Method and apparatus for purification of dimethyl carbonate using pervaporation

Patent metadata

Field	Value
Publication number	US-10377696-B2
Application number	US-201515539008-A
Country	US
Kind code	B2
Filing date	Dec 24, 2015
Priority date	Dec 24, 2014
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

An apparatus for separating dimethyl carbonate using pervaporation includes: an atmospheric distillation column and a high pressure distillation column distilling a mixture containing dimethyl carbonate and methanol and separating dimethyl carbonate from the mixture; and a pervaporation membrane module disposed between the atmospheric distillation column and the high pressure distillation column and allowing for permeation of the methanol to separate the methanol from the mixture, thereby reducing heat consumption and a process cost as compared to the case of only using an existing pressure swing distillation method.

First claim

The invention claimed is:

1. An apparatus for purifying dimethyl carbonate using pervaporation, comprising:
an atmospheric distillation column and a high pressure distillation column distilling a mixture containing dimethyl carbonate and methanol and separating dimethyl carbonate from the mixture; and
a pervaporation membrane module disposed between the atmospheric distillation column and the high pressure distillation column and allowing for permeation of the methanol to separate the methanol from the mixture;
wherein the pervaporation membrane module supplies a recovered amount of the mixture to the high pressure distillation column, and wherein on a permeate side, the pervaporation membrane module is operated at a vacuum between 10 to 1,013 mbar,
wherein the atmospheric distillation column supplies an amount of the mixture recovered from an upper portion of the atmospheric distillation column to the pervaporation membrane module,
wherein the pervaporation membrane module supplies a permeation material to the atmospheric distillation column,
wherein the high pressure distillation column supplies an amount of the mixture recovered from an upper portion of the high pressure distillation column to the atmospheric distillation column.

2. The apparatus of claim 1 , wherein the pervaportion membrane module comprises a methanol selective membrane selected from a silica membrane, a organic-inorganic hybrid silica membrane, a zeolitic membrane, and a polymeric membrane which comprises a polyvinyl alcohol, polyimide, chitosan, or mixtures thereof.

3. The apparatus of claim 1 , wherein the pervaporation membrane module is maintained at a temperature within a range of 65 to 200° C.

4. The apparatus of claim 1 , wherein the feed and retentate side of the pervaporation membrane module is maintained at a level equal to 1 to 20 bars.

5. The apparatus of claim 1 , wherein the atmospheric distillation column is maintained at a level equal to 0.5 to 5 bars.

6. The apparatus of claim 1 , wherein the high pressure distillation column is maintained at a level equal to 5 to 20 bars.

Assignees

• Posco
• Energy Res Centre Of The Netherlands
• Res Inst Ind Science & Tech
• TNO

Inventors

• Baik Joon-Hyun
• Vente Jaap Ferdinand
• Motelica Anatolie

Classifications

• C07C68/08 Primary

  Purification; Separation; Stabilisation · CPC title

• B01D3/145 Primary

  One step being separation by permeation · CPC title

• B01D3/36

  Azeotropic distillation · CPC title

• B01D1/00

  Evaporating ({evaporation in general, e.g. of liquids for gas phase reactions B01B1/005} ; removal of incrustation B08B; preparation of starch C08B30/00; sugar industry C13; prevention of incrustation C23F; drying solid materials or objects by evaporating liquids therefrom F26) · CPC title

• C07C69/96

  Esters of carbonic or haloformic acids · CPC title