http://rdf.ncbi.nlm.nih.gov/pubchem/patent/RU-2009127514-A
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y02P20-582 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C59-185 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-56 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-573 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C69-738 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-083 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C67-313 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-56 |
| filingDate | 2007-09-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2011-01-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | RU-2009127514-A |
| titleOfInvention | IMPROVED METHOD FOR PRODUCING UNSATURATED CARBOXYLIC ACIDS ANHYDRIDES |
| abstract | 1. A method of obtaining anhydrides of unsaturated carboxylic acids of General formula I! ! in which R represents an unsaturated organic residue with 2-12 carbon atoms,! by reanhydridation of an aliphatic carboxylic acid anhydride by reaction with a carboxylic acid of general formula II! ! in which R has the above meaning,! in the apparatus, consisting of a reaction zone and a rectification column, characterized in that! a) the starting materials are fed into the reaction zone in stoichiometric ratios,! b) the carboxylic acid formed as a by-product is removed from the reaction mixture,! c) then the formed carboxylic acid anhydride of the formula I is distilled off,! d) unconverted starting materials are returned to the reaction zone,! e) the reaction zone contains a heterogeneous catalyst, and! f) add one or more polymerization inhibitors. ! 2. A method according to claim 1, characterized in that a heterogeneous catalyst is used in the entire reaction zone or in part of the reaction zone. ! 3. A method according to claim 2, characterized in that an acidic fixed catalyst is used. ! 4. The method according to claim 2, characterized in that a cation exchanger is used as the catalyst. ! 5. The method according to claim 1, characterized in that the catalyst is located in a separate part of the reaction zone. ! 6. A process according to one of claims 1 to 5, characterized in that the anhydride of the unsaturated carboxylic acid of the formula I is (meth) acrylic acid anhydride obtained by re-anhydride of acetic anhydride by reaction with (meth) acrylic acid. |
| priorityDate | 2006-12-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 22.