THE DETERMINATION OF ADSORPTION ISOTHERMS AND SOLID DIFFUSION COEFFICIENTS OF MANNITOL AND SORBITOL BY LIQUID CHROMATOGRAPHY TECHNIQUE

(整期优先)网络出版时间:1999-01-11
/ 1
Theparameteridentificationmodelisproposedfordeterminingthelinearadsorptionisothermsandthesoliddiffusioncoefficientsbyusingadsorptionchromatorgaphy.Axialdispersioncoefficientsisfirstlydeterminedbypulse-respondexperimenttechniquewithaninertsubstanceastracer,thentheelutioncurvesofchromatographyseparatingtheisomermannitolandsorbitolaredeterminedbythechromatographicmeasuringtechnique,andpinallytheadsorptionisothermsandthesoliddiffusioncoefficientsofmannitolandsorbitolonCa^2+resinsareestimatedbyusingthismodel.Theresultsshowthattheaxialdispersioncoefficientsincreasewithfluidvelocityincreasing,Theadsorptionequilibriumconstantsdecreasewithtemperaturerising;andthesoliddiffusioncoefficientsincreasewithtemperaturerising.Thetheoreticalelutioncurvesaregoodagreementwiththeexperimentalelutioncurvesoftheliquidadsorptionchromatographyseparatingthemannitolandthesorbitol.Themodelprovidesasimpleandreliableproceduretoestimatethekineticandthermodynamicparmetersoftheadsorption.