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 ?m or less to yield a neutralized product; and a hydrolyzing step of hydrolyzing the resultant neutralized product.

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 ?m or less to yield a neutralized product; and a hydrolyzing step of hydrolyzing the resultant neutralized product.

Abstract: In a method for cooling liquid, when a liquid containing a volatile component and a surfactant is supplied to an atmosphere having a pressure which is lower than or equal to the saturated vapor pressure of the volatile component so that at least a portion of the volatile component is vaporized, whereby the liquid is cooled, a gas other than the volatile component is introduced into the atmosphere having the pressure so that the gas contacts the liquid.

Abstract: A method for producing polyoxyalkylene alkyl ether carboxylic acid or a salt thereof includes an oxidation reaction process of oxidizing polyoxyalkylene alkyl ether with oxygen by supplying an oxygen-containing gas to a suspension or a solution that has a depth of 200 mm or more and includes polyoxyalkylene alkyl ether. In the oxidation reaction process, a supply rate of the oxygen-containing gas is reduced in a period in which the conversion is greater than or equal to 50% and less than 70%.

Abstract: In a method for cooling liquid, when a liquid containing a volatile component and a surfactant is supplied to an atmosphere having a pressure which is lower than or equal to the saturated vapor pressure of the volatile component so that at least a portion of the volatile component is vaporized, whereby the liquid is cooled, a gas other than the volatile component is introduced into the atmosphere having the pressure so that the gas contacts the liquid.

Abstract: In a method for cooling liquid, when a liquid containing a volatile component and a surfactant is supplied to an atmosphere having a pressure which is lower than or equal to the saturated vapor pressure of the volatile component so that at least a portion of the volatile component is vaporized, whereby the liquid is cooled, a gas other than the volatile component is introduced into the atmosphere having the pressure so that the gas contacts the liquid.

Abstract: A method for producing polyoxyalkylene alkyl ether carboxylic acid or a salt thereof includes an oxidation reaction process of oxidizing polyoxyalkylene alkyl ether with oxygen by supplying an oxygen-containing gas to a suspension or a solution that has a depth of 200 mm or more and includes polyoxyalkylene alkyl ether. In the oxidation reaction process, a supply rate of the oxygen-containing gas is reduced in a period in which the conversion is greater than or equal to 50% and less than 70%.

Abstract: In a method for cooling liquid, when a liquid containing a volatile component and a surfactant is supplied to an atmosphere having a pressure which is lower than or equal to the saturated vapor pressure of the volatile component so that at least a portion of the volatile component is vaporized, whereby the liquid is cooled, a gas other than the volatile component is introduced into the atmosphere having the pressure so that the gas contacts the liquid.

Abstract: Disclosed is the method for producing an anionic surfactant powder, including removing impurities by introducing gas into a crude anionic surfactant containing water in a content of 0.01 to 5% by weight in a granulator or drier, having an agitating blade. Also disclosed is the method for producing an anionic surfactant powder, including introducing a gas along with the surface of an inner wall of a granulator or drier having an agitating blade at a reduced pressure to produce the anionic surfactant powder.

Abstract: Disclosed is a method for producing an anionic surfactant powder, which comprises a step wherein an aqueous anionic surfactant solution having an anionic surfactant concentration of 0.01-40% by weight is introduced into a granulating machine or a drying machine having a mixing blade under a reduced pressure for granulation and drying.

Abstract: The present invention relates to a method for producing an anionic surfactant granule, which includes granulating an anionic surfactant powder in a granulator having an agitating blade, while adding water, at a temperature of the granule being higher by 0.5 to 30° C. than a boiling point of water under a pressure of the inside of the granulator.

Abstract: Disclosed is the method for producing an anionic surfactant powder, including removing impurities by introducing gas into a crude anionic surfactant containing water in a content of 0.01 to 5% by weight in a granulator or drier, having an agitating blade. Also disclosed is the method for producing an anionic surfactant powder, including introducing a gas along with the surface of an inner wall of a granulator or drier having an agitating blade at a reduced pressure to produce the anionic surfactant powder.

Abstract: The present invention relates to a method for producing an anionic surfactant granule, which includes granulating an anionic surfactant powder in a granulator having an agitating blade, while adding water, at a temperature of the granule being higher by 0.5 to 30° C. than a boiling point of water under a pressure of the inside of the granulator.

Abstract: Disclosed is a method for producing an anionic surfactant powder, which comprises a step wherein an aqueous anionic surfactant solution having an anionic surfactant concentration of 0.01-40% by weight is introduced into a granulating machine or a drying machine having a mixing blade under a reduced pressure for granulation and drying.