Internal olefin sulfonate composition and method for preserving internal olefin sulfonate

An internal olefin sulfonate composition comprising an internal olefin sulfonate, one or more kinds of alkaline agents selected from among an alkali metal hydroxide and an alkaline earth metal hydroxide, and water, wherein

• a content of the alkaline agent is 0.2 mmol or more and 15 mmol or less per 1 mol of the internal olefin sulfonate.

A method for preserving an internal olefin sulfonate in a composition comprising the internal olefin sulfonate and water, the method comprising:

• when a content of the internal olefin sulfonate in the composition is 10% by mass or less, adjusting pH at 25° C. of the composition to 8.5 or more and 11.0 or less, or
• when a content of the internal olefin sulfonate in the composition is more than 10% by mass, adjusting pH at 25° C. of a diluted solution to 8.5 or more and 11.0 or less, obtained by diluting the composition with water so that the content of the internal olefin sulfonate becomes 10% by mass.

A method for preserving an internal olefin sulfonate, comprising mixing an internal olefin sulfonate with at least one or more alkaline agents selected from among an alkali metal hydroxide and an alkaline earth metal hydroxide to form a composition,

• wherein a content of the alkaline agent in the composition is 0.2 mmol or more and 15 mmol or less per 1 mol of the internal olefin sulfonate.