Patent ID: 8278259

Claim:
A stable emulsion concentrate composition comprising a water phase and an oil phase, the composition comprising based on the whole concentrate 5-30 wt-% of one or more alkalinity source; 1-70 wt-% of at least one nonionic surfactant selected from the group consisting of: alcohol alkoxylates, alkyl phenol alkoxylates, alkyl thio alkoxylates, ethoxylate-propoxylate oligomers, alkoxylated esters, alkoxylated carboxylic acids, alkoxylated salts of carboxylic acids, ethers, amines, amine oxides, amides, and mixtures thereof; and 0.01-10 wt-% of at least one crosslinked or partly crosslinked polyacrylic acid or polymethacrylic acid or mixtures thereof as a thickener or stabiliser, wherein the concentrate allows purification of wastewater using membrane filtration units without blocking them or causing other damage to the membrane.