Patent ID: 8841503

Claim:
A process for the adsorption-separation of a feed stream into an extract product, containing a defined ratio of extract to impurities, from a raffinate product, in which a head-flush purge fluid is removed from a process vessel containing an adsorption bed and at least one equalization chamber, comprising: I. passing an internal process fluid into the equalization chamber in a process vessel having at least one rounded head, II. passing a head-flush fluid into the equalization chamber, III. withdrawing a head-flush purge from the equalization chamber comprising varying ratios of the extract and impurities to a withdrawal pump, IV. measuring the contained ratio of extract to impurities in the purge, and V. distributing the purge through a valving system to: (a) a raffinate stream when the weight ratio of extract to impurities in the purge is less than the weight ratio in the extract product, and, (b) an extract stream when the weight ratio of extract to impurities in the purge is substantially equal to or greater than the weight ratio in the extract product, and, VI. repeating step V according to the determination of the weight ratio of extract to impurities in the purge.