Decarbonization of ammonium polyphosphate fertilizer solutions
US4157911A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1978 |
| Grant date | Jun 12, 1979 |
| Priority date | — |
| Expiry date | Oct 30, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05B13/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Ammonium polyphosphate fertilizer solutions contaminated with carbon and carbonaceous residues are decarbonized by a sequential treatment to produce a light-colored solution/slurry of fertilizer solution containing essentially no visible carbon. In the first step, a mixture of an organic amine with a quaternary ammonium salt is dispersed in the contaminated fertilizer solution. In the second step a water immiscible hydrocarbon of low polarity is incorporated into the fertilizer solution by low shear agitation. In the third step a very slow agitation of the mixed system provides for the rising and coalescence of the low density hydrocarbon droplets containing the carbonaceous particles into a layer above the fertilizer solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.