CsF-2.3HF

The objective compound of (CF3)3N is formed according to Equation 5.2.3 and/or Equation 5.2.4 through Equation 5.2.2  

the overall fluorination reaction can be written by Equation 5.2.5 and/or Equation 5.2.6  

The fluorination of (CH3)3N and/or (CH3)3NH cation proceeds though chemical reaction with fluorine radical (F-), which is generated electrochemically on the anode according to Equation 5.2.2, to form (CF3)3N according to Equation 5.2.3 and/or Equation 5.2.4. In this reaction, formation of perflu-orocompounds such as (CF3)3N from (CH3)3N and/or (CH3)3NH cation needs 18 fluorine radicals. In 

Current density (mA cm ) Cleavage compounds Fluorinated tertiary amines  

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Mechanism on fluorination of (CH3)4N and (CH3)3N is similar to that in Simons process. In the mixed melt of (CH3)3N mHF and CsF 2.3HF, the highly oxidized nickel fluoride of CsNi2F6 is formed on a nickel anode and it also fluorinates (CH3)3N to form (CF3)3N. 

The ratios of all constituents in the anode gas to overall anode gas in electrolysis of the mixed melt of (CH3)3N-5.0HF- -70wt% CsF-2.3HF at various current densities of 20-200 mA cm for 200hours with a BDD anode are summarized in Table 5.2.4. The viscosity of (CH3)3N-5.0HF-l-CsF-2.3HF melt increased with increasing ratio of CsF-2.3HF in the mixed melt [9], In the mixed melt of (CH3)3N-5.0HF-l-70 wt% CsF-2.3HF, the yield of (CF3)3N became higher than that in electrolysis of only the (CHjljN-wHF melt. This may be caused by an increase in the viscosity due to an increase in electrostatic interaction between species such as HF, anion, a partially fluorinated tertiary ammonium cation, and a partially fluorinated compound by adding CsF-2.3HF to a (CH3)3N-5.0HF melt, resulting in an increase in retention time of partially fluorinated tertiary amines with polarity in the mixed melt. 

Therefore, it is concluded that electrochemical fluorination of the mixed melt of (CH3)3N-5.0HF and CsF-2.3HF with a BDD electrode is useful for production of (CF3)3N. 

Table 5.2.4 The composition of anode gas in electrolysis of the mixed melt of (CH ) N-5.0HF + 70wt% CsF-2.3HF at room temperature...

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