Method for separating paraxylene comprising adsorption with...

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 7/13 (2006.01) C07C 15/08 (2006.01)

Patent

CA 2275357

The invention concerns a method for separating paraxylene on a simulated fluid bed from a C8 feedstock comprising a step of adsorption on a zeolite and of desorption by a desorption agent delivering an extract and a raffinate and a step of crystallisation of the extract. A water supply is introduced in the feedstock, in the desorption agent and/or in a flux recycling current in the column, such that the weighted mean of water contents measured in the extract and in the raffinate ranges between 1 and 200 ppm. The S/F ratio of the flow rate of the desorption agent over that of the feedstock during the step of adsorption and desorption ranges between 0.6 and 2.5.

On décrit un procédé de séparation de paraxylène en lit mobile simulé à partir d'une charge en C8 comprenant une étape d'adsorption sur une zéolithe et de désorption par un désorbant délivrant un extrait et un raffinat et une étape de cristallisation de l'extrait. On introduit un débit d'eau dans la charge, dans le désorbant et/ou dans un courant de recyclage d'un flux dans la colonne, tel que la moyenne pondérée des teneurs en eau mesurée dans l'extrait et dans le raffinat soit comprise entre 1 et 200 ppm. Le rapport S/F du débit de désorbant sur celui de la charge lors de l'étape d'adsorption et de désorption est compris entre 0,6 et 2,5.

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