Two types of catalysts for synthesizing methyl chlorosilane and preparation method thereof

Abstract

The invention discloses two types of catalysts for synthesizing methyl chlorosilane and a preparation method thereof. The two types of catalysts are prepared by taking metal copper powder as a raw material through the steps of oxidizing to remove surface impurities, deeply oxidizing to change substance structures, partially reducing and regulating product constituents, the catalyst I comprises the following constituents in percentage by weight: 15-30% of metal copper, 20-30% of cuprous oxide and 40-65% of copper oxide, and is used during normal reaction after a synthesis reaction is started, and the catalyst II comprises the following constituents in percentage by weight: 50-65% of metal copper, 25-35% of cuprous oxide and 5-20% of copper oxide, and is used during driving starting reaction in the early stage of synthesis reaction. The method disclosed by the invention has the advantages of low energy consumption, high efficiency, environmental friendliness, effectively reduced production cost, and more stable and complete reduction reaction; meanwhile, the prepared copper catalysts have the characteristics of high catalytic activity and selectivity, strong raw material adaptability and good overall indicators.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a copper catalyst used for synthesizing methylchlorosilane and a preparation method thereof. Background technique [0002] There are many ways to synthesize methylchlorosilane, mainly direct synthesis method, thermal condensation method, hydrosilation addition method, metal organic compound method, and redistribution method. Among them, the direct synthesis method has become the most commonly used method in the production of methylsilane in the world so far because of its advantages of easy availability of raw materials, simple process, no need for solvents, high space-time yield, and easy realization of continuous production. Space-time yield, also known as space-time yield or space-time yield, refers to the amount of a certain product that can be obtained per unit volume (or mass) of catalyst per unit time under given reaction conditions. It is one of the signs to...

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Problems solved by technology

Although its catalytic activity and storage stability have been significantly improved, the catalyst still has defects in many aspects such as selectivity and preparation process, such as the content of copper oxide is not high enough, resulting in insufficient comprehensive performance such as activity and selectivity. Good, and the energy consumption is high during the preparation process, the dehydration time is long, and the reduction reaction is not stable enough

Although this patent has realized the transition from elemental copper to oxide, and has increased selectivity and activity by more than 10% and 20% respectively, it still has the following disadvantages: A. Since the raw material for production is crystalline copper sulfate, When used, it needs to be dissolved and then dehydrated into powder at high temperature, so it needs to consume a lot of energy; B. The reduction process in production involves the production of sulfur dioxide, post-treatment and discharge, which is not conducive to solving the hidden dangers of environmental pollution from the root. , and there are problems of consumption of ammonia and water resources, by-product ammonium bisulfite and narrow application fields

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