Method of purifying acetone

Patent metadata

Field	Value
Publication number	US-10745337-B2
Application number	US-201816652544-A
Country	US
Kind code	B2
Filing date	Oct 3, 2018
Priority date	Oct 6, 2017
Publication date	Aug 18, 2020
Grant date	Aug 18, 2020

Abstract

In an embodiment a method of purifying acetone, comprises directing a feed stream comprising greater than or equal to 97 wt % of acetone and 100 to 1,000 ppm of methanol to a separation column, both based on a total weight of the feed stream; separating the feed stream in the separation column that is operating at a pressure greater than or equal to 1 bar into an overhead stream and a purified acetone stream comprising less than or equal to 50 ppm of methanol based on a total weight of the purified acetone stream; and directing at least 80 wt % of the overhead stream into the separation column as a reconstituted stream and purging 1 to 20 wt % of the overhead stream as a purge stream.

First claim

What is claimed is:

1. A method of purifying acetone, comprising: directing a feed stream comprising greater than or equal to 97 wt % of acetone and 100 to 1,000 ppm of methanol to a separation column, both based on a total weight of the feed stream; separating the feed stream in the separation column, that is operating at a pressure greater than or equal to 1 bar, into an overhead stream and a purified acetone stream comprising less than or equal to 50 ppm of methanol based on a total weight of the purified acetone stream; removing the purified acetone stream; and directing at least 80 wt % of the overhead stream into the separation column as a reconstituted stream and purging 1 to 20 wt % of the overhead stream as a purge stream.

2. The method of claim 1 , further comprising directing the purge stream and a phenol water feed stream to a phenol water separation unit and separating a waste water stream, a phenol stream, and a recovered acetone stream.

3. The method of claim 1 , wherein the feed stream comprises 97 to 99.5 wt % of acetone based on the total weight of the feed stream.

4. The method of claim 1 , wherein the feed stream comprises 100 to 500 ppm of methanol based on the total weight of the feed stream.

5. The method of claim 1 , wherein the pressure is 3 to 20 bars.

6. The method of claim 1 , wherein the pressure is 5 to 15 bars.

7. The method of claim 1 , wherein the purified acetone stream comprises 1 to 40 ppm of methanol based on the total weight of the purified acetone stream.

8. The method of claim 1 , wherein the directing the overhead stream comprises directing 90 to 97 wt % of the overhead stream into the separation column.

9. The method of claim 1 , wherein the purging comprises purging 3 to 10 wt % of the overhead stream as purge stream.

10. The method of claim 1 , wherein the column operates at a reflux ratio of less than or equal to 35.

11. The method of claim 1 , further comprising combining the feed stream and the reconstituted stream upstream of the separation column to form a combined stream and directing the combined stream to the separation column.

12. The method of claim 1 , further comprising adding the purified acetone stream and a monomer feed stream comprising phenol to a bisphenol production facility and forming a bisphenol stream in the bisphenol production facility.

13. The method of claim 12 , further comprising directly adding the purified acetone stream such that it is not further purified prior to the adding.

14. The method of claim 13 , further comprising directing at least a portion of the recovered acetone stream to the separation column.

15. The method of claim 13 , further comprising directing at least a portion of the recovered acetone stream to a bisphenol production facility.

16. The method of claim 13 , wherein greater than or equal to 99 wt % of the acetone in the purge stream is recovered in the recovered acetone stream.

17. The method of claim 13 , wherein the recovered acetone stream is recycled back to one or both of a bisphenol A production facility and an acetone purification unit.

18. The method of claim 1 , wherein the feed stream comprises less than or equal to 5 wt % of water based on the total weight of the feed stream.

19. The method of claim 1 , wherein the purified acetone stream comprises 5 to 25 ppm of methanol based on the total weight of the purified acetone stream.

Assignees

• Sabic Global Technologies Bv

Inventors

• Daliparthi Surya Prakasa Rao
• Gonzalez Vidal Nathalie
• Eijsbouts Paulus Johannes Maria

Classifications

• C07C45/78 Primary

  Separation; Purification; Stabilisation; Use of additives · CPC title

• C07C45/82 Primary

  by distillation · CPC title

• C07C49/08

  Acetone · CPC title