Hydrogenolysis catalyst and preparation method thereof

Abstract

The invention discloses a hydrogenolysis catalyst. The catalyst is composed of the following components in parts by weight: 93.0-97.0 parts of a carrier, 0.5-2.5 parts of metal Pt and 2.0-5.0 parts of metal A, wherein the metal Pt and the metal A are loaded on the carrier, the carrier is phenolic resin-based activated carbon, and the metal A is one of Ni, Mo, Sn or Ru, or a composition of two or more of Ni, Mo, Sn or Ru according to any ratio; when the hydrogenolysis catalyst is used for catalysis during preparation of cumene by hydrogenolysis of alpha,alpha-dimethyl benzyl alcohol, the conversion rate of alpha, alpha-dimethyl benzyl alcohol is larger than or equal to 99.9%, the selectivity of cumene is larger than or equal to 98.0%, and the content of the by-product isopropylcyclohexane is 0-3 ppm; in addition, the invention further provides a preparation method for the hydrogenolysis catalyst. The hydrogenolysis catalyst is high in carrier strength, active components are dispersed uniformly, the load ratio is high, the stability is high, and the hydrogenolysis catalyst is applied to process technologies for industrial preparation of cumene through hydrogenolysis of alpha, alpha-dimethyl benzyl alcohol.

Description

technical field [0001] The invention belongs to the field of petrochemical technology, and in particular relates to a hydrogenolysis catalyst for preparing cumene by hydrogenolysis of α,α-dimethylbenzyl alcohol and a preparation method thereof. Background technique [0002] Propylene oxide (PO) is a bulk chemical raw material with more and more uses. At present, the method for synthesizing PO with cumene hydroperoxide (hereinafter referred to as CHP method) is more and more popular. The advantage of the CHP method is that the α,α-dimethylbenzyl alcohol generated during the reaction can be hydrogenolyzed to synthesize cumene and then recycled, with almost no by-products generated. For the above-mentioned hydrogenolysis reaction, the catalyst is very important. Improper selection of the catalyst not only affects the stability of the system operation, but also easily leads to side reactions. eventually deactivated. [0003] U.S. Patent No. 6,646,139 reports the process techn...

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Problems solved by technology

However, the catalyst in this method is prone to carbon deposition, Cu is prone to high-temperature loss, and Cr pollutes the environment. In addition, the service life of this type of catalyst and the content of by-product isopropyl cyclohexane are not mentioned.

[0004] Chinese patent CN101735004 reports the use of Pd or Pd-Pt metal bifunctional catalysts to catalyze the hydrogenolysis of α,α-dimethylbenzyl alcohol at a temperature of 80 to 160°C and a pressure of 0.1 to 2.0 MPa to prepare cumene. In this method, the raw material α , α-dimethylbenzyl alcohol must be washed with alkali before the reaction, resulting in a lot of waste liquid, and the conversion rate is ≤99.5%, and the selectivity of cumene is ≥99.5%. The hydrogenation metal component in the catalyst is impregnated or ionized The exchange method is used for loading, the loading rate is low, the manufacturing cost is high, and there are problems such as high activity, which may easily cause the system to overheat in the initial stage of the reaction.

[0005] Chinese patent CN104151129 reports a method for preparing cumene from α-methylstyrene by using an AMS selective hydrogenation catalyst. The catalyst is composed of Pd / Ca / K / Mg / Ba, etc., with Al 2 o 3 As a carrier, the conversion rate of α-methylstyrene can reach 100%, and the by-product isopropyl cyclohexane can reach 0ppm, but the selectivity of cumene is only ≥96%, and the strength of the carrier is not high, so the catalyst life is limited

[0006] However, the method of preparing modified platinum / carbon hydrogenolysis catalyst with phenolic carbon as a carrier and using it to catalyze the reduction of α, α-dimethylbenzyl alcohol has not yet been reported in domestic and foreign patent literature.

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