Patent ID: 7902137
Filing Date: 2011-03-08
Classification: C11D

Abstract:
1. A concentrated alkaline cleaning composition consisting of: (a) a biodegradable scale control system consisting of two components selected on the basis of two different mechanisms of action, one of which is a biodegradable sequestrant and the other of which is a biodegradable chelant, present in a combined amount of greater than about 25 wt. %, based upon the total weight of the concentrated composition; (b) a hydrotrope consisting of an alkyl glucoside, a polyalkylglucoside, sodium xylene sulfonate, octylbetaine, or octyl dimethylamine oxide; (c) sodium hydroxide or potassium hydroxide, or mixtures thereof, present in an amount greater than about 7% active alkali content; (d) a corrosion inhibitor; and (e) water, wherein the pH of the composition is greater than about 12 and maintains an alkaline pH throughout the cleaning process, and wherein the concentrated composition possesses and maintains scale control properties at low use-dilutions of 1/40 ounce up to no greater than 1/10 ounce per gallon of water.