01538nas a2200157   4500008004100000245011000041210006900151260000800220300001200228490000800240520094400248100002201192700002101214700002101235856012401256       2017                        eng d00aComparative analysis of extractive and pressure swing distillation for separation of THF-water separation0 aComparative analysis of extractive and pressure swing distillati  cAUG  a188-2000 v1033 aIn the present work, extractive and pressure-swing distillation methods are analyzed in detail through steady state ASPEN Plus simulations to propose the most economic method for separation of equimolar mixture of THF-Water. Various solvents were evaluated and DMSO was identified as the most appropriate solvent, as it gave minimum Total Annual Cost (TAC) for desired purity. In case of pressure swing distillation, various pressure ranges were explored to achieve minimum TAC. Configurations for extractive and pressure swing distillation with heat integration were also worked out. The optimum designs of extractive and pressure swing distillation with and without heat integration were compared on a common basis of feed conditions and purity constraints. Results indicate that TAC of extractive distillation with heat integration is 5.2% less than that of PSD with partial heat integration. (C) 2017 Elsevier Ltd. All rights reserved.1 aGhuge, Pravin, D.1 aMali, Nilesh, A.1 aJoshi, Sunil, S.  uhttps://library.ncl.res.in/content/comparative-analysis-extractive-and-pressure-swing-distillation-separation-thf-water02238nas a2200169   4500008004100000022001400041245009300055210006900148260000900217300001600226490000700242520162900249100002301878700002101901700002201922856012401944       2023                        eng d  a0888-588500aContinuous hydrogenation of cinnamaldehyde: gas-liquid-liquid-solid helical coil reactor0 aContinuous hydrogenation of cinnamaldehyde gasliquidliquidsolid   cAUG   a19250-192610 v623 a<p>
	The advantages and challenges of using the gas-liquid-liquid-solid(GLLS) hydrogenation system are discussed in this work using the caseof selective hydrogenation of cinnamaldehyde to cinnamyl alcohol (animportant ingredient in the perfume and flavoring industry). The fourphases in this system include gas (hydrogen)-liquid (organic, reactant+ solvent)-liquid (aqueous KOH)-solid (5% Pt/C catalyst). The additionof second liquid phase, i.e., aqueous KOH significantly increasesselectivity toward cinnamyl alcohol compared to the conventional three-phasehydrogenation. The four-phase GLLS reactions were carried out andoptimized in a continuous helical coil reactor. The role of key aspectssuch as gas solubility, kinetics, flow hydrodynamics, axial dispersion,and mass transfer on the performance of a continuous GLLS reactoris presented and discussed in this work. The presented results anddiscussion will be useful for addressing conflicting demands likelong residence time, low axial dispersion, and high mass transfer.The experimental studies and results of the developed mathematicalmodel indicate that the continuous GLLS helical coil reactor outperformsthe batch operation. The production rates (kg day(-1)) of cinnamyl alcohol achieved in continuous operation were at leastdouble in comparison to batch operation, with 32% less consumptionof precious catalyst (per kg of product). The presented results will open up new opportunities for enhancing selectivity and overall performanceof hydrogenations via introducing a second immiscible liquid phaseand designing continuous tubular reactors for the same.</p>
1 aKhan, Muzammil, Y.1 aJoshi, Sunil, S.1 aRanade, Vivek, V.  uhttps://library.ncl.res.in/content/continuous-hydrogenation-cinnamaldehyde-gas-liquid-liquid-solid-helical-coil-reactor