ES367572A1 - New procedure for the manufacture of foam surfaces of weak power. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

New procedure for the manufacture of surfactants with low foaming power corresponding to the general formulas: to) **(See formula)** b) **(See formula)** c) **(See formula)** d) **(See formula)** where: "A" indicates an ethylene group;-CH2 CH2 "B" indicates a substituted ethylene group: **(See formula)** "R" can be a methyl or ethyl group. "m" is an integer greater than 10 and less than 200. "n" is an integer greater than 20 and less than 600. Procedure characterized by the following sequence of operations: A) The starting amine undergoes a decarbonization and dehydration process based on: 1º Treatment of the amine with solid potassium hydroxide. 2nd. Settling of the aqueous layer. 3rd Distillation of the dry amine in an inert atmosphere and eventually under vacuum. Always working in an inert atmosphere and closed systems. B) On a mole of the starting amine, at a temperature between 60º-80ºC and at 0.2-2 atmospheres, as many moles of propylene or butylene oxide as there are active hydrogens are added. C) Add 0.01 - 0.2% of a catalyst consisting of a liquid alloy of alkali metals, generally sodium-potassium, and then propylene oxide, or butylene oxide or a mixture of both in proportions of 5/95 to 95/5 at temperatures between 90 and 130ºC, the addition of oxide is carried out in a unique way and eventually in a staggered way with intermediate additions of the same catalyst. D) After a further addition of the same catalyst, ethylene oxide is added under the same conditions as propylene oxide. E) The final product, nonionic with weak foaming power, is neutralized with phosphoric or nitric acids so that a 10% solution or dispersion has a pH of 7 - 7.5. (Machine-translation by Google Translate, not legally binding)