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:
Dec. 11, 2018
Filed:
Dec. 15, 2015
Outotec (Finland) Oy, Espoo, FI;
Karl-Heinz Daum, Limburg, DE;
Peter Ernst, Hünstetten, DE;
Hannes Storch, Friedrichsdorf, DE;
Wolfram Schalk, Bad Homburg, DE;
Outotec (Finland) Oy, Espoo, FI;
Abstract
The invention describes a process for producing sulfuric acid by catalytic oxidation of SOto SOand subsequent absorption of the SOin sulfuric acid, wherein the SOis introduced into a first absorption stage (primary absorber) and at least partly absorbed there in concentrated sulfuric acid, wherein the SOnot absorbed in the first absorption stage is supplied to a second absorption stage (secondary absorber) for the further absorption in concentrated sulfuric acid, and wherein the sulfuric acid is cooled after passing through the two absorption stages. The cooling of the sulfuric acid is effected in at least two heat exchangers connected in parallel, wherein one of the at least two heat exchangers is operated as partial evaporator and is cooled with boiler feed water/steam and the other one is cooled with cooling water and operated as pure acid cooler.