http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-102276423-B
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1f16aa167b8e1f5a0c331d809c3a55b6 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C39-08 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C37-05 |
| filingDate | 2011-06-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2013-08-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_42f9f0897e42408e3f724ed47cd83633 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_246270814d176b5a05c329680bcc6699 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d582a44d2457f011696a81026eb2465e http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b9417e984555a743943aa946d71b2b88 |
| publicationDate | 2013-08-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-102276423-B |
| titleOfInvention | Method for producing hydroquinone by direct hydrolysis of p-phenylenediamine |
| abstract | The invention discloses a method for producing hydroquinone by direct hydrolysis of p-phenylenediamine. The method comprises the steps of: adding sulfuric acid of certain concentration and p-phenylenediamine in certain ratio into a batching pot so as to form a p-phenylenediamine sulfate water solution, sending the p-phenylenediamine sulfate water solution from the batching pot to an autoclave, controlling the reaction temperature and conducting hydrolysis to the p-phenylenediamine sulfate, recovering part of water from the hydrolysate through flashing for batching use, neutralizing the hydrolysate to pH of 3-5 with an aqueous solution of ammonia or a caustic alkali water solution, then conducting extraction with an organic solvent, and recovering the extracting agent and refining the crude hydroquinone. The one-step hydrolysis employed in the invention can substantially reduce the sulfuric acid consumption, and has no need for sodium nitrite. The dilute sulfuric acid generated during the reaction has concentration less than 2%, and has low neutralization cost and less environmental pollution. |
| priorityDate | 2011-06-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 41.