40 CFR § 417.100 - Applicability; description of the air - SO3 sulfation and sulfonation subcategory.

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§ 417.100 Applicability; description of the air - SO3 sulfation and sulfonation subcategory.

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.