02255nas a2200241   4500008004100000022001400041245008500055210006900140260007400209300000900283490000800292520136100300653002501661653003701686653002201723653003001745100002601775700002201801700002601823700002401849700002301873856011701896       2013                        eng d  a0049-697900aDefluoridation of drinking water using pural (R) MG-20 mixed hydroxide adsorbent0 aDefluoridation of drinking water using pural R MG20 mixed hydrox  aVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDSbSPRINGERcSEP  a17270 v2243 a<p>The potential ofmixed alumina-magnesia hydroxide adsorbent (PURAL (R) MG-20) for defluoridation of drinking water using batch and continuous mode of operations has been reported in the present article. Systematic adsorption experiments were carried out to elucidate the effects of different process parameters such as adsorbent dose, initial fluoride concentration, pH of the solution and effect of other ions (usually present in groundwater). These studies were aimed to understand the adsorption behaviour of the PURAL (R) MG-20 adsorbents. Fluoride adsorption by PURAL (R) MG-20 sorbent was found pH dependent. Maximum fluoride removal efficiency was observed in the range of pH 5-7. Langmuir isotherm described the data better than Freundlich and Temkin isotherm models and the adsorption capacity was found to be 5.62 mg g(-1) at initial fluoride concentration of 5.13 mg L-1, pH 7 and contact time 24 h. The kinetic result shows that the fluoride sorption follows pseudo-second-order kinetics. Column breakthrough studies were performed to test the performance of the adsorbent media at continuous mode of operation. Thus, it can be concluded that PURAL (R) MG-20 adsorbent can be used directly for field applications since it shows high fluoride uptake capacity under simulated drinking water conditions and it is also commercially available.</p>10aBreakthrough studies10aDefluoridation of drinking water10aKinetic modelling10aMixed hydroxide adsorbent1 aPatankar, Gaurang, V.1 aTambe, Amruta, S.1 aKulkarni, Bhaskar, D.1 aMalyshew, Alexander1 aKamble, Sanjay, P.  uhttps://library.ncl.res.in/content/defluoridation-drinking-water-using-pural-r-mg-20-mixed-hydroxide-adsorbent-002227nas a2200253   4500008004100000022001400041245012500055210006900180260000800249300001100257490000800268520135000276653001501626653002201641653001301663653002001676653002201696653003501718100002501753700002101778700002601799700002201825856012601847       2021                        eng d  a0255-270100aUltrasound assisted curcumin recovery from Curcuma aromatica: understanding the effect of different operating parameters0 aUltrasound assisted curcumin recovery from Curcuma aromatica und  cDEC  a1086040 v1693 aThe present study deals with intensified extraction of curcumin from Curcuma aromatica by employing ultrasound-assisted extraction (UAE) approach also elucidating comparison with the conventional batch extraction to highlight the intensification benefits based on the usage of ultrasound. Understanding into the effect of operational parameters like type of solvent, extraction temperature, solid to solvent ratio and raw material size distribution as well as the equipment operating conditions as frequency and power on the extraction yield has been developed. Based on the results for extraction yield, the optimum conditions for UAE approach were 40 degrees C as temperature, 1:30 as solid to solvent ratio, 0.09 mm as the mean particle size, 240 W as ultrasonic power, 22 kHz as ultrasonic frequency and ethanol as the most suitable solvent. Under these optimum conditions, the highest extraction yield of 73.18% was achieved in 2 h whereas batch extraction for 14 h resulted in 52.31% yield clearly demonstrating the intensification due to ultrasound. Peleg's model was applied to explain the extraction kinetics of curcumin and the proposed model satisfactorily predicted the rates of extraction of cur cumin. Overall, UAE proved to be a better technique in terms of lesser time, lesser heating requirement and additional extraction yield.10aCavitation10aCurcuma aromatica10acurcumin10aIntensification10aKinetic modelling10aUltrasound assisted extraction1 aShirsath, Sachin, R.1 aSable, Sunil, S.1 aGaikwad, Shashank, G.1 aGogate, Parag, R.  uhttps://library.ncl.res.in/content/ultrasound-assisted-curcumin-recovery-curcuma-aromatica-understanding-effect-different02183nas a2200241   4500008004100000022001400041245011100055210006900166260000800235300001000243490000800253520135800261653001901619653001801638653002501656653002201681653001301703100002601716700002101742700002301763700002901786856012601815       2024                        eng d  a0263-876200aExperimental and kinetic modelling studies for the design of fixed bed methanol reactor over CuZA catalyst0 aExperimental and kinetic modelling studies for the design of fix  cMAY  a79-900 v2053 a<p>
	Direct conversion of CO 2 via hydrogenation to value-added chemicals is a vital approach for utilising CO 2 emitted into the atmosphere. In this paper, a critical analysis of reaction kinetic modelling studies is explored in a fixed bed reactor to improve methanol yield for different H 2 to CO 2 ratios by simulating a lab-scale reactor for adiabatic and isothermal conditions. The feed inlet temperature and pressure variations are applied to study the effect of both configurations on methanol production. The results show that the isothermal configuration yields 2.76% more methanol yield compared to the adiabatic reactor. The effect of H 2 to CO 2 molar ratios of 3, 6 and 9 on the performance of the catalyst and the influence of CO and CO 2 hydrogenation is investigated with model simulations. The overall methanol yield is increased from 19.03% to 36.41% with increase in H 2 to CO 2 molar ratio from 3 to 9. Experiments are performed using commercial copper-based catalyst for different temperatures of 210, 230 and 250 degrees C at a pressure of 40 bar for H 2 /CO 2 of 3 and GHSV of 720 h -1 as well as at optimal temperature of 250 degrees C and 50 bar with varying H 2 /CO 2 of 3, 6, 9 for 3 g and 6 g catalyst. The maximum methanol yield of 2.53% and space time yield of 13.59 mg/g cat .h is obtained at H 2 /CO 2 ratio of 9.</p>
10aCO2 conversion10aCuZA catalyst10aH2 toCO2 molar ratio10aKinetic modelling10aMethanol1 aBagwan, Farahanaz, M.1 aDongapure, Pavan1 aKulkarni, Amol, A.1 aVasireddy, Satyam, Naidu  uhttps://library.ncl.res.in/content/experimental-and-kinetic-modelling-studies-design-fixed-bed-methanol-reactor-over-cuza02284nas a2200229   4500008004100000022001400041245013800055210006900193260000800262300001200270490000800282520147000290653001401760653002201774653002301796653002201819653002201841653001601863100002401879700002601903856012501929       2025                        eng d  a0360-319900aOptimizing H2/CO2 binary gas mixture separation using Li-K-ETS-10 zeolite: Breakthrough analysis and impact of operational conditions0 aOptimizing H2CO2 binary gas mixture separation using LiKETS10 ze  cMAR  a673-6830 v1053 a<p>
	The polycation-exchanged ETS-10 (Li-K-ETS-10) zeolite was employed as a sorbent in breakthrough experiments using a binary H2/CO2 (75/25%) gas mixture. The data compared with parent adsorbent (NaK)-ETS-10, and mono cation exchange of ETS-10 (K-ETS-10 and Li-ETS-10). Adsorbents underwent for various characterization including XRD, Raman, FTIR, EDS, CO2-TPD, BET surface area, and pore diameter of samples to understand the physicochemical properties. CO2-TPD shows that Li-K-ETS-10 has higher basicity than parent (NaK)-ETS-10. The process parameters were optimized to ensure a higher CO2 sorption capacity and better H2 purity including effects of flow rate, pressure, temperature, feed concentration, bed height, and recyclability. The adsorption capacities of CO2 and H2 were found to be 1.57 mmol g- 1 and 0.24 mmol g-1, respectively, at 1 bar and a flow rate of 200 mL min- 1. These values represent a 40% improvement over (NaK)-ETS-10 and a-10.4% improvement over Li-ETS-10. At 6 bar, the CO2 and H2 adsorption capacities reached 2.79 mmol g- 1 and 0.22 mmol g-1, respectively. The higher CO2 sorption over Li-K-ETS-10 leads due to improve in basic sites and physical properties of sample compare to studied adsorbent. The experimental data of binary gas mixture was used to evaluate the kinetic models including Thomas, and Yoon-Nelson. This results implies that Li-K-ETS-10 is the promising candidates for H2 separation from binary gas mixture.</p>
10aadsorbent10aBinary gas stream10aBreakthrough study10aH2/CO2 separation10aKinetic modelling10aLi-K-ETS-101 aShrotri, Aadesh, R.1 aNandanwar, Sachin, U.  uhttps://library.ncl.res.in/content/optimizing-h2co2-binary-gas-mixture-separation-using-li-k-ets-10-zeolite-breakthrough