92 research outputs found
Modelling and simulation Of electrochemical processes
Conventional reaction engineering technique may be applied to electrolytic process with emphasis on residence time distribution (RTD) metho
Modelling and simulation of electrochemical processes
Conventional reaction engineering technique may be applied to electrolytic process with emphasis on residence time distribution (RTD) metho
Modeling in Electrochemical Engineering – A critical review
In its 60 years life what has electrochemical engineering (ECE) contributed to society? Firstly, we have invented and
developed processes to create new materials, more gently and more efficiently, so as to make life easier for all.
Secondly, ECE has changed our accepted concepts and our ways of thinking in science and technology. Here modeling stands out as the primary development. Let us consider this
Packed bed reactor for oxidation of glucose
In order to improve the performance of three dimensional electrodes for synthesis of electroorganic compound, investigations have been carried out in a packed bed reactor of flow-by configuration with batch recirculation system. This paper also deals with some aspects of modelling for such an investigation
Role of short range interactions in the charge of maximum adsorption
Adsorption of solvent or organic compounds at a metal/interface is characterized by a
wide spectrum of interactions governing the phenomenon under effective fields of order
≈ 107 V/cm. A generalized spin-1 Ising Hamiltonian was formulated by considering various
interactions under molecular field approximation (MFA) to arrive at a three-state
model of adsorption isotherm (i.e. the joint adsorption of two different organic compounds
in the presence of solvent molecules). A general multi-state model was deduced
heuristically and an expression for the charge (σM
max) at which maximum adsorption
(θmax) occurs derived explicitly for a three-state site parity model that incorporates
short-range interaction energies, functional dependence of permanent and induced dipole
moments of the organic adsorbate, and the solvent and substrate interactions
Electrochemical oxidation as a tool for pollution control - Part IV: Studies on double packed bed reactor for the destruction of cyanide
Linear sweep voltammetric simulation of monolayer formation-I absorption, nucleation-growth-overlap and combined models with uniform surface sites
A generalised overview of the linear sweep voltammetric (LSV) simulation of adsorption model (AM) and
nucleation-growth-overlap model [NGOM) is presented, along with the numerical simulation of LSV
response for the combined model. The numerical simulation indicates that separate voltammetric peaks
may not be obtained if the surface sites are uniform and no heterogeneity effects are introduced by the
surface coverage. However, some specific features of th surface coverage may be used to distinguish this
model from AM to NGOM. These aspects are discussed in detai
Electrochemical reduction of Cr6+ to Cr3+ using packed bed electrolysers
Hexavalenl chorrnium in the effluent from plating/metal fin~shing industries llas been known to be the
major toxic pollutant, which necessitates removal-ot the same as a measure of environmental pollul~on
control. Treatment of such effluent has been mainly or~entedto wards reduct~ono f cr6' lo cr3+f ollowed
by removal of the same by prec~pitat~oTnh.e present paper deals w ~ t hth e investtgatrons carried out in a
packed bed reactor of flow-by confi ?u ration on electrochemical reduct~ono f ~ r "lo ~ r "st arting w~tha n in~tiacl oncentration of 200 ppm Cr + and at pH 1.5 and f l o ~ra tes rangrng lrom 6 lo 15 IVhr. It has been
observed that 100% conversion could be achieved by electrolysis
Direct Oxidation of Dimethylsulphoxide and Reduction of Maleic Acid in Methanesulphonic Acid Medium
The direct electro oxidation of dimethylsulphoxide (DMSO) to dimethylsulphone
(DMSO2) at a Pb/PbO2 anode and electro reduction of maleic acid (MA)
to succinic acid (SA) at stainless steel cathode have been has been carried out in
methane sulphonic acid (MSA) medium in a batch divided cell. It is to be noted
that, as methane sulphonic acid medium (MAS) is biodegradable, it is a preferred
medium for the electrochemical reactions.
The process parameters such as concentration of MSA, DMSO and current density
have been critically examined and the comparative performances of Pb/PbO2
with TSIA electrode as well as the reusing of electrolyte under optimum conditions
have been investigated. The reaction parameters such as acid concentration,
current density, the use of divided and undivided cells, etc. have been studied on
electrochemical reduction of MA to SA.
In the case of direct electro oxidation of dimethylsulphoxide to dimethylsulphone,
the current efficiency on TSIA anode has been around 60- 65% while that with
Pb/PbO2 has been more than 90%. The electro reduction of MA to SA has given
current efficiency around 65 – 70%. Based on the result obtained on trials, the
optimum parameters of the reaction found to be 1.0 M acid concentration and 5.0
A dm−2 current density. Divided cell has given good results when compared to
undivided cell
Investigations on electrochemical reduction of hexavalent chromium in industrial effluents
Chromium is a potential pollutant in industrial waste waters discharged in both hexavalent as well as
trivalent forms. To safeguard the environmental conditions against such toxic pollutants has become a
statutory obligation for the industries.
With a view to develop an electrochemical method, experiments were carried out using potassium
dichromate plus H2S04 as electrolyle keeping the initial concentration of cr6+ at 200 ppm. The reduction
was carrid out in a divided cell with sintered WC as diaphragm using graphite electrodes. The current
density was varied from 0.8 to 10Aldm2 and the concentration of unreduced cr6+ was determined
spectrophotometrically using diphenyl carbazide method as per ISS 2488 (Parl 11) 1968.
It was obsewed that the reduction of cr6+to cr3+o ccurs with 40-50%current efficiency at an optimum
current density of 5-10Aldm2. The concentration of hexavalent chromium could be brought down by
electrolys~sfr om an initial value of 200 to zero pp
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