Patent ID: 6294093
Filing Date: 2001-09-25
Classification: B01D

Abstract:
A stable aqueous formulation of a water-insoluble organic demulsifier consisting essentially of:a) a water-insoluble oil-soluble organic demulsifier;b) a water soluble surfactant; andc) balance water,wherein the water-insoluble oil-soluble organic demulsifer is a combination of a dicarbamate and a polyoxyalkylated alkylphenol resin, wherein the dicarbamate is the reaction product of from about 1% to about 15% by weight of toluene diisocyanate and from about 85% to about 99% by weight of an oxyalkylated polyol of formula:H(OCH.sub.2 CH.sub.2).sub.x (OR.sub.1).sub.y OR.sub.2where y is an integer from 2 to 70; R.sub.1 is a radical selected from the group consisting of ##STR4##R.sub.2 is a radical selected from the group consisting of --H and --CH(CH.sub.2 CH.sub.2 OH).sub.2 ; and x is an integer from 0 to 40; the polyoxyalkylated alkylphenol resin is an ethoxylated/propoxylated nonylphenol-formaldehyde condensate; and the water-soluble surfactant is a combination of sulfated nonylphenol ethoxylate and octylphenol ethoxylate in a ratio of surfactants of from about 0.2:1 to about 1.2:1.