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Method of Making Cyclohexanol and Cyclohexanone by Oxidation of Cyclohexane
| Content Provider | Semantic Scholar |
|---|---|
| Author | DiWiew, AdE I. M. O. H. A. C. Hardung-Harding, Heimo |
| Copyright Year | 2017 |
| Abstract | OF THE DISCLOSEJRE Process for the oxidation of cyclohexane to cyclohex anol and cyclohexanone wherein the oxidation reaction takes place in liquid phase in the presence of ionizing rays below about 170° C. and at elevated pressure. Improved yields of 86-88% in a conversion range of 5 to 9% are obtained. BACKGROUND OF THE INVENTION This invention relates to a process for the production of cyclohexanol and cyclohexanone by oxidation of cyclo hexane in liquid or gaseous phase with oxygen or Oxygen containing gases, which may be carried out in the presence of oxidation catalysts. t is a known practice to obtain cyclohexanol and Cy clohexanone by way of the oxidation of cyclohexane. The recovery is carried out as a rule under pressure at reaction temperatures between 170° and 220 C. with the use of catalysts. Besides cyclohexanol and cyclohexanone there arises in the process a considerable amount of by-products. Moreover, there exists a relation between the degree of conversion of cyclohexane and the yield in cyclohexanol and cyclohexanone. A lower conversion of cyclohexane results in a higher yield of cyclohexanol and cyclohexa none and vice versa. The conversion of cyclohexane, ac cordingly, is to be kept as low as possible if there is to be achieved a good yield of cyclohexanol and cyclohexa none. Excessively low degrees of conversion, for example below 4%, however, render the process uneconomical through the large amount of cyclohexane to be circulated. The optimum lies at present at a degree of conversion of 5% to 9% with a yield of about 65% to 78% of cyclo hexanol and cyclohexanone. What is disturbing in the known process is, above all, the secondary attack of the oxygen on the cyclohexanol already formed. For the economy of the cyclohexanol and cyclohexanone production, therefore, it is important to re duce to a minimum the constituent of the sequence and side reactions--especially by the oxygen. This is accom plished mainly by maintaining a brief residence time of the cyclohexane at the continuously operating oxidation re actor and by maintenance of a relatively low degree of conversion by corresponding dosing of the oxygen. The oxidized products are to be removed as rapidly as possible from the hot reaction zone and to be withdrawn from the further attack of the oxygen. High degrees of conver sion, just like the long staying times, bring about an in creasing amount of by-products to the disfavor of the cyclohexanol and cyclohexanone yield. However, the main tenance of a short staying time is technically achievable only with great difficulty. Furthermore, at low degrees of conversion, as already indicated above, the economy of the process is jeopardized. It is, accordingly, an object of the present invention to provide a novel process for the production of cyclo O |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://patentimages.storage.googleapis.com/72/99/32/05bccbc5f8cc4a/US3706647.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
