375-83-7Relevant articles and documents
A novel liquid plasma AOP device integrating microwaves and ultrasounds and its evaluation in defluorinating perfluorooctanoic acid in aqueous media
Horikoshi, Satoshi,Sato, Susumu,Abe, Masahiko,Serpone, Nick
experimental part, p. 938 - 942 (2012/03/08)
A simplified and energy-saving integrated device consisting of a microwave applicator and an ultrasonic homogenizer has been fabricated to generate liquid plasma in a medium possessing high dielectric factors, for example water. The microwave waveguide and the ultrasonic transducer were interconnected through a tungsten/titanium alloy stick acting both as the microwave antenna and as the horn of the ultrasonic homogenizer. Both microwaves and ultrasonic waves are simultaneously transmitted to the aqueous media through the tungsten tip of the antenna. The microwave discharge liquid plasma was easily generated in solution during ultrasonic cavitation. The simple device was evaluated by carrying out the degradation of the perfluorooctanoic acid (PFOA), a system highly recalcitrant to degradation by conventional advanced oxidation processes (AOPs). PFOA is 59% degraded in an aqueous medium after only 90 s of irradiation by the plasma. Intermediates were identified by electrospray mass spectral techniques in the negative ion mode.
Yield improvement in the electrochemical production of pefluorooctanoic acid
Napoli, M.,Scipioni, A.,Gambaretto, G. P.,Carlini, F. M.,Bertola, M.
, p. 261 - 264 (2007/10/02)
The possibility of obtaining real yield improvements in the industrial electrochemical production of perfluorooctanoic acid is discussed on the basis of recent experimental data obtained using perfluorohexyl acetyl chloride in place of octanoyl chloride as a starting material.In particular, the effect of the non-formation of cyclic byproducts on the yield of perfluoro-octanoic acid has been examined, as well as considering previous results obtained starting from a different partially fluorinated precursor, 4-perfluorobutyl butanoyl chloride.The yield of perfluoro-octanoic acid from perfluorohexyl acetyl chloride was less than expected, because of an accompanying increase in perfluoro-n-heptane formation.
