摘要:
A hydrocarbon feedstock comprising naphthenes is catalytically reformed using a catalyst which promotes both dehydrogenation and isomerization. Cracking and other undesirable side reactions are substantially avoided by employing a reaction temperature in the range of 600* to 700*F and a hydrogen pressure not exceeding about 4 atmospheres. If the hydrogen partial pressure is about 1 atmosphere or less, satisfactory conversion of the naphthenes to aromatics is obtained without further steps. If the hydrogen partial pressure is between about 1 and about 4 atmospheres, the aromatics are adsorbed on a zeolite or other suitable substance as they are formed, thus shifting the equilibrium and promoting the dehydrogenation and isomerization reactions. The adsorbed aromatics are subsequently desorbed by, for example, heated hydrocarbon vapor. If the adsorption/desorption is used, a dual reactor set-up may be conveniently employed.
摘要:
A process for manufacturing high octane gasoline from a low octane paraffinic naphtha, which comprises hydrocracking a first portion of the naphtha to yield a C4 fraction comprising isobutane and a hydrocracked light naphtha fraction having a relatively high octane number, catalytically cracking a second portion of the naphtha to yield a C3-C4 fraction comprising propylene, butylenes and isobutane and a catalytically cracked light naphtha fraction having a relatively high octane number, and reacting, in an alkylation zone the hydrocracked C4 fraction and the catalytically cracked C3-C4 fraction to yield a high octane gasoline alkylate. The proportion of naphtha charged to the hydrocracking zone and the catalytic cracking zone are adjusted such that isobutane, butylene and propylene charge to the alkylation zone are in stoichiometric balance.
摘要:
A cyclic process is disclosed for sequentially treating two different naphtha stocks in the same molecular sieve adsorption bed to produce nonstraight chain hydrocarbon fractions respectively from each stock and a third product composed of straight chain hydrocarbons from both stocks. Also disclosed is the use of this procedure in conjunction with a reforming process wherein a naphtha feed is first denormalized, the denormalized naphtha is reformed and the resulting reformate is denormalized to yield high octane gasoline blending stock.
摘要:
A process for producing gasoline from a hexane-rich hydrocarbon feed which comprises disproportionating the hexane-rich feed to obtain at least C5 hydrocarbons and C7+ hydrocarbons, and catalytically reforming the C7+ hydrocarbons to obtain reformate. Preferably, the normal pentane hydrocarbons obtained from disproportionating the hexane are fed to a C5 isomerization process to obtain isopentane. Preferably, a common fractionation zone is used for the disproportionation, catalytic reforming and C5 isomerization processes.
摘要:
Motor fuel-blending components are produced by a combination of steps comprising naphtha reforming, hydrogenation of aromatics, e.g., benzene, separated from the reformate, and isomerization of cyclohexane to methylcyclopentane.
摘要:
ETHYLENE, ACETYLENE, AN AROMATIC STREAM, AND PETROLEUM COKE ARE PRODUCED BY DISTILLING A CRUDE OIL TO PRODUCE LIGHT PETROLEUM ENDS, A LIGHT NAPHTH, A HEAVY NAPHTHA, AND A LESS VOLATILE REDUCED CRUDE OIL; FEEDING THE LIGHT NAPHTHA STREAM TO A HYDROCARBON PUROLYSIS FURNACE; FEEDING THE HEAVY NAPHTHA STREAM COMBINED WITH A COKER NAPHTHA TO A REFORMER WHERE SULFUR IS REMOVED, THE OLEFINS ARE SATURATED, AND THE NAPHTHENES ARE AROMATIZED, FOLLOWING WHICH AROMATICS ARE EXTRACTED FROM THE REFORMED STREAM LEAVING A MIXTURE OF NORMAL AND ISOPARAFFINS WHICH THEN ENTER THE PYROLYSIS FURNACE. THE PYROLYSIS PRODUCTS ARE SENT TO A SEPARATION TRAIN FROM
WHICH ETHYLENE AND/OR ACETYLENE ARE WITHDRAWN. OILS AND TARS ARE REMOVED FROM THE SEPARATION TRAIN AND INTRODUCED INTO A COKER, WHICH ALSO RECEIVES REDUCED CRUDE AND GAS OIL FROM THE DISTILLATION UNIT AND WHICH PRODUCES COKE, FUEL OIL, FUEL GAS, AND A COKER NAPHTHA WHICH IS COMBINED WITH THE HEAVY NAPHTHA AND FED INTO THE REFORMER.