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Shape-selective alkylation catalyst for synthesizing p-cymene with toluene and propylene as raw materials

A technology for p-methyl cumene and catalyst, which is applied in the field of shape-selective alkylation catalysts, can solve the problems of low total selectivity, limited industrial application, and cannot be satisfied, and achieves suppression of side reactions, high selectivity and conversion rate. , the effect of improving the effect

Inactive Publication Date: 2011-01-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technologies reported in the above literatures have all improved the selectivity of p-cymene and the conversion rate of toluene, but the total selectivity is still low
It cannot meet the needs of actual production, which limits its industrial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Using SiO 2 / Al 2 o 3 45 grams of hydrogen-type ZSM-35 molecular sieve with a molar ratio of 20 and 15 grams of Al 2 o 3 Mix, then add 1.6 grams of Tianqing powder and mix evenly, then add a certain amount of 3% dilute nitric acid as a binder and knead well, carry out extrusion molding, after drying at 120°C, roast at 530°C to make catalyst I.

Embodiment 2

[0031]The molded ZSM-35 molecular sieve was prepared by the method described in Example 1, and the prepared molecular sieve was impregnated with a prepared petroleum ether solution containing 20% ​​amino silicone oil, and left to stand after impregnation until the solvent was completely evaporated. Calcined at 520°C to make Catalyst II, the amount of silicon deposited was 5.2%.

Embodiment 3

[0033] The ZSM-35 molecular sieve prepared by the method described in Example 1 was impregnated with the obtained molecular sieve in a 5.5% magnesium nitrate aqueous solution, and after the impregnation, the remaining impregnating solution was filtered off. It was dried at 120°C for 3 hours, and then calcined at 530°C for 4 hours. The temperature was programmed to rise at a rate of 3°C / min. It was designated as catalyst III with a magnesium loading of 3.8%.

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PUM

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Abstract

The invention relates to a shape-selective alkylation catalyst for synthesizing p-cymene with toluene and propylene as the raw materials. The catalyst adopts the following components in 100 parts by weight: 40-90 parts of one or mixture of any two of ZSM-35 zeolite, Beta zeolite or MCM-22 zeolite, 1-15 parts of at least one metal oxide of rare-earth metals or alkaline earth metals and the balance oxide binders, wherein the mole ratio of SiO2 to Al2O3 in ZSM-35 zeolite is 20-100; and the ZSM-35 zeolite, Beta zeolite or MCM-22 zeolite is subjected to surface modification by liquid Si deposition. The reaction conditions for synthesizing p-cymene are as follows: reaction temperature: 340-460 DEG C, pressure: 0-3.0MPa, benzene / alkene ratio: 2.0-10.0, and space velocity: 0.5-8h<-1>. The catalyst has good catalytic reaction effect after being applied to the toluene alkylation process for synthesizing p-cymene with toluene and propylene as the raw materials. The invention solves the following problems: the conversion rate of toluene is low, such secondary reactions as disproportionation reaction and isomerisation reaction are serious and the catalyst is fast in deactivation.

Description

technical field [0001] The invention relates to a shape-selective alkylation catalyst for synthesizing p-cymene from toluene and propylene, which can be applied to the chemical production of synthesizing p-cymene, and can especially catalyze the synthesis of para-methyl with high selectivity Cumene, and avoid the production of m- and ortho-methyl cumene by-products. Background technique [0002] p-methylcumene, also known as p-cymene (commonly known as p-cymene), is a widely used chemical product. It is widely used and can also be used as an intermediate for various organic synthesis products. Isopropyltoluene (IPT) is mainly synthesized from toluene and propylene by alkylation under the action of an acidic catalyst; the industrial production process is divided into Monsanto / LumInus Crast method (aluminum trichloride catalyst) according to the catalyst used. and UOP—Hercules method (phosphoric acid / diatomite catalyst); among them, the pollution problem of the aluminum tric...

Claims

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Application Information

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IPC IPC(8): B01J29/65B01J29/70B01J29/80C07C15/02C07C2/66
CPCY02P20/52
Inventor 朱志荣
Owner TONGJI UNIV
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