Parachlorobenzotrifluoride

Parachlorobenzotrifluoride is a synthetic halogenated organic chemical compound with the molecular formula C7H4ClF3. It is frequently abbreviated PCBTF. Parachlorobenzotrifluoride is a colorless liquid with a distinct aromatic odor. PCBTF has been commercially-produced since the 1960s, initially as an intermediate in the production of other petrochemicals. But since the 1990s, it has been primarily used as a solvent.[1]

Parachlorobenzotrifluoride
Names
Preferred IUPAC name
1-Chloro-4-(trifluoromethyl)benzene
Identifiers
3D model (JSmol)
Abbreviations PCBTF
510203
ChemSpider
ECHA InfoCard 100.002.438
EC Number
  • 202-681-1202-681-1
MeSH C037723
UNII
UN number 2234
  • InChI=1S/C7H4ClF3/c8-6-3-1-5(2-4-6)7(9,10)11/h1-4H ☒N
    Key: QULYNCCPRWKEMF-UHFFFAOYSA-N ☒N
  • InChI=1/C7H4ClF3/c8-6-3-1-5(2-4-6)7(9,10)11/h1-4H
    Key: QULYNCCPRWKEMF-UHFFFAOYAI
  • C1=CC(=CC=C1C(F)(F)F)Cl
Properties
C7H4ClF3
Molar mass 180.55 g·mol−1
Appearance Colorless liquid
Melting point −36 °C (−33 °F; 237 K)
Boiling point 139 °C (282 °F; 412 K)
0
Vapor pressure 7.9
0.0347
Hazards
GHS labelling:
GHS02: FlammableGHS07: Exclamation markGHS09: Environmental hazard
Warning
H226, H315, H319, H335, H411
P210, P233, P240, P241, P242, P243, P261, P264, P271, P273, P280, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P370+P378, P391, P403+P233, P403+P235, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamond
1
2
1
Flash point 43 °C (109 °F; 316 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)
Infobox references

History

Occidental Chemical Corporation was a leading producer and sold it as part of its Oxsol® product line, specifically under the brand name of Oxsol 100.[2] Occidental Chemical Corporation sold the OXSOL line to an Israeli company, Makhteshim Agan Industries, Ltd., in 2002.[3]

Uses

PCBTF is increasingly used as a xylene replacement in cleaners, thinners, and other aromatic hydrocarbon blends.[1]

PCBTF is used as a component (5-12%) of low volatile organic compound (VOC) compliant polyurethane finishes.[4]

The substance is used as an ink solvent in the printing industry. Parachlorobenzotrifluoride has a high capacity for dissolving many inks used by the printing industry. In most cases, up to 22 grams of ink can be dissolved in 20 grams of PCBTF. An added benefit is that parachlorobenzotrifluoride dissolves most inks faster than toluene.

Health and Environmental effects

Health effects:

  • Points of entry: eyes, ingestion, inhalation, skin.
  • Target organs: central nervous system, kidneys, liver.
  • Irritancy: eyes, respiratory tract, skin[2]

In the troposphere, PCBTF has an estimated half-life of 67 days. It is transformed by reaction with photochemically-produced hydroxyl radicals to give mainly 2-chloro-5-trifluoromethylphenol.[1]

Regulation

PCBTF currently has VOC Exempt status from the U.S. Environmental Protection Agency.[5] However, California's Office of Environmental Health Hazard Assessment (OEHHA) has adopted inhalation risk factors for PCBTF as of June 2019, which could have implications for its ongoing VOC Exempt status.[6][7]

References
  1. Rayner-Canham, Geoff (March 2014). "Para-Chlorobenzotrifluoride (PCBTF) – the 'super-solvent'". Chem 13 News Magazine. The University of Waterloo. Retrieved 14 December 2022.
  2. MSDS provided by Islechem
  3. "Trifluoromethylbenzene 98-08-8" (PDF). National Cancer Institute. Retrieved 14 December 2022.
  4. see MSDS for MINWAX product numbers 13025(5%) and 71029(12%)
  5. "EPA Exempt Volatile Organic Compound: Parachlorobenzotrifluoride" (PDF). American Coatings Association. 2018-01-30. Retrieved 2019-03-20.
  6. "Chemical Listed Effective June 28, 2019 as Known to the State Of California To Cause Cancer: P-Chloro-a,a,a-Trifluorotoluene (Para-Chlorobenzotrifluoride, PCBTF)". oehha.ca.gov. Retrieved 2021-08-14.
  7. p-Chloro-α,α,α-trifluorotoluene (p-Chlorobenzotrifluoride, PCBTF) - Cancer Inhalation Unit Risk Factor Scientific Review Panel Draft - January 2020 - California Office of Environmental Health Hazard Assessment
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