Process for preparing an internal olefin sulfonate

Patent metadata

Field	Value
Publication number	US-9688621-B2
Application number	US-201214366757-A
Country	US
Kind code	B2
Filing date	Dec 21, 2012
Priority date	Dec 23, 2011
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

The invention relates to a process for preparing an internal olefin sulfonate, comprising sulfonating an internal olefin into sulfonated internal olefin followed by contacting sulfonated internal olefin with a base containing solution, wherein the molar ratio of internal olefin to solvent for the base is higher than 0.06. Further, the invention relates to an internal olefin sulfonate obtainable by said process.

First claim

That which is claimed is:

1. A process for preparing an internal olefin sulfonate, comprising sulfonating an internal olefin into sulfonated internal olefin followed by contacting sulfonated internal olefin with a base containing solution, wherein the molar ratio of internal olefin to solvent for the base is higher than 0.06, which process is performed in the absence of a viscosity modifier.

2. The process according to claim 1 , wherein the molar ratio of internal olefin to solvent for the base is higher than 0.06 to 2.

3. The process according to claim 1 , wherein the active matter content for the internal olefin sulfonate product of the process is 40 to 90 wt.

4. The process according to claim 1 , wherein the average carbon number of the internal olefin is from 5 to 40.

5. The process according to claim 1 , which is carried out continuously.

6. The process according to claim 1 , wherein the base is a water soluble base and the solvent for the base is water.

7. The process according to claim 6 , wherein the water soluble base is selected from the group consisting of hydroxides, carbonates and bicarbonates of an alkali metal ion, such as sodium or potassium, or of an earth alkali metal ion, or of ammonium ion, and amine compounds.

8. The process according to claim 7 , wherein the water soluble base is sodium hydroxide.

9. The process according to claim 1 , wherein the temperature at which sulfonated internal olefin is contacted with the base containing solution is 0 to 250° C.

10. The process according to claim 1 , wherein in the step wherein sulfonated internal olefin is contacted with the base containing solution, a non-ionic surfactant is added.

11. The process according to claim 10 , wherein the non-ionic surfactant is an alkoxylate of an alcohol having an aliphatic group.

12. The process according to claim 1 , wherein the viscosity modifier is 2-butoxy-ethanol.

Assignees

• Shell Int Research
• Shell Oil Co

Inventors

• Barnes Julian Richard
• Dirkzwager Hendrik
• Moene Robert
• Smit Jasper Roelf

Classifications

• C07C303/06 Primary

  by reaction with sulfuric acid or sulfur trioxide · CPC title

• C07C303/22 Primary

  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

• C07C309/20

  of an acyclic unsaturated carbon skeleton · CPC title