C
CHEMISTRY; METALLURGY
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C01
INORGANIC CHEMISTRY
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C01B
NON-METALLIC ELEMENTS; COMPOUNDS THEREOF;; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
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C01B17/00
Sulfur; Compounds thereof
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C01B17/69
Sulfur trioxide; Sulfuric acid
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C01B17/74
Preparation
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C01B17/76
by contact processes
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C01B17/80
Apparatus
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C01B17/806
Absorbers; Heat exchangers
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