http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-103058891-B
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_6875d7e2aadcd89466367124232eed2f |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D487-18 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C281-06 |
| filingDate | 2013-01-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2014-07-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_202366d8987c9568cfa45e411fa06772 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_125edb0e2e7ef84b58c1fedeafcbc9aa |
| publicationDate | 2014-07-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-103058891-B |
| titleOfInvention | Method for producing biruea and urotropine |
| abstract | The invention relates to a method for producing biruea and urotropine. The method comprises the following steps: letting excess carbon dioxide into a hydrazine hydrate solution to convert the hydrazine hydrate into carbohydrazide, continuously concentrating carbohydrazide through adopting a multiple-effect evaporator to obtain a carbohydrazide solution having a high concentration, adding urea, carrying out pressurizing condensation at 90-130DEG C to synthesize biruea, filtering and washing biruea after reaction ending, adding a formaldehyde solution to the obtained filtrate to react ammonium ions with formaldehyde in order to generate urotropine, carrying out evaporation gasification of the obtained solution after reaction ending to remove superfluous water, carrying out refrigerating crystallization, filtering, and refining the obtained filter cake to obtain urotropine. The method has the following advantages: excess carbon dioxide is let in to convert hydrazine hydrate into carbohydrazide, and carbohydrazide can be directly condensed with urea in the subsequent condensation reaction without adding sulfuric acid or hydrochloric acid, so the corrosion of the acid to equipment is reduced; and a byproduct ammonium carbonate or ammonium bicarbonate can react with formaldehyde to obtain urotropine having a high added value, so the ammonia nitrogen pollution is eliminated. |
| priorityDate | 2013-01-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 56.