Metallgesellschaft Aktiengesellschaft

Bayer Aktiengesellschaft

Metallgesellschaft Aktiengesillschaft

Georg Schmidt

Hugo Grimm

Karl-Heinz Dorr

Egon Winkler

Nikola Anastasijevic

Rudolf Gerken

Michael Tacke

Hermann Wieschen

Dietrich Werner

Georg Daradimos

Roland Fach

Waldemar Weber

Hartmut Wagner

Christoph Mucke

Ekkehart Seitz

Hermann Muller

Franz-Ferdinand Sch&uuml;th

Anette Wingen

Ronald Apel

Peter-Bernhard Stougie

Achim Hollnagel

Dieter Knoblich

A catalyst for reacting SO with molecular oxygen to form SO is suited for a continuous operation at temperatures of 700&deg; C. and above, when the same consists of a carrier and an active component connected with the carrier, the active component consists of 10 to 80 wt-% iron, the carrier has a BET surface of 100 to 2000 m /g and an SiO content of at least 90 wt-%, and the weight ratio carrier:active component is 1:1 to 100:1.

Catalyst for oxidizing SO2 to SO3 and utilization of the catalyst in a method for producing sulfuric acid

Nitrosylsulphuric acid is mixed in a mixing reactor with sulphuric acid saturated with SO,. The acid mixture is led into a saturating reactor into the bottom region of which water and an SO,-containing gas are introduced. The gas partially serves as stripping gas inside the saturating reactor. SO,-saturated, No,-free sulphuric acid with 5 to 60 wt % H,SO,is removed from the bottom region of the saturating reactor and part thereof is mixed with nitrosylsulphuric acid in the mixing reactor.

Process for removing NOx from nitrosylsulphuric acid

Method of manufacturing sulphuric acid

A process for the recovery of sulfuric acid from waste sulfuric acid containing iron sulfate and from solid iron sulfate of high water content of crystallization which consists essentially of: A. concentrating waste sulfuric acid to an acid concentration of 25-55 weight percent, based upon the suspension, by removing water therefrom; B. mixing the concentrated acid of Step A with recycled concentrated sulfuric acid obtained from Step E to form a resultant acid mixture of acid concentration of 30-65 weight percent, based upon the suspension; C. adding said solid iron sulfate of high water content of crystallization to the acid mixture of Step B thereby obtaining iron sulfate of low water content of crystallization; D. separating the iron sulfate of low water content from the resultant sulfuric acid solution of Step C; E. concentrating the separated sulfuric acid solution of Step D to an acid concentration of 45-70 weight percent, based on salt-free acid, and recycling at least a portion thereof to Step B; and F. thermally decomposing the iron sulfate from Step D to produce iron oxide and sulfur dioxide.

Process for producing sulfuric acid from waste acid and iron sulfate

Sulfuric acid is produced from sulfur trioxide-containing humid gases by a process wherein the sulfur trioxide-containing humid gases are directly cooled with aqueous sulfuric acid, sulfuric acid is condensed and the gas is cooled below dew point of the sulfuric acid, and the water not required to form sulfuric acid is discharged as water vapor with the end gases.

Process for producing sulfuric acid

Growing community of inventors

Frankfurt am Main, Germany

Georg Schmidt