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Method for producing isopropyl benzene

A technology of cumene and cumene hydroperoxide, applied in the production of bulk chemicals, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. Low yield, high production cost and other problems, to achieve the effect of high yield, low process cost and avoid loss

Active Publication Date: 2013-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by this invention is that in the process of producing cumene, the existing technology uses a chromium-containing catalyst to cause pollution to the environment, or when using a Pd catalyst, the consumption of precious metals is large, which makes the production cost high. In addition, the cumene In order to solve the problem of low yield of cumene, a new method for producing cumene is provided, which has the advantages of high cumene yield, low cost of using catalyst, and environmental friendliness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Impregnation of H with activated carbon as a carrier 2 PdCl 4 The solution was dried and calcined in a nitrogen atmosphere at 400° C. for 4 hours to prepare a Pd / activated carbon catalyst a of 0.5% by weight. After the catalyst is activated under a hydrogen atmosphere, the prehydrogenation reaction of cumene hydroperoxide is carried out in a fixed-bed reactor.

Embodiment 2

[0024] α-Al 2 o 3 impregnating the carrier with H 2 PdCl 4 Solution, dried and roasted in air atmosphere at 400°C for 4 hours to obtain 1.0% Pt / Al by weight 2 o 3 Catalyst b. After the catalyst is activated under a hydrogen atmosphere, the prehydrogenation reaction of cumene hydroperoxide is carried out in a fixed-bed reactor.

Embodiment 3

[0026] with TiO 2 Powder compression molding as carrier, impregnated with H 2 PtCl 6 The solution was dried and calcined in an air atmosphere at 400°C for 4 hours to obtain 0.5% Pt / TiO by weight 2 Catalyst c. After the catalyst is activated under a hydrogen atmosphere, the prehydrogenation reaction of cumene hydroperoxide is carried out in a fixed-bed reactor.

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Abstract

The invention relates to a method for producing isopropyl benzene by using a material containing isopropyl benzene hydroperoxide and alpha-alpha-dimethyl benzyl alcohol, which mainly solves the problems that in the production process of the isopropyl benzene in the prior art, the isopropyl benzene hydroperoxide decomposes and releases phenol easily to reduce the yield of the isopropyl benzene, and a catalyst containing Cr easily causes environmental pollution. The method comprises the following steps: after alkali washing, allowing the material containing isopropyl benzene hydroperoxide and alpha-alpha-dimethyl benzyl alcohol which is adopted as a raw material to enter a pre-hydrogenation unit for converting the isopropyl benzene hydroperoxide in the raw material into the alpha-alpha-dimethyl benzyl alcohol; and allowing the raw material to enter a hydrogenolysis reaction unit for converting the raw material into the isopropyl benzene, wherein an active component of a pre-hydrogenation catalyst is Pd, Pt or a mixture of Pd and Pt or a mixture of the oxide of Pd and Pt; an active component of a hydrogenolysis atalyst is Pd, or a mixture of Pd and Pt or a mixture of the oxide of Pd and Pt; a technical scheme solves the problem; and the method can be applied to industrial production of the isopropyl benzene.

Description

technical field [0001] The invention relates to a method for producing cumene, in particular to a method for preparing cumene by catalytic hydrogenolysis of α,α-dimethylbenzyl alcohol raw materials containing cumene hydroperoxide. Background technique [0002] Propylene oxide is an important petrochemical organic raw material. At present, the main production methods of propylene oxide are chlorohydrin method and co-oxidation method (such as tert-butanol, ethylbenzene). The co-oxidation method uses organic peroxides as oxidants to oxidize propylene to propylene oxide. Although the traditional tert-butanol and ethylbenzene co-oxidation method can avoid the advantages of high investment and long process of chlorohydrin method that seriously pollutes the environment, it also has its disadvantages. In the process, a large number of co-production by-products will be generated. Thus the production cost of PO propane will be affected by fluctuations in the price of co-products. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/085C07C1/20B01J23/40
CPCY02P20/52
Inventor 汪哲明刘仲能马静萌
Owner CHINA PETROLEUM & CHEM CORP
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