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Use of catalyst for alkylation reaction of aromatic hydrocarbons and low-carbon alkanes

A technology of low-carbon alkane and carbon-alkane, which is applied in the application field of catalyst in the alkylation reaction of aromatic hydrocarbon and low-carbon alkane, and can solve the problems of difficult activation, difficult application of industrial raw materials, etc.

Inactive Publication Date: 2011-05-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In natural gas, oilfield gas and refinery gas, low-carbon alkanes such as ethane and propane have a wide range of sources and are cheap, but due to their relatively stable structure, they are difficult to activate and are difficult to use as industrial raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] With 2.32 grams of ammonium molybdate (molecular formula is (NH 4 ) 6 Mo 7 o 24 ) was dissolved in 25 ml of deionized water, and SiO was added to the solution 2 / Al 2 o 3 38 HZSM-5 molecular sieve, impregnated for 2 hours, dried at 120°C for 3 hours, calcined at 550°C for 5 hours, finally pressed into tablets and pulverized to 20-40 mesh for later use. The weight ratio of Mo element to HZSM-5 molecular sieve is 6.7%.

[0025] The alkylation reaction of propane and benzene is carried out in a constant-flow fixed-bed microreactor with an inner diameter of 8 mm at normal pressure, and the amount of catalyst used is 1 gram. Before the reaction, the catalyst was reduced at 450°C and 30ml / min hydrogen atmosphere for 3h, then the temperature of the reactor was lowered to 350°C, and the reaction was carried out by feeding propane and benzene. The weight space velocity of propane and benzene was 2.0h -1 , the molar ratio of benzene to propane is 0.8, the conversion rate o...

Embodiment 2

[0027] With 3.60 grams of molybdic acid by (molecular formula is (NH 4 ) 6 Mo 7 o 24 ) was dissolved in 25 ml of deionized water, and SiO was added to the solution 2 / Al 2 o 3 38 HZSM-5 molecular sieve, impregnated for 2 hours, dried at 120°C for 3 hours, calcined at 550°C for 5 hours, finally pressed into tablets and pulverized to 20-40 mesh for later use. The weight ratio of Mo element to HZSM-5 molecular sieve is 10.4%.

[0028] The performance of the catalyst for the alkylation of propane and benzene was investigated in the same manner as in Example 1. At a reactor temperature of 350°C, the weight space velocity of propane and benzene is 2.0h -1 1. Under the reaction condition that the molar ratio of benzene and propane is 0.8, the conversion rate of propane is 3.5%, and in the carbon-containing reaction product, toluene accounts for 6.4mol%, ethylbenzene accounts for 24.6mol%, cumene accounts for 30.4mol%, n-propylbenzene accounts for 38.7 mol%.

Embodiment 3

[0030] 5.34 gram molybdic acids are pressed (molecular formula is (NH 4 ) 6 Mo 7 o 24 ) was dissolved in 25 ml of deionized water, and SiO was added to the solution 2 / Al 2 o 3 38 HZSM-5 molecular sieve, impregnated for 2 hours, dried at 120°C for 3 hours, calcined at 550°C for 5 hours, finally pressed into tablets and pulverized to 20-40 mesh for later use. The weight ratio of Mo element to HZSM-5 molecular sieve is 15.4%.

[0031] The performance of the catalyst for the alkylation of propane and benzene was investigated in the same manner as in Example 1. At a reactor temperature of 350°C, the weight space velocity of propane and benzene is 2.0h -1 1. Under the reaction condition that the molar ratio of benzene and propane is 0.8, the conversion rate of propane is 2.2%, and in the carbon-containing reaction product, toluene accounts for 10.5mol%, ethylbenzene accounts for 28.0mol%, cumene accounts for 22.6mol%, n-propylbenzene accounts for 38.9 mol%.

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Abstract

The invention relates to application of a catalyst in the alkylation reaction of aromatic hydrocarbon and light alkane. The catalyst contains Mo element and ZSM-5 molecular sieve, wherein the weight ratio of the Mo element and the ZSM-5 molecular sieve is 1-16%. The catalyst contains 5-40 wt% of binder. The reaction temperature in the alkylation reaction of the aromatic hydrocarbon and the light alkane is 250-450 DEG C; the mole ratio of the feeding aromatic hydrocarbon and the light alkane is 0.5-3, and the weight air speed is 0.2-5 / h. When the catalyst is applied to the alkylation reaction of benzene and propane, toluene, ethyl benzene, isopropyl benzene and n-propylbenzene can be prepared with high selectivity.

Description

technical field [0001] The present invention relates to the application of a catalyst in the alkylation reaction of aromatic hydrocarbons and low-carbon alkanes, in particular, it relates to a catalyst containing Mo element and hydrogen type ZSM-5 molecular sieve which is applied to aromatic hydrocarbons such as benzene, toluene and ethane, In the alkylation reaction of low-carbon alkanes such as propane, alkyl aromatics are produced. Background technique [0002] In natural gas, oilfield gas and refinery gas, low-carbon alkanes such as ethane and propane have a wide range of sources and are cheap, but due to their relatively stable structure, they are difficult to activate and are difficult to use as industrial raw materials. In recent years, a new method for the utilization of low-carbon alkanes has been proposed, that is, to react low-carbon alkanes with aromatics such as benzene and toluene to synthesize alkylbenzenes such as ethylbenzene, xylene, cumene, and ethyltoluen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/16C07C2/66C07C15/02
CPCY02P20/52
Inventor 黄学庆刘中民孙新德朱书魁
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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