C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/111
C01B 17/765 (2006.01) C01B 17/50 (2006.01) C01B 17/775 (2006.01) C01B 17/80 (2006.01)
Patent
CA 1297267
- 1 - METHOD AND APPARATUS FOR MAKING SULPHURIC ACID ABSTRACT OF THE DISCLOSURE Sulphur-containing material is passed into a thermal cracker where sulphur dioxide is formed, the necessary heat being generated by burning a carbon-containing fuel. Oxygen-rich gas, preferably pure oxygen, is used to support the combustion and a gas mixture including, after drying, more than 16% (preferably at least 25%) by volume of sulphur dioxide and at least 30% (preferably at least 60%) by volume of carbon dioxide. The mole ratio of the mixture is adjusted by addition of oxygen-rich gas (preferably pure oxygen) upstream of a catalytic converter. In each stage of the converter reaction takes place between sulphur dioxide and oxygen to form sulphur trioxide which is absorbed to form sulphuric acid. Oxygen is also added between the first and second stages and preferably the second and third stages of the converter. High production rates of sulphuric acid for a given size of converter and from low value sulphur-containing materials are made possible. MW/NJP/8535 USA
519291
Gowling Lafleur Henderson Llp
The Boc Group Plc
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