The Preparation Of The Cu(Ⅰ)Y Adsorbent And Its Application

This article mainly introduced the preparation of the carbon monoxide adsorbentby ion-exchange at boiled solution, and studied a series of effects on the adsorptionefficiency of prepared adsorbent, such as the kind of the copper salt solution, theconcentration of the copper salt solution, the times of ions exchanging and the time ofthe ions exchanging, et al. Then we researched the adsorption performance of tracecarbon monoxide in fixed bed at30oC and carbon monoxide partial pressure of6kPa.The dynamic adsorption capacity is2.1385mmol/g which was calculated byintegrating the breakthrough curve.The specific surface area of the carbon monoxide adsorbent was determinated bythe BET adsorption instrument. The ion exchange degree was52%and the coppercontent was9.52%(wt) measured by the Inductively Coupled Plasma AtomicEmission Spectrum （ICP）. And through the X-Ray Diffractometer（XRD） andthe Field Emission Scanning Electron Microscope（SEM） found that the carbonmonoxide adsorbent prepared by the cation-exchange between the solutions wherecopper effectively replaced sodium of the original sodium-Y molecular sieve，couldstill maintain the original skeleton structure after calcined. Using NH3-TPDinvestigated the modification to the acidity of adsorbent and using H2-TPR inspectedthe appropriate reduction temperature of the adsorbent.Another important effect of the pressure swing adsorption is the regeneration ofthe adsorbent. This paper concerns the regeneration performance of Cu(I)Y throughthe desorption methods including vacuum and purging by nitrogen at differenttemperature. Comparing the results of adsorption capacity after desorption, theadsorbent was regenerated mostly at130oC with purging nitrogen, and it stillmaintained a stable adsorption capacity after regeneration.According to the theory of the compexation adsorption, the adsorbent Cu(I)Ywas applied to remove the trace amount of dimethyl sulfide. The concentration of thedimethyl sulfide at outlet was detected by the trace sulfur analysis chromatographuntil the concentration of break point. Then the adsorbent capacity of63.12mgS/gadsorbent was calculated by the breakthough curve of dimethyl sulfide. Compared toother adsorbents, the prepared adsorbent Cu(I)Y has a better prospect in theapplication in removing the dimethyl sulfide. On the basis of the experiment of removing carbon monoxide with a single bed,the adsorption breakthrough experiment was simulated with Aspen Adsorptionsoftware and the results were approximately consistent with experimental results.Then additional dynamic simulation on five-bed of separating CO from syngas byVPSA on this adsorbent was studied with Aspen Adsorption software wherein theadsorption pressure was0.68MPa (g) and the desorption pressure is-0.075MPa (g). Inthe results, CO was enriched from32.3%to95.16-98.12%, and the recovery was88.47-99.44%.