| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_a0ed73939602610d8853f9990158fc88 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D307-08 |
| filingDate |
1981-02-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5a40bac0220b3c7d1f8abb8984b6aed6
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a47c4cabc492ee3863f72284bf8f8074
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_9aac4dd34d0de629033a9ec20bfb8ad3
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f4bd78a88f2fee6ac93d35ca1824c9d5
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_39232cfe00b130acc1ed858a09bdb6f8
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_28a17cd138bfd2cada6060ff29524bd5
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ad7461004bcfd89af7af2097c22bb4bf
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4c4cc94c46fce8d42ceb6102da986615
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_62715b2bb6eb7f11052ef4c2e0ef11fe
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_cc5124db948191d3fc32406787585742 |
| publicationDate |
1984-02-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
DD-160742-A3 |
| titleOfInvention |
METHOD FOR THE CONTINUOUS GAINING OF TETRAHYDROFURAN FROM TETRAHYDROFURANE-METHANOL CONDENSES |
| abstract |
The invention relates to a process for the continuous recovery of high purity tetrahydrofuran from technical mixtures with methanol. The overall process consists of the process steps of extraction and molecular sieving. The extractants used are alkali liquors in the concentration range between 20 and 50% by mass, which are injected into several elevations of a countercurrent extractor. The tetrahydrofuran obtained after molecular sieving over synthetic zeolites of the type 4A has a methanol content <0.02% by mass, water is undetectable (Fischer's method). The process is applicable to the purification of by-products of polybutylene terephthalate synthesis. |
| priorityDate |
1981-02-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |