| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5a3016b5bca9e2143f428320348a3ff3 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01P2006-82 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C04B11-26
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B25-231
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C04B11-266
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B25-324
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01F11-46
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B25-2212
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01F11-466 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01F11-46
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B25-231
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B25-32
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B25-22 |
| filingDate |
2017-06-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_565c07d3e580a723bcaa2e399ebfa4d9
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d4173524c89b431221be23e2595ad6fe |
| publicationDate |
2019-03-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
CN-109476484-A |
| titleOfInvention |
Method for preparing calcium sulfate |
| abstract |
A method for preparing calcium sulfate, comprising: preparing DCP (dicalcium phosphate) by attacking a phosphate source by acid ; Decomposing the separated DCP by sulfuric acid under the condition of a first slurry of gypsum in an acidic aqueous phase of O 5 ; converting at least a portion of said first slurry by heating to a temperature above 80°C and optionally adding sulfuric acid, Dissolving the gypsum crystals and recrystallizing the dissolved calcium sulfate to form a second slurry of a-type calcium sulfate hemihydrate crystals suspended in an aqueous phase of phosphoric acid, wherein the content of free SO3 is less than 10 wt%, and, separating the aqueous phase and consisting of A filter cake formed from particularly pure a-type calcium sulfate hemihydrate. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-113443614-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-110282998-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2021062989-A |
| priorityDate |
2016-06-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |