Preparation process of flaky pure copper powder catalyst

Abstract

The invention relates to a preparation process of a flaky pure copper powder catalyst. The preparation process comprises the steps of: preparing copper cuttings, grinding the copper cuttings, and grading flaky copper to prepare the flaky pure copper powder catalyst. As any element harmful to an environment is not introduced to the whole process course, the harmful impurity content is low, and the stability of product quality is good; the catalytic characteristic is obviously better than that of common composite copper powder, so that the effect of synthesizing a metal catalytic system by an organosilicone monomer is improved, organosilicone monomer synthesis and the space time yield of fluidized beds are increased, the synthetic reaction period is prolonged, the preparation efficiency of dimethyldichlorosilance is improved, the cost is reduced, and the benefits are created; and promoters, such as Zn, Sn and P are used so that the synthetic reaction of the organosilicone monomer can be flexibly regulated according to impurity conditions in the fluidized beds and contact compositional variation, and the problems of low activity and selectivity of the composite copper powder and deteriorated catalytic performances as reaction goes on are solved.

Description

technical field [0001] The invention relates to the field of catalysts used for synthesizing organosilicon monomers, in particular to a preparation process of flake-shaped pure copper powder catalysts. Background technique [0002] Methylchlorosilane, also known as organosilicon monomer, is obtained by chemical reaction of metal silicon and methyl chloride in a fluidized bed under the condition of adding catalyst and heating, and its synthesis reaction belongs to gas-solid-solid multiphase contact catalysis Exothermic reaction, the reaction mechanism is complex, in addition to the main reaction, a variety of side reactions exist simultaneously. There are many factors affecting the reaction process, including fluidized bed structure, raw silicon powder, methyl chloride, catalyst, process parameters, etc., especially the adaptability of the catalyst plays a very important role in the synthesis reaction. [0003] As we all know, copper powder is the earliest classic catalyst u...

AI Technical Summary

Problems solved by technology

The oxygen content of the composite copper powder prepared by this method is relatively high, the surface of the particles is not developed enough, and the reactivity is low. At the same time, due to the fixed content of Zn, Sn and other elements in the composite copper powder, as the synthesis reaction of the organosilicon monomer proceeds, the fluidized bed The continuous accumulation of Zn, Sn and other elements in the contact body leads to high content of Zn and Sn elements in the contact body, a significant increase in catalytic side reactions, resulting in a continuous decline in the selectivity of dimethyldichlorosilane, deterioration of the synthesis reaction effect, and the start-up cycle of the synthesis reaction. shortened, less efficient