Abstract:
Cyclohexane is oxidised by air in a series of three reactors,
endothermically at l650C and 10.5 bar in the presence of boiler acid to
produce a mixture of cyclohexanone and cyclohexanol, called ketone-alcohol
(KA) oil. Overhead gases are condensed to remove most of the contained
cyclohexane from N2, CO and CO2.
KA oil is oxidised to adipic acid using nitric acid in a two stage reaction
system operating at 700C and lOOC respectively. Total residence time
is one and a half hours. Crude product is crystallised producing 95 percent
adipic acid after centrifuging. This is recrystallised, dried and bagged.
