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:
Jul. 15, 1980
Filed:
Jun. 05, 1978
Walter Kerner, Huerth-Hermuehlheim, DE;
Paul Schmitz, Noervenich-Dorweiler, DE;
Davy Powergas GmbH, Cologne, DE;
Abstract
An improved process for the production of concentrated sulfuric acid from H.sub.2 O- and SO.sub.2 -containing gases by the oxidation of the SO.sub.2 thereof in a plurality of contact stages while lowering the temperature of the gases, thereby condensing the sulfuric acid therefrom, comprises cooling a portion of the sulfur dioxide-containing gases exiting from a combustion or cracking furnace by contacting them with cooling water, the water vapor contained in the gases thereby being partially condensed-out or separated-off. The resulting cooled gases with reduced steam content are recycled into the furnace and, by the selection of the cooling temperature of the recycled gas, the H.sub.2 O/SO.sub.2 mol ratio in the combustion or cracking gases is adjusted within the range of from 1.0 to 1.25, and the remaining portion of the sulfur dioxide-containing gases, i.e., those which are not recycled, is fed to contact oxidation stages.