Technical method for associated producing carbonic allyl ester, methyl carbonate, and propylene glycol

A technology of propylene carbonate and dimethyl carbonate, which is applied in the process field of joint production of propylene carbonate, dimethyl carbonate and propylene glycol, can solve the problems of incapability of comprehensive utilization and waste of excess heat, save intermediate storage equipment, improve Separation accuracy and yield, the effect of simplifying the production process

Inactive Publication Date: 2007-12-26
SHANDONG SHIDA SHENGHUA CHEM GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process must first use the two-stage reaction plus tower still distillation refining separation process to generate propylene carbonate, and then send it to the reactive distillation tower to transesterify with methanol after entering the storage tank. Two sets of devices and corresponding operating rooms need to be built separately. DCS control system, frame and other supporting facilities, the excess heat generated by each device cannot be comprehensively utilized, resulting in waste, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1, propylene oxide and potassium iodide catalyst are according to mass ratio 4: 1, are sent into reaction preheater after being metered by metering pump and are heated to reaction required temperature 180 ℃ and enter the top of the first reactor, and carbon dioxide is sent to the top of first reactor with delivery pump It is sent to the carbon dioxide buffer tank, and then sent to the first reactor, and the excess carbon dioxide in the reaction system is controlled to balance the pressure in the reactor, and the excess CO 2 React with propylene oxide catalyst at 180°C and 6.5Mpa to generate crude propylene carbonate and release a lot of heat. The reaction residence time is 2 hours. It enters the high-temperature and high-pressure circulation pump from the bottom of the reactor, removes the excess heat generated during the reaction, and sends it to the reaction preheater in the form of circulating liquid to exchange heat with propylene oxide and catalyst. The ...

Embodiment 2

[0018] Embodiment 2, propylene oxide and potassium iodide catalyst are according to mass ratio 3: 1, are sent into reaction preheater after being metered by metering pump and are heated to reaction required temperature 185 ℃ and enter the top of the first reactor, and carbon dioxide is sent to the top of first reactor with delivery pump It is sent to the carbon dioxide buffer tank, and then sent to the first reactor, and the excess carbon dioxide in the reaction system is controlled to balance the pressure in the reactor, and the excess CO 2 React with propylene oxide catalyst at 185°C and 5.5Mpa to generate crude propylene carbonate and release a lot of heat. The reaction residence time is 1.5 hours. The crude product propylene carbonate is concentrated and evaporated under reduced pressure, and the obtained evaporative cooling liquid is the qualified propylene carbonate refined product with a content of 99.5% (by weight).

[0019] Propylene carbonate, methanol, and potassium...

Embodiment 3

[0021] Embodiment 3, propylene oxide and potassium iodide catalyst are according to mass ratio 2: 1, are sent into reaction preheater after being metered by metering pump and are heated to reaction required temperature 190 ℃ and enter the top of the first reactor, and carbon dioxide is sent to the top of first reactor with delivery pump It is sent to the carbon dioxide buffer tank, and then sent to the first reactor, and the excess carbon dioxide in the reaction system is controlled to balance the pressure in the reactor, and the excess CO 2 React with propylene oxide catalyst at 190°C and 6.0Mpa to generate crude propylene carbonate and release a lot of heat. The reaction residence time is 1.5 hours. The crude product propylene carbonate is concentrated and evaporated under reduced pressure, and the obtained evaporative cooling liquid is qualified propylene carbonate refined product, and the content is 99.0% (by weight).

[0022] Propylene carbonate, methanol, and potassium m...

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Abstract

This invention discloses a process for combined production of propylene carbonate, dimethyl carbonate and propylene glycol. The method utilizes propylene oxide, CO2 and methanol as the raw materials, and adopts two-step reaction to produce propylene carbonate, dimethyl carbonate and propylene glycol. The method avoids propylene carbonate refinery process; catalyst recovery process and propylene carbonate storage apparatus. The method utilizes a novel thin film evaporator to separate and refine crude propylene carbonate and catalyst, and thus increase the separation precision and productivity. The method utilizes a set of platform framework and a DCS control chamber to realze continuous operation of the whole process, and is stable and reliable. The produced propylene carbonate, dimethyl carbonate and propylene glycol can reach pharmaceutical grade purity.

Description

Technical field: [0001] The invention relates to a process for the joint production of propylene carbonate, dimethyl carbonate and propylene glycol, in particular to a method for producing the above-mentioned substances by using propylene oxide, carbon dioxide and methanol as raw materials. Background technique: [0002] Dimethyl carbonate is a non-toxic chemical product with excellent performance. It is mainly used as a raw material for the production of polycarbonate, polyurethane, and pharmaceuticals, as a reagent for chemical reaction methylation and carbonylation, and as a gasoline additive. Clean and safe green solvent with a very wide range of uses. [0003] The methods for preparing dimethyl carbonate mainly include: phosgene method, oxidative carbonylation method, transesterification method of ethylene carbonate or propylene carbonate and methanol, urea methanolysis method, etc. Because phosgene is highly toxic and corrosive to equipment and produces "three wastes"...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/96C07C68/04C07C31/20
CPCY02P20/141
Inventor 杜寿考郭天明
Owner SHANDONG SHIDA SHENGHUA CHEM GROUP
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