http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-960746-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_70ec63d39d6704bacc5c7068c93ded43 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C2603-24 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C39-11 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C37-88 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C39-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C37-84 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C41-46 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C39-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C41-40 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C43-1782 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C43-178 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C37-84 |
| filingDate | 1962-09-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1964-06-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-960746-A |
| titleOfInvention | A process for preparing finely-divided crystals of phenolic compounds |
| abstract | In a process for preparing crystals of phenolic compounds having at least one hydrocarbon or hydroxy hydrocarbon radical ortho to the phenolic hydroxyl group, there is included in the solvent from which the phenolic compound is crystallized urea, preferably in the range of .001-1% by weight based on the phenolic compound. The solvent is preferably a liquid hydrocarbon or halohydrocarbon such as paraffin or cycloparaffin having from 5-10 carbon atoms in the molecule such as pentane, hexane, cyclohexane, heptane, octane, iso-octane or decane; the solvent may also be an aromatic hydrocarbon having up to 10 carbon atoms in the molecule e.g. benzene, toluene, xylene or ethyl benzene or a haloparaffin such as chloroform or carbon tetrachloride. Separate solutions of the phenolic compound and of the urea are prepared and the two solutions are then mixed to precipitate phenol and urea either immediately or after cooling. Many compounds are exemplified of (1) the formula: <FORM:0960746/C1/1> in which R is a hydroxy-benzyl or an alkyl radical, preferably an alkyl radical having up to 8 carbon atoms, and branched on the alpha carbon atom; R1 is alkyl radical, hydroxyalkyl radical, hydroxylaralkyl radical, hydroxyaryl radical or hydroxyaralkyloxy radical, and x is an integer from 0 to 2. (2) The formula: <FORM:0960746/C1/2> in which each R and R1 is as above, preferably alkyl; Z is a divalent radical selected from alkylidene and sulphur radicals, and n is an integer from 0 to 1; (3): <FORM:0960746/C1/3> in which each R and R1 is as above preferably being alkyl of up to 8 carbon atoms, and X is sulphur, oxygen or mononuclear arylene; (4): <FORM:0960746/C1/4> in which Ar is a hydrocarbon aryl nucleus, preferably mononuclear or having up to 3 fused rings; n is an integer from 0 to 1; R and R1 are preferably alkyl and m is an integer from 1 to 3. In examples the process applied to the crystallization of 2, 6-di-tertiary-butyl-4-hydroxy-methylphenol and bis(3, 5-ditertiary-butyl-4-hydroxy benzyl) ether is described. Specifications 889,321, 892,261 and 923,520 are referred to. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3457316-A |
| priorityDate | 1961-09-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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