http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-818214-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5c24684033fba97d1ad845ce453a57e3 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C17-395 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C17-38 |
| filingDate | 1955-12-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1959-08-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-818214-A |
| titleOfInvention | Process for isolating 4-chloro-meta-xylene and/or 2-chloro-meta-xylene from a mixture thereof |
| abstract | A mixture containing 2- and 4-chloro-m-xylenes is sulphonated and the crystalline 4-chloro-m-xylene sulphonic acid is precipitated from sulphuric acid of 80-100 (preferably 86-88) per cent strength; the precipitated product is separated and desulphonated by treatment with superheated steam in the presence of sulphuric acid to give 4-chloro-m-xylene. The mother-liquor on treatment with superheated steam in the presence of sulphuric acid gives a mixture rich in 2-chloro-m-xylene, which may be purified to give the product. The treatment with superheated steam in each case is preferably effected at 170-185 DEG C. An example is given of the sulphonation of a mixture of the chloro-m-xylenes in a solution of sulphuric acid, followed by cooling to 0 DEG C., when the 4-chloro product separates, and is filtered and decomposed with a mixture of sulphuric acid (97 per cent) and superheated steam, the mother-liquor being similarly treated. |
| priorityDate | 1954-12-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 18.