Distillation device

Patent metadata

Field	Value
Publication number	US-10486080-B2
Application number	US-201615580393-A
Country	US
Kind code	B2
Filing date	Jul 1, 2016
Priority date	Jul 2, 2015
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

The present application relates to a distillation device. When a feedstock containing acetone and methanol is separated using a distillation device according to the present application, a methanol removal distillation column may be located at a position for easily separating methanol to solve a problem due to accumulation of methanol in the process and to lower the methanol content in the acetone product, and thus the lifetime of catalysts can be extended, and moreover, methanol can be removed with good efficiency from a flow of the lower part of the distillation column obtaining the final acetone product by using only the conventional phase separator and one methanol removal distillation column further installed, so that the acetone product obtained from the upper part of the distillation column obtaining the acetone product can be obtained in high purity and the operating cost and the equipment cost of equipments can be greatly reduced.

First claim

The invention claimed is:

1. A distillation device which comprises a first distillation unit comprising a first condenser, a first reboiler and a first distillation column; a phase separator; and a second distillation unit comprising a second condenser, a second reboiler and a second distillation column located between said first distillation column and said phase separator and fluidically connected to said first distillation column and said phase separator,
wherein a feedstock comprising a first compound, a second compound being capable of forming an azeotrope with said first compound and water, flows into said first distillation column, and the feedstock introduced into said first distillation column is divided into a first top flow discharged from a top region of said first distillation column and a first bottom flow discharged from a bottom region of said first distillation column, respectively, and discharged,
wherein said first top flow flows into said first condenser and some or all of the first top flow passing through said first condenser is refluxed to the top region of said first distillation column, and a portion of said first bottom flow flows into said first reboiler and a portion of said bottom flow passing through said first reboiler is refluxed to the bottom region of said first distillation column,
wherein a remaining portion of said first bottom flow flows into said second distillation column, and the remaining portion of said first bottom flow introduced into said second distillation column is divided into a second top flow discharged from a top region of said second distillation column and a second bottom flow discharged from a bottom region of said second distillation column, respectively, and discharged,
wherein said second top flow flows into said second condenser and some or all of the second top flow passing through said second condenser is refluxed to the top region of said second distillation column, and a portion of said second bottom flow flows into said second reboiler and a portion of said second bottom flow passing through said second reboiler is refluxed to the bottom region of said second distillation column,
wherein a remaining portion of said second bottom flow flows into said phase separator, and the remaining portion of said second bottom flow introduced into said phase separator is divided into an organic substance-containing component and a water-containing component in said phase separator, and discharged,
wherein said first top flow comprises the first compound and the second compound, and said first bottom flow comprises the first compound, the second compound, and a substance having a boiling point higher than that of said second compound,
wherein said second top flow comprises the first compound and the second compound, and said second bottom flow comprises a substance having a boiling point higher than that of said second compound,
wherein the content of said second compound in said first top flow is 0.002 to 0.1 parts by weight relative to 100 parts by weight of the total components contained in said first top flow, and
wherein the first compound is acetone,
wherein the second compound is methanol,
wherein the distillation device further comprises a cooling device located between the second distillation column and the phase separator,
wherein the remaining portion of the second bottom flow flows into said phase separator after being introduced into said cooling device and cooled,
wherein a temperature of the top region of the second distillation column is 40 to 70° C. and a pressure of the top region of the second distillation column is from −0.6 to 0kgf/cm 2 g, and
wherein a temperature of the bottom region of the second distillation column is 70 to 95° C. and a pressure of the bottom region of the second distillation column is −0.4 to 0kgf/cm 2 g.

2. The distillation device according to claim 1 , wherein the content of said second compound in the second top flow is 0.01 to 0.5 parts by weight relative to 100 parts by weight of the total components contained in said second top flow.

3. The distillation device according to claim 1 , wherein the temperature of the cooled second bottom flow introduced into the phase separator is 50 to 90° C.

4. The distillation device according to claim 1 , wherein the organic substance-containing component comprises one or more selected from the group consisting of aliphatic aldehyde, alpha-methylstyrene, water and cumene.

5. The distillation device according to claim 1 , wherein the water-containing component comprises the first compound, the second compound and water.

6. The distillation device according to claim 1 , further comprising a reactor; a neutralizer; and a third distillation unit comprising a third condenser, a third reboiler and a third distillation column,
wherein the water-containing component discharged from the phase separator and the feedstock containing the first compound and the second compound, discharged from said reactor, flow into the neutralizer, and the feedstock containing the first compound and the second compound discharged from the neutralizer flows into the third distillation column,
wherein the feedstock introduced into said third distillation column is divided into a third top flow discharged from a top region of said third distillation column and a third bottom flow discharged from a bottom region of said third distillation column, respectively, and discharged,
wherein said third top flow flows into said third condenser and a portion of the third top flow passing through said third condenser is refluxed to the top region of said third distillation column, and a portion of said third bottom flow flows into said third reboiler and a portion of said third bottom flow passing through said third reboiler is refluxed to the bottom region of said third distillation column, and
wherein a remaining portion of said third top flow flows into the first distillation column, and a portion of the first top flow flows into said reactor.

Assignees

• Lg Chemical Ltd

Inventors

• Choo Yeon Uk
• Lee Sung Kyu
• Kim Tae Woo
• Park Jong Suh
• Shin Joon Ho

Classifications

• C07C45/53

  of hydroperoxides · CPC title

• B01D3/36

  Azeotropic distillation · CPC title

• B01D3/141

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

• C07C45/84

  by azeotropic distillation · CPC title

• B01D3/143 Primary

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