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Catalyst for producing dimethylbenzene by alkylation of benzene and methanol

A catalyst and alkylation technology, applied in the directions of carbon compound catalysts, catalysts, physical/chemical process catalysts, etc., can solve the problems of low utilization rate of alkylation, low xylene selectivity, low benzene conversion rate, etc. The effect of alkylation reaction utilization rate, selectivity improvement, and technology implementation effect

Inactive Publication Date: 2012-07-25
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problems of low conversion rate of benzene, low utilization rate of alkylation caused by conversion of methanol itself, and low selectivity of xylene in the benzene cycloalkylation catalyst of benzene and methanol in previous literatures. A New Catalyst for Alkylation of Benzyl Alcohol to Xylene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take Na 2 O content less than 0.1wt%, SiO 2 / Al 2 o 3 The molar ratio is 70.0 grams of ammonium type MCM-22 molecular sieve powder of 50,550 DEG C of loss on ignition 10wt%, adds 40.5 grams of silica sol (SiO 2 weight percent content 40%), with analytically pure cerous nitrate [Ce(NO 3 ) 3 ·6H 2 O] impregnated with the same amount of solution, dried and roasted. The obtained weight ratio is Ce / hydrogen type MCM-22 molecular sieve / SiO 2 =12 / 76 / 24 of Catalyst A.

Embodiment 2

[0019] Take Na 2 O content less than 0.1wt%, SiO 2 / Al 2 o 3 Molar ratio is 70.0 grams of ammonium type MCM-22 molecular sieve powders of 60, loss on ignition 10wt%, with Na 2 Pseudoboehmite (α-Al 2 o 3 ·H 2 O) 40.5 grams are fully mixed evenly, kneaded and extruded into strips, dried, roasted and cut into pellets, and analyzed with pure lanthanum nitrate [La(NO 3 ) 3 ·nH 2 O] solution impregnation, drying, roasting, with analytically pure magnesium acetate [Mg(CH 3 COO) 2 4H 2 O] solution impregnation, drying and roasting. Catalyst B with a weight ratio of La / Mg / hydrogen MCM-22 molecular sieve / alumina=1 / 8 / 76 / 24 was prepared.

Embodiment 3

[0021] Take Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 Molar ratio is 80, the ammonium type MCM-22 molecular sieve powder 70.0 grams of loss on ignition 10wt%, add 58.1 grams of pseudo-boehmite (α-Al 2 o 3 ·H 2 O), fully mixed evenly, kneaded and extruded into strips, dried and then roasted and cut into pellets. First, use analytically pure lanthanum nitrate [La(NO 3 ) 3 ·nH 2 O] solution equal amount of impregnation, drying, roasting, and then calcium nitrate [Ca(NO 3 ) 2 4H 2 O] solution equal volume impregnation, drying and roasting. The obtained weight ratio is: La / Ca / hydrogen MCM-22 molecular sieve / Al 2 o 3 Catalyst C = 16 / 5 / 58 / 42.

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PUM

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Abstract

The invention relates to a catalyst for producing dimethylbenzene by alkylation of benzene and methanol. The catalyst mainly overcomes the shortcomings of low utilization rate of methanol alkylation, low conversion rate of benzene and low selectivity of dimethylbenzene in the actual application of the catalyst reported in previous literatures. Through the adoption of the technical scheme of loading alkaline earth and rare-earth metal elements on a hydrogen-type MCM-22 molecular sieve, the problem is well solved. The catalyst provided by the invention is high in selectivity and can be used in the production process of dimethylbenzene by alkylation of benzene and methanol.

Description

technical field [0001] The invention relates to a catalyst used for the alkylation of benzene and methanol to produce xylene. Background technique [0002] my country's mineral deposits are "more coal and less oil". The shortage of oil will become one of the main bottlenecks of my country's industrial development. The sustainable and healthy development of the national economy requires that my country must rely on its own resource advantages to develop the production technology of petrochemical raw materials. The country has established " The strategy of "replacing oil with coal" is the development direction of energy and resources. At present, the methanol production technology from coal coke oven gas and synthesis gas has been maturely applied, but in recent years, a large number of methanol plants have been put into operation in my country, resulting in a relative surplus of methanol production capacity. In addition to olefins as derivatives of methanol conversion, for m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70C07C15/08C07C2/88
CPCC07C2/864B01J23/10B01J29/7088B01J37/0201C07C2529/70Y02P20/52C07C15/08
Inventor 朱志荣任向坤向浩李军辉王亚楠
Owner TONGJI UNIV
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