The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 28, 2001
Filed:
Nov. 22, 1999
Removal of by-products in method for processing a gas containing hydrogen sulfide and sulfur dioxide
Fabrice Lecomte, Rueil-Malmaison, FR;
Christian Streicher, Rueil-Malmaison, FR;
Cécile Barrere-Tricca, Paris, FR;
Institut Francais du Petrole, Rueil Malmaison Cedex, FR;
Abstract
A method for processing a gas, such as a Claus tail gas, containing at least hydrogen sulfide (H,S) and at least sulfur dioxide (SO,), includes the steps of contacting the gas with a liquid solvent, such as polyethylene glycol, containing at least one catalyst, such as sodium salicylate, in a contacting stage, recovering gaseous effluent substantially containing no hydrogen sulfide and no sulfur dioxide from the contacting stage, and separating liquid sulfur from liquid solvent in a decantation zone beneath the contacting stage. In order to remove by-products, such as sulfate and thiosulfate salts, resulting from degradation of the catalyst, a liquid fraction F containing at least solvent, catalyst, sulfur and the solid by-products resulting from degradation of the catalyst is extracted from the contacting stage and sent to a processing stage distinct from the contacting stage where the liquid fraction F is heated to a temperature sufficient to at least partially crystallize the by-products, and the crystallized by-products are separated from the rest of the liquid fraction F containing at least solvent. At least a stream F,comprising solvent, catalyst and sulfur and substantially free of the by-products and a stream F,mostly comprising the by-products are recovered.