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Method for preparing alpha, alpha-dimethyl benzyl alcohol by hydrogenating hydrogen dioxide isopropyl benzene

A technology for cumene hydrogen peroxide and dimethylbenzyl alcohol, which is applied in the field of hydrogen peroxide cumene hydrogenation to produce α,α-dimethylbenzyl alcohol, and can solve problems such as poor stability of Pd catalysts

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by this invention is that in the process of producing α, α-dimethylbenzyl alcohol by the hydrogenation of cumene hydroperoxide in the existing technology, the problem of Pd catalyst stability is poor, and a kind of new hydrogen peroxide is provided A method for producing α,α-dimethylbenzyl alcohol by hydrogenation of cumene, which has the advantage of good catalyst stability

Method used

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  • Method for preparing alpha, alpha-dimethyl benzyl alcohol by hydrogenating hydrogen dioxide isopropyl benzene
  • Method for preparing alpha, alpha-dimethyl benzyl alcohol by hydrogenating hydrogen dioxide isopropyl benzene

Examples

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Embodiment 1

[0012] Formed Al 2 o 3 After drying at 120°C for 6 hours and calcining at 600°C for 4 hours to obtain a carrier (specific surface is 208m 2 / g, the pore volume is 0.78mL / g, and the average pore diameter is 12.5nm). The carrier is impregnated with the mixed salt solution containing the required amount of Pb, Na and Pd components, dried at 120°C for 4 hours and calcined at 550°C for 4 hours to obtain a weight percentage of 0.1%Pd-0.1%Pb-0.1%Na / Al 2 o 3 Catalyst a.

Embodiment 2

[0014] Formed Al 2 o 3 After drying at 120°C for 6 hours and calcining at 750°C for 4 hours to obtain a carrier (specific surface is 200m 2 / g, the pore volume is 0.69mL / g, and the average pore diameter is 13.2nm). Impregnate the carrier with the mixed salt solution containing the required amount of Pd, Sn and In components and dry at 120°C for 4 hours, then impregnate the carrier with the mixed solution containing the required amount of K and Mg components, and dry at 120°C for 4 hours Hours and 550 ° C for 4 hours to produce 0.5% Pd-2.0% Sn-1.0% In-0.5% K-1.5% Mg / SiO in terms of weight percentage 2 Catalyst b.

Embodiment 3

[0016] Al after molding 2 o 3 After drying at 120°C for 6 hours and calcining at 1200°C for 2 hours to obtain a carrier (specific surface is 75m 2 / g, the pore volume is 0.28mL / g, and the average pore diameter is 24.6nm). The carrier is impregnated with the solution containing the required amount of Mg component, dried at 120°C for 4 hours, then impregnated with the mixed solution containing the required amount of Pd and Pb, dried at 120°C for 4 hours and calcined at 550°C for 4 hours. 0.5%Pd-1.0%Pb-10.0%Mg / Al by weight 2 o 3 Catalyst c.

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Abstract

The invention relates to a method for preparing alpha, alpha-dimethyl benzyl alcohol by hydrogenating hydrogen dioxide isopropyl benzene, which is mainly used for solving the problem in the existing technology for preparing alpha, alpha-dimethyl benzyl alcohol by hydrogenating the hydrogen dioxide isopropyl benzene that the Pd catalyst is poor in stability. The technical scheme adopted by the invention is as follows: causing the hydrogen dioxide isopropyl benzene utilized as a raw material to be in contact with catalyst for react under the conditions that the reaction temperature is 40-120 DEG C, the reaction pressure is 0.1-4.0MPa, the volume air speed is 0.2-15.0 h<-1>, and the molar ratio of hydrogen to the hydrogen dioxide isopropyl benzene is (1.5-20.0):1, thus generating the alpha, alpha-dimethyl benzyl alcohol, wherein the adopted catalyst comprises the following components in percentage by weight: a) 0.1-2.0% of mixture of Pd metal or oxide; b) 85.0-99.7% of aluminum oxide or silicon oxide; c) 0.1-5.0% of at least one of metal or oxide of Sn, Pb or In; and d) 0.1-10.0% of at least one of metal or oxide of Na, K, Cs, Mg, Ca or Ba, thus the problem in the prior art is solved, and the method provided by the invention can be used for industrial production of the alpha, alpha-dimethyl benzyl alcohol by hydrogenating the hydrogen dioxide isopropyl benzene.

Description

technical field [0001] The invention relates to a method for preparing α, α-dimethylbenzyl alcohol by hydrogenating cumene hydroperoxide. Background technique [0002] α, α-Dimethylbenzyl alcohol is an important fine chemical raw material, which can be used to synthesize dicumyl hydroperoxide and perfumes of different flavors used in cosmetics. Generally, α,α-dimethylbenzyl alcohol is produced industrially by reducing cumene hydroperoxide with sulfide. In order to ensure that cumene hydroperoxide is fully reduced, the amount of sodium sulfide often exceeds the theoretical amount, so that the α produced in this way, the α-dimethyl benzyl alcohol product will often be polluted by sulfide, which will have a negative impact on the subsequent use process. Negative impact. The production of α,α-dimethylbenzyl alcohol by hydrogenation of cumene hydroperoxide is a clean and environmentally friendly production method, and the water generated in the reaction can be removed by simple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C33/20C07C29/132B01J23/62
Inventor 刘仲能汪哲明马静萌王辉
Owner CHINA PETROLEUM & CHEM CORP
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