High-molecular complex as catalyst for synthesizing dimethyl carbonate and its preparing process and application

Abstract

A catalyst for synthesizing dimethyl carbonate is a complex prepared from copper halide and the high-molecular compound containing one or more heteroatoms (N, O, S, etc). Said dimethyl carbonate is synthesized through adding methanol, catalyst, CO and O2 to high-pressure reactor, and reacting at 90-160 deg.C and 1-5 MPa. The conversion rate of methanol is higher than 35%. The selectivity of target product is higher than 99.5%. Said catalyst features high activity, selectivity and stability, and low corrosion.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a polymer complex catalyst for synthesizing dimethyl carbonate by methanol liquid-phase oxidative carbonylation and a preparation and use method thereof. Background technique [0002] Dimethyl carbonate (DMC) is a new type of organic chemical raw material with high added value, and is known as a "green" chemical product and a "new building block" for chemical synthesis. Because of its high activity, it can replace highly toxic and carcinogenic phosgene and dimethyl sulfate as carbonylation reagents, methylation reagents, etc. to manufacture many valuable chemical products, and is widely used in high-performance resins, pharmaceuticals, and pesticide intermediates It can replace various toxic solvents as solvents for paints and paints; because of its high oxygen content, it also has a very broad prospect in replacing methyl tert-butyl ether (MTBE) as a gasoli...

AI Technical Summary

Problems solved by technology

However, cuprous chloride (CuCl) is highly corrosive to the reaction device, and anti-corrosion materials such as glass or enamel lining must be added to the inner wall of the reactor, making it difficult to realize a large-scale device.

In addition, due to the extremely poor solubility of CuCl in the reaction system, a high concentration of CuCl must be used in the Enichem process to obtain a sufficient reaction rate

Chinese patent CN1197792A (1998) uses CuCl as the main catalyst, magnesium chloride, calcium chloride, etc. as auxiliary agents to prepare a composite catalyst modified by alkaline earth metal salts, which improves the solubility of cuprous chloride in the reaction solution to a certain extent. Improves catalyst activity, but does not solve the problem of corrosion to equipment

Chinese patent CN1333086A (2002) has announced to take CuCl as main catalyst, and the composite catalyst that nitrogen-containing heterocyclic compound or macromolecule complex forms, has further improved the dissolubility of cuprous chloride in reaction solution, has improved Catalyst activity and selectivity, and reduce the corrosion of the reaction system to the equipment, but the technical problems such as the large amount of catalyst used and the stability still need to be solved