Abstract:
A baked hydrotalcite-like compound having Mg as divalent metal and a carbonate ion as anion, and alkali metal-carrying substance comprising the baked compound having carried thereon an alkali metal. When this substance is treated with a gas containing molecular oxygen, part of the alkali metal is converted into its oxide to give a more stable substance. These substances serve, for example, as catalyst for olefin isomerization.
Abstract:
The polycarbonate of the invention includes ones based on sucrose, oligosaccharides other than it, and monosaccharides each having a specified cyclic structure; ones derived from specified saccharides not containing any cyclic structure; ones having a skeleton of pentaerythritol, neopentyl glycol or trimethylolethane; and specified ones. The lubricant and electrical insulation oil of the invention contain the polycarbonate.
Abstract:
A method of purifying an aqueous solution of m-aminophenol containing m-phenylenediamine as impurity which comprises extracting the m-phenylenediamine from the aqueous solution with a halogenated hydrocarbon.
Abstract:
Disclosed is a method of purifying an aqueous solution of m-aminophenol containing m-phenylenediamine as impurities, by extracting m-phenylenediamine from the aqueous solution with a halogenated hydrocarbon. Also disclosed is an improvement in a process of producing m-aminophenol comprising: reacting resorcinol with ammonia in water in the presence of a water soluble amination catalyst at elevated temperatures in a reaction vessel, and then separating m-aminophenol from the resultant reaction mixture. The improved process employes the above-mentioned purification method and comprises: (a) a step of removing unreacted ammonia from the reaction mixture and then crystallizing crude m-aminophenol from the reaction mixture; (b) a step of separating the crude m-aminophenol from the reaction mixture; (c) a step of adding a halogenated hydrocarbon to the resulting mother liquor to extract m-phenylenediamine as byproducts into the halogenated hydrocarbon, separating an aqueous phase from an organic phase, and recycling the aqueous phase to the reaction vessel; and (d) a step of distilling the crude m-aminophenol to provide high purity m-aminophenol.
Abstract:
The polycarbonates of the present invention include those having a skeletal structure of pentaerythritol, neopentyl glycol or trimethylolmethane, and specific dicarbonates. The lubricating oil and electrical insulating oil of the invention contain the above-mentioned polycarbonates. The polycarbonates of the invention are excellent in compatibility with Freon R-134a (HFC) as well as in lubricating properties, detergency and electrical insulating properties, and are capable of providing lubricating oil for refrigerator, automotive engine oil, automotive gear oil, lubricating oil for rolling and lubricating oil for fiber, especially lubricating oil for which electrical insulating properties are required, and electrical insulating oil.
Abstract:
The polycarbonate of the invention is a polycarbonate derived from adducts such as propylene oxide adducts of polyglycerols. The lubricating oil of the invention comprises this polycarbonate, and if necessary, a specific polycarbonate having a -C2H4O- group and/or a -CH2CH(CH3)O-group in its main chain. The lubricating oil of the invention can be used as a lubricating oil for refrigerators such as automotive air-conditioner and electric refrigerator. In particular, the lubricating oil of the invention is suitable as a lubricating oil for refrigerator wherein high-viscosity lubricating oil is used, for example, lubricating oil for automotive rotary air-conditioner, and also suitable as lubricating oil for a refrigerator wherein ozone layer-nondestructive hydrogenated fluorocarbon such as R-134a is used as a refrigerant.
Abstract:
A method of purifying an aqueous solution of m-aminophenol containing m-phenylenediamine as impurity which comprises extracting the m-phenylenediamine from the aqueous solution with a halogenated hydrocarbon.
Abstract:
In the separation of at least two alkyl phenols having close boiling points by azeotropic distillation of a mixture composed of the alkyl phenols with a hydrocarbon azeotroping agent, the use, as hydrocarbon azeotroping agent, of saturated aliphatic hydrocarbons of 9 to 13 carbon atoms having a boiling point of 150 to 190 DEG C at 760 mmHg provides an improved separating efficiency.
Abstract:
The polycarbonate of the invention is a polycarbonate derived from adducts such as propylene oxide adducts of polyglycerols. The lubricating oil of the invention comprises this polycarbonate, and if necessary, a specific polycarbonate having a -C2H4O- group and/or a -CH2CH(CH3)O-group in its main chain. The lubricating oil of the invention can be used as a lubricating oil for refrigerators such as automotive air-conditioner and electric refrigerator. In particular, the lubricating oil of the invention is suitable as a lubricating oil for refrigerator wherein high-viscosity lubricating oil is used, for example, lubricating oil for automotive rotary air-conditioner, and also suitable as lubricating oil for a refrigerator wherein ozone layer-nondestructive hydrogenated fluorocarbon such as R-134a is used as a refrigerant.