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Method for producing isopropylbenzene by hydrogenolysis of alpha, alpha-dimethyl benzyl alcohol

A technology of dimethyl benzyl alcohol and cumene, applied in the α field, can solve the problems of environmental pollution, high energy consumption and power consumption, and high reaction temperature of Cr-containing catalysts, achieve good activity and selectivity, reduce pollution, and react The effect of low temperature

Inactive Publication Date: 2010-06-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in the existing α, α-dimethylbenzyl alcohol hydrogenolysis cumene technology, the use of Cr-containing catalysts has environmental pollution, high reaction temperature and high pressure, energy consumption and power consumption Big problem, to provide a new method of hydrogenolysis of α,α-dimethylbenzyl alcohol to cumene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Mix 100 grams of pseudo-boehmite with 3.5 grams of fenugreek powder evenly, then add dilute nitric acid for wet kneading, molding, drying, and roasting at 600°C in an air atmosphere to obtain a carrier. Weigh 20 g of calcined alumina support, impregnate with required H 2 PdCl 4 After solution, through drying, obtain the Pd / Al that Pd content is 0.3 parts by weight after roasting 2 o 3 Catalyst a.

Embodiment 2

[0021] Weigh 70 g of SiO 2 -Al 2 o 3 (SiO 2 26.0% by weight) powder, mixed evenly with 41.7 grams of pseudoboehmite and 3.5 grams of turnip powder, then added dilute nitric acid for wet kneading and molding, then dried and roasted at 600° C. in an air atmosphere to obtain a carrier. Weigh 20 grams of calcined silica-alumina-based carrier, mix with required Pd(NH 3 ) 4 Cl 2 After ion-exchanging the aqueous solution, after drying and roasting, the Pd content is 0.3 parts by weight of Pd / SiO 2 -Al 2 o 3 Catalyst b.

Embodiment 3

[0023] Weigh 100 g of NaMOR zeolite (MOR is mordenite) powder, exchange it twice with ammonium nitrate solution, dry and roast to obtain hydrogen-form HMOR zeolite. Weigh 70 grams of HMOR, mix with 41.7 grams of alumina powder and 3.5 grams of scallop powder, then add dilute nitric acid for wet kneading and molding, then dry and roast at 550 ° C in an air atmosphere to obtain the HMOR zeolite carrier. Weigh 20 grams of HHMOR zeolite carrier, mix with required Pd(NH 3 ) 4 Cl 2 , Pt(NH 3 ) 4 Cl 2 The mixed solution was ion-exchanged, dried, and calcined to obtain a Pd-Pt / MOR catalyst c whose Pd and Pt contents were both 0.5 parts by weight.

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Abstract

The invention relates to a method for producing isopropylbenzene by the hydrogenolysis of alpha, alpha-dimethyl benzyl alcohol, which mainly solves the problems of environmental pollution of a chromium-containing catalyst system in the traditional hydrogenolysis production of the alpha, alpha-dimethyl benzyl alcohol, higher reaction temperature and pressure, large energy consumption and power consumption and corrosion of an additive to equipment. The invention better solves the problems by adopting the technical scheme that the catalytic hydrogenolysis of the alpha, alpha-dimethyl benzyl alcohol is carried out to convert the raw material of the alpha, alpha-dimethyl benzyl alcohol after alkali wash into the isopropylbenzene by hydrogen gas and a bifunctional catalyst containing Pd or Pd-Pt metal under the conditions that the temperature is 80-200 DEG C and the hydrogen pressure calculated by the gage pressure is 0.1-2.0MPa. The invention can be used for the industrial production of the isopropylbenzene prepared by the hydrogenolysis of the alpha, alpha-dimethyl benzyl alcohol.

Description

technical field [0001] The invention relates to a method for preparing cumene by hydrogenolysis of α,α-dimethylbenzyl alcohol. 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. The production cost of propylene oxide is thus subject to fluctuations in the price of co-products. In addition, the large investment in the co-production process is also its main disadvantage. With cumene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/085C07C1/22B01J23/40
CPCY02P20/52
Inventor 刘仲能汪哲明马静萌王德举
Owner CHINA PETROLEUM & CHEM CORP
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