http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2011263904-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_9e15fb0227dc2b016e3ff32d5c8f5c00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_73cd10b49a1c1b2e5f175cd5c508996b http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_4cc2ca23e46d833f80f9763881eb6391 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_8c9b1ea610ad310a8124562b0a9ef5a3 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_868b79ca92ecc5095c2b21e184590b40 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C46-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C46-08 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C46-02 |
| filingDate | 2011-01-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_df7bae2055fb70474d958af408c71054 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e49303e9e6c565aa6d81755b00620e4f http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_dfcb55069f961ccb68034ddc1c06d410 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_46b0c036d4e35c08befe7575f401762e http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0d54a2cd2c8528024fd9445eeab84d35 |
| publicationDate | 2011-10-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-2011263904-A1 |
| titleOfInvention | Yield-efficient process for the production of highly pure 2-methyl-1,4-naphthoquinone and its derivatives |
| abstract | The present invention discloses a process for the production of 2-methyl-1,4-naphthoquinone and its bisulfite adducts, comprising the following steps:n a) oxidizing 2-methyl-naphthalene (2-MNA) to achieve an organic phase containing 2-methyl-naphthoquinone (2-MNQ) and 6-methyl-naphthoquinone (6-MNQ); b) subjecting said organic phase to treatment with an aqueous solution of a bisulfite salt to extract preferentially the 6-MNQ isomer from the organic phase; c) separating said organic phase from the aqueous phase; d) subjecting the organic phase of process step c) to a second bisulfidation step with an aqueous solution of a bisulfite salt, resulting in an organic phase containing 2-MNA and trace amounts of 2-MNQ and an aqueous phase containing 2-MSB and trace amounts of 6-MSB; e) optionally removing interfering bisulfite ions from the aqueous phase of process step c); f) raising the pH of the aqueous phase from step c) or e) to higher than 8.5 in the presence of a solvent resulting in an organic phase containing 2-MNQ; g) combining the organic phase from step f) with the organic phase being treated in the process step d); h) recycling the organic phase from step d) back to step a) to be used as solvent for the oxidation reaction of 2-MNA. |
| priorityDate | 2010-01-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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