Process for the production of oleum and sulfuric acid

US5389354A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Karl Brandle
• Kurt-Wilhelm Eichenhofer
• Klaus Geisler · Bonn, DE
• Gunter Putz · Leverkusen, DE
• Klaus-Peter Grabowski · Wermelskirchen, DE

Key dates

• Filing date: Jan 18, 1991
• Grant date: Feb 14, 1995
• Expiry date: Jan 18, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/129
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In the continuous production of oleum having a concentration of 10 to 45% by weight SO.sub.3 and/or sulfuric acid having a concentration of 94 to 100% by weight H.sub.2 SO.sub.4 by burning sulfur with atomospheric oxygen on the principle of overstoichiometric or understoichiometric burning, cooling the resulting SO.sub.2 -containing gas to 390.degree.-480.degree. C., catalytically reacting the cooled gas to SO.sub.3 -containing gas on a vanadium-containing catalyst on the principle of single- or double-contact catalysis, absorbing the SO.sub.3 -containing gas after cooling and, optionally, separating liquid from the gas after absorption, followed by recovering energy, the improvement which comprises effecting the burning of the sulfur with atomospheric oxygen in the presence of a dry SO.sub.2 -containing gas which contains up to 5,000 ppm (NO).sub.x expressed as NO.