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:
Feb. 17, 1981
Filed:
Mar. 29, 1979
Burton Brooks, Bellevue, WA (US);
The Chemithon Corporation, Seattle, WA (US);
Abstract
A relatively large amount of SO.sub.2 effluent gas from a sulfonation process is converted to SO.sub.3 and recycled back to the sulfonation process as part of the SO.sub.3 sulfonating agent. The rest of the SO.sub.3 used as the sulfonating agent is derived from a sulfur burner located downstream of the sulfonation operation and in the recycle path of the SO.sub.2 in the effluent gas. Hydrocarbons in the effluent gas are converted to CO.sub.2 and H.sub.2 O in the sulfur burner. The H.sub.2 O and SO.sub.3 are removed from the gas stream at an SO.sub.3 absorber which forms rich oleum from which the SO.sub.3 is subsequently removed for use in the sulfonation operation, leaving lean oleum which is used at the SO.sub.3 absorber to remove H.sub.2 O and SO.sub.3 from the gas stream. Gases leaving the SO.sub.3 absorber include some SO.sub.3 and are passed through an H.sub.2 SO.sub.4 absorber along with water and lean oleum to produce concentrated H.sub.2 SO.sub.4.