Study On Adsorption Of Cation And Colored Materials From Clarified Liquid Of Jerusalem Artichoke By Ion Exchange

Inulin production industry in our country developed lately. Many domestic inulinapplication enterprises still need import inulin primarily. Detailed research ofproduction process of inulin has an important significance. The refining stage is thekey step to impact the quality of inulin. The decoloring cost of production accountsfor about a third of total cost of production. In this paper, ion exchange asorptiontechnology was applied on desalination and decolration of clarified solution fromJerusalem artichoke and it obtained ideal purification effect.Comparation between001x7, D001-SS, D151cationic resin was carried byadsorption capacity and adsorption rate in desalination stage, choose D001-SS resinfor adsorption of clarified liquid from Jerusalem artichoke. Static adsorptionexperiments were conducted to study pH value of solution, adsorption temperature,time on asorption effect. In the decoloration stage, three anions resin D280, D296R,D301T and two punched adsorption resin AB-8, D3520were compared by adsorptioncapacity and absorption rate. Choose resin D296R for adsorption of pigment. Throughthe static and dynamic adsorption tests, resin mess, the initial pH value of solution,adsorption temperature, solution impurities, velocity, high diameter ratio of exchangecolumn were researched on decolration effect. Finally, thermodynamics and kineticsanalysis were conducted for pigments asorption. In this paper, four pillars continuousdynamic adsorption device were dsigned which can carry out continuous desalinationand decoloration operation.Influence of Ca²⁺and Mg²⁺in the solution on decoloration ratio were investigated.It was showed that Ca²⁺and Mg²⁺can obviously cause the decolored ratio drop down.When the concentration of Ca²⁺or Mg²⁺was1mmol/L, the decoloration ratiodecreased by20.5%and31.5%respectively.Static tests in desalination process showed that: It obtained best adsorption effectin neutral pH value for clarified liquid from Jerusalem artichoke;40oC was suitablefor adsorption; Adsorption time was40min, ensure adsorption capacity of resin toachieve maximum0.788mmol/g. Resin regeneration tests, the regeneration5%HCIsolution for liquid dosage3.3times the volume of resin was reasonable, first timeregeneration rate was92.1%. static tests for decoloration indicated that:100ml solution match to1.3g resin.Keep the original weak acid solution to adsorption; Adsorption was carried at40oCfor the best adsorption effect. Dynamic tests showed that: Breakthrough volume was390mL for10mL resin; Bigger high diameter ratio of exchange column can bebeneficial for absorption, so choose15exchange colomn for application, highdiameter ratio was7.5; Flow velocity was4mL/min for the best adsorption effect.Breakthrough volume reached the maximum for390mL. Resin regeneration testshowed that the regeneration rate of resin can maintain more than85%after16timesregeneration.thermodynamic study showed that Langmuir equation can better describeadsorption process of pigments by resin. Adsorption tends to single molecule layerabsorption. Adsorption process was spontaneous （Δ G <0）. Adsorption impetus wasstronger as the temperature incresed. Adsorption process is entropy promoted （Δ S>0）endothermic （Δ H>0）. Dynamics research showed that the adsorption of pigmentwell followed square dynamic model. Adsorption rate was controlled by particlediffusion and it fitted the square dynamic model.