40 CFR 417.100 - Applicability; description of the air
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The provisions of this subpart are applicable to discharges resulting from the manufacture of sulfonic acids and sulfuric acid esters by means of sulfation and sulfonation employing air and sulfur trioxide (SO3), in either continuous or batch processes.
Title 40 published on 2013-07-01
no entries appear in the Federal Register after this date.