Method for producing highly pure monoethylene glycol

Details Method for producing highly pure monoethylene glycol Method for producing highly pure monoethylene glycol

C - Chemistry, Metallurgy

07

C

C07C 29/80 (2006.01) C07C 29/10 (2006.01) C07C 31/20 (2006.01)

Patent

CA 2345053

The invention relates to a method for obtaining highly pure monoethylene glycol from the product of hydrolysis of ethylene oxide by distillation, by means of dehydration under pressure, preferably in a cascade, vacuum dehydration and subsequent pure distillation. During the vacuum dehydration, an aqueous stream containing monoethylene glycol in a concentration of less than I wt. %, preferably less than 0.1 wt. %, medium boilers and lightboilers is drawn off and then sluiced out, optionally after reprocessing.

La présente invention concerne un procédé d'obtention de monoéthylène glycol à partir du produit d'une hydrolyse de l'oxyde d'éthylène par distillation, par déshydratation sous pression, de préférence en cascade, déshydratation sous vide suivie d'une distillation pure. Au cours de la déshydratation sous vide, un courant aqueux contenant du monoéthylène glycol ayant une concentration moins d'un 1 % en poids, en ébullition moyenne et en ébullition légère est prélevé, éventuellement après retraitement.

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