Method for purifying isopropyl alcohol

Patent metadata

Field	Value
Publication number	US-2016200650-A1
Application number	US-201414912731-A
Country	US
Kind code	A1
Filing date	Aug 20, 2014
Priority date	Aug 20, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

Provided are a method of and a device for purifying isopropyl alcohol. Water may be effectively removed from a feed including water and isopropyl alcohol by consumption of the minimum amount of energy, and therefore, a high purity isopropyl alcohol may be obtained.

First claim

1 . A method for purifying isopropyl alcohol, comprising:
removing water by providing a feed including isopropyl alcohol and water to a dehydration means including a membrane system and a column charged with an adsorbent; and performing purification by providing the feed having a water content adjusted by removing water in the dehydration means to a divided wall column.

2 . The method according to claim 1 , wherein the membrane system is a pervaporation system or a vapor permeation system.

3 . The method according to claim 1 , wherein the adsorbent includes a molecular sieve, a silica gel, an activated alumina, an activated carbon, or an ion exchange resin.

4 . The method according to claim 1 , wherein the removing of water includes providing a feed having a water content of 1,200 to 5,000 ppm to the dehydration means, and adjusting a water content of the feed in the dehydration means to 500 ppm or less.

5 . The method according to claim 1 , wherein the removal of water includes adjusting a water content to 500 to 1,200 ppm by providing a feed having a water content of 1,200 to 5,000 ppm to the membrane system, and adjusting a water content to 50 to 500 ppm by providing the feed in which the water content is adjusted to 500 to 1,200 ppm to the column charged with the adsorbent.

6 . The method according to claim 1 , wherein the performing of purification includes providing the feed having a water content adjusted to 500 ppm or less by removing water from the dehydration means to the divided wall column and adjusting the water content to 150 ppm or less.

7 . The method according to claim 1 , wherein the divided wall column is divided into a feed inflow region, a top region, a bottom region, and a product outflow region, and the product outflow region is divided into an upper product outflow region and a lower product outflow region, and
the performing of purification includes providing the feed having a water content adjusted to 500 ppm or less by removing water from the dehydration means to the feed inflow region of the divided wall column, and performing purification in the divided wall column to obtain a discharged product including purified isopropyl alcohol and having a water content of 150 ppm or less from the lower product outflow region of the divided wall column.

8 . The method according to claim 7 , wherein the discharged product including purified isopropyl alcohol and having a water content of 150 ppm or less is obtained from 50 to 90% plates of the number of theoretical plates calculated based on a top of the divided wall column.

9 . The method according to claim 7 , wherein a temperature of the top region of the divided wall column is adjusted to 40 to 120° C.

10 . The method according to claim 7 , wherein a pressure of the top region of the divided wall column is adjusted to 0.1 to 10.0 Kg/cm 2 .

11 . The method according to claim 9 , wherein a temperature of a flow discharged from the lower product region of the divided wall column is 60 to 130° C.

12 . The method according to claim 10 , wherein a pressure of the lower product outflow region of the divided wall column is 0.3 to 6.0 Kg/cm 2 .

13 . The method according to claim 9 , wherein a temperature of the bottom region of the divided wall column is 80 to 160° C.

14 . The method according to claim 10 , wherein a pressure of the bottom region of the divided wall column is 0.3 to 6.0 Kg/cm 2 .

15 . A device for purifying isopropyl alcohol, comprising:
a dehydration means including a membrane system and a column charged with an adsorbent into which a feed including isopropyl alcohol and water is introduced, and discharging the feed by adjusting a water content of the feed; and a divided wall column in which a purification process is performed after the feed passing through the dehydration means is introduced.

16 . The device according to claim 15 , wherein the membrane system is a pervaporation system or a vapor permeation system.

17 . The device according to claim 15 , wherein the adsorbent includes a molecular sieve, a silica gel, an activated alumina, an activated carbon, or an ion exchange resin.

18 . The device according to claim 17 , wherein the molecular sieve includes zeolite, silica-alumina, or silicate alumina.

19 . The device according to claim 15 , wherein the divided wall column is divided into a feed inflow region, a top region, a bottom region, and a product outflow region, and the product outflow region is divided into an upper product outflow region and a lower product outflow region, and
the feed having a water content adjusted to 500 ppm or less by removing water from the dehydration means is provided to the feed inflow region of the divided wall column, and a discharged product including purified isopropyl alcohol and having a water content of 150 ppm or less is discharged from the lower product outflow region of the divided wall column.

Assignees

• Lg Chemical Ltd

Inventors

• Park Jong Suh
• Lee Sung Kyu
• Shin Joon Ho
• Lee Jong Ku

Classifications

• C07C29/80

  by distillation · CPC title

• B01D2311/2626

  Absorption or adsorption · CPC title

• B01D61/366

  Apparatus therefor · CPC title

• C07C29/76 Primary

  by physical treatment · CPC title

• B01D2311/08

  Specific process operations in the concentrate stream · CPC title