Preparation of organic/inorganic nano media pores hybridization catalyst utilized for synthesizing methyl carbonate as well as its application

Abstract

A nano-class organic / inorganic mesoporous hybridizing catalyst for preparing dimethyl carbonate by liquid-phase oxidization and carbonylation of methanol contains copper halides and the carrier whichis a nano-class organic / inorganic mesoporous hybridizing material with specially treated surface for effectively dispersing the copper halides on it. The said dimethyl carbonate is prepared from methanol, catalyst, CO and O2 through reaction at 110-140 deg.C and 2.0-5.0 MPa. Its advantages are high selectivity, activity and stability, low corrosion and cyclic use of catalyst.

Description

technical field [0001] The invention belongs to the preparation and use method of an organic / inorganic nanometer mesoporous hybrid composite catalyst used for methanol liquid-phase oxidative carbonylation to synthesize dimethyl carbonate. Background technique [0002] As a new type of organic chemical raw material with high added value, the synthesis and application of dimethyl carbonate (DMC) has attracted widespread attention in recent years. Dimethyl carbonate 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, dimethyl sulfate as a carbonylation reagent, methylation Reagents and other valuable chemical products are widely used in the synthesis of high-performance resins, pharmaceuticals, and pesticide intermediates; they can replace various toxic solvents as solvents for paints and paints; Butyl ether (MTBE) also has a very broad prospect as a gasol...

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 Eni Chem 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

U.S. Patent US5093513 (1992) announced the use of CuCl 2 As the main catalyst, via (EtO) 3 Si(CH 2 ) 3 NH 2 or (EtO) 3 Si(CH 2 ) 3 NHCH 2 CH 2 NH 2 The surface-modified ordinary amorphous silica carrier-supported composite hybrid catalyst is used for the oxidative carbonylation of methanol in liquid phase to synthesize dimethyl carbonate, which makes the catalyst have both the advantages of homogeneous and heterogeneous catalysts in practical use, but it needs to be pointed out However, the above-mentioned catalytic system also has problems such as low reaction efficiency and difficulty in repeated use.

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