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. 18, 2000
Filed:
Nov. 21, 1997
Peter Schoubye, H.o slashed.rsholm, DK;
Haldor Topsoe A/S, Lyngby, DK;
Abstract
The present invention provides a process for concentrating sulphuric acids with concentrations of 90% to 98% H.sub.2 SO.sub.4 and temperatures of 160.degree. C. to 270.degree. C. into sulphuric acid with concentrations of 96% to 98.8% H.sub.2 SO.sub.4 by contacting the acid countercurrently in a packed tower with hot air or with hot process gas containing up to 6% SO.sub.3 and up to 30% H.sub.2 O and with inlet temperatures to the tower of 350.degree. C to 600.degree. C. The H.sub.2 O and H.sub.2 SO.sub.4 evaporated in the tower is contained in a stream of offgas from which the H.sub.2 SO.sub.4 thereafter is removed by controlled condensation The invention relates, in particular, to concentrating the product acid from wet gas sulphuric acid plants in which condensation of H.sub.2 SO.sub.4 takes place in the presence of excess H.sub.2 O in the process gas in air cooled, vertical glass tubes.