http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-4413580-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c7ad58d3c0b071069a8ee0cb8c8ba2e8 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01J31-0212 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C263-04 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C263-04 |
| filingDate | 1994-04-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c2e05ed842b7503d7be8a7dfcdd3e1b5 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6243a001838b1124dc658333ed323d6d http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_549132de8b59ce65cd143de7c1fafde3 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_46b782108182ea5e6c7b2d6a130e2243 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d8778126ec45bddfc7c5bc8ae6405549 |
| publicationDate | 1995-10-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | DE-4413580-A1 |
| titleOfInvention | Process for the preparation of 1,4-diisocyanatobutane (BDI) |
| abstract | Prodn. of 1,4-butylene diisocyanate (I) comprises (a) converting 1,4-butanediamine (II) to a dialkyl or diaryl 1,4-butanedicarbamate (III) and (b) thermally decomposing (III) at 100-600 deg C. and fractionally condensing the decompsn. prods. to give (I) and the corresp. alcohol or phenol (IV). Step (a) is pref. effected by (i) reacting (III) with urea and an alcohol at elevated temp., opt. in the presence of a catalyst, and opt. removing the NH3 formed, or (ii) reacting (II) with a dialkyl carbonate in the presence of a basic catalyst, esp. NaOMe. In case (i), the alcohol should have a b.pt. more than 10 deg C. below that of (I), and is esp. n-butanol. In case (ii), the dialkyl carbonate should be such that (IV) has a b.pt. more than 10 deg C. below that of (I), and is esp. dimethyl carbonate. Step (b) is effected at 180-300 deg C. and 1-500 mbar in the liq. phase, opt. in a high-boiling inert solvent, with continuous distn. of the decompsn. prods., followed by fractional condensn. to give a (I)-rich fraction and a (IV)-rich fraction, both of which are purified by fractional distn.. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0795543-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5883291-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-9856758-A1 |
| priorityDate | 1994-04-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 184.