---
kind: "section"
citation: "40 C.F.R. § 417.100"
title: "40"
number: "417.100"
heading: "Applicability; description of the air—SO 3 sulfation and sulfonation subcategory."
url: "https://uscodex.org/cfr/40/417.100"
---

# §417.100. Applicability; description of the air—SO 3 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.


## Notes

### Authority

Authority: Secs. 301, 304 (b) and (c), 306 (b) and (c), and 307(c) of the Federal Water Pollution Control Act as amended, (the Act); 33 U.S.C. 1251, 1311, 1314 (b) and (c), 1316 (b) and (c) and 1317(c), 86 Stat. 816 et seq.; Pub. L. 92-500.

### Source

Source: 39 FR 13372, Apr. 12, 1974, unless otherwise noted.