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Method of distillation and ester exchange reaction for producing dimethyl carbonate and dihydroxyl alcohols

A technology of dimethyl carbonate and reactive distillation, which is applied in the preparation of organic carbonates and organic chemistry, can solve the problems of single-pass conversion rate limitation and high requirements for the pretreatment of reaction raw materials, and achieve the goal of reducing energy consumption and increasing single-pass conversion rate Effect

Inactive Publication Date: 2006-02-15
上海衡和环保新材料科技有限公司
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Problems solved by technology

The single pass conversion rate and yield of this method are limited by the equilibrium conversion rate of the transesterification reaction, and the requirements for the pretreatment of the reaction raw materials are relatively high

Method used

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  • Method of distillation and ester exchange reaction for producing dimethyl carbonate and dihydroxyl alcohols

Examples

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Embodiment 1

[0031] 1. Catalyzed esterification reaction of ethylene oxide and carbon dioxide to generate ethylene carbonate

[0032] The gas obtained from the oxidation of ethylene contains 1.5 mol% of ethylene oxide and 7.5 mol% of carbon dioxide. The temperature is 45°C. The flow rate of 100kg / h passes through a packed tower with a bed height of 1.2 meters. The ethylene carbonate absorbing liquid at 45°C It flows down from the top of the tower at a flow rate of 75kg / h, contacts with the gas countercurrently, and operates at a pressure of 1.8MPa. Ethylene oxide and carbon dioxide are absorbed into the absorption liquid. Analysis shows that the absorption rate of ethylene oxide is over 99.5%, and the absorption rate of carbon dioxide is over 90%.

[0033] Mix the above absorbing liquid with the catalyst tetraethylammonium bromide in a reactor, and heat it to 150°C, and the operating pressure is 8MPa. After 45 minutes of reaction, the conversion rate of ethylene oxide is above 99%, and no ...

Embodiment 2

[0044] 1. Catalyzed esterification reaction of propylene oxide and carbon dioxide to generate propylene carbonate

[0045] Containing 1.5mol% of propylene oxide and 7.5mol% of carbon dioxide in the gas obtained from the oxidation of propylene, the temperature is 35°C, and the flow rate of 100kg / h passes through a packed tower with a bed height of 1.2 meters, and the propylene carbonate absorption solution at 35°C is The flow rate of 75kg / h flows down from the top of the tower and contacts with the gas countercurrently, the operating pressure is 1.6MPa, and the propylene oxide and carbon dioxide are absorbed into the absorption liquid. Analysis shows that the absorption rate of propylene oxide is more than 99.5%, and the absorption rate of carbon dioxide is more than 90%.

[0046] Mix the above absorbing liquid with the catalyst tetrapropylammonium bromide in the reactor, and heat it to 150°C, the operating pressure is 8MPa, after 45 minutes of reaction, the conversion rate of ...

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Abstract

The invention discloses a method of distillation and ester exchange reaction for producing dimethyl carbonate and dihydroxyl alcohols comprising the following steps, counterflow contacting cyclic carbonates absorbent with mixed gas containing alkylene oxide and carbon dioxide in an absorption column, reacting alkylene oxide with carbon dioxide to obtain cyclic carbonate, the cyclic carbonate synthesized liquid entering a rectifying tower, the cyclic carbonate on top of the tower entering an reaction rectifying tower through pipe lines, carrying out ester exchange reaction with menthol at the presence of ester exchange catalyst, obtaining dimethyl carbonate and dibastic alcohol.

Description

technical field [0001] The present invention relates to a process for dimethyl carbonate and diols. Background of the invention [0002] Dimethyl carbonate (DMC for short, the same below) is a relatively basic organic chemical raw material with very little toxicity (it was registered as a "non-toxic chemical" in Europe in 1992). Due to the active CH in its molecular structure 3 -, CH 3 O-, CH 3 CO-, -CO-, so it has a variety of reactive properties, and can replace highly toxic dimethyl sulfate, methyl chloride, methyl chloroformate and phosgene in many chemical reaction occasions as methylation, methoxycarbonylation And the carbonylating reagent reacts, and the by-product is only carbon dioxide or methanol. Therefore, as a green and clean chemical raw material, DMC is widely used in industrial fields such as pesticides, medicines, plastics, dyes, electronic chemicals, and feed additives. In addition, as a new type of fuel additive, DMC can also be used as an antiknock a...

Claims

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Application Information

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IPC IPC(8): C07C69/96C07C68/06C07C31/20
Inventor 田恒水朱云峰刘纪昌郝晔王贺玲黄河
Owner 上海衡和环保新材料科技有限公司
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