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EC number: 220-543-9 | CAS number: 2802-68-8
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
Similar to all coordination complexes of boron trifluoride with organic and inorganic species (like alcohols, ethers, amines, sulfuric acid, sulfuric dioxide, etc) the complex of boron trifluoride and methanol is extremely water sensitive and reacts even with moist air.
In the instantaneous reaction with water as a first step methanol and boron trifluoride dihydrate are formed.
BF3·CH3OH + 2 H2O -> BF3· 2 H2O + CH3OH
The hydrolysis of borontrifluoride dihydrate was investigated at pH-values of 1.2; 4.0; 7.0 and 9.0 (BASF SE, Study No. 09S01179, 26.19.2009)
The hydrolysis of the test item is a very fast process (half-life < 30 minutes). Already at room temperature about 30 to 60% of the test item was hydrolyzed within minutes in all tested buffer solutions in the pH range 1.2 to 9.0.
The main reactions of the hydrolysis process are the following:
BF3.2H2O + H2O → B(OH)3+ 3HF
HF + BF3.2H2O → HBF4+ 2H2O
B(OH)3+ 4HF → HBF4+ 3 H2O
HBF4+ H2O ↔ HBF3(OH) + HF
Total hydrolysis of HBF4:
HBF4↔ HBF3(OH) ↔ HBF2(OH)2↔ HBF(OH)3↔ HB(OH)4= B(OH)3+ H2O
Boric acid and tetrafluoroborates are expected to be the main species in the dilute hydrolysis solution (Zhang Weijiang et al.).
References:
BASF SE, Boron trifluoride dihydrate: hydrolysis as a function of pH, Study No. 09S01179, 26.10.2009
Wamser C. A. Equilibria in the system boron trifluoride-water at 25 °C, Journal of the American Chemical Society, 1951, 73: 409-416
Zhang Weijiang et al., Equilibrium on the hydrolysis of Boron trifluoride in large amount of water, Transactions of Tianjin University, 2016, 22: 486-491
Key value for chemical safety assessment
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