Improved evaporation methods for the system ethanol + cyclohexanone oxime

The heterogeneously catalyzed gas phase Beckmann rearrangement for the production of ε-caprolactam — the precursor of the polyamid Nylon-6 — requires the evaporation of the reactant mixture cyclohexanone oxime + ethanol in such a way that the formation of thermodynamically preferred byproducts, whic...

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Bibliographic Details
Published in:Chemical engineering science 2001-12, Vol.56 (23), p.6661-6666
Main Authors: Dahlhoff, Gerd, Sbresny, André, Hölderich, Wolfgang F.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Cyclohexanone oxime
Devices using thermal energy
Energy
Energy. Thermal use of fuels
Evaporation
Exact sciences and technology
Flash evaporator
Fluidized bed evaporator
Heat exchangers (included heat transformers, condensers, cooling towers)
Heat exchangers and evaporators
ε-Caprolactam
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Summary:The heterogeneously catalyzed gas phase Beckmann rearrangement for the production of ε-caprolactam — the precursor of the polyamid Nylon-6 — requires the evaporation of the reactant mixture cyclohexanone oxime + ethanol in such a way that the formation of thermodynamically preferred byproducts, which strongly influence the product quality, is minimized. To optimize the evaporation process a fluidized bed evaporator, a flash evaporator and a pipe evaporator are compared. The lowest average by product formation was observed with the fluidized bed evaporator (0.69%), followed by the flash evaporator (1.67%) and the pipe evaporator (2.75%).
ISSN:0009-2509
1873-4405
DOI:10.1016/S0009-2509(01)00350-5