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Cyclohexanone oxime, conversion into

Another process is the conversion of toluene into caprolactam that provides an alternative basic building block for this chemical other than benzene. Toluene is oxidized to benzoic acid, and hydrogenation to cyclohexanecar-boxylic acid is followed by treatment with nitrosylsulfuric acid to form cyclohexanone oxime followed by rearrangement to caprolactam. [Pg.526]

The conversion of oximes into amides or lactams (reactions 6 or 7), in particular, e-caprolactam from cyclohexanone oxime (X = H), is catalyzed by [NBu4][Re04] andCFsSOsH in refluxing nitromethane, via a postulated perrhenic ester of oxime [RR C=N-0-Re03]. ... [Pg.4769]

The second TS-1 based process which is likely to go into commercial production is the synthesis of cyclohexanone oxime from cyclohexanone, ammonia, and hydrogen peroxide (Roiiia et al., 1990) (reaction 6.13), which is the first step in the preparation of e-caprolactam (Montedipe, pilot plant). Oxime selectivity is >98% at a conversion of 99.9%. [Pg.141]

E-Caprolactam (CL) is a very important monomer for the production of nylon-6, and about 4.2 million tons of CL were manufactured worldwide in 1998 [126]. Most current methods of CL production involve the conversion of cyclohexanone with hydroxylamine sulfate into cyclohexanone oxime followed by Beckmaim rearrangement by the action of oleum and then treatment with ammonia, giving CL. A serious drawback ofthis process is the co-production of a large amount of ammonium sulfate waste [126, 127]. Raja and Thomas reported a method for one-step production of cyclohexanone oxime and CL by the reaction of cyclohexanone with ammonia under high-pressure air (34.5 atm) in the presence of a bifunctional molecular sieve catalyst [128]. Hydrogen peroxide oxidation of cyclohexanone in the presence of NH3 catalyzed by titanium silicate is reported to produce CL [129]. In patent work, on the other hand, the transformation of l,l -peroxydicyclohexylamine (PDHA) to a 1 1 mixture of CL and cyclohexanone by LiBr has been reported [130]. [Pg.210]

The stepwise conversion of N-cyclohexanone oxime into 6-caprolactam via the vapour-phase Beckmann rearrangement on a number of modified zeolite systems was studied by a variety of different solid-state NMR techniques, including N and CP MAS NMR spectroscopy. The zeolite materials are characterized by H, Si, and N MAS NMR... [Pg.277]


See other pages where Cyclohexanone oxime, conversion into is mentioned: [Pg.139]    [Pg.53]    [Pg.344]    [Pg.142]    [Pg.30]    [Pg.619]    [Pg.234]    [Pg.142]    [Pg.110]    [Pg.296]    [Pg.815]    [Pg.804]    [Pg.228]    [Pg.228]    [Pg.957]    [Pg.196]    [Pg.228]    [Pg.397]   


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