http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1295534-A
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C2601-14 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C29-52 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C29-52 |
| filingDate | 1970-03-19^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1972-11-08^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1295534-A |
| abstract | 1295534 Cleaning hydrocarbon oxidation plants HALCON INTERNATIONAL Inc 19 March 1970 [20 March 1969] 13360/70 Heading C7E [Also in Division C2] The interior of a plant which has been used for the oxidation of saturated hydrocarbons in the presence of boron compounds is cleaned by treatment with an alcohol at elevated temperature in the absence of oxygen. The cleaning is preferably at elevated pressure, e.g. 1-6 atm. gauge and 100 to 200‹C, an inert gas such as N 2 being passed through the plant; the alcohol may be ethanol, a propanol, butanol, pentanol, hexanol, octanol, methyl cyclohexanol, or cyclohexanediol, or cyclohexanol, cyclooctanol, cyclododecanol or ethylene glycol, but is preferably the alcohol produced in the plant by oxidation of a hydrocarbon, possibly in solution in said hydrocarbon. In the plant shown, the oxidation of hydrocarbons, e. g. cyclohexane, proceeds as follows: cyclohexane (A) pre-heated in exchangers 2, 3, is fed to oxidation reactor 8, whilst a side stream plus additional cyclohexane (B) is fed via pre-heater 6 and vaporizer 7 to 8. Cyclohexane/orthoboric acid slurry (C) is dehydrated at 1 and thus cyclohexane/metaboric acid passes to 8 together with oxidation air (D) from compressor 15 and cyclohexane is oxidized in 8 at 160‹-180‹C., boric acid cyclohexyl ester being produced. Liquid from 8 passes via 9 to flash column 10 where unconverted cyclohexane is distilled off, (K), the bottoms going to hydrolyser 11 where the boric acid ester is hydrolysed by boric acid mother liquor from centrifuge 14, plus water. 12 is a phase separator where aqueous phase (to 13) and organic product (M) are separated. 1, 8, 9 and 10 are prone to scaling by boron compounds, and cleaning is as follows: suspended and dissolved B compounds are flushed out with cyclohexane after cutting off the supply of air (D) and boric acid (C), pressure in the apparatus being supplied by N 2 . Boric acid scale and resinous deposits still remain in the apparatus, and are removed thus: product from 12 is recycled to A, B, and C, and distillate from column 10 is returned as reflux, whilst oxidation product (92% cyclohexanol, 8% cyclohexanone) is added to the said product from 12 to give therein a cyclohexanol concentration of 10-11% and this solution reacts with boric acid scale giving an ester and liberating water which collects in separator 5, the cessation of formation of water indicating complete scale removal. |
| priorityDate | 1969-03-20^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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