Method to improve yields of sodium hypophosphite
US4552737A · kind A · utility
1Cited by
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4Claims
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Key dates
| Filing date | Jan 13, 1984 |
| Grant date | Nov 12, 1985 |
| Priority date | — |
| Expiry date | Jan 13, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/165
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process of producing sodium hypophosphite (Na.sub.2 H.sub.2 PO.sub.2) is disclosed wherein the yield of the product is increased. The process comprises increasing the NaOH/P.sub.4 ratio above stoichiometric quantity to from about 2.4 to about 3.0 while maintaining a Ca(OH).sub.2 /P.sub.4 ratio of above about 1.21 in the reaction wherein phosphorus, sodium hydroxide, calcium, hydroxide and water are reacted to produce sodium hypophosphite. The invention further comprises a corresponding increase in dilution (H.sub.2 O/P.sub.4) to from about 38 to about 60.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.