http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-916422-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c1cd6051bf69f25a0652ded4e4edac31 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C05B11-06 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C05B11-06 |
| filingDate | 1958-04-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5c0eacafd17d50f24d88c0ab10cc3705 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5a9c6031831c3f76adc5bfb738d5421b http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ea2a8e6f5911ea3be0eb695cc5acc0d2 |
| publicationDate | 1963-01-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-916422-A |
| titleOfInvention | Fertilizer materials |
| abstract | <FORM:0916422/III/1> A compound fertilizer is produced by reacting potassium chloride solid or solution with nitric and sulphuric acids to produce a liquid product containing free acid, removing nitrosyl chloride and chlorine formed, and treating the liquid product with phosphoric acid and/or phosphate rock. HNO3 may be 40-95%, H2SO4 may be 70-98% and the acids may be in mole ratio 1:10 to 10:1 with 1,3-2,5 moles mixed acids being used per mole KCl. The reaction may be at above 80 DEG C. under normal, sub-, or superatmospheric pressure and the water content of the mixed acids should be 20-40%. The acids should be at least 10% excess yielding a product containing KNO3 and KHSO4. The phosphate rock may be calcium or alumino phosphate particulate rocks and the phosphoric acid may be 50-70% to provide a P content at least 15%. When phosphate rock is used CaSO4 may be filtered off. The liquid product after phosphate treatment may be neutralized with 25-33% aqueous or anhydrous ammonia, or aqueous or anhydrous KOH or K2CO3 with vigorous agitation. The granulated dried product may be mixed with phosphate, superphosphates, potassium, or ammonium salts, or fillers, e.g. chalk, gypsum, or brick dust. Fertilizers with desired NKP ratios may be obtained by selection of proportions of reactants used. KCl and mixed HNO3 and H2SO4 are reacted in series-connected reactors 1, 2, 3, and the liquid product containing acids, KHSO4, and KNO3 is treated with phosphate rock in series-connected reactors 4, 5. CaSO4 is filtered off at 6 and the filtrate containing H3PO4, HNO3 and nitrates is neutralized to pH 4,5 in 7 with ammonia. The resulting product containing KNO3 and/or KHSO4, mono-ammonium phosphate, (NH4)2 SO4, with or without NH4NO3 is granulated and dried. The NOCl+Cl2 from 1, 2, 3 is washed with a countercurrent of conc. H2SO4 in 8 to yield Cl2+HCl gas, which is washed with H2O in 9 to yield Cl2, which is recovered, and aqueous HCl which may be passed to reactor 1 or recovered. The mixture of nitrososulphuric and sulphuric acids from 8 is contacted with H2O or dilute HNO3 and lair or O2 in 10 to yield a mixture of HNO3 and H2SO4, which is recycled to reactor 1, and oxides of nitrogen, which are converted to dilute HNO3 by H2O and O2 in 11. The HNO3 may be recycled to 10 or to reactor 1. Reactor 4 and filter 6 may be eliminated when H3PO4 is used alone and the product before ammoniation still contains bisulphate. |
| priorityDate | 1958-04-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 55.