Alpha, alpha-dimethylbenzyl alcohol hydrogenolysis method for preparing isopropyl benzene

A technology of dimethyl benzyl alcohol and cumene, applied in the field of α, which can solve the problems of unstable catalyst, large amount of precious metal, and high production cost

Inactive Publication Date: 2014-12-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by this invention is that in the process of producing cumene, the existing technology uses chromium-containing catalysts to cause pollution to the environment, or when using Pd catalysts, the consumption of precious metals is large, the production cost is high, and the catalyst is unstable. problem, providing a new method for the production of cumene

Method used

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  • Alpha, alpha-dimethylbenzyl alcohol hydrogenolysis method for preparing isopropyl benzene
  • Alpha, alpha-dimethylbenzyl alcohol hydrogenolysis method for preparing isopropyl benzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Combine 100 g silica with 100 g Mg 2+ Impregnated in equal volume of aqueous solution with a content of 2%, dried, 600 o After calcination of C for 4 h, MgO-modified precursor I was obtained; 1.0 g of PdCl 2 , 15.0 g Ni (NO 3 ) 2 ·6H 2 O, solution I was obtained in a solution consisting of 10.0 g concentrated hydrochloric acid and 74.0 g purified water. 50g of solution I was dipped on 50g of precursor I, dried at 500 o Catalyst 1 was obtained by calcining at C for 4.0 h. Its composition is: 0.57 parts of Pd-3.09 parts of MgO-3.68 parts of NiO-92.67 parts of SiO 2 .

[0024] Load 40.0 ml of catalyst 1 into a fixed bed reactor, 250 o Hydrogen reduction at C for 4 hours. The α,α-dimethylbenzyl alcohol-containing hydrocarbon material contains 15% α,α-dimethylbenzyl alcohol and 85% cumene by weight percentage. Reaction process condition is: reaction inlet temperature 170 ℃, reaction pressure 2.0 MPa, H 2 / α,α-dimethylbenzyl alcohol molar ratio 8.0, liquid volume s...

Embodiment 2

[0027] Combine 100 g silica with 100 g Ca 2+ Impregnated in equal volume of aqueous solution with a content of 2%, dried, 500 o After calcination of C for 4 h, the CaO-modified precursor I was obtained; 1.5 g of PdCl2 , 15.0 g Ni (NO 3 ) 2 ·6H 2 O, solution I was obtained in a solution composed of 10.0 g concentrated hydrochloric acid and 73.5 g purified water. 50g of solution I was dipped on 50g of precursor I, dried at 500 o Catalyst 2 was obtained by calcining at C for 4.0 h. Its composition is: 0.85 parts of Pd-2.6 parts of CaO-3.67 parts of NiO-92.87 parts of SiO 2 .

[0028] Load 40.0 ml of catalyst 2 into a fixed bed reactor, 250 o Hydrogen reduction at C for 4 hours. The hydrocarbon material containing α,α-dimethylbenzyl alcohol contains 25% α,α-dimethylbenzyl alcohol and 75% cumene by weight percentage. Reaction process conditions are: reaction inlet temperature 170 ℃, reaction pressure 3.0 MPa, H 2 Molar ratio of / α,α-dimethylbenzyl alcohol 10.0, liquid vol...

Embodiment 3

[0031] Combine 100 g silica with 100 g Ba 2+ Impregnated in equal volume of aqueous solution with a content of 2%, dried, 500 o BaO-modified precursor I was obtained after calcination of C for 4 h; 1.5 g of PdCl 2 , 15.0 g Ni (NO 3 ) 2 ·6H 2 O, solution I was obtained in a solution composed of 10.0 g concentrated hydrochloric acid and 73.5 g purified water. 50g of solution I was dipped on 50g of precursor I, dried at 500 o Catalyst 3 was obtained by calcining at C for 4.0 h. Its composition is: 0.85 parts of Pd-2.09 parts of BaO-3.67 parts of NiO-93.39 parts of SiO 2 .

[0032] Charge 40.0 ml of catalyst 3 into a fixed bed reactor, 250 o Hydrogen reduction at C for 6 hours. The hydrocarbon material containing α,α-dimethylbenzyl alcohol contains 25% α,α-dimethylbenzyl alcohol and 75% cumene by weight percentage. Reaction process conditions are: reaction inlet temperature 170 ℃, reaction pressure 3.0 MPa, H 2 Molar ratio of / α,α-dimethylbenzyl alcohol 10.0, liquid vol...

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Abstract

The invention relates to an alpha, alpha-dimethyl-benzyl carbinol hydrogenolysis method for preparing isopropyl benzene, and mainly solves the problems of poor stability of catalyst and serious environmental pollution in the isopropyl benzene production process. A technical scheme for solving the problem is as below: introducing raw materials of hydrocarbons containing alpha, alpha-dimethylbenzyl alcohol and hydrogen into a hydrogenolysis reaction zone, and reacting the raw materials with a catalyst by contact to produce isopropyl benzene. The catalyst comprises the following components by weight: a) 0.1-2.0 parts of Pd metal or oxide; b) 85.0 to 97.0 parts of SiO2; c) 1.0-10.0 parts of at least one selected from Ni or oxide thereof, Co or oxide thereof, and Cu or oxide thereof; and d) 1.0 to 5.0 parts of at least one selected from Mg or oxide thereof, Ca or oxide thereof and Ba or oxide thereof. The method can be used in industrial production of isopropyl benzene by alpha, alpha-dimethyl-benzyl carbinol hydrogenolysis.

Description

technical field [0001] The invention relates to a method for preparing cumene, in particular to a method for preparing cumene by catalytic hydrogenolysis of α,α-dimethylbenzyl alcohol raw materials. Background technique [0002] At present, there are three main commercial production processes of propylene oxide (referred to as PO), chlorohydrin method, co-oxidation method (PO / SM) and cumene peroxide recycling method (CHP). At present, propylene oxide plants using chlorohydrin and co-oxidation methods account for more than 99% of the world's total production capacity of propylene oxide, of which the chlorohydrin method accounts for about 45% and the co-oxidation method accounts for about 54%; in the co-oxidation method, The ethylbenzene method is 33%, the isobutane method is 18%, and the cumene hydroperoxide method is 3%. Due to the relatively low conversion rate of propylene, the hydrogen peroxide route and the direct oxidation route are relatively low, resulting in unsatis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/085C07C1/20B01J23/89
CPCY02P20/52
Inventor 王辉刘仲能王德举黄琴琴张勤李则俊
Owner CHINA PETROLEUM & CHEM CORP
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