摘要:
ε -Caprolactam is prepared by subjecting cyclohexanone oxime in a gas phase to a catalytic reaction using zeolite catalysts in the presence of water and at least one compound selected from alcohols and ether compounds.
摘要:
Thermal decomposition of cycloalkanone oximes is inhibited by allowing nitrogen-containing compounds represented by the following formula (1) to coexist with the cycloalkanone oximes: NR₁R₂R₃ (1) (wherein R₁, R₂ and R₃ each represents a hydrogen atom or a lower alkyl group).
摘要:
ε -Caprolactam is prepared by bringing cyclohexanone oxime into contact in gas phase with solid catalysts such as a zeolite catalyst in the presence of at least one nitrogen-containing compound selected from the group consisting of ammonia, methylamines and ε -caprolactam.
摘要:
The invention provides a process for producing high quality ε-caprolactam which comprises allowing crude ε-caprolactam obtained by gas phase Beckmann rearrangement of cyclohexanone oxime to contact with hydrogen at 100-200°C in the presence of a hydrogenation catalyst.
摘要:
A process for producing a high purity caprolactam is disclosed in which a crude caprolactam obtained by a catalytic rearrangement of cyclohexanone oxime is subjected
(1) to mixing, while stirring, with at least one hydrocarbon selected from the group consisting of aliphatic hydrocarbons and alicyclic hydrocarbons to form a liquid-liquid , two-layer liquid mixture, and then crystallizing caprolactam out of the liquid mixture; (2) to mixing with both at least one hydrocarbon selected from the group consisting of aliphatic hydrocarbons and alicyclic hydrocarbons, and water to form a liquid mixture, separating the liquid mixture into a hydrocarbon layer and a water layer, and then recovering caprolactam from the water layer; or (3) to distillation in the co-presence of at least one aliphatic saturated hydrocarbon of 10 to 18 carbon atoms.
摘要:
Thermal decomposition of cycloalkanone oximes is inhibited by allowing nitrogen-containing compounds represented by the following formula (1) to coexist with the cycloalkanone oximes:
NR₁R₂R₃ (1)
(wherein R₁, R₂ and R₃ each represents a hydrogen atom or a lower alkyl group).