Patent ID: 8375971
Filing Date: 2013-02-19
Classification: B01F,F17D,Y10T

Abstract:
1. A method for reducing drag in a flowing water-based liquid system flowing in conduits for the efficient distribution of heat or cold, which method consists essentially of adding to the water-based liquid system a combination consisting essentially of: i.) a zwitterionic surfactant having the formula wherein R is a saturated or unsaturated aliphatic or acyl group with 10-24 carbon atoms, or a group R′NHC ii.) an anionic ether surfactant having the general structure or a mixture thereof, where R 1 is a hydrocarbon group of 10-24 carbon atoms, R 3 is an acyl group of 10-24 carbon atoms, A is an alkylene group having 2-4 carbon atoms, n is a number from 1 to 10, m is 1-4, B is a sulphate group OSO 3 M and D is a carboxylate group COOM, in which M is a cationic group; wherein the weight proportion between the zwitterionic surfactant and the anionic ether surfactant is from 100:1 to 1:1.