PROCESS AND APPARATUS FOR PREPARING ADIPIC ACID BY CATALYTIC AIR OXIDATION OF CYCLOHEXANE

WIPO Patent Application WO/2010/020080

A1

Disclosed is a process and an apparatus for preparing adipic acid by catalytic air oxidation of cyclohexane. A cyclohexane containing dissolved 1-50 ppm monometalloporphyrin or mu-oxobimetalloporphyrin or their mixture with the salt or oxide of transitional metal as catalyst is oxidized for 45-120 minutes in multi-staged oxidation reactors with gas distributor. The mixture obtained by oxidation is fed into a flash separator, and the products with low boiling points of cyclohexane, cyclohexanol and cyclohexanone turn into gas and separate from adipic acid whose content exceeds 80%. The products with low boiling points are then recycled continuously for oxidation, and the products with high boiling points are separated and purified to obtain the purified adipic acid. The direct air oxidation of cyclohexane into adipic aicd is achieved. The conversion rate of cyclohexane reaches 95% and the yield of adipic acid reaches 70%.

JPS5782383	MANUFACTURE OF MALEIC ACID ANHYDRIDE
WO/1999/067021	PROCESS FOR THE PREPARATION OF IMPROVED VANADIUM-PHOSPHORUS CATALYSTS AND USE THEREOF FOR THE PRODUCTION OF MALEIC ANHYDRIDE
JP2974826	PREPARATION OF CATALYST FORPRODUCING METACROLEIN AND METHACRYLIC ACID

GUO CANCHENG (CN)
XU QINGLI (CN)
LUO WEIPING (CN)
LIU QIANG (CN)

PCT/CN2008/001809

February 25, 2010

October 28, 2008

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GUO CANCHENG (CN)
XU QINGLI (CN)
LUO WEIPING (CN)
LIU QIANG (CN)

C07C51/215; B01J31/12; C07C27/12; C07C55/14

CN1850756A	2006-10-25
CN1535947A	2004-10-13

CHANGSHA ZONEKEY PATENT LAW FIRM (Changsha, Hunan 1, CN)

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