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

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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-xy

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
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Example Embodiment

[0042] Example 1

[0043] 18.9 g of sodium metaaluminate, 46.2 g of sodium hydroxide, 63.5 g of n-butylamine and 3737 g of deionized water were stirred at 25° C. for 0.5 h 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; starter: glycerin or ethylene glycol), and stir for 10 minutes to form a mixed solution B. Drop the mixed liquid B into the mixed liquid A, stir for 0.5h to form the mixed liquid C. 3404g of silica sol was slowly added to mixed solution C, stirred for 0.5h, 30.6g of all-silicon seed crystals were added to it, and stirred for 2h to form mixed solution D. 3.1 g of ammonium fluoride was added to the mixed liquid D, and stirred for 2 hours to form a mixed mother liquid E. The mother liquor was transferred to a 10L stainless steel hydrothermal crystallization kettle, and the temperature was raised to 180°C for 17 hours for crystallization. After crystall...

Example Embodiment

[0044] Example 2

[0045] 216.2g of sodium carbonate, 58.1g of aluminum sulfate, 82.8g of tetrapropylammonium hydroxide and 3790g of deionized water are mixed and stirred until all are dissolved, and stirred 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; starter: glycerin or ethylene glycol), and stir to form mixed liquid B. Drop the mixed liquid B into the mixed liquid A and stir evenly to form the mixed liquid C. Add 1040g of white carbon black to mixed liquid C, stir for 0.5h, add 41g of all-silicon seed crystals, and stir for 4h to form mixed liquid D. 7.1 g of sodium fluoride was added to the mixed liquid D and stirred for 2 h to form a mixed mother liquid E. The mother liquor E was transferred to a stainless steel hydrothermal crystallization kettle, and the temperature was raised to 190°C for 7 hours to react for 15 hours. After the reaction, the p...

Example Embodiment

[0046] Example 3

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

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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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