http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-803172-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_2fa8f8941ecc2d9521285617dbb93322 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C255-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D209-48 |
| filingDate | 1956-05-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_37a34e8093bdfae4e3326ff5dad643f7 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_fa14208d0d137fd6390c0d4155afda2c |
| publicationDate | 1958-10-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-803172-A |
| titleOfInvention | Purification of phthalonitriles and/or phthalimide |
| abstract | Phthalonitriles and phthalimide prepared by the catalysed vapour phase reaction of xylenes with oxygen and ammonia are purified by washing the crude reaction product with water and passing an inert gas or vapour through the mixture at an elevated temperature. The amount of water used is at least two parts for each part by weight of the reaction product and the purification is carried out at 100-200 DEG C. The preferred inert gas is steam but other inert gases such as nitrogen, carbon dioxide, hydrogen or flue gas may be used. The washing and gassing processes may be carried out together by heating the mixture with water to boiling when the evolved steam (the inert gas) passes through the mixture and carries away the volatile impurities such as tolunitrile. In this preferred method the distillation is carried out at least until the weight of water distilled over equals the weight of product in the residue. The purified residue is cooled and washed with cold water. If the product is contaminated with ammonium carbonate or carbamate the aqueous mixture is first neutralized with acid before it is distilled. In examples terephthalonitrile, isophthalonitrile and a mixture of phthalonitrile and phthalimide are purified according to this preferred method. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6509490-B2 |
| priorityDate | 1956-05-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 41.