http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-795816-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_4de0081a3cf10d0c0a788d61f253dae8 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C63-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C63-00 |
| filingDate | 1955-01-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1958-05-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-795816-A |
| titleOfInvention | Improvements in or relating to the oxidation of organic substances |
| abstract | Organic substances are oxidized to carboxylic acids with nitric acid and oxygen or molecular oxygen containing gases at elevated temperature and pressure in a process wherein the gases and vapours evolved in the reaction are passed upwardly into a tower filled with nitric acid of predetermined concentration and nitric acid is caused to flow back from the tower to the reactor in accordance with the amount of acid required (see Group III). Specified organic substances are paraffins, toluene, ethylbenzene, xylenes, p-cymene, chloro-toluenes, nitrotoluenes, toluenesulphonic acids, p - chloromethylbenzoic acid and coal or peat. In examples: (1) coal is oxidized with nitric acid and oxygen, regenerated nitric acid being recycled to the reactor, to give a mixture of polycarboxylic acids; (2) p-xylene is oxidized as in (1) but using air, to give terephthalic acid. By the use of suitable concentrations of acid in the tower and regulation of the flow of acid back to the reactor the oxidation may be conducted with constant, increasing, or decreasing concentrations of nitric acid, and when this latter condition is desired the flow of acid from the tower to the reactor may, alternatively, be prevented.ALSO:Organic substances are oxidized to carboxylic acids (see Group IV (b)) with nitric acid and oxygen or molecular oxygen-containing gases at elevated temperature and pressure, in a process wherein the gases and vapours evolved in the reaction are passed upwardly into a tower filled with nitric acid of predetermined concentration and nitric acid is caused to flow back from the tower to the reactor in accordance with the amount of nitric acid required. The gases and vapours leaving the reaction mixture contain <PICT:0795816/III/1> nitrous oxides and oxygen which are regenerated as nitric acid in the tower. In the accompanying drawing is shown an apparatus suitable for carrying out the process of the invention. The organic substance and nitric acid are introduced into the pressure vessel 1 having heating and cooling units 3, and oxygen or air is pumped in by compressor 2. The gases and vapours rise through the inverted U-tube 5, displacing the nitric acid therein and rise through the nitric acid in the tower 6. The tower contains filler bodies and is cooled. The volume and strength of the acid in the tower is increased and nitric acid may be returned, by way of valves 9 and 10 and siphon 11, to the reaction vessel. By the use of suitable concentrations of acid in the tower and regulation of the flow through valves 9 and 10, the oxidation may be conducted with constant, increasing or decreasing concentrations of nitric acid. In examples coal and p-xylene are oxidized in the apparatus described. |
| priorityDate | 1954-02-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 34.