Chemistry of hydrocarbon compounds – Aromatic compound synthesis – By ring formation from nonring moiety – e.g. – aromatization,...
Patent
1996-12-20
1999-03-02
Caldarola, Glenn
Chemistry of hydrocarbon compounds
Aromatic compound synthesis
By ring formation from nonring moiety, e.g., aromatization,...
585407, 585413, 585415, 585417, 585414, 208135, 208138, 208140, G07C 1500, G07C 200, G07C 252, C10G 3506
Patent
active
058773681
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for producing aromatic hydrocarbons from light hydrocarbons. More particularly, the present invention is concerned with a method for producing aromatic hydrocarbons from light hydrocarbons, which comprises supplying a light hydrocarbon feedstock comprising at least one member selected from the group consisting of olefins and paraffins to a fixed-bed, adiabatic reactor containing a fixed catalyst bed comprised of a zeolite catalyst, to thereby contact the light hydrocarbon feedstock with the zeolite catalyst in the fixed-bed, adiabatic reactor and effect a catalytic cyclization reaction of the light hydrocarbon feedstock, wherein the zeolite catalyst has a specific activity, and the catalytic cyclization reaction is conducted under specific temperature conditions with respect to the catalyst bed.
By the method of the present invention, not only can aromatic hydrocarbons be produced in high yield, but also a lowering of the catalytic activity is small, so that the production of aromatic hydrocarbons can be stably conducted for a prolonged period of time. The method of the present invention can be advantageously used in the petrochemical industry and in petroleum refining, especially in the production of aromatic compounds and high-octane gasolines.
2. Prior Art
Various methods are conventionally known in which aromatic hydrocarbons are produced using as a catalyst a zeolite, such as ZSM-5. For example, Examined Japanese Patent Application Publication No. 56-42639 (corresponding to U.S. Pat. No. 3,756,942) discloses a method in which aromatic hydrocarbons are produced from a hydrocarbon feedstock which is comprised of paraffins, olefins and/or naphthenes, each having 5 or more carbon atoms, and which has an aromatic hydrocarbon content of 15% by weight or less, using a ZSM-5 type zeolite catalyst. Examined Japanese Patent Application Publication No. 4-5712 discloses a method in which aromatic hydrocarbons are produced from a hydrocarbon feedstock containing saturated hydrocarbons having 4 or less carbon atoms, unsaturated hydrocarbons having 2 to 4 carbon atoms and a virgin naphtha in a specific amount ratio, using a ZSM-5 type zeolite catalyst.
Further, U.S. Pat. No. 3,845,150 discloses a process in which a hydrocarbon comprising 20 to 65% by weight of saturated hydrocarbons and 20 to 50% by weight of unsaturated hydrocarbons is contacted with a ZSM-5 type zeolite catalyst, so that the process involving the cyclization reaction (exothermic) of the unsaturated hydrocarbons and the cyclization reaction (endothermic) of the saturated hydrocarbons can be performed under heat balanced conditions, thereby producing aromatic hydrocarbons by an isothermal reaction.
Japanese Patent Application prior-to-examination Publication (kohyo) No. 3-503656 (corresponding to U.S. Pat. No. 4,851,602) discloses a method in which a hydrocarbon feedstock containing lower alkanes and lower alkenes is contacted with a fluidized bed of an acid type zeolite catalyst having medium pores in a first conversion zone, thereby obtaining a reaction mixture (effluent stream) containing aromatic hydrocarbon-rich higher aliphatic hydrocarbons, and the obtained reaction mixture is contacted with a fluidized bed of an acid type zeolite catalyst having medium pores in a second conversion zone, thereby obtaining a product which is rich in alkylated aromatic hydrocarbons and which contains gasolines having 5 or more carbon atoms.
Further, Unexamined Japanese Patent Application Laid-Open Specification No. 63-69888 (corresponding-to U.S. Pat. No. 4,720,602) discloses a method in which a hydrocarbon feedstock containing at least 50% by weight of C.sub.2 -C.sub.12 aliphatic hydrocarbons is converted to aromatic compounds, using a crystalline zeolite catalyst having a specific activity.
Unexamined Japanese Patent Application Laid-Open Specification No. 63-14732 discloses a method in which aromatic hydrocarbons are produced from light hydrocarbons, using a ZSM-
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Kawase Masatsugu
Kiyama Kazuyoshi
Tsunoda Takashi
Caldarola Glenn
Dang Thuan D.
Sanyo Petrochemical Co., Ltd.
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