http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-108929239-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B17-34 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C221-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B17-34 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C221-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C223-06 |
| filingDate | 2018-08-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2021-03-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2021-03-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-108929239-B |
| titleOfInvention | Preparation method of sodium polysulfide |
| abstract | A preparation method of sodium polysulfide, belonging to the technical field of chemical products. The method comprises the following steps: preparing sodium polysulfide; step two: refining p-aminobenzaldehyde; step three: recycling the residual waste liquid to prepare sodium polysulfide; the preparation method of sodium polysulfide provided by the invention adopts the reaction of sodium sulfide, caustic soda and sulfur to prepare the sodium polysulfide. The sodium polysulfide prepared by the method is added to react to prepare the para aminobenzaldehyde, and the water phase obtained by liquid separation after the reaction is used as waste liquid, wherein the main components are sodium sulfide, sodium polysulfide, sodium thiosulfate, sodium hydroxide, water, sodium hydrosulfide, unreacted sulfur and the like. And carrying out suction filtration on the waste liquid, removing unreacted sulfur, and continuously reacting the filtrate, sodium sulfide, caustic soda and sulfur to prepare sodium polysulfide. The method can realize recycling of the produced residual waste liquid and save resources. |
| priorityDate | 2018-08-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 35.