Ion exchange purification method of aqueous caprolactam solution

Details Ion exchange purification method of aqueous caprolactam solution Ion exchange purification method of aqueous caprolactam solution

1991-11-15

1993-09-14

Bond, Robert T.

Organic compounds -- part of the class 532-570 series

Organic compounds

Unsubstituted hydrocarbyl chain between the ring and the -c-...

540456, C07D20116

Patent

active

052450295

ABSTRACT:
Disclosed is an ion exchange purification method of an aqueous caprolactam solution in a process for producing caprolactam and laurolactam by subjecting a mixture of cyclohexanone oxime and cyclododecanone oxime to Beckmann rearrangement in the presence of sulfuric acid and fuming sulfuric acid, which comprises, after neutralization of the rearrangement reaction products, and first extraction thereof with an organic solvent and second extraction of the first extract with water to obtain a second extract of an aqueous caprolactam solution, treating the aqueous caprolactam solution obtained by extraction with an organic solvent immiscible with water with a strongly acidic cation exchange resin, and subsequently with a weakly basic anion exchange resin or further with a strongly basic anion exchange resin.

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patent: 3470153 (1969-09-01), Shultze et al.
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