Mercaptan gas odorant (tert-butyl mercaptan / THT)

Arkema S.A. (Colombes, France; Euronext: AKE; ~€11B revenue 2023; specialty chemicals and advanced materials) is the world's largest producer of tert-butyl mercaptan (TBM), the primary natural gas odorant compound used across North America and much of Europe. Arkema's Lacq, France facility — located in the historic Lacq natural gas field in the French Pyrenees — is the dominant global TBM production site. Arkema also produces ethyl mercaptan (EM) and other thiol compounds. TBM production at Lacq leverages proximity to historic sulfur byproducts from the local natural gas field; Lacq was France's primary natural gas production region from the 1950s through the 1990s. Arkema also supplies mercaptans for industrial chemical synthesis (pharmaceuticals, rubber additives, lubricant additives) through its Thiochemicals business line. Arkema's broader portfolio includes high-performance polymers (PEBA, PVDF), adhesives (Bostik), and coating solutions (Coatex).

French specialty chemicals company; world's leading ethyl mercaptan producer. Beaumont, TX is the sole US production site for propane odorant ethyl mercaptan. In 2023, Arkema produced 11,000+ MT of mercaptans total, supplying gas odorants to 200+ distribution companies globally across Europe, North America, and Asia-Pacific. Arkema also produces mercaptan blends (SPOTLEAK, VIGILEAK) for natural gas odorization. Separate from mercaptans, Arkema operates specialty polymers, adhesives, and coating resin businesses. Also notable for the September 2017 Arkema Crosby TX peroxide plant fire — a different Arkema facility near Houston that caught fire during Hurricane Harvey when refrigeration failed, causing explosion and evacuation.

Major US petrochemical company (JV between Chevron and Phillips 66); produces ethyl mercaptan at Borger, TX and Tessenderlo, Belgium (Tessenderlo expanded 65% in 2017). Ethyl mercaptan is part of a broader organosulfur chemicals portfolio including methyl mercaptan, DMDS (dimethyl disulfide), and specialty sulfur chemicals. Applications: gas odorization, polymer modifiers, agricultural chemicals, pharmaceuticals, water purification, and lubricant additives. Tessenderlo capacity expansion noted by Hydrocarbon Processing (2017). Also the world's leading polyethylene producer (Cedar Bayou, TX cracker complex).

Evonik Industries AG (XETRA: EVK; Essen Germany; MDAX listed); world's largest DL-methionine producer under the MetAMINO brand. Total DL-methionine capacity exceeds 700,000 MT/year across three continental hubs: Jurong Island Singapore (~340,000 MT/year — world's largest single methionine complex, expanded +40k MT August 2024), Theodore Mobile County Alabama USA (~245,000 MT/year), and Antwerp Belgium (~120,000 MT/year). The Wesseling Germany DL-Met line closed Q1 2021 as Evonik consolidated production to the three-hub network. Evonik first commercialized DL-methionine synthesis in the 1950s under predecessor Degussa. MetAMINO is Evonik's largest single product. ~30-32% global market share. In February 2022 Evonik announced a $176.5M investment in a new methyl mercaptan (MMP intermediate feedstock) plant at the Alabama site.

Innospec Inc. (Englewood CO; NASDAQ: IOSP; ~$2.1B revenue 2023) is a specialty chemicals company whose Fuel Specialties segment includes natural gas odorants. Innospec sells odorant blends under the Gasodor® brand — including Gasodor S-Free (a non-TBM blend for underground storage applications) and THT-based odorants for European gas networks. Innospec sources mercaptan active ingredients from Arkema and CPChem and formulates/distributes to gas utilities. Innospec's Fuel Specialties segment also includes fuel additive packages, lubricity additives, and flow improvers for petroleum fuels. Innospec (formerly Associated Octel) has a UK operating base in Ellesmere Port, Cheshire.

Natural Gas Odorizer Inc. (Asbury Environmental Services subsidiary; US) is a downstream odorant distribution and injection equipment company serving natural gas utilities and pipeline operators. NGO formulates and distributes TBM, EM, and blend odorants; provides odorant injection skid equipment and field technical services. NGO and similar odorant injection service companies represent the last mile of the mercaptan supply chain — they take bulk mercaptan from Arkema/CPChem, blend to customer specifications, and manage the hazmat logistics of delivering highly concentrated mercaptan to utility injection points across the US distribution network.