http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-768076-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_14f86e164bb6ab1032c519b42ff81a64 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C201-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C201-12 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C201-16 |
| filingDate | 1955-03-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1957-02-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-768076-A |
| titleOfInvention | Recovery of 3-chloronitrobenzene |
| abstract | 3-Chloronitrobenzene is obtained from mixtures comprising nitrobenzene and the 2-, 3-and 4-chloronitrobenzenes by sulphonating the mixture with oleum to preferentially sulphonate the nitrobenzene and the 2- and 4-chloronitrobenzenes and then separating the water-soluble sulphonated derivatives by treatment with water. The above mixture is prepared by chlorination of nitrobenzene, and the residual unsulphonated 3-chloronitrobenzene is normally contaminated with dichloronitrobenzenes from which it is separated by fractional freezing at temperatures up to about 40 DEG C., or by fractional distillation. The sulphonation is effected using oleum of from 1-30 per cent or more strength (free SO3), in the temperature range of 40-120 DEG C., preferably between 70 DEG and 95 DEG C., and the weight ratio of oleum to the mixture of chlorinated nitrobenzenes is between 0.5 : 1 and 10 : 1. In examples: a crude mixture of chlorinated nitrobenzenes is added to 10 or 20 per cent oleum and after heating to 85 DEG C. the mixture is diluted and washed with water, leaving 3-chloronitrobenzene as an oil which is purified by fractional distillation or freezing. U.S.A. Specification 1,759,554 is referred to. |
| priorityDate | 1955-03-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 25.