Method for purification of polyethylene glycol by a product in the production of monoethylene glycol

摘要

the subject of the invention is a method of purifying ethylene glycol consisting mainly of monoethylene glycol, diethylene glycol and triethylene glycol as a by-product in the production of monoethylene glycol. the method involves mixing in order:, and.20 - 95% of ethylene glycol, consisting primarily of monoethylene glycol (40 to 70% by weight of di ethylene glycol (glycol), 20 to 40% by weight of) and triethylene glycol (8 - 15% by weight of); ii. 1 - 15% inorganic acid, preferably phosphoric acid v; (iii) 1 - 10% salt of carbonic acid and alkali metal, preferably sodium carbonate; iv.0 - 10% methyl alcohol, and the mixture of the resulting sludge treatment. the fluid may be used in refrigeration systems and assemblies.