Method for the production of bleached, low-sultone olefin...

Details Method for the production of bleached, low-sultone olefin... Method for the production of bleached, low-sultone olefin...

C - Chemistry, Metallurgy

11

D

260/505

C11D 1/14 (2006.01)

Patent

CA 1065888

METHOD FOR THE PRODUCTION OF BLEACHED, LOW-SOLTONE OLEFIN SULFONATES Abstract of the Disclosure Aqueous solutions of alkali metal C8-22 .alpha.-olefin sulfonates of light color and of low sultone content are pre- pared rapidly and at moderate temperatures by: (a) reacting a C8-22 .alpha.-olefin with gaseous sulfur trioxide thereby forming a crude sulfonation product mixture containing C8-22 olefin sulfonic acids,with a content of sultones, (b) bleaching said crude sulfonation product mixture at 30°C to 80°C for 10 to 60 minutes with an aqueous alkaline bleaching solution at a pH of at least 8, (c) heating said diluted bleached sulfonation product mixture containing excess alkali to a temperature of from 140°C to 170°C until the sultone content of said sulfonation product mixture is less than 100 ppm and (d) recovering said alkali metal C8-22 .alpha.-olefin sulfates of light color and of low sultone content. A decrease in the sultone content from as much as 650,000 ppm to less than 50 ppm is possible by the method. - A -

264088

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