C - Chemistry – Metallurgy – 11 – D
Patent
C - Chemistry, Metallurgy
11
D
C11D 1/83 (2006.01) C11D 3/02 (2006.01) C11D 3/08 (2006.01) C11D 3/12 (2006.01) C11D 3/36 (2006.01) C11D 11/00 (2006.01) C11D 1/06 (2006.01) C11D 1/12 (2006.01) C11D 1/14 (2006.01) C11D 1/29 (2006.01) C11D 1/72 (2006.01) C11D 1/722 (2006.01)
Patent
CA 2295015
A process for washing laundry is provided in which a washing alkali component and a surfactant component are combined with water to form a wash liquor, the wash liquor is combined with laundry in a standard washing machine for institutional laundries, and the wastewater from the wash is treated by membrane filtration, where the throughflow rate is reduced by less than 10 percent over an operating time of 120 hours. The washing alkali component is composed of an anionic surfactant and a water-soluble silicate; an alkali metal hydroxide and a complexing agent; or an anionic surfactant and water-soluble silicate and an alkali metal hydroxide, a complexing agent, or a mixture of an alkali metal hydroxide and a complexing agent. The surfactant component is composed of a nonionic surfactant selected from the group consisting of C8-18 fatty alcohol alkoxylates containing at least 5 alkoxy groups, C8-18 fatty alcohol ethoxylates containing at least 7 ethoxy groups, C8-18 fatty alcohol ethoxylate/propoxylates containing at least 4 ethoxy groups and at least 2 propoxy groups in the molecule, and mixtures thereof.
Procédé de lavage du linge, en particulier de vêtements de travail, consistant à laver le linge dans une machine à laver de type couramment utilisé dans les blanchisseries industrielles, avec une combinaison de produits comprenant au moins deux composants: (A) un composant alcalin de lavage renfermant (A1) un tensioactif anionique et un silicate soluble dans l'eau et/ou (A2) un hydroxyde alcalin, et (A3) un complexant, et (B) un composant tensioactif renfermant de préférence un tensioactif non ionique, et à traiter les eaux résiduaires dans une installation de filtration sur membrane. La combinaison de produits utilisée, formée des composants A et B, n'entraîne, contrairement aux agents connus lors du traitement des eaux résiduaires par filtration sur membranes, aucune influence défavorable dans la mise en oeuvre du traitement des eaux, en particulier, aucun colmatage des membranes.
Merz Thomas
Schnepf Christine
Shamayeli Khalil
Henkel-Ecolab Gmbh & Co. Ohg
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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