METHOD FOR SEPARATING PARAXYLENE COMPRISING ADSORPTION WITH WATER INJECTION AND CRYSTALLISATION

摘要

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.