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Preparation method of H-ZSM-5 molecular sieve based catalyst and prepared catalyst

A technology of ZSM-5 and molecular sieve, which is applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low P/E ratio and low propylene yield, so as to improve P/E ratio, Effects of improving propylene selectivity and reducing environmental pollution

Inactive Publication Date: 2013-03-27
CHNA ENERGY INVESTMENT CORP LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of this, the present invention provides a method for preparing a H-ZSM-5 molecular sieve catalyst and the prepared catalyst to solve the problems of low propylene yield and low P / E ratio in the existing MTP technology

Method used

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  • Preparation method of H-ZSM-5 molecular sieve based catalyst and prepared catalyst
  • Preparation method of H-ZSM-5 molecular sieve based catalyst and prepared catalyst
  • Preparation method of H-ZSM-5 molecular sieve based catalyst and prepared catalyst

Examples

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Effect test

Embodiment 1

[0038] Tetraethyl silicate, sodium metaaluminate, tetrapropylammonium hydroxide, and deionized water are prepared into a gel mixture, and the weight ratio is: 98.4:0.24:0.12:1.24. The prepared mixture was heated to 70°C under normal pressure, kept at constant temperature for 10 hours, and then moved into a crystallization tank. Raise the temperature to 170°C and crystallize for 72 hours. Crystallization was then stopped by rapid cooling with ice water, and the mixture was removed from the kettle. The above mixture was washed with deionized water until the filter cake pH=9. Dry at 110°C for 12 hours, and bake at 540°C for 3 hours in an air atmosphere. At 90°C, exchange with 0.5 mol / L HCl solution twice for 2 hours each time. Washing, drying and calcining at 540° C. for 4 hours to obtain the H-ZSM-5 molecular sieve catalyst. Crystal phase analysis using X powder ray diffractometer (Japan Rigaku D / max-ra type ray diffractometer), tube voltage 40KV, tube current 30mA, CuK α R...

Embodiment 2

[0041] White carbon black, aluminum nitrate, tetrapropylammonium bromide, sodium hydroxide, and deionized water are prepared into a gel mixture, and the weight ratio is: 88.2:6.9:1.2:0.1:3.6. The prepared mixture was heated to 70°C under normal pressure, kept at constant temperature for 7 hours, and then moved into a crystallization kettle. Raise the temperature to 170°C and crystallize for 48 hours. Crystallization was then stopped by rapid cooling with ice water, and the mixture was removed from the kettle. The above mixture was washed with deionized water until the filter cake pH=8. Dry at 110°C for 12 hours, and bake at 540°C for 4 hours in an air atmosphere. At 90°C, exchange with 1 mol / L HCl solution twice for 2 hours each time. Washing, drying and calcining at 500° C. for 5 hours to obtain the H-ZSM-5 molecular sieve catalyst. X powder ray diffractometer analysis results show that its crystal structure is the same as ZSM-5 molecular sieve.

[0042] The catalyst eva...

Embodiment 3

[0044] Silicon dioxide, aluminum chloride, triethylamine, sodium hydroxide, and deionized water are prepared into a gel mixture, and the weight ratio is: 91.0:2.0:0.8:0.2:6.0. The prepared mixture was heated to 70°C under normal pressure, kept at constant temperature for 7 hours, and then moved into a crystallization kettle. Raise the temperature to 170°C and crystallize for 48 hours. Crystallization was then stopped by rapid cooling with ice water, and the mixture was removed from the kettle. The above mixture was washed with deionized water until the filter cake pH=8. Dry at 110°C for 12 hours, and bake at 540°C for 4 hours in an air atmosphere. At 90°C, exchange with 1 mol / L HCl solution twice for 2 hours each time. Washing, drying and calcining at 500° C. for 5 hours to obtain the H-ZSM-5 molecular sieve catalyst. X powder ray diffractometer analysis results show that its crystal structure is the same as ZSM-5 molecular sieve.

[0045] The catalyst evaluation method i...

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Abstract

The invention relates to a preparation method of an H-ZSM-5 molecular sieve based catalyst and a prepared catalyst; preheating is performed before sealed hydrothermal crystallization through hydro-thermal synthesis technology, which reduces the water content of a gel mixture, increases the solid content of the system, thus reaches the target of producing small crystal grains, and greatly improves the yield per single kettle of the molecular sieve; meanwhile the product separation process is avoided, which reduces the discharge of amine-containing waste water, and reduces environment pollution. With the catalyst of the present invention, the length of the product molecular diffusion path is shortened; the diffusion performance of the catalyst is improved; the secondary reaction of low carbon olefins is reduced; thus the propylene selectivity and P / E ratio are increased; and substances above C4 are ensured to be mainly olefins, and especially to be olefins with poor side chains.

Description

technical field [0001] The invention relates to the preparation of the catalyst, in particular to the preparation method of the H-ZSM-5 molecular sieve catalyst and the prepared catalyst. Background technique [0002] The methanol conversion project began in the 1970s and has gone through three stages: methanol conversion to gasoline (MTG), methanol conversion to light olefins (MTO) and methanol conversion to propylene (MTP). Although no less than 20 chemical mechanisms for methanol conversion have been proposed so far, it is generally accepted that the conversion of methanol is a continuous reaction process, that is, methanol (including dimethyl ether and the water vapor mixture of the two) is first converted to form Primary products including ethylene, propylene and butenes that undergo secondary reactions to higher products including higher olefins, alkanes and aromatics [0003] MTG and MTO are two extremes in the pursuit of methanol conversion. Therefore, through simpl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C11/06C07C1/20
CPCY02P20/52
Inventor 王俭温鹏宇窦涛张堃吉向飞郭兆明宋岩巩雁军张卿
Owner CHNA ENERGY INVESTMENT CORP LTD
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