| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0efa077d881a96aeb1e29b21ef1bbb58 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D307-88 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D307-88 |
| filingDate |
1978-01-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_caafaca8ac3da84303506ffe457eb7ca
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_281b2f3b8f0cf565d1eadb9788d7fa22 |
| publicationDate |
1979-08-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
DE-2803319-A1 |
| titleOfInvention |
METHOD FOR MANUFACTURING PHTHALIDE |
| abstract |
In the prodn. of phthalide, phthalic anhydride is subjected to catalytic hydrogenation in the gas phase at 150-280 degrees C and 20 bar using Cu-contg. catalysts. Phthalide is useful as an intermediate, e.g. for dyes and pharmaceuticals. Gas-phase hydrogenation avoids the need for sepg. the product from solvent. Conversion is >90% and yields are >85%. Pref. catalysts are Cu- and Al-contg. catalysts, e.g. those described in DT 2445303. Hydrogenation temp. is pref. 180-250 degrees C, and pressure is pref. 10 bar. The residence time of the reaction mixt. in the catalyst zone is pref. 1-100 seconds. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-9812187-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6028204-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6020501-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5296614-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-1097589-C
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0542037-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5969162-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-9801437-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-9800417-A1 |
| priorityDate |
1978-01-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |