Purification of desflurane containing R-123
a technology of desflurane and r-123, which is applied in the field of purification of 2difluoromethoxy1, 1, 1, and 2tetrafluoroethane, can solve the problem of not being able to separate r-123 from desflurane by distillation
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[0018]To 28.5 kg of desflurane obtainable from the process described in Provisional Application Ser. No. 60 / 643,301 is added 2.5 kg of water. The mixture is then allowed to reflux for duration shown in the following table and both the overhead (O / H) and bottoms (B) samples are obtained and analyzed using GC.
[0019]
AfterRefluxingSampleHrs.DesfluraneR-123S / M—99.46%0.33%O / H7hrs.91.69%8.25%B7hrs99.97%168ppmO / H13hrs.92.63%7.32%B13hrs99.98%39ppmO / H16hrs.92.98%6.98%B16hrs99.99%21ppmO / H23hrs.94.89%5.08%B23hrs99.99%ppm
The column is locked off and drained, the material in the pot is distilled and fractions are collected after distilling 4 kg, 12 kg, 16 kg and 22 kg. These fractions are then analyzed using GC. Finally the total amount of material collected is analyzed. The results are shown in the table below.
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