Diethylenetriaminepentaacetic acid → Acrylamide-acrylic acid resin

Participants

Reaction Steps

A water-in-oil emulsion of an acrylamide/acrylic acid copolymer is prepared by dissolving 334.5 g of acrylamide and 138.3 g of acrylic acid in 302.5 g of water. The pH of the resulting aqueous solution is adjusted to 6.5 by the addition of a 50 percent aqueous solution of NaOH. To this solution is added 0.3 g of the pentasodium salt of diethylenetriaminepentaacetic acid and 5.1 g of a polyethylene glycol ether of a secondary alcohol sold by Union Carbide under the trade name Tergitol 15-S-9 (inverting surfactant). The total weight of this aqueous phase is adjusted to 1260 g by the addition of water. This aqueous phase is then dispersed in an oil phase which contains 457.8 g of liquid hydrocarbon, 12.3 g of isopropanolamide of oleic acid (emulsifier) and 10.2 g of sorbitan monooleate (emulsifier). The resulting emulsion is charged into a jacketed liter glass reactor equipped with a stirrer, a nitrogen sparger, a thermometer, and gas exit. A free-radical initiator is added and the reactor containing the emulsion is sparged with nitrogen for about 1 hour to remove oxygen. The emulsion is then subjected to polymerization conditions as described in U.S. Pat. No. 3,284,393 to form a water-in-oil emulsion of acrylamide/acrylic acid copolymer (preconcentrate emulsion).

Provenance & Evidence