Patent ID: 6133489
Filing Date: 2000-10-17
Classification: C07C

Abstract:
A process for obtaining glycols with low aldehyde content from a glycol-containing mixture, which comprises:treating the surfaces of apparatus component made from corrodible material of a plant assembled for glycol recovery with phosphorous acid or a salt thereof, wherein the phosphorous acid or a salt thereof is added to glycol-containing mixture before or during the working-up of said mixture;subsequently recovering the glycol(s) by distillation; and optionally further pre-treating said plant used for the working-up of said mixture, in whole or in part, with said phosphorous acid or a salt thereof, wherein said surface treatment discontinuously takes place at least in those apparatus components of the plant which, permanently or temporarily, are in contact with a glycol in vapor form in the course of work-up of the glycol product.