Product recovery from adsorption-separation purge fluids
AssigneeUop LLC
InventorsJason T. Corradi, James W. Harris, Lewis H. Pettengill
Life of this patent
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Abstract
Purge fluid from a vessel head in an adsorption process is distributed to recovery processes according to the purity of product contained in the fluid. Extract-rich fluid thus is routed directly to recovery of the extract product. Distribution preferably is determined by internal positioning of feed, desorbent and product streams in the adsorption vessel.
Claims7
A process for the adsorption-separation of a mixed-C8-aromatics feed stream into a meta-xylene product containing a defined ratio of meta-xylene to C8-aromatic impurities and 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:
- a. passing an internal process fluid into the equalization chamber in a process vessel having at least one rounded head,
- b. passing a head-flush fluid into the equalization chamber,
- c. withdrawing a head-flush purge from the equalization chamber comprising varying ratios of meta-xylene and impurities,
- d. measuring the contained ratio of meta-xylene to impurities in the purge,
- e. distributing the purge through a valving system to:
- i. a raffinate stream when the weight ratio of meta-xylene to impurities in the purge is less than the weight ratio in the extract product, and
- ii. an extract stream when the weight ratio of meta-xylene to impurities in the purge is substantially equal to or greater than the weight ratio in the extract product, and,
- f. repeating step e. according to the determination of the weight ratio of meta-xylene to impurities in the purge.
Dependencies are inferred from the claim text.