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EC number: 204-126-9
CAS number: 116-14-3
Evidence from TFE manufacture and polymerisation in aqueous media above ambient temperature show that TFE does not readily undergo hydrolysis. Furthermore, the hydrolysis of TFE in the environment is of little relevance, since its high volatility and low water solubility will cause it to volatilise rapidly from water bodies.
A priori, it cannot be concluded that TFE is unlikely to
undergo hydrolysis, since:
H2O + CF2=CF2→HCF2CF2OH→
HCF2COF + HF
HCF2COF + H2O → HCF2COOH + HF
Nevertheless, evidence from PTFE manufacturing indicates TFE clearly
does not readily undergo hydrolysis. In the pyrolysis
reaction to make TFE from chlorodifluoromethane TFE is in contact with
hot steam. No reaction with water is known. If there was a reaction it
would not be possible to make TFE by this route. In the autoclaves, TFE
is polymerised at elevated temperature and pressure in the presence of
water in the pH range of 4 to 10. There is no evidence of the presence
of the potential hydrolysis product 1,1,2,2-tetrafluoroethanol at the
end of these polymerisation reactions. Furthermore, the hydrolysis of
TFE in the environment is of little relevance, since its high volatility
and low water solubility will cause it to volatilise rapidly from water
bodies. Therefore, in accordance with section 1, subsection 1.2 of REACH
Annex XI, Weight of Evidence, the study does not need to be conducted.
Coffman DD, Raasch MS, Rigby GW, Barrick PL, Hanford WE, 1949. Addition
reactions of tetrafluoroethylene. Journal of Organinc Chemistry 14, 747
Harmer MA, Junk C, Rostovtsev V, Carcani LG, Vickery J, Schnepp Z, 2007.
Synthesis and applications of superacids. 1,1,2,2 -tetrafluorosulphonic
acid, supported on silica. Green Chemistry 9(1), 30 -37.
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