Method for producing internal olefin sulfonate

Patent metadata

Field	Value
Publication number	US-9815779-B2
Application number	US-201415108087-A
Country	US
Kind code	B2
Filing date	Nov 27, 2014
Priority date	Dec 27, 2013
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

The present invention provides a method for producing a high-quality internal olefin sulfonate in which the content of any internal olefin and inorganic substance is small. This method for producing an internal olefin sulfonate, comprising: a sulfonating step of causing an internal olefin to react with sulfur trioxide to yield a sulfonated internal olefin; a neutralizing step of mixing the resultant sulfonated internal olefin with an aqueous alkaline solution at 40° C. or lower to yield a mixture, and applying shearing force to the mixture until the particle diameter of oil droplets of an oily product of the mixture turns to 10 μm or less to yield a neutralized product; and a hydrolyzing step of hydrolyzing the resultant neutralized product.

First claim

The invention claimed is:

1. A method for producing an internal olefin sulfonate, comprising:
causing an internal olefin to react with sulfur trioxide to yield a sulfonated internal olefin;
mixing the sulfonated internal olefin with an aqueous alkaline solution at 40° C. or lower to yield a mixture, and applying a shearing force to the mixture at an agitating speed of 5 m/s or more until a particle diameter of oil droplets of an oily product of the mixture turns to 10 μm or less to yield a neutralized product; and
hydrolyzing the neutralized product.

2. The method for producing an internal olefin sulfonate according to claim 1 , wherein concentration of the sulfonated internal olefin in the neutralized product is from 15 to 75% by mass.

3. The method for producing an internal olefin sulfonate according to claim 1 , wherein a means for applying the shearing force is an agitating machine.

4. The method for producing an internal olefin sulfonate according to claim 3 , wherein agitating speed of the agitating machine is from 5 to 30 m/s.

5. The method for producing an internal olefin sulfonate according to claim 1 , wherein a total time of the steps of mixing and applying shearing force is from 5 to 100 minutes.

6. The method for producing an internal olefin sulfonate according to claim 1 , wherein the internal olefin comprises 48% or less by mass of an internal olefin isomer which has, at a C2 position thereof, a double bond.

7. The method for producing an internal olefin sulfonate according to claim 1 , wherein the mixing of the sulfonated internal olefin with the aqueous alkaline solution is performed at from 0 to 35° C.

8. The method for producing an internal olefin sulfonate according to claim 1 , wherein the particle diameter of oil droplets of the oily product is 0.1 μm or more.

9. The method for producing an internal olefin sulfonate according to claim 1 , wherein concentration of the sulfonated internal olefin in the neutralized product is from 30 to 75% by mass.

10. The method for producing an internal olefin sulfonate according to claim 1 , wherein in the neutralizing step, concentration of the sulfonated internal olefin in the neutralized product is from 40 to 70% by mass.

11. The method for producing an internal olefin sulfonate according to claim 1 , wherein the internal olefin is caused to react with the sulfur trioxide to yield the sulfonated internal olefin reactor, and
temperature of a cooling water of the reactor is from 0 to 20° C.

12. The method for producing an internal olefin sulfonate according claim 1 , wherein the steps of mixing and applying shearing force are performed by a continuous method.

13. The method for producing an internal olefin sulfonate according to claim 12 , wherein the steps of mixing and applying shearing force are conducted in a loop-type reactor.

14. The method for producing an internal olefin sulfonate according to claim 12 , wherein a circulatory ratio of a reaction liquid circulating in a reactor to an amount of a flowing amount of the reaction liquid charged into the reactor is from 3 to 30 times.

15. The method for producing an internal olefin sulfonate according to claim 1 , wherein the agitating speed is from 5 to 30 m/s.

Assignees

• Kao Corp

Inventors

• Hori Hiroshi
• Yoshikawa Yohei
• Mitsuda Yoshinori
• Fujioka Toku
• Nishimoto Yoshifumi

Classifications

• C07C303/32 Primary

  of salts of sulfonic acids · CPC title

• C11D1/14

  derived from aliphatic hydrocarbons or mono-alcohols · CPC title

• C11D1/143

  Sulfonic acid esters · CPC title

• C07C309/20

  of an acyclic unsaturated carbon skeleton · CPC title