Abstract: The mixed composition for a refrigerator of the present invention contains: a refrigerant containing at least one unsaturated fluorinated hydrocarbon compound selected from compounds represented by the following molecular formula (1): CpFrHs??(1) wherein p represents an integer of from 2 to 6; r represents an integer of from 1 to 11; and s represents an integer of from 1 to 11, provided that the compound has one or more carbon-carbon unsaturated bond in a molecule, and a refrigerator lubricating oil containing, as a major component, a polyol ester (A) of a fatty acid (a1) that is a fatty acid having a number of carbon atoms of from 9 to 16 and has a content of a fatty acid having a number of carbon atoms of 9 of 50% by mol or more based on the total amount of the fatty acid (a1), and a polyol (a2) that is pentaerythritol and/or dipentaerythritol.

Abstract: A lubricating oil composition prepared by blending a base oil (A) containing a compound (A1) that is an ester or ether and has two or more aromatic rings, with a polyalkylene glycol (B) is provided. The lubricating oil composition has a high density (i.e., a high bulk modulus), a high viscosity index, and excellent shear stability.

Abstract: The present invention relates to a polyether compound having a halogen atom content of 0.1000% by mass or less in terms of a polymer molecule thereof as measured by combustion ion chromatography and a weight average molecular weight (Mw) of 140,000 or more and 1,000,000 or less.

Abstract: The refrigerator oil of the present invention is a refrigerator oil for a refrigerant including difluoromethane (R32), which contains a polyvinyl ether-based compound (A) including a constitutional unit (a1) having a methoxyethyl group in a side chain thereof.

Abstract: In the method for producing a polyether compound of the present invention, an oxirane monomer is polymerized with a trialkylaluminum and a non-halogen-containing onium salt to produce a polyether compound.

Abstract: The refrigerator oil of the present invention contains an oxygen-containing base oil and a viscosity index improver, and has a viscosity index (VI) of 200 or more and a volume resistivity of 1×109 ?m or more.

Abstract: The mixed composition for a refrigerator of the present invention contains: a refrigerant containing at least one unsaturated fluorinated hydrocarbon compound selected from compounds represented by the following molecular formula (1): CpFrHs??(1) wherein p represents an integer of from 2 to 6; r represents an integer of from 1 to 11; and a represents an integer of from 1 to 11, provided that the compound has one or more carbon-carbon unsaturated bond in a molecule, and a refrigerator lubricating oil containing, as a major component, a polyol ester (A) of a fatty acid (a1) that is a fatty acid having a number of carbon atoms of from 9 to 16 and has a content of a fatty acid having a number of carbon atoms of 9 of 50% by mol or more based on the total amount of the fatty acid (a1), and a polyol (a2) that is pentaerythritol and/or dipentaerythritol.

Abstract: The method for producing a polyalkylene glycol of the present invention is a method for producing a polyalkylene glycol, including performing a polymerization reaction of an alkylene oxide with a composite metal catalyst, the polymerization reaction being performed in the presence of an organic solvent in an amount of 10 to 90 mass % based on the polyalkylene glycol to be produced.

Abstract: A lubricating oil composition prepared by blending a base oil (A) containing a compound (A1) that is an ester or ether and has two or more aromatic rings, with a polyalkylene glycol (B) is provided. The lubricating oil composition has a high density (i.e., a high bulk modulus), a high viscosity index, and excellent shear stability.

Abstract: The present invention is a lubricating oil for compression-type refrigerators using a difluoromethane (R32) refrigerant. The lubricating oil for compression-type refrigerators contains a first polyvinyl ether compound that is a polymer having a structural unit of a specific structure and has a carbon/oxygen molar ratio of from 3.0 to less than 4.0.

Abstract: A lubricating oil composition for refrigerating machines contains a base oil and an additive in a form of a hydrocarbon compound having a biphenyl structure or a stilbene structure. When the present lubricating oil composition for refrigerating machines is used in refrigerating equipment such as an open-type automobile air-conditioner, an electric automobile air-conditioner, a gas heat pump, other air-conditioning equipment, a refrigerating machine, a vending machine, a showcase, a water-heating system and a refrigerating/heating system, it is possible to detect the leakage of a refrigerant with a long-lasting stability. Therefore, when an unsaturated chlorofluorocarbon refrigerant with a poor stability is used in the above-listed equipment, the present lubricating oil composition for refrigerating machines is significantly advantageous.

Abstract: The present invention is a lubricating oil for compression-type refrigerators using a difluoromethane (R32) refrigerant. The lubricating oil for compression-type refrigerators contains a first polyvinyl ether compound that is a polymer having a structural unit of a specific structure and has a carbon/oxygen molar ratio of from 3.0 to less than 4.0.

Abstract: A lubricating oil composition for refrigerating machines contains a base oil and an additive in a form of a coumarin compound. When the present lubricating oil composition for refrigerating machines is used in refrigerating equipment such as an open-type automobile air-conditioner, an electric automobile air-conditioner, a gas heat pump, other air-conditioning equipment, a refrigerating machine, a vending machine, a showcase, a water-heating system and a refrigerating/heating system, it is possible to detect the leakage of a refrigerant with a long-lasting stability. Therefore, when an unsaturated chlorofluorocarbon refrigerant with a poor stability is used in the above-listed equipment, the present lubricating oil composition for refrigerating machines is significantly advantageous.

Abstract: The present invention is a lubricating oil for compression-type refrigerators using a difluoromethane (R32) refrigerant. The lubricating oil for compression-type refrigerators contains a first polyvinyl ether compound that is a polymer having a structural unit of a specific structure and has a carbon/oxygen molar ratio of from 3.0 to less than 4.0.

Abstract: A lubricating oil composition for refrigerating machines contains a base oil and an additive in a form of a hydrocarbon compound having a biphenyl structure or a stilbene structure. When the present lubricating oil composition for refrigerating machines is used in refrigerating equipment such as an open-type automobile air-conditioner, an electric automobile air-conditioner, a gas heat pump, other air-conditioning equipment, a refrigerating machine, a vending machine, a showcase, a water-heating system and a refrigerating/heating system, it is possible to detect the leakage of a refrigerant with a long-lasting stability. Therefore, when an unsaturated chlorofluorocarbon refrigerant with a poor stability is used in the above-listed equipment, the present lubricating oil composition for refrigerating machines is significantly advantageous.

Abstract: A lubricating oil composition for refrigerating machines contains a base oil and an additive in a form of a coumarin compound. When the present lubricating oil composition for refrigerating machines is used in refrigerating equipment such as an open-type automobile air-conditioner, an electric automobile air-conditioner, a gas heat pump, other air-conditioning equipment, a refrigerating machine, a vending machine, a showcase, a water-heating system and a refrigerating/heating system, it is possible to detect the leakage of a refrigerant with a long-lasting stability. Therefore, when an unsaturated chlorofluorocarbon refrigerant with a poor stability is used in the above-listed equipment, the present lubricating oil composition for refrigerating machines is significantly advantageous.

Abstract: The invention provides an optimum method for utilizing a desulfurizing agent for liquid hydrocarbons which can efficiently remove sulfur content from kerosene without performing addition of hydrogen to a low sulfur concentration and which has a prolonged lifetime. The invention provides a desulfurization method which includes removing sulfur content from kerosene by use of a metallic desulfurizing agent without performing addition of hydrogen, characterized in that the method employs desulfurization conditions satisfying the following formula (1): 1.06×Pope0.44<Tope/T50<1.78×Pope0.22??(1) (wherein Tope is operation temperature (° C.); Pope is operation pressure (MPa); and T50 is a temperature per 50 percent recovered as determined by “test method for distillation at atmospheric pressure” stipulated in JIS K2254 “Petroleum products—Determination of distillation characteristics as revised in 1998”).

Abstract: The invention provides an optimum method for utilizing a desulfurizing agent for liquid hydrocarbons which can efficiently remove sulfur content from kerosene without performing addition of hydrogen to a low sulfur concentration and which has a prolonged lifetime. The invention provides a desulfurization method which includes removing sulfur content from kerosene by use of a metallic desulfurizing agent without performing addition of hydrogen, characterized in that the method employs desulfurization conditions satisfying the following formula (1): 1.06×Pope0.44<Tope/T50<1.78×Pope0.22??(1) (wherein Tope is operation temperature (° C.); Pope is operation pressure (MPa); and T50 is a temperature per 50 percent recovered as determined by “test method for distillation at atmospheric pressure” stipulated in JIS K2254 “Petroleum products—Determination of distillation characteristics”).

Abstract: A method of manufacturing a catalyst for purifying exhaust gas, the catalyst including a pentasil-type crystalline aluminosilicate catalyst carrier carrying thereon a copper component and a phosphorus component. The method is characterized by adding the catalyst carrier into a solution containing a copper component and a phosphorus component, or a buffer and having a predetermined pH adjusted with ammonia, and subsequently adding an acid to the solution so as to adjust the pH of the solution to 7.0 or less, to thereby incorporate the copper component and the phosphorus component into the catalyst carrier. According to the present invention, a catalyst for removing exhaust gases which is durable and which has a high NO.sub.X removal factor can be prepared in a stable manner.