Distillation apparatus

Patent metadata

Field	Value
Publication number	US-9919238-B2
Application number	US-201414905618-A
Country	US
Kind code	B2
Filing date	Jul 18, 2014
Priority date	Jul 18, 2013
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

The present application relates to a distillation apparatus and a separation method, and according to the distillation apparatus and the separation method of the present application, it is possible to separate a material to be separated during the separation of a mixture of three or more components, for example, 2-ethylhexyl acrylate with high purity, and to achieve an object of saving energy during the separation and purification process of 2-ethylhexyl acrylate.

First claim

The invention claimed is:

1. A distillation apparatus comprising:
a first distillation apparatus comprising a first distillation column, a first condenser and a reboiler each connected to the first distillation column; and
a second distillation apparatus comprising a second distillation column and a second condenser connected to the second distillation column,
wherein the first distillation column comprises a raw material inflow part, a first upper plate inflow part, a first upper plate outflow part, a middle plate inflow part, a middle plate outflow part, a first lower plate inflow part, and a first lower plate outflow part, and the second distillation column comprises a second lower plate inflow part, a second lower plate outflow part, a second upper plate inflow part, and a second upper plate outflow part,
a raw material is introduced into the raw material inflow part of the first distillation column, and the introduced raw material is discharged while being separated into a first distillation column upper plate outflow stream discharged from the first upper plate outflow part of the first distillation column, a middle plate outflow stream discharged from the middle plate outflow part, and a first distillation column lower plate outflow stream discharged from the first lower plate outflow part,
the first distillation column upper plate outflow stream discharged from the first upper plate outflow part passes through the first condenser, and a part or all of the first distillation column upper plate outflow stream which has passed through the first condenser is introduced into the first upper plate inflow part to flow back to the first distillation column,
the first distillation column lower plate outflow stream discharged from the first lower plate outflow part passes through a reboiler, and a part or all of the first distillation column lower plate outflow stream which has passed through the reboiler is introduced into the first lower plate inflow part to flow back to the first distillation column,
the middle plate outflow stream discharged from the middle plate outflow part is introduced into the second lower plate inflow part of the second distillation column, and a part or all of a second distillation column lower plate outflow stream discharged from the second lower plate outflow part is introduced into the middle plate inflow part of the first distillation column, and
a second distillation column upper plate outflow stream discharged from the second upper plate outflow part of the second distillation column part passes through the second condenser, and a part or all of the second distillation column upper plate outflow stream which has passed through the second condenser is introduced into the second upper plate inflow part to flow back to the second distillation column;
wherein the middle plate outflow part is formed of two or more openings positioned to be separated from each other at equal intervals in a horizontal cross section of the first distillation column, and
wherein each of the two or more openings of the middle plate outflow part is arranged to face two or more directions.

2. The distillation apparatus of claim 1 , wherein the raw material comprises a compound of the following Formula 1:

in Formula 1,
R 1 represents hydrogen, or an alkyl group having 1 to 10 carbon atoms, and
R 2 represents a linear or branched alkyl group having 1 to 24 carbon atoms.

3. The distillation apparatus of claim 1 , wherein the middle plate outflow part is disposed at a part lower than the raw material inflow part.

4. The distillation apparatus of claim 1 , wherein the middle plate inflow part is disposed at a part lower than the middle plate outflow part.

5. The distillation apparatus of claim 4 , wherein the middle plate inflow part and the middle plate outflow part are disposed at the same plate.

6. The distillation apparatus of claim 1 , wherein the second lower plate inflow part and the second lower plate outflow part are disposed at a column bottom of the second distillation column.

7. The distillation apparatus of claim 1 , further comprising a heater which preheats the raw material before being introduced.

8. The distillation apparatus of claim 1 , further comprising a first heat exchanger which is disposed at a front plate of the first condenser and heat-exchanges the first distillation column upper plate outflow stream and the raw material.

9. The distillation apparatus of claim 1 , further comprising a second heat exchanger which is disposed at a front plate of the second condenser and heat-exchanges the second distillation column upper plate outflow stream and the raw material.

10. The distillation apparatus of claim 1 , wherein one or more of the raw material inflow part, the first upper plate inflow part, the middle plate inflow part, the first lower plate inflow part, the second lower plate inflow part, and the second upper plate inflow part is formed of two or more openings disposed to be separated from each other.

11. The distillation apparatus of claim 10 , wherein one or more of the second lower plate inflow part, and the second upper plate inflow part is formed of two or more openings disposed to be separated from each other, and the two or more openings are each disposed in two or more small areas which equally divide a horizontal cross section of the second distillation column.

12. The distillation apparatus of claim 1 , wherein the first distillation column is a dividing wall distillation column comprising a dividing wall therein.

13. The distillation apparatus of claim 12 , wherein the first distillation column comprises an upper part area, a lower part area, and a middle part area in which a dividing wall is disposed, between the upper part area and the lower part area, and the middle part area comprises a first middle part area and a second middle part area each divided by the dividing wall, and
the raw material inflow part is disposed in the first middle part area, the first upper plate inflow part and the first upper plate outflow part are disposed in the upper part area, the middle plate inflow part and the middle plate outflow part are disposed in the second middle part area, and the first lower plate inflow part and the first lower plate outflow part are disposed in the lower part area.

14. The distillation apparatus of claim 12 , further comprising a third upper plate inflow part, a third upper plate outflow part, and a third condenser,
wherein the dividing wall is in contact with a column top of the first distillation column and separated from a column bottom,
the first distillation column is divided into a first area and a third area each divided by the dividing wall, and a second area disposed at a side lower than the first area and the third area and in which the dividing wall is not disposed,
the raw material inflow part, the first upper plate inflow part, and the first upper plate outflow part are disposed in the first area, the first lower plate inflow part and the first lower plate outflow part are disposed in the second area, and the third upper plate inflow part, the third upper plate outflow part, the middle plate inflow part, and the middle plate outflow part are disposed in the third area,
the raw material is introduced into the raw material inflow part of the first area, and the introduced raw material is discharged into a first area upper plate outflow stream discharged from the first upper plate outflow part of the first area; a first distillation column lowe

Assignees

• Lg Chemical Ltd

Inventors

• Lee Sung Kyu
• Shin Joon Ho
• Kim Sung Kyun
• Lee Jong Ku

Classifications

• B01D3/008

  Liquid distribution · CPC title

• B01D3/143

  by two or more of a fractionation, separation or rectification step · CPC title

• C07C41/42

  by distillation · CPC title

• B01D3/141 Primary

  where at least one distillation column contains at least one dividing wall · CPC title

• C07C69/54

  Acrylic acid esters; Methacrylic acid esters · CPC title