http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-4111882-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_f44ddbf555cb608b35e2a1acf517a77c |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C253-34 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C253-26 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D307-68 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C253-26 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C253-34 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D307-68 |
| filingDate | 1991-04-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d697b6a122981a386ddfb66ccbdb41ce http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_2dd0f1d25dadbd32b980806d2841aba7 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_caa2f593a8acdfadcfd48b6e1c510c48 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5f67da58d2e96ccc591142428465d965 |
| publicationDate | 1992-10-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | DE-4111882-A1 |
| titleOfInvention | METHOD FOR PRODUCING HIGH-BOILING NITRILS |
| abstract | Recovery of nitriles (I) with relatively high b.pt. from distn. residues (II) from acetonitrile (III) purificn., in the prodn. of acrylonitrile by ammonoxidation of propene, is carried out as follows. (a) The raw material, which is a liquid (II) contg. propionitrile (IA), crotononitrile (IB), 3-cyanofuran (IC) and benzonitrile (ID), obtd. in the purificn. of crude (III) before and/or after chemical treatment with HCHO and aq. NaOH soln., is cooled to 250-330 K, giving an upper organic phase (IV), which is sepd. from the lower aq. phase. (b) (IV) is neutralised to pH 3-6 with 2-18% aq. mineral acid and again sepd. from the acid aq. phase. (c) (IV) is freed from water by cooling, by treatment with salts or desiccants which can be regenerated and/or by azeotropic distn. (d) (IV) is sepd. by fractional distn. at 0.02-2 bar, using a column with a sepg. capacity corresp. to the equiv. height of 10-50 theoretical plates, giving fraction 1 of (IA), b.pt. 366-373 K, fraction 2 of (IB), b.pt. 388-398 K, fraction 3 of (IC), b.pt. 418-430 K, and distn. residue of (ID) at least from 458 K; and these fractions are purified further. ADVANTAGE - (I), which can normally be obtd. only by relatively costly multistage synthesis, sepn. and purifn. operations, can be recovered from (I |
| priorityDate | 1991-04-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 50.