DETERMINATION OF SURFACE-AREAS OF ACTIVE CARBONS BY RETENTION OF ETHYLENE-GLYCOL AND ETHYLENE-GLYCOL MONOETHYL ETHER

Experiments of ethylene glycol and ethylene glycol monoethyl ether ret ention on some active carbons were carried out to measure the surface areas of the carbons. Some differences were observed between nitrogen- specific surface area values and those obtained from ethylene glycol r etention. However, since the differences decreased through an increase of surface oxygen content as a result of treatment of the carbons wit h H2O2, it was evident that ethylene glycol retention depended upon th e surface oxygen content. Also, the surface area values obtained from retention of ethylene glycol monoethyl ether did not depend upon the s urface oxygen content. Measurements of the ethylene glycol monoethyl e ther retention process could be performed in a shorter time than the e quivalent ethylene glycol retention measurements.