http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-318939-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_60def0e9458a372bf14aa5cb6da4d017 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_6f7fce5e0565aa9f98ae0688dbced816 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C45-80 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C45-81 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C45-80 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C45-81 |
| filingDate | 1928-05-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1929-09-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-318939-A |
| titleOfInvention | Improvements in and relating to the separation, isolation, and purification of aromatic hydroxy aldehydes |
| abstract | 318,939. Graesser-Monsanto Chemical Works, Ltd., and Hudson, D. P. May 11, 1928. Vanillin; p-hydroxybenzaldehyde; salicylaldehyde; bourbonal. - Aromatic hydroxyaldehydes are separated from closely related phenolic compounds by selective acidification of the alkali metal salts thereof, or by selective neutralization of the frec phenols. An immiscible solvent for the free phenol may be added when separation is effected by acidification of the alkali salts and a solution of the phenols in an immiscible solvent may be treated with a limited quantity of aqueous alkali. According to examples; (1) a mixture of vanillin and isovanillin, dissolved in caustic soda, is treated with carbon dioxide; isovanillin is precipitated. The crude vanillin obtained by methylation of protocatecheuic aldehyde may be used as starting material ; (2) a mixture of salicylic aldehyde and p-hydroxybenzaldehyde is dissolved in caustic soda and treated with sulphuric acid. The salicylicaldehyde which is first liberated may be extracted with a solvent: (3) guaiacol is similarly separated from vanillin : (4) a mixture of bourbonal and µthacol (monoethylcatechol) is shaken with a quantity of normal caustic soda equivalent to the bourbonal, and the mixture extracted with ether to remove the µthacol: (5) vanillin is extracted from a powdered mixture of vanillin and isovanillin by means of normal caustic soda. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4847422-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2004054954-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4474994-A |
| priorityDate | 1928-05-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 40.