NSPS Notebook
VOC Emissions from Synthetic Organic Chemical Manufacturing Industry: Distillation Operations -  Subpart NNN

Applicability: eCFR Subpart NNN [ecfr.gov]

This subpart applies to:
  1. Affected facilities that are part of a process unit that produces any of the chemicals listed in 40 CFR 60.667 as a product, co-product, by-product, or intermediate, and that commence construction, modification, or reconstruction after Dec 30, 1983.
Affected facilities:
  1. Distillation units not discharging their vent stream into a recovery system;
  2. Combination of distillation unit and the recovery system into which its vent stream is discharged;
  3. Combination of two or more distillation units and the common recovery system into which their vent streams are discharged.

Not subject to this subpart:
  1. Distillation units operating as part of a process unit that produces coal tar or beverage alcohol.
  2. Distillation units that do not use, contain, or produce VOC.
  3. Distillation units subject to NSPS DDD.
  4. Distillation units that are designed and operated as batch operations.
Partial exemptions*:
  1. Affected facilities with a total resource effectiveness (TRE) index value greater than 8.0;
  2. Affected facilities in a process unit with a total design capacity for all chemicals produced within that unit of less than one gigagram per year;
  3. Affected facilities operated with a vent stream flow rate less than 0.008 scm/min.
*These facilities must comply with certain testing, recordkeeping and reporting requirements. Please see the rule text for full details.

(See 40 CFR 60.660 (d) for information about alternative means of compliance)
Known Sources in NDEE Jurisdiction:
Date of Original Final Rule: 6/29/90
Amendments Dates: 02/27/2014 (79 FR 11251)
12/14/2000 (65 FR 78268)
10/17/2000 (65 FR 61744)
11/27/1995 (60 FR 58237)
09/07/1990 (55 FR 36932)
State Regulations: Title 129, Chapter 12, Section 001.65

Previously: Chapter 18, Section 001.61
Federal Regulations: 40 CFR 60.660
Related Rules:

NSPS - 40 CFR Part 60

Subparts VV and VVa - SOCMI leaks
Subpart III - SOCMI air oxidation unit
Subpart DDD - VOC Emissions from the Polymer Manufacturing Industry
Subpart RRR - SOCMI reactor processes

NESHAP - 40 CFR Part 63
Subpart FFFF - Misc. organic chemical production & processes (MON)
Subparts F/G/H - HON (hazardous organic NESHAP)
Subpart J - Polyvinyl chloride and copolymers production,
Subpart DDDDDD - Polyvinyl chloride and copolymers production,
Subparts U/W/JJJ/OOO - Polymers & Resins
Subpart XX - Ethylene mfg,
Subpart PPP - Polyether polyols production,
Subpart HHHHH - Miscellaneous coating mfg,
Subpart VVVVVV - Chemical mfg,
Subpart BBBBBBB - Chemical preparation
Subpart CCCCCCC - Paints and allied products mfg
Regulations and Federal Registers: eCFR Subpart NNN [ecfr.gov]
FAQs, Fact Sheets, and Rule Summaries: TCEQ Flowchart [tceq.texas.gov]
Other Information and Resources:
Page Last Updated: 12/21/22