http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-312173-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_7b04f5b6a02051c94d6eaf190b751ed2 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-487 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-487 |
| filingDate | 1929-05-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1930-08-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-312173-A |
| titleOfInvention | Manufacture of glacial acetic acid from dilute acetic acids |
| abstract | 312,173. I. G. Farbenindustrie Akt.- Ges. May 18, 1928, [Convention date]. Right to Patent relinquished. Acetic acid is obtained from its aqueous solutions by first partially concentrating (to about 60 per cent) and then adding a substance, such as urea or other amide, p-toluidine, or an alkali acetate, which forms an addition compound with acetic acid, removing the remaining water by distillation or crystallization, and then decomposing the addition compound by heating to obtain the acid. The preliminary concentration is effected by cooling to -26‹ C. while stirring, precautions being taken to avoid supercooling, for which purpose ice crystals may be added. The ice crystals are separated, and may be washed or pressed to recover adhering acid. In the examples, (1) acetic acid of 20 per cent is run into acetic acid of 60 per cent, with stirring, at -26‹ C., the ice crystals being washed with 20 per cent acid; the 60 per cent acid thus obtained is treated with urea and cooled, with stirring, to about 0‹ C. and below: the addition compound is separated centrifugally at -17‹ C. and the acid is recovered by heating in a vacuum, the urea being then dissolved in the mother-liquor, concentrated until the solution contains acetic acid of 60 per cent, and used in the next operation; (2) acetic is concentrated to 60 per cent as above, the ice crystals being pressed to recover the adhering acid, leaving a solid block of ice; anhydrous potassium acetate is added to the 60 per cent acid and the mixture is cooled to -24‹ C. with stirring; potassium acid acetate with 2 molecules of acetic acid separates, and is heated in a vacuum to recover the acid; the mother-liguor contains potassium acetate and 38 per cent acid, and is returned to the process for the production of 60 per cent acid. |
| priorityDate | 1928-05-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 28.