Chemical and Process Engineering

article

Precipitation of Chevreul's salt from CuSO4 solutions with Na2SO3

M. Yesilyurt, T. Calban

Chemical and Process Engineering > 2007 > Vol. 28, z. 1 > 85-91

Chevreul's salt, Cu2SO3.CuSO3.2h2O has been precipitated from CuSO4 solutions by means of Na2 SO3; its appropriate precipitation conditions have been determined. The investigated parameters for precipitating the Chevreul.s salt are pH - 3, [SO[2-]3 / [Cu[2+] ratio - 1.6, reaction temperature . 60 [degrees]C, stirring speed - 500 rpm and reaction time - 20 min. The precipitate obtained at these conditions...

article

The Stefan diffusion problem

A. Burghardt

Chemical and Process Engineering > 2007 > Vol. 28, z. 1 > 2-16

The classical solution of the Stefan diffusion is based on the "plausible intuitive hypothesis" (Wilke, 1950) which assumes the stagnancy of the inert component (NB = 0). The considerations performed in this study as well as the review of the main publications concerning the Stefan diffusion lead to an explicit conclusion that the principal phenomena underlying the Stefan diffusion are the...

article

Study of water treatment by an integrated coagulation-ultrafiltration process

M. Kabsch, K. Majewska, T. Winnicki

Chemical and Process Engineering > 2007 > Vol. 28, z. 1 > 67-74

Some aspects of natural organic matter retention in integrated membrane process combining coagulation and ultrafiltration are discussed. The process was performed in an in-line mode, i.e. water after coagulation, without sedimentation step underwent ultrafiltration. The use of alum or polyaluminium chloride as a coagulant significantly improved the performance of UF membranes. The increase of NOM...

article

Outflow conditions and strains on internals during pressure relief events on distillation columns. Experimental investigation and dynamic simulation

D. Staak, J. Repke, G. Wozny

Chemical and Process Engineering > 2007 > Vol. 28, z. 1 > 33-45

A rigorous dynamic distillation column model is presented, describing emergency pressure relief events. To consider the relevant aspect of a possible two-phase flow relief, the model includes transient level swell calculation and a two-phase flow calculation method of the pressure relief valve (PRV). A measurement technique based on strain gauges for investigation of strains on internals during a...

article

Modular investment cost estimate of multipurpose chemical plant

Ł. Hady

Chemical and Process Engineering > 2007 > Vol. 28, z. 1 > 17-31

The estimation of investment cost by using of modular technique is a new approach for determination of investment capital for the industrial plants. Modular estimation of investment cost covered in this paper lets a planner determine the investment cost of multipurpose chemical plant in project phases and in the dependence on complexity level of a plant. The new systematic enables early-stage decisions...

article

Optimization of hydrogen volumetric storage capacity for microporous carbon materials

B. Buczek, L. Czepirski, J. Ziętkiewicz

Chemical and Process Engineering > 2007 > Vol. 28, z. 1 > 47-55

The concept of adsorptive of hydrogen storage at reduced pressure was analyzed. The method of improving hydrogen storage capacity has been proposed. Active carbons seem to be a suitable medium for the storage of hydrogen. The volumetric hydrogen uptake, the bulk and particle densities of adsorbent, as well as the operating conditions become important factors influencing the storage density. The results...

article

Phase equilibrium behaviour of volatile organic compounds in complex hydrocarbon mixtures

D. Richter

Chemical and Process Engineering > 2007 > Vol. 28, z. 1 > 115-126

The phase equilibrium behaviour of volatile organic as well as overcritical components in coal tar oil as solvent during the coke oven gas purification process is analysed. Caused by the lack of experimental data in the literature and the complexity of the washing fluid, the results are compared to various predictive gE models and equations of state in order to proof the accuracy of these approaches.

article

Mechanically activated limestone sorbents

A. Szymanek, W. Nowak

Chemical and Process Engineering > 2007 > Vol. 28, z. 1 > 127-137

The method is presented for the improvement of the sorption properties of calcium carbonate in dry combustion-gas desulfurization. The principle of mechanical activation is discussed and the equipment for carrying out activation is presented with the results of laboratory tests. In addition, the results from the first industrial mechanical activation of the installation operating at the Turów Power...

article

Influence of bubble nucleation on the pressure relief of non-reactive three-phase systems

M. Poli, J. Steinbach

Chemical and Process Engineering > 2007 > Vol. 28, z. 1 > 139-147

Based on past research, the influence on the pressure relief under various boundary conditions in two- and three-phase systems was determined using a reference system (ideal glass beads and water). The aim of this work was to gain a deeper knowledge on the influence of certain solid properties on the three-phase pressure relief system consisting of solid, liquid and vapour.

article

Modelling and simulation of start-up strategies for batch extractive distillation

J. Repke

Chemical and Process Engineering > 2007 > Vol. 28, z. 1 > 149-160

Different start-up strategies for batch extractive distillation were developed and investigated using rigorous simulations. For this purpose a detailed dynamic model is developed that takes into account a cold and empty column as an initial condition. The developed strategies consider also the variation in beginning of entrainer supply for several start-up procedures (start-up operation cases).

article

Heat transfer from a pc processor to an air-cooled heat sink

M. Lemanowicz, J. Wójcik

Chemical and Process Engineering > 2007 > Vol. 28, z. 1 > 57-66

Heat transfer from PC processors to radial heat sinks cooled by air has been examined. The dimensionless equations derived could be used for the prediction of the heat transfer coefficient for the system. The influence of processor temperature on the operation of the fan is demonstrated.

article

CFD modelling of a fluidized-bed crystallizer

J. Wójcik, R. Plewik

Chemical and Process Engineering > 2007 > Vol. 28, z. 1 > 75-83

The hydrodynamics in fluidized-bed crystallizers is studied by the CFD methods for the first time.

article

Agitation of gas-liquid systems. Scale-up effects on the process characteristics

J. Karcz, R. Adamiak, A. Kiełbus

Chemical and Process Engineering > 2007 > Vol. 28, z. 1 > 93-113

The possibility of prediction of the gas hold-up for mechanically agitated gas-liquid systems from a theoretical equation proposed by Kudrewizki [3] has been analyzed in the paper. The calculations have been carried out for coalescing and non-coalescing systems, agitated in the vessel of the inner diameter D equal to 0.634 m and equipped with a Smith impeller or a turbine with flat blades. The results...

article

Viscoelastic properties of corn starch pastes with selected non-starch hydrocolloids

P. Ptaszek, M. Grzesik

Chemical and Process Engineering > 2007 > Vol. 28, z. 2 > 323-334

The aim of the study was to determine the viscoelastic properties of the model mixtures of the selected pasted polysaccharides. The initial material was water pastes of corn starch (SK), mixed with guar gum (GG), carboxymethylcellulose (CMC) and xanthan gum (GK). Rheological tests were performed in time domain. Theoretical analysis covered adaptation of some elements of phenomenological theory of...

article

Synthesis of diisobutyl phthalate coupled with pervaporation process on hydrophilic silica membranes

Z. Ziobrowski

Chemical and Process Engineering > 2007 > Vol. 28, z. 2 > 211-220

Application of pervaporation process on silica hydrophilic membranes with the reaction of synthesis of diisobutyl phthalate ester has been investigated. The experimental study on reaction kinetics and pervaporation process were performed. The mathematical model describing the integrated process (reaction and pervaporation) was formulated. Several computer simulations were performed in order to compare...

article

Neural network representation of multicomponent vapour-liquid equilibria

J. Dudczak

Chemical and Process Engineering > 2007 > Vol. 28, z. 2 > 165-175

The use of thermodynamic models of vapour-liquid equilibrium (VLE) to obtain data necessary in simulation, design and controlling of distillation equipment is very often associated with significant computational effort. Artificial neural networks, widely known for their excellent approximating capabilities, have been successfully used in recent years as an alternative way of VLE data prediction in...

article

Performance of a tubular fuel cell with internal methane reforming

M. Karcz

Chemical and Process Engineering > 2007 > Vol. 28, z. 2 > 307-321

The numerical model of a solid oxide fuel cell fuelled with methane via an internal reforming is presented in the paper. The model has been implemented into the commercial CFD code. The basic model for fuel cell fed with humidified hydrogen has been extended to cope with mixture of hydrogen, carbon monoxide and methane as a fuel. Numerical calculations have been performed to predict the tubular fuel...

article

Simulation analysis of zinc distribution in the water system of an integrated steel plant

C. Kozik

Chemical and Process Engineering > 2007 > Vol. 28, z. 2 > 245-258

Because of the excessive accumulation of zinc in the water system of one of the integrated steel plants, analysis of the said factor distribution in water circuits and final water treatment plant with different options of supply and desalting has been carried out. A method of computer simulation of salinity balance was utilized based on the previously developed software Visual Woda (VA) adjusted to...

article

Pilot combustion experiment of sewage sludge and hard coal

P. Kolat

Chemical and Process Engineering > 2007 > Vol. 28, z. 2 > 293-305

Thermal usage of mechanically drained stabilized sludge from the sewage plants in the boiler with circulated fluid layer has been investigated. The paper describes the thermal analysis of coal, sewage sludge and its mixtures, mud transport to the fluid boiler, effects on efficiency, operational reliability of the combustion equipment, emissions and solid combustion residues.

article

Distribution of trace elements at bituminous coal and lignite combustion at circulating fluidised-bed power stations

L. Bartonova

Chemical and Process Engineering > 2007 > Vol. 28, z. 2 > 273-292

The paper is focused on study of the redistribution of trace elements between bottom ash, fly ash and emissions at two Czech fluidised-bed power stations, where bituminous coal and lignite were combusted at two boiler outputs. Theoretically calculated amounts of the elements released into atmosphere were compared with emission limits.

INFONA - science communication portal

Chemical and Process Engineering

Precipitation of Chevreul's salt from CuSO4 solutions with Na2SO3

The Stefan diffusion problem

Study of water treatment by an integrated coagulation-ultrafiltration process

Outflow conditions and strains on internals during pressure relief events on distillation columns. Experimental investigation and dynamic simulation

Modular investment cost estimate of multipurpose chemical plant

Optimization of hydrogen volumetric storage capacity for microporous carbon materials

Phase equilibrium behaviour of volatile organic compounds in complex hydrocarbon mixtures

Mechanically activated limestone sorbents

Influence of bubble nucleation on the pressure relief of non-reactive three-phase systems

Modelling and simulation of start-up strategies for batch extractive distillation

Heat transfer from a pc processor to an air-cooled heat sink

CFD modelling of a fluidized-bed crystallizer

Agitation of gas-liquid systems. Scale-up effects on the process characteristics

Viscoelastic properties of corn starch pastes with selected non-starch hydrocolloids

Synthesis of diisobutyl phthalate coupled with pervaporation process on hydrophilic silica membranes

Neural network representation of multicomponent vapour-liquid equilibria

Performance of a tubular fuel cell with internal methane reforming

Simulation analysis of zinc distribution in the water system of an integrated steel plant

Pilot combustion experiment of sewage sludge and hard coal

Distribution of trace elements at bituminous coal and lignite combustion at circulating fluidised-bed power stations

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