Catalyst used for catalytic synthesizing dimethyl carbonate directly from methanol and carbon dioxide and preparation and using method thereof

Abstract

The invention discloses a direct catalytic synthesis catalyst to prepare dimethyl carbonate from methanol and carbon dioxide and the preparation and application methods of the catalyst. The catalyst of the invention consists of transitional metal soluble salt, promoter and carrier, with the weight ration from 0.01to 0.5: 0.01to 0.1:1. The preparation method is that: (1) the carrier is impregnated into the transition metal soluble salt solution; (2) the promoter is added into the solution, which is stirred in room temperature, ultrasonically dispersed and stored stationarily in room temperature; (3) the solution is dried, sintered, reduced and activated to produce catalyst. The application method is that: the catalyst is put in high pressure reactor or micro reaction device with the temperature of the catalyst bed controlled between 90 degrees centigrade to 140 degrees centigrade and the reaction pressure between 0.6 to 3.0MPa. The catalyst is applicable in direct catalytic synthesis to prepare dimethyl carbonate from methanol and carbon dioxide. The raw material sources are rich, the cost is low, the preparation method is simple and the operation is easy. The catalyst is easily separated from the products, the reaction conditions are mild and the catalyst can be used repeatedly. The catalyst has high activity and selectivity.

Description

technical field [0001] The invention relates to a catalyst for synthesizing dimethyl carbonate, a preparation method and a use method. Background technique [0002] Dimethyl carbonate (DMC) is an important organic synthesis intermediate, known as the "new template" of organic synthesis, which can replace highly toxic or carcinogenic phosgene, methyl chloroformate, dimethyl sulfate and formazan Substances such as base chloride are used as carbonylation, methylation and methoxylation reagents, and can be used as environmentally friendly intermediates and starting materials for organic synthesis. In recent years, DMC has been widely used in the preparation of high-performance resins, solvents, dye intermediates, pharmaceutical additives, food preservatives, fuel additives and other fields, and has attracted increasing attention. At present, there are a large number of patents published on the production and application of DMC at home and abroad, and there has been a certain sc...

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Problems solved by technology

Catalytic systems used, including alkaline earth metal alkoxylates, bases, acetates, organometallic tin, titanium alkoxylates, supported metals, zirconium dioxide, ceria, organotin and ionic liquids class, etc., but the main problem is that the conversion rate of the reactant and the selectivity of the target product are low, and the reaction process is difficult to control, so it is difficult to realize industrial production