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| vinyl chloride | |
|---|---|
| Name | Vinyl chloride |
| IUPAC name | Chloroethene |
| Other names | Vinyl chloride monomer |
| CAS number | 75-01-4 |
| Formula | C2H3Cl |
| Molar mass | 62.5 g·mol−1 |
| Appearance | Colorless gas |
| Melting point | −154 °C |
| Boiling point | −13.4 °C |
| Solubility | Slightly soluble in water |
vinyl chloride Vinyl chloride is a colorless, flammable gas with the chemical formula C2H3Cl used primarily as the monomer for polyvinyl chloride production. It has significant industrial importance in the petrochemical and plastics sectors and has been the subject of major public health, environmental, and regulatory attention. Major corporations, regulatory agencies, and international treaties have influenced its production, control, and remediation.
Vinyl chloride emerged as an industrial chemical during the expansion of the Petrochemical industry and the growth of companies such as Dow Chemical Company, BASF, Union Carbide Corporation, DuPont, and Eastman Chemical Company. The monomer fuels large-scale polymerization operations producing Polyvinyl chloride, which in turn services sectors including Construction of the United States, Automotive industry, Medical device industry, Packaging and labeling, and Electrical wiring. Historical incidents involving vinyl chloride storage and release prompted scrutiny by agencies including the United States Environmental Protection Agency, Occupational Safety and Health Administration, European Chemicals Agency, and the World Health Organization.
Commercial vinyl chloride production is dominated by routes developed within the Chemical industry such as the thermal cracking of chlorinated hydrocarbons and the hydrochlorination of acetylene. Major feedstock pathways include ethylene-based processes linked to Steam cracking, Ethylene dichloride production, and electrolytic chlorination associated with firms like Shell plc, ExxonMobil, Chevron Phillips Chemical Company, and SABIC. Large chemical complexes in regions such as Gulf Coast, Texas, Ruhr, Yangtze River Delta, Persian Gulf, and Singapore host integrated facilities owned by conglomerates like LyondellBasell Industries, INEOS, Formosa Plastics Group, and Mitsubishi Chemical Corporation. The Haber–Bosch–Wacker style integrations and partnerships among Royal Dutch Shell, TotalEnergies, and national oil companies affect feedstock availability, while trade agreements and tariffs negotiated at forums like the World Trade Organization influence international flows.
Vinyl chloride is classified as a substituted alkene; its double bond adjacent to a halogen makes it reactive in addition and polymerization reactions familiar to practitioners trained at institutions such as Massachusetts Institute of Technology, Imperial College London, and ETH Zurich. It undergoes radical and ionic polymerizations catalyzed by initiators and co-catalysts developed in research at labs such as Bell Labs, DuPont Central Research, and BASF Research. Reactions include hydrolysis, radical addition, and low-temperature chlorination producing byproducts like 1,2-dichloroethane and unsaturated chlorinated species studied in journals published by American Chemical Society and Royal Society of Chemistry. Thermochemical decomposition pathways under fire conditions produce phosgene and hydrogen chloride; combustion behavior is analyzed using standards from American National Standards Institute and National Fire Protection Association.
The dominant application is as the monomer for Polyvinyl chloride (PVC) used in piping, flooring, window frames, and medical tubing supplied to construction and healthcare contractors including Bechtel Corporation, Fluor Corporation, and Jacobs Engineering Group. Vinyl chloride-derived PVC is also used by manufacturers such as Fisher-Price, Whirlpool Corporation, and Siemens in consumer goods and electrical insulation. Specialty polymer chemistry enables additives and copolymers employed in BASF SE and Evonik Industries product lines for applications in Aerospace Corporation components, marine fittings, and packaging supplied to retailers like Walmart and IKEA.
Human exposure to vinyl chloride has been linked to hepatic angiosarcoma, a rare liver cancer first characterized in occupational cohorts at facilities run by Union Carbide and studied by epidemiologists affiliated with Johns Hopkins University, National Institute for Occupational Safety and Health, and Harvard School of Public Health. Toxicological assessment by the International Agency for Research on Cancer classified vinyl chloride as a Group 1 carcinogen. Acute exposures cause central nervous system depression and respiratory effects documented in case reports associated with incidents investigated by Centers for Disease Control and Prevention and Occupational Safety and Health Administration. Chronic exposure risks informed workplace standards set by OSHA and public health guidance from World Health Organization and European Chemicals Agency emphasize medical surveillance practices used in clinics at Mayo Clinic and Cleveland Clinic.
Environmental contamination events around chemical plants, notably incidents involving companies such as Bayer, Monsanto, DuPont, and Formosa Plastics prompted remediation led by agencies including the United States Environmental Protection Agency, Environmental Protection Agency (Australia), and provincial bodies in Ontario and Quebec. Vinyl chloride in groundwater and air is monitored under regulatory frameworks such as the Safe Drinking Water Act, Comprehensive Environmental Response, Compensation, and Liability Act, and the European Union REACH Regulation. International cooperation through fora like the Stockholm Convention and reports by United Nations Environment Programme inform cleanup technologies (bioremediation, air stripping, advanced oxidation) developed at universities including UC Berkeley, University of Tokyo, and ETH Zurich.
Industrial safety protocols for vinyl chloride incorporate engineering controls, leak detection systems, and emergency response plans coordinated with local authorities such as United States Coast Guard and National Transportation Safety Board for transport incidents. Personal protective equipment standards referenced to National Institute for Occupational Safety and Health and American Conference of Governmental Industrial Hygienists govern workplace exposure limits; trade unions like United Steelworkers and professional societies such as American Industrial Hygiene Association participate in occupational training. Fire safety and spill management follow guidance from National Fire Protection Association standards and involve coordination with contractors certified under programs run by International Organization for Standardization and American Society of Mechanical Engineers.