http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-772895-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_22b76668de84d54b953b471058f94cc7 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_a825367e6db11ba64cd01f96c37d8bee |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C201-08 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C205-06 |
| filingDate | 1954-11-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1957-04-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-772895-A |
| titleOfInvention | Method for trinitrotoluene manufacture |
| abstract | Trinitrotoluene is prepared by treating mononitrotoluene and/or dinitrotoluene in countercurrent in a series of nitrators and separators with nitration acid containing 86-95 per cent sulphuric acid, 0.5-14 per cent nitric acid and 0-13.5 per cent water and which may contain a small amount of sulphur trioxide. The nitrators and separators are arranged in pairs, the nitrated product from one nitrator being separated from nitration acid in the separator <PICT:0772895/IV(b)/1> <PICT:0772895/IV(b)/2> <PICT:0772895/IV(b)/3> before passing to the next nitrator in the series, the acid phase passing to the previous nitrator, so that acid and nitrotoluenes flow countercurrently through the system. In Figs. 1 and 2, nitrotoluene from storage A flows to nitrator 1a and 2a, is separated from nitration acid in separator 3a and passes via 6a to nitrator 1b and 2b and so on, the trinitrotoluene product emerging from separator 3f via overflow 6f. Nitration acid from storage B is fed to nitrator 1f and 2f, is separated in 3f passing via 7f to nitrator 1e and 2e and subsequently to each nitrator in turn, finally emerging as spent acid from overflow 7a of separator 3a. Storage tanks C and D supply make-up acid comprising a mixture of concentrated nitric acid and oleum, and concentrated nitric acid respectively. The trinitrotoluene leaving the system via 6f is washed successively with water, sodium bicarbonate solution, sodium sulphite solution and water and is dried. The composition of the nitration acid varies throughout the system within the limits given above. Fig. 3 shows a nitrator 1 and 2 round which nitrotoluene and nitration acid is circulated by pumping and mixing wheel 10, part of the mixture being continuously led to separator 3 from which separated nitrotoluenes pass via 6 to the next nitrator in the series, part of the separated acid phase passing back to 1 and 2 via 8 and 19, and the remainder passing to the previous nitrator in the series via 7. The acid phase in the nitrators is maintained at not less than 80 per cent of the total volume of reaction mixture present, and the temperatures of the nitrators in the series range from 65 DEG to 90 DEG C. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4022844-A |
| priorityDate | 1953-12-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 34.