Patent · US Expired

Process for producing epsilon-caprolactam and apparatus for the process

US6482945B2 · kind B2 · utility

1Cited by

3References

7Claims

0Family size

Assignee

SUMITOMO CHEMICAL COMPANY, LIMITED · JP

Inventors

Wolfgang Holderich · Bischofswerda, DE
Gerd Dahlhoff · Bergheim, DE
Andre Sbresny · Aachen, DE
Hiroshi Ichihashi

Key dates

Filing date	Sep 28, 2001
Grant date	Nov 19, 2002
Priority date	—
Expiry date	Sep 28, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D201/04
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process is provided for producing &egr;-caprolactam from cyclohexanone oxime. The process comprises a evaporation step of a mixture of cyclohexanone oxime and a solvent by introducing the mixture into a fluidized bed in which inert particles is fluidized by an inert gas, the particles having heat enough to evaporate the mixture; and a rearrangement step of cyclohexanone oxime in the evaporated mixture into &egr;-caprolactam by a gas phase Beckmann rearrangement reaction using a solid catalyst, excluding a catalyst consisting of a boric acid or a boron oxide.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.