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 29/76 (2006.01) C07C 29/80 (2006.01)

Patent

CA 2345140

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. According to the inventive method, the pressure dehydration column or at least the first pressure dehydration column of the cascade (2, 3, 4) has a stripping section with at least one separation stage, preferably 2-10 separation stages, especially 3-6 stages, and in that part of the top flow of the dehydration column(s) (2, 3, 4) is sluiced out with the stripping section.

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, par déshydratation sous vide suivie d'une distillation pure. Selon le procédé de l'invention, la colonne de déshydratation sous pression ou au moins la première colonne de la déshydratation sous pression de la cascade (2, 3, 4) présente une section de désorption ayant au moins un étage de séparation, de préférence 2-10 étages de séparation, plus particulièrement 3-6 étages de séparation, et la partie supérieure de l'écoulement de la colonne ou des colonnes de déshydratation (2, 3, 4) est déversée par la section de désorption.

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