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A process for hydrogenating refining process of in addition to aromatics, non-aromatic components and sulfur compounds can be easily oils containing coke oven
A process for hydrogenating refining process of in addition to aromatics, non-aromatic components and sulfur compounds can be easily oils containing coke oven
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机译:除芳烃,非芳族成分和硫化合物外的加氢精制工艺可以很容易地将含油的焦炉油
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摘要
A process for purifying coke oven light oil contaminated with non-aromatic hydrocarbons and sulphur compounds comprises preheating the oil to at least 565 DEG C., introducing it into contact with a chromia on alumina dehydrogenation catalyst prepared by impregnating porous activated alumina having a surface area of 100-200 sq. m/gm. with 5-40% wt. of the final catalyst of chromium oxide and thereafter adjusting the surface area to a significantly lower surface area of at least 50 sq. m/gm., effecting said contact in the range 599-632 DEG C. in the presence of added compatible gas (i.e. hydrogen with or without normally gaseous hydrocarbons and/or gases inert under the reaction conditions, e.g. nitrogen) in an amount of 3.1-6.3 mols. of compatible gas per mol. of oil, said gas containing sufficient free hydrogen initially to give a partial pressure of at least 50% of the total pressure of said contact in which said total pressure is 28-70 kg/cm.2 gauge, introducing said light oil at a space rate of 0.1-1.4 vols. oil (as liquid)/vol. catalyst/hour, recovering and separating the effluent into products including a product substantially free of non-aromatic hydrocarbons and sulphur compounds. The light oil may first be vaporized in the presence of hydrogen containing gas at 121-315 DEG C. at a total pressure of 31.5-65 kg/cm.2 gauge, the vaporized charge further heated and introduced to the dehydrogenation reaction at 593-599 DEG C. Desirably, the effluent from the dehydrogenation is passed, with reduction of temperature and pressure, to a separation zone, where it is separated into a first fraction, containing substantially all products boiling below benzene, which is in turn passed to separation and purification zones, at least one gas stream comprising hydrogen being recovered, and a second fraction, containing products boiling in the range of benzene and higher, which fraction is subjected to a clay treatment to remove residual non-aromatic hydrocarbons and is then fractionally distilled to recover at least one fraction consisting of substantially pure aromatics. Preferably the liquid hourly space velocity provides a reaction time according to the formula 0 = 3600 MW.P/L.P.(1+G).T.R. Where #q is the reaction time in seconds and lies in the range 60-180 seconds; MW is the average molecular weight of the liquid oil charge; P is the total absolute pressure; L is the liquid hourly space velocity of the oil charge; P is the density of the liquid oil charge; G is the gas to oil mol. ratio; T is the absolute temperature; and R is the gas constant. Preferably the reaction is effected at an average bed temperature within 5.5 DEG C. of and no higher than the outlet temperature.ALSO:A dehydrogenation catalyst for the purification of coke oven light oils (see Division C5) is prepared by impregnating porous active alumina having a surface area of 100-200 m.2/g. with 5-40% weight based on the final catalyst, of chromium oxide, and thereafter adjusting the surface area to a significantly lower surface area of at least 50 m.2/g., for example by heat treatment. Desirably a sterilizing agent such as 0,5-3,5% weight of swelling bentonite and/or an alkali metal content in amount of 0,15-0,5% weight, calculated as the oxide, may be incorporated with the alumina prior to compositing with the chromia. The starting alumina may be a gamma alumina or an alumina obtained from beta alumina trihydrate. In an example a mixture of alumina trihydrate containing 0,35% Na2O, sodium bentonite, nitric acid and water was aged, extruded, and cut into pellets which were dried and heat treated in air, impregnated with a solution of CrO3, drained, dried, and calcined to obtain the catalyst.
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