Abstract: A sliding spline shaft device of the present invention includes a male spline and a female spline that is fitted to the male spline in an axially slidable manner, and at least one of the splines has a surface processed layer. The surface processed layer includes an undercoat layer, an intermediate layer containing phosphate, and a topcoat layer containing solid lubricant, in this order. The undercoat layer contains iron nitride and/or iron carbide. Thus, the surface of a base material has high hardness. As a result, microscopic deformation of the sliding surface is reduced, and increase in a real contact area is suppressed, whereby stick-slip is prevented.

Abstract: Provided is a production method for indan and hydrindane, including a reaction step of introducing a raw material composition including tetrahydroindene into a continuous reactor including a solid catalyst containing platinum, and bringing the raw material composition into contact with the solid catalyst under the conditions of 150° C. to 350° C. to obtain a reaction product including indan and hydrindane, in which the amount (mol/min) of hydrogen molecules is 5 times or less the amount (mol/min) of tetrahydroindene, and the amount (mol/min) of oxygen molecules is 0.1 times or less the amount (mol/min) of tetrahydroindene.

Abstract: To provide a method for producing cyclohexylbenzene, which is capable of obtaining cyclohexylbenzene at a high selectivity, and a cyclohexylbenzene composition obtained with the method. A method for producing cyclohexylbenzene, comprising a step of bringing a raw material containing benzene and cyclohexene or cyclohexanol into contact with a solid acid catalyst to thereby perform alkylation reaction, wherein the solid acid catalyst is a silica-alumina catalyst or an MTW-type zeolite catalyst.

Abstract: A method for producing xylene, including a conversion reaction step of bringing a raw material containing a light hydrocarbon having 2 to 7 carbon atoms as a main component into contact with a crystalline aluminosilicate-containing catalyst to produce a product containing a monocyclic aromatic hydrocarbon having 6 to 8 carbon atoms and a xylene conversion step of subjecting the product to a disproportionation reaction or a transalkylation reaction.

Abstract: A method for producing a monocyclic aromatic hydrocarbon having 6 to 8 carbon atoms, including bringing a raw material which contains a light hydrocarbon having 2 to 7 carbon atoms as a main component into contact with a catalyst composition for producing a monocyclic aromatic hydrocarbon having 6 to 8 carbon atoms. The catalyst composition for producing a monocyclic aromatic hydrocarbon having 6 to 8 carbon atoms is coated with an amorphous silicon oxide compound and contains a crystalline aluminosilicate, and the silicon oxide compound is a silicon oxide compound derived from a compound represented by XnSi(OR)4-n, where X represents a hydrogen atom or an alkyl group, R represents an alkyl group, and n represents an integer of 0 to 4.

Abstract: The present invention provides an indene composition having a content of indene of 80 to 99.5% by mass, in which a content ratio of a hydrocarbon compound having a condensed ring structure of a 5-membered ring and a 6-membered ring, and having 9 or 10 carbon atoms, in a component contained in addition to indene, is 90% by mass or more, and a content of benzonitrile is 0.5% by mass or less, and a content of sulfur is 5 ppm by mass or less.

Abstract: The present invention provides an indene composition having a content of indene of 80 to 99.5% by mass, in which a content ratio of a hydrocarbon compound having a condensed ring structure of a 5-membered ring and a 6-membered ring, and having 9 or 10 carbon atoms, in a component contained in addition to indene, is 90% by mass or more, and a content of benzonitrile is 0.5% by mass or less, and a content of sulfur is 5 ppm by mass or less.

Abstract: A method for producing xylene, including a conversion reaction step of bringing a raw material containing a light hydrocarbon having 2 to 7 carbon atoms as a main component into contact with a crystalline aluminosilicate-containing catalyst to produce a product containing a monocyclic aromatic hydrocarbon having 6 to 8 carbon atoms and a xylene conversion step of subjecting the product to a disproportionation reaction or a transalkylation reaction.

Abstract: A method for producing a monocyclic aromatic hydrocarbon having 6 to 8 carbon atoms, including bringing a raw material which contains a light hydrocarbon having 2 to 7 carbon atoms as a main component into contact with a catalyst composition for producing a monocyclic aromatic hydrocarbon having 6 to 8 carbon atoms. The catalyst composition for producing a monocyclic aromatic hydrocarbon having 6 to 8 carbon atoms is coated with an amorphous silicon oxide compound and contains a crystalline aluminosilicate, and the silicon oxide compound is a silicon oxide compound derived from a compound represented by XnSi(OR)4-n, where X represents a hydrogen atom or an alkyl group, R represents an alkyl group, and n represents an integer of 0 to 4.

Abstract: A method of producing a lower olefin and BTX from stock oils selected from at least two kinds of oils is provided. The method includes a first catalytic cracking step of bringing one stock oil A into contact with a catalytic cracking catalyst; a second catalytic cracking step of bringing one stock oil B, having an aromatic component content smaller than that of the stock oil A, into contact with the catalytic cracking catalyst; and a separation and collection step of collecting the lower olefins and BTX from a product generated in the first and second catalytic cracking steps. A contact time A during which the stock oil A is in contact with the catalytic cracking catalyst in the first catalytic cracking step is longer than a contact time B during which the stock oil B is in contact with the catalytic cracking catalyst in the second catalytic cracking step.

Abstract: A method of producing a lower olefin and BTX from stock oils selected from at least two kinds of oils is provided. The method includes a first catalytic cracking step of bringing one stock oil A into contact with a catalytic cracking catalyst; a second catalytic cracking step of bringing one stock oil B, having an aromatic component content smaller than that of the stock oil A, into contact with the catalytic cracking catalyst; and a separation and collection step of collecting the lower olefins and BTX from a product generated in the first and second catalytic cracking steps. A contact time A during which the stock oil A is in contact with the catalytic cracking catalyst in the first catalytic cracking step is longer than a contact time B during which the stock oil B is in contact with the catalytic cracking catalyst in the second catalytic cracking step.

Abstract: A method is provided for producing an aluminosilicate catalyst. The method includes a first phosphorus treatment step of treating a crystalline aluminosilicate with a first phosphorus compound, a mixing and firing step of mixing the phosphorus-treated crystalline aluminosilicate obtained in the first phosphorus treatment step with a binder and then performing firing to form an aluminosilicate mixture, and a second phosphorus treatment step of treating the aluminosilicate mixture with a second phosphorus compound.

Abstract: A method is provided for producing an aluminosilicate catalyst. The method includes a first phosphorus treatment step of treating a crystalline aluminosilicate with a first phosphorus compound, a mixing and firing step of mixing the phosphorus-treated crystalline aluminosilicate obtained in the first phosphorus treatment step with a binder and then performing firing to form an aluminosilicate mixture, and a second phosphorus treatment step of treating the aluminosilicate mixture with a second phosphorus compound.

Abstract: The method for producing a monocyclic aromatic hydrocarbon includes a cracking and reforming reaction step in which a catalyst for producing a monocyclic aromatic hydrocarbon containing crystalline aluminosilicate which has been subjected to a heat treatment in an atmosphere containing water vapor in advance is loaded into a fixed-bed reactor, and a feedstock oil having a 10 volume % distillate temperature of 140° C. or higher and a 90 volume % distillate temperature of 390° C. or lower is brought into contact with the catalyst to cause a reaction, so as to obtain a product containing a monocyclic aromatic hydrocarbon having 6 to 8 carbon atoms.

Abstract: A method for producing xylene from feedstock oil includes a cracking/reforming reaction step of bringing the feedstock oil into contact with a catalyst to produce monocyclic aromatic hydrocarbons; a separation/recovery step of separating and recovering, from a product obtained by the cracking/reforming reaction step, a fraction A containing monocyclic aromatic hydrocarbons having a 10 vol % distillation temperature of 75° C. or higher and a 90 vol % distillation temperature of 140° C. or lower, a xylene fraction containing xylene, and a fraction B containing monocyclic aromatic hydrocarbons having a 10 vol % distillation temperature of 145° C. or higher and a 90 vol % distillation temperature of 215° C. or lower; and a xylene conversion step of bringing a mixed fraction obtained by mixing the fractions A and B with each other into contact with a catalyst containing a solid acid to convert the mixed fraction into xylene.

Abstract: Method for producing monocyclic aromatic hydrocarbons includes a cracking and reforming reaction step of obtaining products containing monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms and a heavy fraction having 9 or more carbon atoms by bringing the feedstock oil into contact with a catalyst for producing monocyclic aromatic hydrocarbons containing crystalline aluminosilicate to cause a reaction, a catalyst separation step of separating and removing the catalyst for producing monocyclic aromatic hydrocarbons together with tricyclic aromatic hydrocarbons contained in the products from a mixture of the products and a small amount of the catalyst for producing monocyclic aromatic hydrocarbons carried by the products, both of which are derived in the cracking and reforming reaction step, and a purification and recovery step of purifying and recovering the monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms which are separated from the products formed in the cracking and reforming reaction step

Abstract: The catalyst for producing aromatic hydrocarbon is for producing monocyclic aromatic hydrocarbon having 6 to 8 carbon number from oil feedstock having a 10 volume % distillation temperature of 140° C. or higher and a 90 volume % distillation temperature of 380° C. or lower and contains crystalline aluminosilicate and phosphorus. A molar ratio (P/Al ratio) between phosphorus contained in the crystalline aluminosilicate and aluminum of the crystalline aluminosilicate is from 0.1 to 1.0. The production method of monocyclic aromatic hydrocarbon is a method of bringing oil feedstock having a 10 volume % distillation temperature of 140° C. or higher and a 90 volume % distillation temperature of 380° C. or lower into contact with the catalyst for producing monocyclic aromatic hydrocarbon.

Abstract: A method of producing monocyclic aromatic hydrocarbons includes bringing a light feedstock oil having a 10 vol % distillation temperature of 140° C. to 205° C. and a 90 vol % distillation temperature of 300° C. or lower, which has been prepared from a feedstock oil having a 10 vol % distillation temperature of 140° C. or higher and a 90 vol % distillation temperature of 380° C. or lower, into contact with a catalyst for monocyclic aromatic hydrocarbon production containing a crystalline aluminosilicate, in which a content ratio of monocyclic naphthenobenzenes in the light feedstock oil is adjusted by distillation of the feedstock oil such that the content ratio of monocyclic naphthenobenzenes in the light feedstock oil is higher than a content ratio of monocyclic naphthenobenzenes in the feedstock oil.

Abstract: A method is provided for producing an aluminosilicate catalyst. The method includes a first phosphorus treatment step of treating a crystalline aluminosilicate with a first phosphorus compound, a mixing and firing step of mixing the phosphorus-treated crystalline aluminosilicate obtained in the first phosphorus treatment step with a binder and then performing firing to form an aluminosilicate mixture, and a second phosphorus treatment step of treating the aluminosilicate mixture with a second phosphorus compound.

Abstract: A method of producing monocyclic aromatic hydrocarbons includes bringing a feedstock oil having a 10 vol % distillation temperature of 140° C. or higher and a 90 vol % distillation temperature of 380° C. or lower, into contact with a catalyst for monocyclic aromatic hydrocarbon production containing a crystalline aluminosilicate, in which a content ratio of monocyclic naphthenobenzenes in the feedstock oil is adjusted to 10 mass % to 90 mass %, by mixing a hydrocarbon oil A having a 10 vol % distillation temperature of 140° C. or higher and a 90 vol % distillation temperature of 380° C. or lower with a hydrocarbon oil B containing more monocyclic naphthenobenzenes than the hydrocarbon oil A.