Organic compounds -- part of the class 532-570 series – Organic compounds – Unsubstituted hydrocarbyl chain between the ring and the -c-...
Reexamination Certificate
2008-04-15
2008-04-15
Kifle, Bruck (Department: 1624)
Organic compounds -- part of the class 532-570 series
Organic compounds
Unsubstituted hydrocarbyl chain between the ring and the -c-...
Reexamination Certificate
active
10557770
ABSTRACT:
The invention relates to a process for preparing caprolactam by admixture of cyclohexanone oxime to a reaction mixture comprising caprolactam and sulfuric acid using a mixing device, said mixing device comprising (i) a tube through which the reaction mixture can flow, and (ii) channels disposed around the tube, said channels opening into the tube, said process comprising: passing the reaction mixture through the tube, and feeding the cyclohexanone oxime into the reaction mixture through one or more of said channels, wherein Re>5000, Re being the Reynolds number as defined by ρ·V·D/η, whereinρ=density (in kg/m3) of the reaction mixture that is fed to the tubeV=velocity of the reaction mixture, V being defined as W/A, wherein W is the flow rate (in m3/s) of the reaction mixture that is fed into the tube and A is the cross section area of the tube (in m2) at the level where said channels open into the tubeD=diameter of the tube at the level where said channels open into the tube (in m)η=viscosity of the reaction mixture that is fed into the tube (in Pa·s).
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Cheng Peter Wei-Hae P. W-H.
Lemmens Joannes Albertus Wihelmus J. A. W.
Mostert Frank F.
Smeets Theodorus Maria T. M.
DSM IP Assets B.V.
Kifle Bruck
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