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Method for separating dimethyl carbonate and methanol through pressure-swing distillation of heat pump, and apparatus thereof

A technology of dimethyl carbonate and pressure swing rectification, applied in chemical instruments and methods, purification/separation of carbonate/haloformate, preparation of organic compounds, etc., can solve problems such as large energy consumption, and achieve The effect of efficient separation, cost reduction and energy consumption reduction

Inactive Publication Date: 2014-03-12
YASHENTECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the disadvantage of high energy consumption in the existing pressure swing rectification separation process of dimethyl carbonate-methanol, the present invention provides a method and device for heat pump pressure swing rectification separation of dimethyl carbonate and methanol and methyl carbamate , dimethyl carbonate and methanol separation device

Method used

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  • Method for separating dimethyl carbonate and methanol through pressure-swing distillation of heat pump, and apparatus thereof
  • Method for separating dimethyl carbonate and methanol through pressure-swing distillation of heat pump, and apparatus thereof
  • Method for separating dimethyl carbonate and methanol through pressure-swing distillation of heat pump, and apparatus thereof

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Embodiment 1

[0129] refer to image 3 As shown, the heat pump pressure swing rectification device for separating dimethyl carbonate and methanol in this embodiment includes an atmospheric rectification tower 100 and a pressurized concentration tower 200 .

[0130] The middle part of described atmospheric rectification tower 100 is provided with raw material inlet 61, is used to pass into the mixed raw material that comprises DMC and MeOH (the mixed raw material here is the raw material of main component with DMC and MeOH), in described atmospheric rectification tower At 100, an atmospheric azeotropic vapor material extraction port 101 for extracting DMC-MeOH atmospheric azeotropic vapor material is provided at the top of the tower, and a methanol-rich solution extraction port 103 for extracting methanol-rich solution is opened at the bottom of the tower. A reboiler 21 is provided at the bottom of the atmospheric rectification tower 100, wherein the bottom of the atmospheric distillation to...

Embodiment 2

[0154] The heat pump pressure swing rectification separation device of dimethyl carbonate and methanol in this embodiment is roughly the same as the heat pump pressure swing rectification separation device technical scheme of dimethyl carbonate and methanol in Example 1, the difference is that in the normal pressure An intermediate tank is respectively arranged between the reboiler 21 of the rectification column 100 and / or the reboiler 22 of the pressurized concentration tower 200 and the corresponding first reflux tank 31 and / or the second reflux tank 32, thereby further Using the latent heat of vaporization of the condensed DMC-MeOH atmospheric pressure azeotropic steam material or DMC-MeOH pressurized azeotropic steam material to realize efficient energy circulation and further strengthen the heat pump pressure swing rectification to separate dimethyl carbonate and methanol the stability of the device.

[0155] The specific structure is combined with reference Figure 4 sh...

Embodiment 3

[0161] In order to obtain a higher-purity dimethyl carbonate solution, the higher-purity dimethyl carbonate solution that can be extracted from the 200 tower kettles of the pressurized concentration tower can be passed into a product refining tower for rectification and purification, thereby obtaining higher pure dimethyl carbonate solution.

[0162] The heat pump pressure swing rectification separation device for dimethyl carbonate and methanol in this implementation is set up a product refining tower on the basis of the heat pump pressure swing rectification separation device for dimethyl carbonate and methanol in embodiment 1 and embodiment 2 . The specific structure can refer to Figure 5 shown.

[0163] The middle part of the product refining tower 300 is provided with a raw material inlet 63 connected to the enriched dimethyl carbonate extraction port 203 of the pressurized concentration tower 200 . The refining tower steam material extraction port 301 for extracting ...

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Abstract

The invention provides a method for separating dimethyl carbonate and methanol through pressure-swing distillation of heat pump, and an apparatus thereof. In the dimethyl carbonate and methanol through pressure-swing distillation of the heat pump, an atmospheric azeotropic steam material obtained from the top of an atmospheric rectification tower is supercharged and heated by a heat pump compressor, and is introduced to a reboiler at the bottom of the atmospheric rectification tower as a heat source, so a liquid in the atmospheric rectification tower is heated, and the self-condensation of the atmospheric azeotropic steam material is completed. Compared with traditional atmospheric azeotropic steam material condensation through using cooling water and kettle liquid heating realized through an extra external heat source, the method in the invention properly improves the temperature and the pressure of an atmospheric azeotropic steam through the heat pump compressor to make the atmospheric azeotropic steam realize the kettle liquid heating and the reasonable and effective energy cycle as a heat source; and the cost generated by the pump heat compressor is far lower than the cost of traditional cooling water and the external heat source, so a good economic benefit is generated.

Description

technical field [0001] The invention relates to a mixture purification process, in particular to a method and device for separating dimethyl carbonate and methanol by heat pump pressure swing rectification. In the above method and device, heat pump compressor technology is used to realize thermal energy recycling. Background technique [0002] Dimethyl Carbonate (Dimethyl Carbonate, DMC for short, chemical formula: ), which contains CH in its molecule 3 —, CH 3 O—, CH 3 O―CO―, ―CO― and other functional groups have a variety of reactivity, and are often used as raw materials for the synthesis of many chemical products such as polycarbonate, isocyanate, carbamate, malonate, and propanediurethane. Moreover, DMC is non-toxic and harmless, which meets the requirements of the era of clean production and green chemical industry. It gradually replaces highly toxic methylation reagents and carbonylation reagents (such as phosgene), and is widely used in high-performance resins, s...

Claims

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Application Information

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IPC IPC(8): C07C68/08C07C69/96C07C31/04C07C29/80C07C271/12C07C269/08
CPCC07C29/80C07C68/08C07C269/08C07C69/96C07C31/04C07C271/12
Inventor 王迅文唐文忠刘丹韩晖
Owner YASHENTECH CORP
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