Process for the combustion of sulphur for the preparation of oleum and sulphuric acid with reduced (NO)x content

US6893622B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Kurt-Wilhelm Eichenhofer
• Klaus-Peter Grabowski · Wermelskirchen, DE
• Günter Dräger · Leverkusen, DE
• Martin Kürten · Bensberg, DE
• Martin Schweitzer · Leverkusen, DE

Key dates

• Filing date: Aug 29, 2002
• Grant date: May 17, 2005
• Expiry date: Aug 29, 2022

Classification

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

Abstract

The invention relates to a process for the continuous preparation of oleum of a concentration of 10 to 45% by weight of SO3 and/or sulphuric acid of a concentration of 94 to 100% by weight of H2SO4 by combustion of sulphur with atmospheric oxygen according to the principle of superstoichiometric combustion, cooling the resultant sulphur-dioxide-containing gases to 350° C. to 500° C., catalytic conversion of these cooled gases to give sulphur-trioxide-containing gases in the presence of a vanadium-containing catalyst using single or double contact catalysis, absorption of the sulphur-trioxide-containing gases after cooling, if appropriate removal of liquids from the gases after absorption and energy recovery, with liquid sulphur being injected into the hot combustion gas stream perpendicular to the main direction of flow in the form of a fan using one or more bimodal fan-type nozzles.