Liquid-solid phase loaded catalyst used in production of acetic acid and preparation method thereof

Abstract

The invention relates to a liquid-solid phase loaded catalyst used in the production of acetic acid and a preparation method thereof. In the catalyst, carbon fiber or glass fiber is used as a main carrier. The preparation method comprises the following steps of: removing a surface coating from the carbon fiber or the glass fiber; performing electrochemical oxidation on the carbon fiber and introducing hydroxyl into the surface of the carbon fiber; performing a coupling reaction on the carbon fiber or the glass fiber and a silane coupling agent; loading catalytic active ingredients such as rhodium, iridium and the like on the surface of the catalyst carrier through chemical bonds after reaction; and performing carbonylation on catalytic methanol to obtain the acetic acid. Verification proves that the catalyst of the invention has high stability, a process for separating the catalyst from a liquid product is simple and high catalytic activity is kept. Therefore, the catalyst is a catalyst product for efficient carbonylation for the preparation of acetic acid, which has the advantages of stable property, and simple product preparation.

Description

technical field [0001] The invention relates to a supported catalyst for producing acetic acid in liquid and solid phases by methanol carbonylation. Background technique [0002] In the acetic acid production process, methanol carbonylation is one of the most important methods, which uses methanol (CH 3 OH) and carbon monoxide (CO) as raw materials, and precious metals such as rhodium (Rh) or iridium (Ir) as catalysts. In terms of technology, there are homogeneous catalysts and supported catalysts. Since the latter is supported on the corresponding carrier, it can overcome the disadvantages of the former that easily lead to the precipitation and deactivation of the noble metal active component, and then cause the loss of the noble metal catalyst. According to the environment in which the catalyst is located in the reaction process, the catalytic production of acetic acid with a supported catalyst can be divided into a gas-solid phase method and a liquid-solid phase method....

AI Technical Summary

Problems solved by technology

However, since the carrier polyvinylpyridine softens and decomposes to a certain extent under the high temperature and high pressure conditions of the catalytic reaction, its stability is poor, specifically, except that the degree of severity is better than that of the homogeneous catalyst without carrier , the problem of loss or deactivation of precious metals still occurs from time to time

Images