Efficient and safe method for synthesizing carbonic ester by using oxidative carbonyl

Abstract

The invention discloses an efficient and safe method for synthesizing carbonic ester by using oxidative carbonyl. The method comprises the steps of oxidative glycosylation reaction, flash separation, gas-liquid separation and product separation. The method can be used for overcoming the defects of heterogeneous catalytic system, complex process, poor recyclability and potential safety hazard of reaction process in the prior art; a novel process device is adopted; the feeding mole ratio of carbon monoxide (CO) to oxygen (O2) can be controlled; CO and O2 are taken as the reaction raw material gases; the catalyst solution is recyclable; a catalyst system applied to the reaction is a catalyst solution prepared from a solvent and a complex which is formed by homogeneous active components and ligands. The method has the advantages that the process is efficient, safe and simple, and the catalyst solution is easily recyclable; and the method has a good prospect of industrial application.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to an efficient and safe method for oxidative carbonyl synthesis of carbonate. Background technique [0002] Carbonate (dimethyl carbonate, diethyl carbonate, etc.) is an important green organic chemical raw material, and its molecule contains a variety of functional groups, which can be synthesized by reactions such as oxidative carbonylation. It can replace highly toxic phosgene and diethyl sulfate as a reaction solvent to react with various alcohols, phenols and esters to synthesize a series of high value-added downstream products. Therefore, the research on its synthetic method has gradually attracted people's attention. The traditional synthesis method is to react with alcohol and phosgene, the reactants of this method are highly toxic, and the HCl produced will severely corrode the reaction equipment. The transesterification method uses various carbonates and al...

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Problems solved by technology

[0003] In the above-mentioned process method, it is not mentioned that in this system, the feed gas CO is in the O 2 The concentration in the concentration has the problem of potential safety hazard in the explosion limit range, while CO and O 2 The feed ratio has a great influence on the conversion rate, which restricts the development of the process to a certain extent; at the same time, there are still problems in the separation, recovery and corrosion of the catalyst in the slurry bed reactor, which increases equipment investment and operation. Cost; the amount of liquid held by the tubular reactor is small, and the gas-liquid reaction mass transfer surface is small, which makes the large-scale production device larger; the gas-phase method fixed-bed reactor avoids the separation problem of the catalyst, but it adopts the palladium catalyst. The cost is high, and toxic ethyl nitrite is introduced through the NO circulation medium, which is restricted by safety and environmental protection; although noble metal and monovalent copper catalysts increase the reactivity to a certain extent, the noble metal Pd system, Rh system or Ir system The cost is high, monovalent copper has poor solubility and corrosion problems, and divalent copper complex catalysts have shortcomings such as separation and recovery.

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