http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-102659637-B
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b1b95a0151fe6cf57f119866e3a10c11 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C273-18 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C275-64 |
| filingDate | 2012-05-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2014-05-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_53c5517ed84f2a4ae9495f2ec0dc22a4 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d12ad798c2d003c6b5f18d2c06d13aa4 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1e9084102ae93c4f9bea8266c76924e3 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1bb01c33a0694322c1f718674684ad54 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7d131a181cd7a5c80ddd32647cf806c0 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f552185f1d110e79973de9e7115800bd http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_148b737455904e0f20c507e5a3ed1891 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b6faaed5a6b30739d4ab23a4d2f058a7 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_98c9d33941812b531a26f0c876b5b870 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0d7bf4f2cee30928066ef1e6c9221fa3 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_febf5462c271232ff4ce219493127003 |
| publicationDate | 2014-05-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-102659637-B |
| titleOfInvention | Method for preparing dihydroxyurea |
| abstract | The invention relates to a novel method for preparing dihydroxyurea and belongs to the field of organic synthesis. The dihydroxyurea belongs to a novel salt-free reducing agent which is used for spent fuel post treatment and has good application prospects. The novel method is mainly characterized in that under the anhydrous conditions, solid phosgene and hydroxylamine are used for synthesizing the dihydroxyurea. Concretely, hydroxylamine and potassium acetate are firstly placed into a three-opening flask, are placed into an ice salt bath and are stirred into emulsion. In addition, the solid phosgene is dissolved into 1, 4-dioxane, the mixed liquid is placed into a constant-pressure liquid dripping funnel, when the temperature is below 0 DEG C, the solid phosgene mixing liquid is dripped into the emulsion at the controlled speed, and the temperature is maintained at 0 to 5 DEG C. The reaction is continuously carried out for 2 hours after the dripping completion, and then, the pH of the solution is regulated to 2 to 3 through concentrated hydrochloric acid. Solid materials are removed through filtering, solvents are removed through rotary evaporation on filter liquid, and solid is obtained. A proper amount of tetrahydrofuran is used for extracting the dihydroxyurea in the solid, the solvents are removed through the rotary evaporation, coarse dihydroxyurea is obtained, ethanol is used for recrystallization, and the pure dihydroxyurea is obtained. Through the detection and characterization on products by various methods, the product purity is 95 percent, and the yield is 57 percent. |
| priorityDate | 2012-05-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 45.