Separation purification process of dimethyl carbonate

A dimethyl carbonate and process technology, which is applied in the field of separation and purification of dimethyl carbonate, can solve the problems of energy recovery and utilization, separation, and methanol back-mixing in the process, so as to avoid methanol back-mixing and save energy significantly , The effect of simplifying the process

Active Publication Date: 2019-10-25
TAIYUAN UNIV OF TECH
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Problems solved by technology

However, the shortcomings of the above two patents are (1) the separation of a small amount of by-products methylal (DMM) and methyl formate (MF) in the crude product is not considered; (2) the process does not consider the recovery of energy, and the energy consumption is relatively low. Higher; (3) Methanol in the tower is prone to back-mixing

Method used

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  • Separation purification process of dimethyl carbonate

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Experimental program
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Effect test

Embodiment 1

[0040] Raw material composition ratio methanol: water: DMC: DMM: MF is 62.5: 12.5: 23.5: 0.9: 1.1, and the ratio of methanol and DMC after deducting water is 72.7: 27.3.

[0041] First, the raw material is added to the middle and lower part of the extractive distillation tower 1, and the temperature of the raw material is controlled at 60°C; the temperature of the inlet of the extractant into the extractive distillation tower 1 is controlled at 50°C. The absolute operating pressure of extractive distillation column 1 is 150kPa, the top reflux ratio is 11, the top operating temperature is 47°C, and the mass fraction of DMM and MF in the top gas phase stream is over 93%. The upper material stream produces the liquid phase stream of the side line, the production temperature is 89°C, the DMC mass fraction is 79%, the water mass fraction is 20.8%, and trace light components; the lower material stream produces the gas phase stream of the side line, and the production The temperature...

Embodiment 2

[0046] Raw material composition ratio methanol: water: DMC:DMM:MF is 58.4:14.3:25.2:1.1:1, the ratio of methanol and DMC after deducting water is 69.86:30.14.

[0047] First, the raw material is added to the middle and lower part of the extractive distillation tower 1, and the temperature of the raw material is controlled at 60° C.; the inlet temperature of the extractant into the extractive distillation tower 1 is controlled at 40° C. The absolute operating pressure of the extraction tower and the distillation tower is 150kpa, the reflux ratio at the top of the tower is 13, the operating temperature at the top of the tower is 46°C, and the mass fraction of DMM and MF in the gas phase stream at the top of the tower is over 95%. The upper material stream produces the liquid phase stream of the side line, the production temperature is 88°C, the DMC mass fraction is 79.9%, the water mass fraction is 20%, and trace light components; the lower material stream produces the gas phase ...

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Abstract

The invention discloses a separation purification process of dimethyl carbonate. The separation purification process uses a crude product of a coal-prepared glycol by-product or a dimethyl carbonate crude product synthesized by methanol oxidative carbonyl as a raw material, and a separation device comprises an extractive distillation column with a material stream extraction side line, two phase splitters, a methanol distillation column, a dimethyl carbonate dehydration tower with a material stream extraction side line, a plurality of condensers and a plurality of reboilers; and the refined dimethyl carbonate, a light component product containing methylal and methyl formate and methanol are finally obtained through the continuous operation steps of the three separation units of extractive distillation-methanol distillation-dimethyl carbonate dehydration and an extraction agent recycling unit. The purification process of the dimethyl carbonate is high in applicability, simple in processflow and obvious in energy-saving effect through heat coupling.

Description

technical field [0001] The invention belongs to a separation and purification process of dimethyl carbonate, and specifically relates to the purification and separation application of dimethyl carbonate in the crude product of coal-based ethylene glycol by-product or the crude product of dimethyl carbonate synthesized by methanol liquid-phase oxidative carbonylation. Background technique [0002] Dimethyl carbonate (DMC) is a green fine chemical. As a non-toxic solvent, it is widely used in the paint industry. It can be used as a solvent for lithium battery electrolytes, can replace phosgene as a carbonylation reagent, and can also replace methyl tert-butyl ether (MTBE) as an oil additive. [0003] At present, the synthesis methods of DMC mainly include: transesterification method and methanol oxidative carbonylation method; at the same time, with the large-scale promotion and implementation of coal-to-ethylene glycol process in recent years, the recovery and purification of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/00C07C68/08C07C69/96
CPCC07C68/00C07C68/08C07C69/96Y02P20/10
Inventor 郑华艳李忠王玉春张国强周龙
Owner TAIYUAN UNIV OF TECH
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