Method to neutralize and remove HF from a crude stream containing hydrochlorofluoroolefin
US11555002B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2019 |
| Grant date | Jan 17, 2023 |
| Priority date | — |
| Expiry date | Oct 10, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/42
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a step in the purification process of hydrochlorofluoroolefin refrigerants that are made from processes wherein 1,1,3,3 tetrachloropropene (R1230za) or 1,1,1,3,3-pentachloropropane (R240fa) is reacted with HF in excess. The purification process employs a cold-temperature reaction with a base to remove the HF and any HCl. The process prevents an increase in unwanted organic side-products, particularly trifluoropropyne (TPS), and simultaneously does not reduce the amount of the desired hydrochlorofluoroolefin refrigerant produced. The process also can have an optional step whereby hydrochlorofluoroolefin refrigerant and other organics are removed from aqueous process stream or streams resulting from the reaction with the base. The organics removed can be recycled. This optional step advantageously can increase the yield of the desired refrigerant, while decreasing the environmental load of the plant, by purifying the resulting aqueous process streams.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.