Alpha, alpha-dimethyl benzyl alcohol hydrogenolysis catalyst as well as preparation method and application thereof

Abstract

The invention discloses an alpha, alpha-dimethyl benzyl alcohol hydrogenolysis catalyst and a preparation method and application thereof, the catalyst comprises a carrier, metal palladium loaded on the carrier and a silicon element loaded on the metal palladium, and the weight content ratio of the silicon element to the metal palladium is (0.1-8): 100. When the catalyst is applied to the hydrogenolysis process of alpha, alpha-dimethyl benzyl alcohol containing acetophenone, excessive hydrogenation of hydrogenolysis of alpha, alpha-dimethyl benzyl alcohol and hydrogenation of acetophenone in organic materials can be effectively inhibited, so that the selectivity of isopropyl benzene is effectively improved, the content of ethylbenzene in a product is controlled, and the later separation cost is reduced; the isopropylbenzene prepared by hydrogenolysis of alpha-dimethyl benzyl alcohol is good in stability and has a relatively high industrial application value.

Description

technical field [0001] The invention relates to a CHP process for preparing propylene oxide, in particular to the hydrogenolysis of propylene oxidation unit products. Background technique [0002] Propylene oxide (PO), as a downstream product of propylene, is an important organic chemical product and can be used to produce polyether polyols, the precursors of polyurethane materials. The CHP legal PO process developed by Japan Sumitomo Chemical Co., Ltd. has no joint products, no pollution to the environment, and less investment. It is an environmentally friendly clean production process. The new CHP PO process includes cumene oxidation, propylene epoxidation, α,α-dimethylbenzyl alcohol hydrogenolysis (DMBA) and other processes. In the propylene oxidation unit, cumene hydroperoxide oxidizes propylene to generate PO and α,α-Dimethylbenzyl alcohol, and a small amount of acetophenone by-product. [0003] Chinese patent CN104230643A uses two kinds of DMBA hydrogenolysis catalys...

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Problems solved by technology

[0008] Aiming at the problems of poor catalyst stability, serious environmental pollution, easy hydrogenation of by-product acetophenone and difficult operation in the existing DMBA hydrogenolysis technology in the CHP process of producing propylene oxide, the present invention provides an α,α-di A catalyst for the hydrogenolysis of methyl benzyl alcohol, in which an appropriate amount of Si is deposited on the surface of the catalyst active component Pd to effectively inhibit the excessive hydrogenation of α,α-dimethyl benzyl alcohol and the hydrogenation of acetophenone in organic materials, thereby effectively Improve the selectivity of cumene, control the content of ethylbenzene in the product, reduce the cost of separation in the later stage, and the obtained α,α-dimethylbenzyl alcohol hydrogenolysis catalyst is used in the hydrogenolysis of α,α-dimethylbenzyl alcohol to prepare cumene Good stability and high industrial application value

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