kinetics regime of mass transfer with chemical reaction

... understanding of the dynamical behaviour of the transesterification reaction in the perspective of mass transfer kinetics Pontryagin Minimum Principle is used for observing the effect of mixing intensity ... dynamics with the help of Hamiltonian The kinetics of the transesterification reaction has been analyzed using numerical methods in presence and absence of the control input Here, mass transfer ... Temperature is one of the most important deciding factors in this regard In fact both reaction rate and mass transfer rate will vary with the change in temperature But the change of mass transfer rate...

Ngày tải lên: 13/08/2014, 14:40

... random molecular motion The fundamental concepts of the mass transfer are 18 Mass Transfer in Chemical Engineering Processes comparable with those of heat conduction which was adapted for the first ... because of the presence of a huge number of barrier particles during the mass transfer The largest possible ratio of the diffusivity of a molecule through the neat polymer ( D ) to that of the ... self-diffusion Mass transfer diffusion mainly occurs in non-equilibrium condition of the chemical potential gradient ( i ) The moleculars move from high chemical potential to low chemical potential of molecular...

Ngày tải lên: 16/02/2014, 19:20

... equation (6-87); dimensionless mass of C/ (mass of A + mass of C) in the raffinate liquids mass ratio in phase L; kg of A k g of A-free L rectangular coordinate mass of C /mass of B in extract liquids ... of B/ (mass of A + mass of C) in the extract liquids number of stages in rectifying section; dimensionless mass of B/ (mass of A + mass of C) in the raffinate liquids number of stages in stripping ... kidney and the mass of urine removed The mass of plasma entering is given by I I 1.0245 g of plasma 100 mL 1584 dL of plasma = 167 780 g of plasma "-,1.0 dL mL ofplasma I I I The mass of plasma remaining...

Ngày tải lên: 02/04/2014, 15:44

... Effect of Mass Transfer on Performance of Microbial Fuel Cell 233 Mostafa Rahimnejad, Ghasem Najafpour and Ali Asghar Ghoreyshi Chapter 12 Mass Transfer Related to Heterogeneous Combustion of Solid ... problems of the mass transfer coupled with the heterogeneous combustion I believe this book will provide its readers with interesting ideas and inspirations or with direct solutions of their ... self-diffusion Mass transfer diffusion mainly occurs in non-equilibrium condition of the chemical potential gradient ( i ) The moleculars move from high chemical potential to low chemical potential of molecular...

Ngày tải lên: 18/06/2014, 22:20

... random molecular motion The fundamental concepts of the mass transfer are 18 Mass Transfer in Chemical Engineering Processes comparable with those of heat conduction which was adapted for the first ... because of the presence of a huge number of barrier particles during the mass transfer The largest possible ratio of the diffusivity of a molecule through the neat polymer ( D ) to that of the ... sensitive incorporated with water vapor permeability Fig shows the amount of water passing through the TFX membrane 24 Mass Transfer in Chemical Engineering Processes as a function of time at different...

Ngày tải lên: 18/06/2014, 22:20

... fraction of surface used for mass transfer P – pressure of the system G – mass flow of the phase GL – liquid mass flow GV – vapor mass flow G - V – gas or vapor rate L – liquid rate M – molecular mass ... gC (26) 48 Mass Transfer in Chemical Engineering Processes ReV   GV aP  V (27) Recently, with the emergence of more modern packing, other correlations to predict the rate of mass transfer in ... molecular weight of liquid MV – molecular weight of vapor ρ – density H – height representation of the mass transfer unit HG – HV – height of gas-side phase transfer unit (m) HL – height of liquid-side...

Ngày tải lên: 18/06/2014, 22:20

... Chemical Engineering of Japan, v 1, 1, pp 56 Onda, K., Sada, E., Takeuchi, H (1968b) Gas absorption with chemical reaction in packed columns Journal of Chemical Engineering of Japan, v 1, 1, pp ... diameter (m) desiccant mass fraction heat transfer coefficient (KW/m2) convective mass transfer coefficient (kg/m2s) enthalpy of air (kJ/kg) length of the wheel (m) air mass flow rate (kg/s) mw ... Effect of Axial Diffusion on Enthalpy Wheels, International Journal of Heat and Mass Transfer, 2006, (49), pp 1412-1419 Zhang, X.J., Dai, Y.J., Wang, R.Z.; “A Simulation Study of Heat and Mass Transfer...

Ngày tải lên: 18/06/2014, 22:20

... along the length of the sand dryer 104 Mass Transfer in Chemical Engineering Processes Fig Prediction of axial gas temperature along the length of the PVC dryer Fig Prediction of axial particle ... rates If the calculated value of diffusive mass transfer is greater than the convective mass transfer, then resistance is said to occur on the external surface of the particle and the CDP dominates ... dominates However, if the diffusive mass transfer is lower than the convective counterpart, then resistance occurs in the core of the particle and diffusion mass transfer dominates The governing...

Ngày tải lên: 19/06/2014, 08:20

... decreased temperature of about 40oC at most during extended time 116 Mass Transfer in Chemical Engineering Processes (a) (b) Fig 3-D mesh plot (a) and contour plot (b) of the effects of extraction temperature ... Mass Transfer in Chemical Engineering Processes (a) (b) Fig 3-D mesh plot (a) and contour plot (b) of the effects of extraction temperature and time on PCO yield (%) in methanol Extraction of ... (b) of the effects of extraction temperature and time on capsaicin in methanolic PCO 121 122 Mass Transfer in Chemical Engineering Processes (a) (b) Fig 3-D mesh plot (A) and contour plot (B) of...

Ngày tải lên: 19/06/2014, 08:20

... potato (Lebovka et al., 2002) Effect of PEF treatment of mass transfer rate from vegetable tissue 5.1 Models for mass transfer from vegetable tissue Mass transfer during moisture removal for ... processing times thanks to the increased mass transfer rates The application of PEF as a permeabilization treatment to increase the rates of mass transfer of valuable compounds from biological matrices ... mechanisms of PEF-induced permeabilization of plant tissues, discusses the methods of detection of electrically induced cell damages and analyses the influence of PEF process parameters on mass transfer...

Ngày tải lên: 19/06/2014, 08:20

... (4) Mass transfer through HFSLM for the separation of the target species in terms of permeability coefficient (P) depends on the overall mass transfer resistance To determine the overall mass transfer ... the mass transfer rates of polyphenols through the cellular barriers Moreover, higher intensity of PEF treatment resulted in both faster mass transfer rates and higher final concentration of polyphenols ... permeabilization Mass Transfer Enhancement by Means of Electroporation 171 Assuming that the resistance to mass transfer through the vacuole membrane is the rate determining step, the fact that the mass transfer...

Ngày tải lên: 19/06/2014, 08:20

... Forward reaction rate constant (cm3/mgmin) Feed- or aqueous-phase mass transfer coefficient or mass transfer ki coefficient in feed phase km Organic-phase mass transfer coefficient or mass transfer ... description of unsteady mass transfer of gases in membranes is presented in this work Examples of binary gas mixture separation are considered for three cases of gas 206 Mass Transfer in Chemical ... Volumetric flow rate of stripping solution (cm3/s) Reaction rate rA Average value of the reaction rate of copper ions RH General form of the extractant Inside radius of the hollow fiber (cm)...

Ngày tải lên: 19/06/2014, 08:20

... phenomenological description of dynamics of mass transfer of O2, N2 and CO2 in breathing apparatus of humans and animals for understanding of functioning of live organisms 230 Mass Transfer in Chemical Engineering ... and reversible reaction of bicarbonate ions with releasing of CO2 on the other side of membrane on the other hand Therefore the time of achievement of the steady state of CO2 transfer is higher ... leads to slowing down of its diffusion and decreasing of efficiency of oxygen from nitrogen separation 4.3 Example of modeling of unsteady CO2 transfer in liquid membrane with chemical absorbent...

Ngày tải lên: 19/06/2014, 08:20

... (c) Fig Effect of active biofilm on anode surface with CV analysis (a) absence of biofilm ,(b) after formation of biofilm with out mediators and (c) after formation of biofilm with 200 µmol.l-1 ... Current (mA.m ) (b) Fig Effect of mass transfer area on performance of MFC 800 242 Mass Transfer in Chemical Engineering Processes of MFC Three different mass transfer area (3.14, 9and 16 cm2) ... bioelectricity The aim of this research was to found optimum effect of mass transfer area on production of power in the fabricated MFC Figure shows the effect of mass transfer area on performance...

Ngày tải lên: 19/06/2014, 08:20

... Heterogeneous Kinetics in the Chemical Reaction/ Diffusion Controlled Region Kinetics of C + CO2→ 2CO at 1200-1600°C Ind Eng Chem Fundam., Vol 16, No 2, pp 235-242, ISSN 0196-4313 13 Mass Transfer ... aerothermochemical analysis has been conducted, based on the chemically reacting boundary layer, with considering the surface C-O2 and C-CO2 reactions and the gas-phase CO-O2 reaction By virtue of the ... nearly-frozen regime, a partial-burning regime, a premixed-flame regime, and finally a near-equilibrium regime Ignition can be described in the nearly-frozen regime, while extinction in the other three regimes...

Ngày tải lên: 19/06/2014, 08:20

... w x Y y dimensional mass burning (or combustion) rate ratio of heats of combustion in the gas phase heat of combustion per unit mass of CO universal gas constant curvature of surface or radius ... establishment of COflame, facilitated even in the fast airflow with a=3300 s-1, because of the increased H2O massfraction As for the combustion in the room-temperature airflow with a=820 s-1, ... airflow by about 30%, because of the reduced mass- transfer rate of oxygen, due to thickened boundary layer (Makino, et al., 2003), through overcoming an increase in the mass diffusivity (D ~ )...

Ngày tải lên: 19/06/2014, 08:20

... random molecular motion The fundamental concepts of the mass transfer are 18 Mass Transfer in Chemical Engineering Processes comparable with those of heat conduction which was adapted for the first ... because of the presence of a huge number of barrier particles during the mass transfer The largest possible ratio of the diffusivity of a molecule through the neat polymer ( D ) to that of the ... self-diffusion Mass transfer diffusion mainly occurs in non-equilibrium condition of the chemical potential gradient ( i ) The moleculars move from high chemical potential to low chemical potential of molecular...

Ngày tải lên: 26/06/2014, 23:20

... Fig-5.14: DOSs of H-terminated 2×1 surfaces (a) surface B of the 2×1_clean; (b) surface N of the 2×1_clean; (c) surface B of the 2×1_BHNH; (d) surface N of the 2×1_BHNH; (e) surface B of the 2×1_BH; ... vies …….112 Fig-5.2: Density of state of B-terminated (111)-1×1 for (a) Surface B atom of clean surface (b) Surface B atom of H absorbed surface (c) Surface B atom of O absorbed surface (d) Absorbed ... self-assembly of C2 biradical with consequent gain in surface energy The self-assembly of C2H2 on the top Pandey chain results in the formation of polyethylene that follows the zig-zag course of the...

Ngày tải lên: 17/09/2015, 17:18

... pump with the irreversibility of mass transfer and the mass leak Lin et al [30] studied the performance of the irreversible two -mass- reservoir chemical pump with the irreversibility of mass transfer, ... rate of energy pumping and the COP of four -mass- reservoir chemical pump with the diffusive mass transfer law and linear mass transfer law are shown in Figure The curve with diffusive mass transfer ... studied its performance with linear mass transfer law Wu et al [32] studied the performance of a three -mass- reservoir chemical pump with the irreversibility of mass transfer and mass leak Xia et al...

Ngày tải lên: 05/09/2013, 15:28

... monitoring of trace amounts of chemicals We have extended the application of EESI to instantly follow organic chemical reactions in a straightforward manner, with a rather simple setup Two important chemical ... complicated chemical reactions (e.g heterogeneous chemical reaction, and reactions involving catalysts) Compared with other available techniques, EESI-MS allows a better control of chemical and ... Monitoring of organic chemical reactions using EESI-MS Figure Mass spectra of the Michael addition reaction recorded at 20, 60 and 300 min, respectively Inserts: molecular structures of PEA, PEAP...

Ngày tải lên: 14/02/2014, 08:20