Embodiment 2

[0045] Mix 216.2g of sodium carbonate, 58.1g of aluminum sulfate, 82.8g of tetrapropylammonium hydroxide and 3790g of deionized water and stir until they are completely dissolved, and stir for 1 hour to form a mixed solution A. Add 55.2 g of ethanol to 153 g of polyether polyol with a molecular weight of 400-600 (functionality: 2-3; hydroxyl value: 100-200; initiator: glycerin or ethylene glycol), and stir to form a mixed solution B. Add mixed solution B to mixed solution A, stir well to form mixed solution C. Add 1040g of white carbon black to the mixed liquid C, stir for 0.5h, add 41g of all-silicon seed, stir for 4h, and form the mixed liquid D. Add 7.1g of sodium fluoride to the mixed solution D, and stir for 2h to form the mixed mother solution E. The mother liquor E was transferred into a stainless steel hydrothermal crystallization kettle, and the temperature was raised to 190° C. for 15 hours after 7 hours. After the reaction, the product was washed with deionized wa...

Embodiment 3

[0047] 285.6g of sodium bicarbonate, 141.7g of aluminum isopropoxide, 85.9g of triethylamine and 2080g of deionized water were mixed and stirred until completely dissolved, and stirred for 2 hours to form a mixed solution A. Add 76.8g of methanol to 212.5g of polyether polyol with a molecular weight of 150-400 (functionality: 4-6; hydroxyl value: 350-450; initiator: sorbitol or pentaerythritol), heat to 40°C, and stir to form Mixture B. Add mixed solution B to mixed solution A, stir well to form mixed solution C. Add 5210g of water glass into the mixed solution C, then add 20.3g of all-silicon seed crystals, stir for 1 hour, and form the mixed solution D. Add 8.2g of ammonium carbonate to the mixed solution D, and stir for 4h to form the mixed mother solution E. The mother liquor E was transferred into a stainless steel hydrothermal crystallization kettle, and the temperature was raised to 170° C. for 24 hours after 4 hours. After the reaction, the product was washed with d...

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Abstract

The invention relates to a multistage porous ZSM-5 molecular sieve. The molecular sieve comprises the following raw materials: a silicon source, an aluminum source, a template agent, water, an alkalisource, polyether polyol, a seed crystal, a cosolvent and a mineralizer. The invention provides a preparation method of the multistage porous ZSM-5 molecular sieve with a high silicon-aluminum ratio.The synthesis process is simple, and cheap template agent and porous agent are adopted, so that the economic cost of the molecular sieve is reduced. The ZSM-5 molecular sieve obtained by the method has a multistage pore channel structure, the relative crystallinity is higher than 90%, and the specific surface area is greater than 420m<2> / g.

Description

technical field [0001] The invention belongs to the field of molecular sieves, and in particular relates to a multi-stage porous ZSM-5 molecular sieve, a preparation method thereof, and a method for preparing a PX catalyst. Background technique [0002] Paraxylene (PX) is mainly used to produce purified terephthalic acid (PTA), which is further synthesized to produce polyester fiber, which is an important chemical raw material for the polyester fiber industry. With the rapid development of the polyester industry, the demand for PX is also increasing rapidly. PX products are mainly obtained through petrochemical by-products. The output of PX is limited by the number of petrochemical installations and chemical process factors, and its output is obviously not high. Currently, nearly 50% of PX needs to be imported to meet the needs of the domestic market. Different from the petrochemical route, toluene-methanol alkylation to PX route uses cheap methanol produced in large quant...

Claims

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Application Information

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IPC IPC(8): C01B39/40B01J29/40C07C2/86C07C15/08
CPCB01J29/405B01J37/024B01J2229/18C01B39/40C01P2002/72C01P2004/03C01P2006/12C01P2006/17C07C2/864C07C2529/40C07C15/08Y02P20/52
Inventor 卓润生胡胜伟翟芳静宋迪燊
Owner REZEL CATALYSTS CORP
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