Method for producing the 2-acrylamido-2-methylpropane sulfonic acid monomer and polymer comprising said monomer

Patent metadata

Field	Value
Publication number	US-10662149-B2
Application number	US-201615753577-A
Country	US
Kind code	B2
Filing date	Sep 16, 2016
Priority date	Sep 18, 2015
Publication date	May 26, 2020
Grant date	May 26, 2020

Abstract

The invention relates to a method for producing 2-acrylamido-2-methylpropane sulfonic acid. Said method consists in reacting together acrylonitrile, fuming sulfuric acid and isobutylene. It is characterized in that the isobutylene contains less than 1000 ppm of butadiene and less than 1000 ppm of butene.

First claim

The invention claimed is:

1. A production process for 2-acrylamido-2-methylpropane sulfonic acid, the process comprising co-reacting acrylonitrile, fuming sulfuric acid and isobutylene, wherein the isobutylene contains less than 1000 ppm of butadiene and less than 1000 ppm of butene, and wherein the 2-acrylamido-2-methylpropane sulfonic acid presents purity greater than 99.5%.

2. The process according to claim 1 , wherein the isobutylene contains less than 10 ppm of butadiene.

3. The process according to claim 1 , wherein the isobutylene contains less than 10 ppm of butene.

4. The process according to claim 1 , comprising, after forming the 2-acrylamido-2-methylpropane sulfonic acid, further processing to form a salt of 2-acrylamido-2-methylpropane sulfonic acid.

5. The process according to claim 1 , wherein the isobutylene contains less than 10 ppm of butadiene and less than 10 ppm of butene.

6. A process for preparing a polymer, said process comprising the following steps:
preparing of 2-acrylamido-2-methylpropane sulfonic acid according to claim 1 ; and
polymerizing of 2 acrylamido-2-methylpropane sulfonic acid and/or a neutralized form thereof, alone or in combination with other monomers.

7. The process according to claim 6 , wherein the 2-acrylamido-2-methylpropane sulfonic acid, and/or its neutralized form, is polymerized in combination with at least one nonionic monomer.

8. The process according to claim 6 , wherein the 2-acrylamido-2-methylpropane sulfonic acid, and/or its neutralized form, is polymerized in combination with at least one cationic monomer.

9. The process according to claim 6 , wherein the 2-acrylamido-2-methylpropane sulfonic acid, and/or its neutralized form, is polymerized in combination with at least one anionic monomer.

10. The process according to claim 7 , wherein the 2-acrylamido-2-methylpropane sulfonic acid, and/or its neutralized form, is polymerized in combination with at least one cationic monomer.

11. A process according to claim 10 , wherein the isobutylene contains less than 10 ppm of butadiene and less than 10 ppm of butene.

12. The process according to claim 7 , wherein the 2-acrylamido-2-methylpropane sulfonic acid, and/or its neutralized form, is polymerized in combination with at least one anionic monomer.

13. The process according to claim 12 , wherein the isobutylene contains less than 10 ppm of butadiene and less than 10 ppm of butene.

14. The process according to claim 2 , comprising, after forming the 2-acrylamido-2-methylpropane sulfonic acid, further processing to form a salt of 2-acrylamido-2-methylpropane sulfonic acid.

15. The process according to claim 3 , comprising, after forming the 2-acrylamido-2-methylpropane sulfonic acid, further processing to form a salt of 2-acrylamido-2-methylpropane sulfonic acid.

16. A process for preparing a polymer, said process comprising the following steps:
preparing 2-acrylamido-2-methylpropane sulfonic acid according to claim 2 ; and
polymerizing 2-acrylamido-2-methylpropane sulfonic acid and/or a neutralized form thereof, alone or in combination with other monomers.

17. A process for preparing a polymer, said process comprising the following steps:
preparing 2-acrylamido-2-methylpropane sulfonic acid according to claim 3 ; and
polymerizing 2-acrylamido-2-methylpropane sulfonic acid and/or a neutralized form thereof, alone or in combination with other monomers.

Assignees

• Spcm Sa

Inventors

• Favero Cédrick
• Kieffer Johann

Classifications

• C07C303/20 Primary

  by addition of sulfurous acid or salts thereof to compounds having carbon-to-carbon multiple bonds · CPC title

• C08F20/58

  containing oxygen in addition to the carbonamido oxygen {, e.g. N-methylolacrylamide, N-acryloylmorpholine} · CPC title

• C07C303/02 Primary

  of sulfonic acids or halides thereof · CPC title

• C07C303/22

  from sulfonic acids, by reactions not involving the formation of sulfo or halosulfonyl groups; {from sulfonic halides by reactions not involving the formation of halosulfonyl groups} · CPC title

• C07C309/15

  the nitrogen atom of at least one of the amino groups being part of any of the groups [IMAGE cpc-sch-C07C-0975.gif], X being a hetero atom, Y being any atom · CPC title