Abstract:
A method for producing epsilon -caprolactam by reacting cyclohexanone with a nitrogen source and oxygen wherein epsilon -caprolactam is produced from cyclohexanone in a single stage at a high selectivity by effecting the reaction in the presence of an oxide catalyst containing one or more metals M(s) selected from metals belonging to the groups 3 to 12 in the periodic table.
Abstract:
A method of continuously manufacturing lactam under high temperature and high pressure fluid, characterized by comprising the step of leading ketone and a hydroxylamine compound in a reaction field under high temperature and high pressure conditions of circulating fluid to efficiently synthesize lactam in a short time, whereby lactam can be rapidly synthesized continuously from ketone under the high temperature and high pressure fluid conditions of 175 C or higher in temperature range and 7 MPa or higher in pressure range.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing laurolactam in a high purity from cyclododecanone in a high efficiency. SOLUTION: This method for producing laurolactam by performing the reaction of starting cyclododecanone raw material with a mineral salt of hydroxylamine and converting the obtained cyclododecanone oxime by Beckmann rearrangement reaction is provided by controlling by ≤1,000 ppm each of the contents of oxygen atom-containing 12C hydrocarbon compounds, e.g. cyclododecenone or epoxycyclododecane and cycloaliphatic unsaturated 12C hydrocarbons contained in the cyclododecanone raw material as impurities. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a method for evaporating cyclohexanone oxime so as to diminish byproduct formation, and to provide an evaporator to be used for the method. SOLUTION: This method for evaporating cyclohexanone oxime comprises the following practice: a mixture of the cyclohexanone oxime and a diluent therefor is issued via an inlet tube 6 into a fluidized bed 11 where a granular inert matter having a heat capacity enough to feed a heat necessary for evaporating the mixture is fluidized by an inert gas.
Abstract:
PURPOSE: To obtain the subject high-purity compound without forming a by- product by making an isomerization inhibitor coexist in a catalytic hydration reaction system of cyclohexene, dehydrating a formed substance, then reacting it with hydroxylamine and further subjecting the reaction product to Beckmann rearrangement. CONSTITUTION: An isomerization inhibitor in an amount of preferably 240-390ppm such as a cyclic diene is made to coexist in a catalytic hydration reaction system of cyclohexene produced by partial hydrogenation of benzene to form cyclohexanol. Cyclohexanol is dehydrated into cyclohexanone, which is reacted with hydroxylamine to give cyclohexanone oxime. Cyclohexanone oxime is further subjected to Beckmann rearrangement to give the objective compound.
Abstract:
PURPOSE: To provide the method for producing the ε-caprolactam useful on industry, enabling to produce the ε-caprolactam not inferior to the conventional quality at a low cost. CONSTITUTION: The method for producing the ε-caprolactam by hydrating cyclohexene, subjecting the obtained cyclohexanol to a dehydrogenation reaction, reacting the obtained cyclohexanone with hydroxylamine and subsequently subjecting the obtained cyclohexanone oxime to a Beckmann rearrangement, is characterized by reducing indene compounds contained in the cyclohexanol fed to the dehydrogenation reaction to