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    • 3. 发明申请
    • METHOD OF LAUNDERING ITEMS AND PURIFYING WASTE WATER THEREFROM
    • 洗涤物品和净化废水的方法
    • WO1997004060A1
    • 1997-02-06
    • PCT/US1996009904
    • 1996-06-11
    • UNILEVER N.V.TIBBITTS, Dave
    • UNILEVER N.V.
    • C11D03/02
    • C11D11/0076C11D3/046C11D3/1213
    • A method of laundering oily items comprises laundering said items in a wash solution which includes a surfactant system and a source of alkalinity. The source of alkalinity is an alkali metal aluminate preferably sodium aluminate at a concentration effective to have at least about 25 ppm of the alkali aluminate present in the wash solution measured as alumina. The wash solution is then separated from the laundered items and its pH reduced to about 9 or less. A destabilizing polymer such as diallyldimethyl ammonium chloride can be added. This combination causes the oil and grease to separate from the wash solution and float to the surface along with the sodium aluminate. If the concentration of the sodium aluminate is above about 100 ppm preferably about 250 ppm, there is no need to add the destabilizing polymer. This does not affect the overall efficiency of the detergent, yet significantly improves the ability to separate the oil and grease from the waste wash solution.
    • 洗涤油性物品的方法包括在包括表面活性剂体系和碱源的洗涤溶液中洗涤所述物品。 碱度的来源是碱金属铝酸盐,优选铝酸钠,其浓度有效地以氧化铝测定洗涤溶液中存在的碱金属铝酸盐的至少约25ppm。 然后将洗涤溶液与洗涤物品分离,并将其pH降低至约9或更小。 可以加入去稳定的聚合物如二烯丙基二甲基氯化铵。 这种组合使得油和油脂与洗涤液分离并与铝酸钠一起漂浮到表面。 如果铝酸钠的浓度高于约100ppm,优选约250ppm,则不需要加入去稳定化聚合物。 这不会影响洗涤剂的整体效率,但是显着提高了从废洗涤溶液中分离油和油脂的能力。