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Method of separation of hydrocarbon chain line in the raw materials containing these hydrocarbons mixed with the hydrocarbon chain, branched and cyclic
Method of separation of hydrocarbon chain line in the raw materials containing these hydrocarbons mixed with the hydrocarbon chain, branched and cyclic
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机译:分离含有这些烃的原料中的烃链线与烃链,支链和环状混合的方法
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摘要
In a process for separating straight-chain hydrocarbons from petroleum fractions boiling between 85 DEG and 400 DEG C., particularly gas-oils boiling between 200 DEG and 400 DEG C., using a 5rA molecular sieve, the sulphur content of the feed-stock is first reduced to between 0.002 and 0.015% by weight. The desulphurization may be carried out by catalytic hydrogenation, the catalyst being chosen from Group VIa and Group VIII metals and their compounds, preferably supported on a refractory oxide, and employing temperatures between 300 DEG and 480 DEG C., pressure between 50-2000 p.s.i.g. space velocities of 0.5 to 20 v./v./hr., and a hydrogen rate of 50-10,000 S.C.F./B. The molecular sieve separation, which may be isothermal and/or isobaric, may comprise an absorbtion stage lasting for 10 seconds to 20 minutes and with a space velocity of 0.1 to 3.0 v./v./hr., a purge stage using nitrogen as a preferred purging agent, also lasting between 10 seconds and 20 minutes, with a space velocity of 50-400 G.H.S.V., and a desorption stage, using straight-chain paraffins, e.g. n-butane or n-pentane, as desorbing agents with a space velocity of 0.1-4.0 v./v./hr. and lasting for 5 to 20 minutes. All three stages are carried out between 200 DEG and 600 DEG C. and 0 and 500 p.s.i.g.ALSO:In a process, preferably carried out in the vapour phase, for separating straight-chain hydrocarbons from mixtures containing also branched-chain and/or cyclic hydrocarbons using a 5 molecular sieve, the sulphur content of the feedstock is first reduced to between 0,002 and 0,015% by weight. The desulphurization may be carried out by catalytic hydrogenation, the catalyst being selected from Group VIa and Group VIII metals and their compounds, preferably supported on a refractory oxide. Reaction conditions and preferred catalyst composition are described. The molecular sieve separation, which may be isothermal and/or isobasic, may comprise an absorption stage, a purge stage using nitrogen as a preferred purging agent, and a desorption stage using straight-chain paraffin, e.g. n-butane and n-pentane, as preferred desorbing agents. All three stages are carried out at 200-600 DEG C. and at a pressure of 0-500 p.s.i.g. Suitable feed stocks are petroleum fractions boiling within the range 85-400 DEG C., especially gas oils, boiling between 200 and 400 DEG C.
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