Abstract: A process for producing propylene oxide, which comprises supplying an organic peroxide and propylene to an epoxidation reactor in which a solid catalyst is packed thereby continuously producing propylene oxide through epoxidation reaction, wherein said process comprises cooling at least a part of the propylene before supplying to separate and remove water contained in the propylene, and supplying the propylene in which water has been separated and removed to the epoxidation reactor.

Abstract: A method of purifying propylene oxide, which comprises subjecting the propylene oxide containing methyl formate as an impurity to extractive distillation using a hydrocarbon of 7 to 10 carbon atoms as an extractant with an extractive distillation column, adding water to the distillate from the overhead of the extractive distillation column to conduct oil-water separation, recycling the oil layer separated to the extractive distillation column, removing the aqueous layer outside the system thereby to obtain propylene oxide in which a methyl formate concentration is reduced as a bottom liquid of the extractive distillation column.

Abstract: A process for producing propylene oxide, which comprises supplying an organic peroxide and propylene to an epoxidation reactor in which a solid catalyst is packed thereby continuously producing propylene oxide through epoxidation reaction, wherein said process comprises cooling at least a part of the propylene before supplying to separate and remove water contained in the propylene, and supplying the propylene in which water has been separated and removed to the epoxidation reactor.

Abstract: A process for producing propylene oxide, which comprises the following steps: oxidation step: a step of obtaining cumene hydroperoxide by oxidizing cumene; epoxidation step: a step of obtaining propylene oxide and cumyl alcohol by reacting cumene hydroperoxide obtained in the oxidation step with propylene; and conversion step: a step of obtaining cumene by subjecting cumyl alcohol obtained in the epoxidation step to hydrogenation-containing reaction and recycling the cumene to the oxidation step, wherein a concentration of 1,2-epoxy-2-phenylpropane contained in the reaction mixture after the oxidation step, is 1% by weight or less.

Abstract: A method for continuously producing propylene oxide, which comprises supplying an organic peroxide and propylene to an epoxidation reactor in which a solid catalyst for epoxidation is packed, thereby subjecting them to an epoxidation reaction, the method having a propylene pre-treatment step described below: propylene pre-treatment step; a step of treating at least a part of propylene supplied to the epoxidation reactor, which comprises removing an oxygen-containing organic compound contained in propylene.

Abstract: A process for producing ?-methylstyrene from cumyl alcohol via dehydration in the presence of activated alumina, wherein a concentration of propylene oxide contained in a raw material containing cumyl alcohol is 10 to 1000 ppm by weight.

Abstract: A process for producing propylene oxide, which comprises the following steps below, and a step for removing alcohols of the carbon number of 2 to 3, cyclohexanol and/or isopropylcyclohexane outside of the reaction system in at least one place of the steps or between which the steps are connected: oxidation step: a step of obtaining cumene hydroperoxide by oxidizing cumene; epoxidation step: a step of obtaining propylene oxide and cumyl alcohol by reacting cumene hydroperoxide obtained in the oxidation step with propylene in an excess amount in a liquid in the presence of a solid catalyst; and hydrogenolysis step: a step of obtain cumene by subjecting cumyl alcohol obtained in the epoxidation step to hydrogenolysis, and recycling the cumene to the oxidation step as the raw material for the oxidation step.

Abstract: A process for producing propylene oxide, which comprises the following steps: oxidation step: a step of obtaining cumene hydroperoxide by oxidizing cumene; epoxidation step: a step of obtaining propylene oxide and cumyl alcohol by reacting cumene hydroperoxide obtained in the oxidation step with propylene; and converting step: a step of converting cumyl alcohol obtained in the epoxidation step into cumene in the presence of a solid catalyst and recycling said cumene to the oxidation step, wherein a concentration of methylbenzyl alcohol in a liquid containing cumene recycled to the oxidation step, is 1% by weight or less.

Abstract: A method of purifying propylene oxide, which comprises subjecting the propylene oxide containing methyl formate as an impurity to extractive distillation using a hydrocarbon of 7 to 10 carbon atoms as an extractant with an extractive distillation column, adding water to the distillate from the overhead of the extractive distillation column to conduct oil-water separation, recycling the oil layer separated to the extractive distillation column, removing the aqueous layer outside the system thereby to obtain propylene oxide in which a methyl formate concentration is reduced as a bottom liquid of the extractive distillation column.

Abstract: A process for producing cumene, which comprises supplying cumyl alcohol and hydrogen to a dehydration catalyst to obtain a mixture containing ?-methyl styrene and water produced and hydrogen, and supplying the mixture to a hydrogenation catalyst.

Abstract: A process for producing ?-methyl styrene from cumyl alcohol via dehydration in the presence of an activated alumina, characterized in that a concentration of an organic acid contained in a raw material containing cumyl alcohol is 10 to 1000 ppm by weight.

Abstract: A process for producing ?-methylstyrene from cumyl alcohol via dehydration in the presence of activated alumina, wherein a concentration of propylene oxide contained in a raw material containing cumyl alcohol is 10 to 1000 ppm by weight.

Abstract: A process for producing propylene oxide, which comprises the following steps: oxidation step: a step of obtaining cumene hydroperoxide by oxidizing cumene; epoxidation step: a step of obtaining propylene oxide and cumyl alcohol by reacting cumene hydroperoxide obtained in the oxidation step with propylene; and converting step: a step of converting cumyl alcohol obtained in the epoxidation step into cumene in the presence of a solid catalyst and recycling said cumene to the oxidation step, wherein a concentration of methylbenzyl alcohol in a liquid containing cumene recycled to the oxidation step, is 1% by weight or less.

Abstract: A process for producing propylene oxide, which comprises the following steps: oxidation step: a step of obtaining cumene hydroperoxide by oxidizing cumene; epoxidation step: a step of obtaining propylene oxide and cumyl alcohol by reacting cumene hydroperoxide obtained in the oxidation step with propylene in the presence of an epoxidation catalyst; and conversion step: a step of obtaining cumene by subjecting cumyl alcohol obtained in the epoxidation step to hydrogenation-containing reaction and recycling the cumene to the oxidation step, wherein a concentration of 1,2-epoxy-2-phenylpropane contained in the reaction mixture after the oxidation step, is 1% by weight or less.

Abstract: A process for producing cumene, which comprises supplying cumyl alcohol and hydrogen to a dehydration catalyst to obtain a mixture containing ?-methyl styrene and water produced and hydrogen, and supplying the mixture to a hydrogenation catalyst.

Abstract: A process for producing cumene, characterized by preparing a copper-based catalyst by reducing a copper-based catalyst precursor containing copper in an oxidized state with hydrogen in liquid cumene, and subjecting cumyl alcohol to hydrogenolysis in the presence of the copper-based catalyst, and a process for producing propylene oxide which includes that process.

Abstract: A process for regenerating a solid catalyst which has been used for producing propylene oxide through an epoxidation reaction of propylene with an organic peroxide in a reactor packed with the solid catalyst, which comprises allowing a liquid to flow through the catalyst packed in the reactor at a temperature not lower than the maximum reaction temperature of the epoxidation reaction. According to the present invention, a catalyst can be regenerated with extremely high efficiency without taking the catalyst to be regenerated out of the reactor.

Abstract: A process for recovering cumene, characterized by subjecting 2,3-dimethyl-2,3-diphenylbutane produced in a process in which cumene is used, to hydrogenolysis in the presence of a catalyst thereby to convert it into cumene, and recovering the cumene.

Abstract: A process for producing a titanium-containing silicon oxide catalyst satisfying the following conditions, which comprises the following steps: (1): an average pore diameter of 10 ? or more, (2): a pore diameter of 90% or more of the total pore volume of 5 to 200 ?, (3): a specific pore volume of 0.2 cm3/g or more, and (4): a quaternary ammonium ion represented by the following general formula (I) is used as the template and then the template is removed by solvent extraction, [NR1R2R3R4]+??(I) (wherein, R1 represents a linear or branched hydrocarbon group having 2 to 36 carbon atoms, and R2 to R4 represent an alkyl group having 1 to 6 carbon atoms); first step: a step for obtaining a solid containing a catalyst component and a template by mixing and stirring a silica source, a titanium source and a template in liquid phase, second step: a step of drying the solid obtained in the first step under a condition of a temperature of 120° C.

Abstract: A method for recovering propylene oxide, which comprises separating propylene oxide from a liquid mixture containing propylene oxide, cumene and cumyl alcohol through distillation using a distillation column, wherein the bottom temperature of the distillation column is 190° C. or lower.