METHOD FOR PRODUCING PURIFIED TRANS-1,2-DIFLUOROETHYLENE (HFO-1132(E)) AND/OR 1,1,2-TRIFLUOROETHYLENE (HFO-1123)
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United States of America Patent
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Issued Date -
May 18, 2023
app pub date -
Dec 20, 2022
filing date -
Dec 20, 2022
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Abstract
The present disclosure provides a method for producing purified trans-1,2-difluoroethylene (HFO-1132(E)) and/or 1,1,2-trifluoroethylene (HFO-1123), comprising a distillation step of distilling composition 1 comprising difluoromethane (HFC-32) and HFO-1132(E) and/or HFO-1123 to obtain composition 2 in which HFC-32 is reduced from composition 1; and an extractive distillation step of bringing composition 2 into contact with an extraction solvent to obtain a composition comprising HFO-1132(E) and/or HFO-1123, in which HFC-32 is reduced from composition 2, composition 2 being an azeotropic composition or azeotrope-like composition comprising HFC-32 and HFO-1132(E) and/or HFO-1123.
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