http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DD-278587-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b452f386f6f825ea316b963b68cd363d |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C37-84 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C39-08 |
| filingDate | 1988-12-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6de9feda3705ab6c2699d09491100d61 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_26f3c4b1a8889cd7579310907d0b84f9 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_26b4702767098d4638980dbe3ad8e174 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6b3c2bfac2f91d9d5bbc03adea7708ed http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_2510c3a44c92141f101be304b9102f41 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_87c44686ba7dfb7c1b2efb4a1bc94c66 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0259954431dc15a0bfe4ddc8169c90b7 |
| publicationDate | 1990-05-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | DD-278587-A1 |
| titleOfInvention | METHOD FOR OBTAINING HIGH-PURITY BRENCE CATECHIN |
| abstract | The invention relates to a process for the continuous recovery of high-purity catechol from enriched melts from brown coal refining. A Hochbrenzcatechinhaltiges crude product having a seizure temperature of 425 K is supplied after cooling to 323-338 K in solidified form the head of a sump-heated crystallization column and passed in countercurrent to an ascending depleted melt, melted under heat absorption, passed lower melting impurities in the liquid phase and on Be withdrawn column head, while higher boiling components in crystalline phase go into the sump and the catechol is enriched according to its melting temperature at 378-383 K on a bottom of the crystallization column and withdrawn as a side stream. The higher melting ingredients of the crude product are kept at temperatures of 398-401 K by indirect heating in the sump melt liquor. If the crude product consists only of lower melting impurities and pyrocatechol, the sidestream decrease is eliminated, and the catechol is melt-liquefied in the sump at a temperature of 378-383 K to be set and withdrawn. The melt-liquefied pure catechol is then solidified by cooling under vacuum and discharged as a solidified crystallizate via a gas-tight lock. |
| priorityDate | 1988-12-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 30.