Azeotrope-like composition containing 1,2-difluoroethylene or 1,1,2-trifluoroethylene and hydrogen fluoride
AssigneeDaikin Industries, Ltd.
InventorKazuhiro Takahashi
Life of this patent
Estimating the term…
Abstract
This disclosure provides a novel azeotrope-like composition and a separation method using the composition. The disclosure provides an azeotrope-like composition comprising 1,2-difluoroethylene (HFO-1132) and hydrogen fluoride; an azeotrope-like composition comprising 1,1,2-trifluoroethylene (HFO-1123) and hydrogen fluoride; and a separation method of a composition comprising hydrogen fluoride and at least one member selected from the group consisting of trans-1,2-difluoroethylene (HFO-1132(E)), cis-1,2-difluoroethylene (HFO-1132(Z)), and 1,1,2-trifluoroethylene (HFO-1123).
Claims5
An azeotrope-like composition comprising hydrogen fluoride and 99 mass % or more and less than 100 mass % of 1,2-difluoroethylene (HFO-1132), based on the total amount of HFO-1132 and hydrogen fluoride, defined as 100 mass %, and an additional compound in a total amount of more than 0 mass % and 15 mass % or less based on the entire azeotrope-like composition defined as 100 mass %, the additional compound being at least one member selected from the group consisting of 1,1-difluoroethylene (HFO-1132a), 1,1,2-trifluoroethylene (HFO-1123), fluoromethane (HFC-41), 1,1,2,2-tetrafluoroethane (HFC-134), and 1,1,2-trifluoroethane (HFC-143).
An azeotrope-like composition comprising 1,1,2-trifluoroethylene (HFO-1123), hydrogen fluoride, and an additional compound,
- the composition comprising the additional compound in a total amount of more than 0 mass % and 1 mass % or less based on the entire azeotrope-like composition defined as 100 mass %.
A separation method of a composition consisting of hydrogen fluoride and at least one member selected from the group consisting of trans-1,2-difluoroethylene (HFO-1132(E)), cis-1,2-difluoroethylene (HFO-1132(Z)), and 1,1,2-trifluoroethylene (HFO-1123),
- the method comprising steps (a) and (b), and optionally further comprising step (c):
- (a) supplying a composition comprising hydrogen fluoride and at least one member selected from the group consisting of HFO-1132(E), HFO-1132(Z), and HFO-1123 to a first distillation column;
- (b) obtaining, as a first distillate, an azeotrope-like composition comprising hydrogen fluoride and at least one member selected from the group consisting of HFO-1132(E), HFO-1132(Z), and HFO-1123, and extracting, as a bottom composition of the first distillation column, a composition that is more enriched in either i) at least one member selected from the group consisting of HFO-1132(E), HFO-1132(Z), and HFO-1123, or ii) hydrogen fluoride in terms of the concentration than the supplied composition;
- and
- (c) supplying the first distillate to a second distillation column to perform distillation in the second distillation column under a pressure different from that of the first distillation column.
Dependencies are inferred from the claim text.