Continuous process for preparing caprolactam

Details Continuous process for preparing caprolactam Continuous process for preparing caprolactam

2008-03-04

2008-03-04

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

10557753

ABSTRACT:
The invention relates to a continuous process for preparing caprolactam by Beckmann rearrangement of cyclohexanone oxime, said process comprisinga) feeding (i) oleum and (ii) cyclohexanone oxime into a first reaction mixture comprising caprolactam, sulfuric acid and SO3,b) feeding (iii) a portion of the first reaction mixture and (iv) cyclohexanone oxime into a second reaction mixture comprising caprolactam, sulfuric acid and SO3,c) withdrawing a portion of the second reaction mixture, wherein the process further comprises obtaining the cyclohexanone oxime that is fed to the reaction mixtures by:1) preparing an organic medium comprising cyclohexanone oxime dissolved in an organic solvent2) separating, by distillation, cyclohexanone oxime from said organic medium.

REFERENCES:
patent: 2237365 (1941-04-01), Schlack et al.
patent: 3914217 (1975-10-01), Smith
patent: 3953438 (1976-04-01), Koppel
patent: 0 785 188 (1997-07-01), None
U.S. Appl. No. 10/557,771, filed Nov. 29, 2006.

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