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A method of synthesizing a mesoporous MCM-22 molecular sieve and uses of the molecular sieve

A molecular sieve and mesoporous technology, applied in molecular sieve catalysts, chemical instruments and methods, hydrocarbons, etc., can solve problems such as unfavorable industrial production, cumbersome operation steps, etc., to improve production efficiency, good technical effects, and increase the amount of ethylene. Effect

Inactive Publication Date: 2016-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is that the synthesis method of mesoporous MCM-22 molecular sieve in the prior art has complicated operation steps and is not conducive to industrial production. A new synthesis method of mesoporous MCM-22 molecular sieve is provided

Method used

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  • A method of synthesizing a mesoporous MCM-22 molecular sieve and uses of the molecular sieve
  • A method of synthesizing a mesoporous MCM-22 molecular sieve and uses of the molecular sieve
  • A method of synthesizing a mesoporous MCM-22 molecular sieve and uses of the molecular sieve

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 22 g Al 2 (SO 4 ) 3 18H 2 O is dissolved in 365 grams of water, adding 12 grams of sodium hydroxide to make it dissolve, then adding 52 grams of hexamethyleneimine under stirring conditions, adding 225 grams of 40% silica sol, and finally adding 11 grams of carbon black, Mix the above reaction mixture evenly and crystallize at 140°C for 40 hours; finally, take out the above crystallized product, wash it, dry it, roast it, weigh 78 grams, knead it with 22 grams of alumina, extrude it, and bake it. The ethylbenzene catalyst A was obtained by drying and roasting, and the active component of the mesoporous MCM-22 molecular sieve had a weight content of 78%.

[0033] Among them, the pore size distribution of the crystallized product is shown in figure 2 shown. In terms of specific surface area percentage, the proportion of mesopores (pore diameter 2-100nm) is 73%, and the proportion of micropores (pore diameter 0.5-2nm) is 27%.

Embodiment 2

[0035] 40 g Al 2 (SO 4 ) 3 18H 2 O was dissolved in 460 grams of water, 42 grams of potassium hydroxide was added to dissolve it, then 38 grams of piperidine was added under stirring, 225 grams of 40% silica sol was added, and 27 grams of carbon black was finally added to make the above reaction mixture After mixing evenly, crystallize at 160°C for 70 hours; finally, take out the above-mentioned crystallized product, wash it, dry it, and roast it, weigh 62 grams, knead it with 38 grams of alumina, extrude it, dry it, and roast it. To obtain ethylbenzene catalyst B, the weight content of its active component mesoporous MCM-22 molecular sieve is 62%.

[0036] Among them, in terms of specific surface area percentage, the proportion of mesopores (2-100nm in diameter) is 56%, and the proportion of micropores (0.5-2nm in diameter) is 44%.

Embodiment 3

[0038] Dissolve 21 grams of sodium metaaluminate in 450 grams of water, add 12 grams of sodium hydroxide to dissolve it, then add 18 grams of piperidine and 9 grams of ethylenediamine under stirring, and then add 448 grams of ethyl orthosilicate , finally add 75 grams of carbon black, mix the above reaction mixture uniformly and then crystallize at 150°C for 55 hours; finally, take out the crystallized product, wash it with water, dry it, roast it, weigh 65 grams, and mix with 25 grams of The ethylbenzene catalyst C is obtained by kneading and extruding aluminum oxide, drying and roasting, and the active component mesoporous MCM-22 molecular sieve has a weight content of 65%.

[0039] Among them, in terms of specific surface area percentage, the proportion of mesopores (2-100nm in diameter) is 62%, and the proportion of micropores (0.5-2nm in diameter) is 38%.

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Abstract

The invention relates to a method of synthesizing a mesoporous MCM-22 molecular sieve and uses of the molecular sieve, and mainly overcomes a problem in the prior art that synthetic methods of MCM-22 molecular sieves are tedious in operation and not suitable for industrial production. According to a technical scheme adopted by the method, a silicon source, an aluminum source, an alkali source containing OH<->, a template R, water and carbon black (C) are mixed, the mole ratio of Al2O3:SiO2:OH<->:R:H2O:C is (0.01-0.10):1:(0.01-0.40):(0.01-0.50):(5-50):(0.1-5.0), the mixture is crystallized at 130-170 DEG C for 20-100 h, and a crystallization product is washed with water, dried and calcinated to obtain the mesoporous MCM-22 molecular sieve. The problem is overcome by adoption of the technical scheme. The mesoporous MCM-22 molecular sieve can be used for industrial production of ethylbenzene produced from benzene and ethylene.

Description

technical field [0001] The invention relates to a method for synthesizing a mesoporous MCM-22 molecular sieve and the application of the molecular sieve. Background technique [0002] Ethylbenzene is an important basic organic chemical raw material, mainly used to produce styrene, and styrene is an important monomer for the synthesis of polystyrene, styrene-butadiene rubber, ABS and SBS, and is also used in pharmaceutical, coating and textile industries. Very versatile. At present, the vast majority of ethylbenzene in the world is produced by the alkylation reaction of benzene and ethylene. Industrial ethylbenzene synthesis processes mainly include traditional aluminum chloride method, molecular sieve gas phase method and molecular sieve liquid phase method. Among them, the molecular sieve liquid-phase process for producing ethylbenzene has attracted widespread attention due to its low reaction temperature, low styrene-to-olefin ratio, and high product quality, and has gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04B01J29/70C07C15/073C07C2/66
CPCY02P20/52
Inventor 张斌杨为民孙洪敏沈震浩薛明伟
Owner CHINA PETROLEUM & CHEM CORP
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