Process for the removal of iron and phosphate ions from a chlorinated hydrocarbon waste stream
US10717662B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2018 |
| Grant date | Jul 21, 2020 |
| Priority date | — |
| Expiry date | Oct 15, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2103/36
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A process for the simultaneous removal of iron and phosphate ions from a chlorinated hydrocarbon waste stream, such as a waste stream derived from a process for manufacturing 1,1,1,3,3-pentachloropropane (HCC-240fa) and/or 1,1,1,3-tetrachloropropane (HCC-250fb). The waste stream contains at least one of chlorinated hydrocarbons, tributyl phosphate (TBP) and/or triethyl phosphate (TEP), iron, FeCl2 and/or FeCl3, a TBP-FeCl2 complex and/or a TBP-FeCl3 complex, and a TEP-FeCl2 complex and/or a TEP-FeCl3 complex, and is subjected to thermal oxidation to generate a second, aqueous waste stream containing at least one of hydrogen chloride (HCl), FeCl3 and/or FeCl2, and H3PO4. The second waste stream is exposed to a base to generate a precipitate including at least one insoluble compound selected from the group consisting of FePO4, Fe(OH)3, and Ca3(PO4)2, and the precipitate is separated from the second waste stream to produce a liquid phase including only trace amounts of iron and phosphate ions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.