Processes for producing organophosphorous compounds
US10239901B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 2016 |
| Grant date | Mar 26, 2019 |
| Priority date | — |
| Expiry date | Sep 7, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D9/0054
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to processes for producing organophosporous compositions having low acid content as well as processes for reprocessing partially degraded organophosporous compositions that contain high levels of phosphorous acid. In one embodiment, a process comprises: (a) receiving a solid organophosphite compound that has been recrystallized or triturated, wherein the solid organophosphite compound comprises phosphorous acid; (b) dissolving the solid organophosphite compound in an organic solvent; (c) treating the solution with a weakly basic adsorbent; and (d) collecting the treated organophosphite solution, wherein the acid content of the organophosphite following step (d) is 30 ppm or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.