Alpha, alpha-dimethyl-benzyl carbinol direct hydrogenolysis method for preparing isopropyl benzene

A technology of dimethylbenzyl alcohol and cumene, applied in the field of alpha, can solve the problems of unstable catalyst, environmental pollution, large amount of precious metals and the like

Active 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-dimethyl-benzyl carbinol direct hydrogenolysis method for preparing isopropyl benzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 100.0 g activated carbon (specific surface area 1000 m 2 / g) soaked in 5mol / L HNO 3 24 hours, then washed to pH 7.0 and then dried, 250 o Carrier I was obtained by roasting in C air; 1.0 g PdCl 2 The solid was dissolved in a solution consisting of 10 g of concentrated hydrochloric acid, 19.0 g of nickel nitrate hexahydrate, and 70.0 g of purified water to obtain solution I. 50.0g solution I was impregnated on 50.0g carrier I, after drying at 250 o Catalyst 1 was obtained by calcining at C for 4 h. Its composition is: 0.57 parts of Pd-4.62 parts of NiO-94.8 parts of C.

[0021] Catalyst 1 was loaded into a fixed-bed reactor with a loading capacity of 40.0 ml, and the 2 250 o C for 4 hours. Containing α, the α-dimethylbenzyl alcohol hydrocarbon material contains 25% α, α-dimethylbenzyl alcohol and 75% cumene by weight percentage. The reaction process conditions are: reaction temperature 150 ° C, reaction pressure 2.0 MPa, H 2 / α, the molar ratio of α-dimethylben...

Embodiment 2

[0024] 100.0 g activated carbon (specific surface area 1000 m 2 / g) soaked in 5mol / L HNO 3 24 hours, then washed to pH 7.0 and then dried, 200 o Carrier I was obtained by roasting in C air; 2.0 g PdCl 2 The solid was dissolved in a solution consisting of 10 g of concentrated hydrochloric acid, 19.0 g of cobalt nitrate hexahydrate, and 69.0 g of purified water to obtain solution I. 50.0g solution I was impregnated on 50.0g carrier I, after drying at 250 o Catalyst 2 was obtained by calcining at C for 4 h. Its composition is: 1.12 parts of Pd-4.60 parts of CoO-94.28 parts of C.

[0025]Catalyst 2 was loaded into a fixed-bed reactor with a loading capacity of 40.0 ml, and the 2 300 o C for 4 hours. Containing α, the α-dimethylbenzyl alcohol hydrocarbon material contains 25% α, α-dimethylbenzyl alcohol and 75% cumene by weight percentage. The reaction process conditions are: reaction temperature 150 ° C, reaction pressure 2.0 MPa, H 2 / α, the molar ratio of α-dimethylben...

Embodiment 3

[0028] 100.0 g activated carbon (specific surface area 1000 m 2 / g) soaked in 5mol / L HNO 3 24 hours, then washed to pH 7.0 and then dried, 200 o Carrier I was obtained by roasting in C air; 1.0 g PdCl 2 The solid was dissolved in 10 g concentrated hydrochloric acid, 15.0 g SnCl 4 ·5H 2 O, obtain solution I in the solution that 74.0g pure water forms. 50.0g solution I was impregnated on 50.0g carrier I, after drying at 250 o Catalyst 3 was obtained by calcining at C for 4 h. Its composition is: 0.56 parts of Pd-6.02 parts of SnO 2 -93.42 parts of C.

[0029] Catalyst 3 was loaded into a fixed-bed reactor with a loading capacity of 40.0 ml, and the 2 300 o C for 4 hours. Containing α, the α-dimethylbenzyl alcohol hydrocarbon material contains 25% α, α-dimethylbenzyl alcohol and 75% cumene by weight percentage. The reaction process conditions are: reaction temperature 170 ° C, reaction pressure 2.0 MPa, H 2 / α, the molar ratio of α-dimethylbenzyl alcohol is 8.0, and ...

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Abstract

The invention relates to an alpha, alpha-dimethyl-benzyl carbinol direct hydrogenolysis method for preparing isopropyl benzene, and mainly solves the problem of poor stability of catalyst in the prior art for isopropyl benzene production by alpha, alpha-dimethyl-benzyl carbinol hydrogenolysis. A technical scheme for solving the problem is as below: introducing raw materials of hydrocarbons containing alpha, alpha-dimethyl-benzyl 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) 0.2-2.0 parts of Pd; b) 91.0-98.0 parts of active carbon; and c) 1.0-10.0 parts of at least one selected from Ni or oxide thereof, Co or oxide thereof, Cu or oxide thereof and Sn or oxide thereof. The method can be used for 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] Propylene oxide (PO for short) is a widely used chemical raw material, and its output is second only to polypropylene among propylene derivatives. The largest use of PO is to produce polyether polyols as foam and non-foam polyurethane raw materials, followed by the production of propylene glycol. PO is also widely used in the production of non-ionic surfactants, oilfield demulsifiers, pesticide emulsifiers and developers. Wait. There are currently three main PO commercial production processes, chlorohydrin method, co-oxidation method (PO / SM) and cumene peroxide cycle method (CHP). At present, propylene oxide plants using chloroalcoholization and co-oxidation methods account for more than 99% of the world's total production capacity of propylene oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/085C07C1/24
Inventor 王辉刘仲能王德举张勤吕建刚顾国耀
Owner CHINA PETROLEUM & CHEM CORP
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