15.
    发明专利
    未知

    公开(公告)号:BR9001939A

    公开(公告)日:1991-07-30

    申请号:BR9001939

    申请日:1990-04-26

    Applicant: HOECHST AG

    Abstract: In the novel process for the purification of an alkylene oxide adduct which has been prepared using halogen-containing metal catalysts and contains halogen-containing compounds and metals as impurities, the alkylene oxide adduct to be purified is treated with an excess of the alkali metal compound, and the alkaline mixture obtained is brought to a pH of not more than 7 using an acid, with the proviso that the amount of water present in the resulting product mixture is at least 0.1% by weight, relative to the weight of the product. This product mixture is freed from water and other solvents, as a result of which the salts insoluble in the alkylene oxide adduct precipitate in the form of coarse crystals and can be easily separated off to give the desired pure alkylene oxide adduct.

    17.
    发明专利
    未知

    公开(公告)号:FI885912A

    公开(公告)日:1989-06-24

    申请号:FI885912

    申请日:1988-12-21

    Applicant: HOECHST AG

    Abstract: In the process, a mixture of 99 to 5 mol % of at least one alkanol ethoxylate and 1 to 95 mol % of at least one carboxamide ethoxylate are reacted in the liquid state at 20 to 120 DEG C with 0.95 to 1 mol of chlorosulphonic acid or sulphur trioxide per 1 mol of -CH2CH2OH groups contained in the ethoxylates, and the reaction product is subsequently neutralised with an aqueous solution or suspension of an alkali metal, alkaline earth metal or ammonium hydroxide. This results in surfactant mixtures which are dissolved in water, contain ether sulphate and have a low content of 1,4-dioxane and which can be employed either directly or after low-cost removal of the small amounts of residual 1,4-dioxane as body care agents, dishwashing agents or detergents.

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