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Reaction system and process for synthesizing dimethyl carbonate through liquid-phase oxidative carbonylation of methanol

A technology of dimethyl carbonate and oxidative carbonylation, which is applied in the field of the reaction system of methanol liquid-phase oxidative carbonylation to synthesize dimethyl carbonate, can solve the problems of reduced yield of dimethyl carbonate and inability to fully mix, and achieves guaranteed Effects of reaction rate, production cost reduction, and energy saving

Pending Publication Date: 2021-03-12
NANJING YANCHANG REACTION TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a kind of reaction system and technique of methanol liquid-phase oxidative carbonylation synthetic dimethyl carbonate, to solve the prior art, due to the mixed gas of methanol and carbon monoxide and oxygen in the oxidative carbonylation reactor interior Can not be mixed well, resulting in the problem of lower yield of dimethyl carbonate

Method used

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  • Reaction system and process for synthesizing dimethyl carbonate through liquid-phase oxidative carbonylation of methanol

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Fill a sufficient amount of methanol and a corresponding proportion of catalyst into the liquid phase storage tank 12, connect the gas phase feed pipeline 11 to the gas source containing 150L of carbon monoxide and oxygen mixed gas, and the molar ratio of carbon monoxide and oxygen in the gas source 3-50:1, start the system, set the system temperature to 115°C, set the pressure to 0.8MPa, transport methanol and catalyst to the inside of the reactor 3, and at the same time, transport the mixed gas of carbon monoxide and oxygen through the gas phase feed pipeline 11 to the inside of the micro-interface generator 2;

[0055] The micro-interface generator 2 breaks the mixed gas of carbon monoxide and oxygen into micro-bubbles on a micron scale, and releases the micro-bubbles into the inside of the reactor 3, so that the mixed gas of carbon monoxide and oxygen is fully mixed with methanol in the state of micro-bubbles. Contact, and carry out oxidative carbonylation reaction....

Embodiment 2

[0059] Fill a sufficient amount of methanol and a corresponding proportion of catalyst into the liquid phase storage tank 12, connect the gas phase feed pipeline 11 to the gas source containing 150L of carbon monoxide and oxygen mixed gas, and the molar ratio of carbon monoxide and oxygen in the gas source 3-50:1, start the system, set the system temperature to 120°C, set the pressure to 0.9MPa, transport methanol and catalyst to the inside of the reactor 3, and at the same time, transport the mixed gas of carbon monoxide and oxygen through the gas phase feed pipeline 11 to the inside of the micro-interface generator 2;

[0060] The micro-interface generator 2 breaks the mixed gas of carbon monoxide and oxygen into micro-bubbles on a micron scale, and releases the micro-bubbles into the inside of the reactor 3, so that the mixed gas of carbon monoxide and oxygen is fully mixed with methanol in the state of micro-bubbles. Contact, and carry out oxidative carbonylation reaction....

Embodiment 3

[0064] Fill a sufficient amount of methanol and a corresponding proportion of catalyst into the liquid phase storage tank 12, connect the gas phase feed pipeline 11 to the gas source containing 150L of carbon monoxide and oxygen mixed gas, and the molar ratio of carbon monoxide and oxygen in the gas source 3-50:1, start the system, set the system temperature to 125°C, set the pressure to 1MPa, transport methanol and catalyst to the inside of the reactor 3, and at the same time, transport the mixed gas of carbon monoxide and oxygen to the Inside the microinterface generator 2;

[0065]The micro-interface generator 2 breaks the mixed gas of carbon monoxide and oxygen into micro-bubbles on a micron scale, and releases the micro-bubbles into the inside of the reactor 3, so that the mixed gas of carbon monoxide and oxygen is fully mixed with methanol in the state of micro-bubbles. Contact, and carry out oxidative carbonylation reaction.

[0066] The oxidative carbonylation reactio...

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Abstract

The invention provides a reaction system and process for synthesizing dimethyl carbonate through liquid-phase oxidative carbonylation of methanol. The system comprises: a feeding unit used for storingand conveying mixed gas of carbon monoxide and oxygen and a methanol liquid; a reaction kettle internally provided with a micro-interface generator, connected with the feeding unit and used as a place for oxidative carbonylation reaction; a gas-liquid separation unit connected with the reaction kettle and used for carrying out gas-liquid separation on the oxidative carbonylation reaction product;and a rectifying tower connected with the gas-liquid separation unit and used for rectifying the crude product dimethyl carbonate obtained by gas-liquid separation. According to the reaction system and process for synthesizing dimethyl carbonate through liquid-phase oxidative carbonylation of methanol, the problem that in the prior art, the yield of dimethyl carbonate is reduced due to the fact that methanol and mixed gas of carbon monoxide and oxygen cannot be fully mixed in an oxidative carbonylation reaction kettle is solved.

Description

technical field [0001] The invention relates to the technical field of organic compound synthesis, in particular to a reaction system and process for synthesizing dimethyl carbonate by methanol liquid-phase oxidative carbonylation. Background technique [0002] As people pay more and more attention to environmental issues, all countries in the world have put forward higher requirements for the production of chemicals, and the development of environmentally friendly green chemicals has become an inevitable trend of development. Dimethyl carbonate (DMC), as a slightly toxic and environmentally friendly green chemical product, can be used as a raw material for organic synthesis to replace phosgene, methyl chloroformate and dimethyl sulfate as carbonylation, methylation and formazan Oxygenating reagents can also be used as gasoline, diesel additives and solvents. [0003] Using methanol, carbon monoxide and oxygen as raw materials to directly oxidize carbonyl to synthesize DMC ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/01C07C68/08C07C69/96B01J19/00
CPCC07C68/08B01J19/0093C07C69/96
Inventor 张志炳周政张锋李磊孟为民王宝荣杨高东罗华勋杨国强田洪舟
Owner NANJING YANCHANG REACTION TECH RES INST CO LTD
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