Process for the removal of contaminant from a hydrochlorofluoroolefin by extractive distillation
US9284241B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 2013 |
| Grant date | Mar 15, 2016 |
| Priority date | — |
| Expiry date | Feb 22, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07B2200/07
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for removing a contaminant from a hydrochlorofluoroolefin (such as trans-1,1,1-trifluoro-3-chloro-2-propene (1233zd(E))) includes extracting a chlorofluorocarbon (such as trichlorofluoromethane (R11)) from a mixture comprising the hydrochlorofluoroolefin and the chlorofluorocarbon using extractive distillation in the presence of an extractive solvent comprising a chlorinated compound to form a purified hydrochlorofluoroolefin. This separation method provides for removal of a contaminant, such as R11, from a hydrochlorofluoroolefin, such as 1232zd(E), which are not separable by conventional distillation methods. The method may employ a process utilizing two distillation columns, for example, a first extractive distillation column and a second solvent recovery column, which allows for recycle of the extractive solvent to the first extractive distillation column.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.