Distillation method

Patent metadata

Field	Value
Publication number	US-10464867-B2
Application number	US-201515510134-A
Country	US
Kind code	B2
Filing date	Nov 2, 2015
Priority date	Oct 31, 2014
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

The present application relates to a distillation device. The distillation device of the present application can minimize energy loss occurring in a purification process of the olefin monomer, the solvent, and the raw material including, for example, 1-octene, iso-octene, and n-hexane, used in a polymerization process of the polyolefin elastomer, and can increase economic efficiency by isolating a high-purity product.

First claim

The invention claimed is:

1. A distillation method, comprising:
introducing a raw material comprising compounds represented by Formulas 1 and 2 below into a first supply port of a first distillation column,
obtaining a first top stream at an upper section of the first distillation column, and separately obtaining first, second and third bottom streams at a bottom section of the first distillation column,
introducing the first bottom stream into a second supply port of a second distillation column,
obtaining a second top stream at an upper section of a second distillation column and obtaining fourth and fifth bottom streams at a bottom section of the second distillation column,

heat-exchanging the second top stream with the third bottom stream; and
isolating the compound represented by Formula 2 from the first top stream, and the compound represented by Formula 1 from the second top stream,
wherein Equations 1 and 2 below are satisfied:

wherein R 1 is a C 4 to C 12 alkyl group, and R 2 to R 4 are each independently hydrogen or a C 4 to C 12 alkyl group,
R 5 is a C 1 to C 4 alkyl group, and n is 1 to 4;
T t-2 −T b-3 ≥8° C.,  [Equation 1]

P 2 /P 1 ≥3.0,  [Equation 2]

wherein T t-2 indicates a temperature of the second top stream, and T b-3 indicates a temperature of the third bottom stream, and

P 1 indicates a pressure of the upper section of the first distillation column in kg/cm 2 g, and P 2 indicates a pressure of the upper section of the second distillation column in kg/cm 2 g.

2. The method according to claim 1 , wherein the compound represented by Formula 1 is at least one selected from the group consisting of 1-octene, iso-octene and a mixture thereof, and the compound represented by Formula 2 is n-hexane.

3. The method according to claim 2 , wherein a content of n-hexane in the first top stream is 90% or more, and a content of 1-octene, iso-octene, or a mixture thereof in the second top stream is 90% or more.

4. The method according to claim 1 , wherein the second top stream that is heat-exchanged with the third bottom stream is introduced into a second condenser, which is in fluid communication with the second distillation column, and a portion of the second top stream passing through the second condenser is introduced into the upper section of the second distillation column, and a remainder of the second top stream passing through the second condenser is introduced into a storage tank to store the compound represented by Formula 1 therein.

5. The method according to claim 1 , wherein a pressure of the upper section of the first distillation column is 0.05 to 0.2 kg/cm 2 g.

6. The method according to claim 1 , wherein a pressure of the upper section of the second distillation column is 1.0 to 2.0 kg/cm 2 g.

7. The method according to claim 1 , wherein a temperature of the upper section of the first distillation column is 60 to 80° C.

8. The method according to claim 1 , wherein a temperature of the lower section of the first distillation column is 120 to 145° C.

9. The method according to claim 1 , wherein a temperature of the upper section of the second distillation column is 125 to 170° C.

10. The method according to claim 1 , wherein a temperature of the lower section of the second distillation column is 130 to 180° C.

11. The method according to claim 1 , wherein the compound represented by Formula 2 is a solvent used in polymerization of a polyolefin elastomer.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Sung Kyu
• Shin Ho Joon

Classifications

• C07C11/02

  Alkenes · CPC title

• B01D3/143

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

• C07C9/15

  Straight-chain hydrocarbons · CPC title

• C07C7/04 Primary

  by distillation · CPC title

• B01D3/4211

  of columns · CPC title