Catalyst for preparing phenol with catalysis distillation and method for preparing phenol

Abstract

The invention discloses a catalyst for the preparation of phenol by catalytic rectification and a phenol preparation method thereof, relating to the preparation of a compound. The invention provides a non-porous solid catalyst used to catalyze phenol preparation by catalytic rectification, as well as a phenol preparation method integrated with catalytic reaction and rectification separation by reaction rectification. The catalyst is a resin polysiloxanes metal complex, and the compostion is SiMR, wherein, M indicates metal complex, R indicates organic carbon chain. The process of phenol preparation by catalytic rectification includes: firstly, double helix ring high-efficient filler is filled in the stripping section and the rectification section of the rectifying tower; proper catalyst is filled in the catalytic rectification section and diluted with the same filler at the ratio of 4:1; the main feed CHP inlet is arranged between the rectification section and the reaction section, and the feed CHP is diluted with acetone at the ratio of 1:1; the auxiliary feed acetone inlet is arranged between the stripping section and the reaction section, the feed quantity covers 50-100 percent of the main feed quantity, and the product is collected at the tower top and the tower bottom. The heat of reaction can be applied to rectifying separation.

Description

technical field [0001] The present invention relates to the preparation of a kind of compound, especially the method for preparing phenol by reactive distillation. Background technique [0002] According to statistics, more than 90% of phenol in the world is produced by the cumene method. The process steps are as follows: benzene and propylene are reacted to obtain cumene; cumene is oxidized by oxygen or air to generate cumene hydroperoxide (CHP); CHP is decomposed to generate phenol and acetone. This method is most typical with the phenol method technology of KBR company. In addition to the production of high-purity phenol and acetone from cumene, the by-products α-methylstyrene (AMS) and acetophenone (AP) are also recovered. In this process, the efficiency of cumene to be oxidized to CHP by air is as high as 95%, and CHP is concentrated and decomposed into phenol and acetone with high yield (greater than 99%) in the presence of an acid catalyst. AMS is hydrogenated to c...

AI Technical Summary

Problems solved by technology

[0003] The acid-catalyzed decomposition of cumene hydroperoxide in the production process of cumene method to produce phenol has the following problems: (1) sulfuric acid needs to be neutralized with alkali as a catalyst, which consumes acid and alkali and causes pollution, and the equipment must be durable Acid and alkali corrosion, and the process is complicated; (2) a large amount of heat released by the acid-catalyzed decomposition process cannot be effectively utilized, and needs to be drawn out with circulating acetone, and the energy utilization of the process is very unreasonable; (3) the concentration of cumene hydroperoxide is not enough Safe, and more side effects when the concentration is high

The result is that the actual reaction temperature within the catalyst is too high, the by-products increase and the selectivity decreases