Anshu Nanoti

THE REMOVAL OF FURFURAL FROM WATER BY ADSORPTION WITH POLYMERIC RESINS

The removal of furfural from water by adsorption on a polymeric resin XAD-4 was studied. Equilibrium isotherm measurements were made and column dynamic data collected under various sets of operating conditions. The axial-dispersed plug-flow model was used to simulate the experimental data. The linear driving force parameters required in these simulations were determined independently of the column measurements, providing a more versatile simulation model. The model predicts the breakthrough curves with a fair degree of accuracy.

Carbon Di-Oxide Removal with Mesoporous Adsorbents in a Single Column Pressure Swing Adsorber

Abstract A five-step PSA cycle was studied for CO2 separation from CO2-N2 gas mixture in a single column at elevated temperatures using Poly-ethyleneimine (PEI) impregnated mesoporous silica SBA-15 as adsorbent. The PSA cycle study included a strong adsorptive rinse step in which the strongly adsorbed component, i.e., CO2 was used for rinsing the adsorbent bed in order to increase the purity of CO2 product. The study indicates that the adsorbent is regenerable under typical PSA conditions. The productivity of the adsorbent studied for CO2 separation was found to be comparable with commercial zeolite adsorbents as reported in literature.

A vapor phase adsorptive desulfurization process for producing ultra low sulphur diesel using NiY zeolite as a regenerable adsorbent

A NiY zeolite based vapor phase adsorptive desulfurization process has been described which can bring down sulphur concentration of a commercial BS IV grade (Euro IV equivalent) diesel from 50 ppm to a <5 ppm level. Compared to literature reports on fixed bed adsorptive desulfurization of diesel using zeolite adsorbents, the present process has the advantage of easy regenerability of the adsorbent with minimum temperature swing between adsorption and regeneration steps. Multi cycle stability of the desulfurization performance was also demonstrated.

[Cu3(BTC)2]-polyethyleneimine: an efficient MOF composite for effective CO2 separation

Increased CO2 concentration in the earth’s atmosphere results in global warming and has increased concerns towards the development of efficient strategies for carbon capture and storage. CO2 separation from flue gas is one of the most challenging areas. Here, a Cu-BTC MOF and a series of polyethyleneimine (PEI) incorporated Cu-BTC composites (Cu-BTC–PEI) with different loading amounts of PEI have been developed for CO2 separation. A significant increase in CO2 adsorption capacity was observed with Cu-BTC–PEI adsorbents. Detailed characterization of the developed adsorbents was done using XRD, SEM, BET surface area and IR. The synthesized adsorbents show good CO2/N2 selectivity for a designed flue gas composition containing 15 vol% CO2 and the remainder as N2. 2.5 wt% PEI loaded Cu-BTC (Cu-BTC–PEI-2.5) has shown a CO2 adsorption capacity of 0.83 mmol g−1 at a pressure of 0.15 bar and 25 °C which is almost double that of Cu-BTC in similar conditions. But at an elevated pressure of 5 bar and 25 °C, 1 wt% PEI loaded Cu-BTC (Cu-BTC–PEI-1) performed even better with a CO2 adsorption capacity of 10.57 mmol g−1. Better adsorption capacity and selectivity for CO2 was obtained with Cu-BTC–PEI composites and they are good aspirant adsorbents for CO2 separation from flue gas.