http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-102976914-B
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_714bd29897a50eef9aa31c8761eec053 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C50-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C46-02 |
| filingDate | 2012-12-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2015-01-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5879dc224b3d253b7e66b04792be628f http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_fb759f218c1ad5eb4d53d795baf547ac http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_772b0d40b7168b385f0dc0762df4eab9 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_aa115d463f079961beea42fc378df0e6 |
| publicationDate | 2015-01-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-102976914-B |
| titleOfInvention | Method for preparing p-benzoquinone |
| abstract | The invention discloses a method for preparing p-benzoquinone, which comprises the following steps of: (1) adding manganese dioxide into an oxidation tank with dilute sulphuric acid, and sufficiently dissolving the manganese dioxide; (2) at a temperature lower than 20 DEG C, dropwise adding aniline into the oxidation tank, and sufficiently stirring to enable the manganese dioxide to oxidize the aniline; and (3) after the oxidation reaction, distilling, crystallizing, dehydrating and drying to obtain the p-benzoquinone. According to the invention, in the step (1), the concentration of the dilute sulphuric acid is 38% by mass; before the manganese dioxide is added, a catalyst cerous sulfate is firstly added into the oxidation tank; and after the cerous sulfate is sufficiently dissolved, the manganese dioxide is added, and air is introduced into the solution. By adding the catalyst cerous sulfate in the key step and introducing air into the solution, the yield of the p-benzoquinone can be remarkably increased; and the method also has the advantages of low cost, simple technology, easiness in operation and the like. |
| priorityDate | 2012-12-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 37.