Preparation of color-stable, light-colored, aqueous salt pastes

Details Preparation of color-stable, light-colored, aqueous salt pastes Preparation of color-stable, light-colored, aqueous salt pastes

1984-04-26

1985-10-15

Evans, J. E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14390

Patent

active

045473188

ABSTRACT:
This invention is directed to a process for the preparation of color-stable, light-colored aqueous salt pastes of wash-active esters of .alpha.-sulfofatty acids with monohydric C.sub.1 -C.sub.8 -alcohols by a combined bleaching treatment of dark-colored .alpha.-sulfofatty acid ester salt paste with hydrogen peroxide and alkali metal hypochlorite. According to the process, dark-colored .alpha.-sulfofatty acid ester salt paste is first subjected in a preliminary bleaching step to bleaching with alkali metal hypochlorite in a neutral to mildly alkaline aqueous medium, any excess metal hypochlorite is removed, and the paste is subjected in a final bleaching step to bleaching in a mildly acidic medium with hydrogen peroxide or with one or more compounds which yield hydrogen peroxide.

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patent: 3485856 (1969-12-01), Weiss et al.
patent: 4080372 (1978-03-01), Stein et al.

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