http://rdf.ncbi.nlm.nih.gov/pubchem/patent/NL-7706397-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_889eccdd66f1daa32479b16f23cae904 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-265 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C67-39 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-39 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-265 |
| filingDate | 1977-06-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1977-10-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | NL-7706397-A |
| titleOfInvention | PROCESS FOR PREPARING PARA-TOLUENE ACID AND MONO-METHYLER EFTALATE. |
| abstract | p-Toluene acid (I) and monomethyl trephthalate (II) are prepd. by oxidn. of a mixt. of p-xylene and methyl p-toluate, in ratio by wt. of 2:1-1:4, with O2 or a gas contg. O2. in the liquid phase, using a catalyst which is a mixt. of (a) Mn or an Mn cpd. which is soluble in the reaction system, and (b) Co or a Co cpd. which is sol. in the reaction system, the gram-atom ratio of Mn:Co, as metals, is 1:99-90:10, and the total of (a)+(b) is 80-500 ppm. w.r.t. the reaction mixt., as metals. Oxidn. is at between 170 and 200 degrees C. The mixt. of (I) and (IIe is esterified with methanol, to form methyl-p-toluate (IV) and dimethyl terephthalate (III); III is recovered, and the remaining liquid, contg. Iv is recirculated, with fresh p-xylene, to the oxidn. reaction. (III) can be obtd. on the technical scale from p-xylene. Prodn of by-prods., e.g. CO2, CO or tarry materials is reduced; in partic., prodn. of p-cresol is reduced. The yield of (I)+(IIe is up to 10% higher than when a Co catalyst is used alone; the rate of reaction is high, without addn. of a lower fatty acid, e.g. acetic acid. The mixt. of I + II is very pure and has less colour and a lower content of fluorescent impurities. There is less corrosion of the plant, since fatty acid and halogen (cpds.) promoters are not present. |
| priorityDate | 1970-09-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 33.