Dencs B.

University of Pannonia, Veszprém

Environmentally friendly, biodegradable biopolymers can be prepared via the chemical modification of starch. These biopolymers are able to partially or totally substitute synthetic additives used today in the chemical or environmental technologies. Through the building of ionic function groups into polymeric chains of the starch ion exchangers, flo...

A nionic flocculants were produced by solid-phase chemical modification of starch. On the basis of their favourable properties (non-toxic, environmentally degradable), their application is very advantageous in drinking water treatment, food industry and pharmaceutical industry for removing colloid size particles from suspensions. A pilot scale plan...

A continuously operating modified Cuette-type shearing device has been developed for in-situ measurements to estimate the average particle size during size enlargement processes in fluidized bed granulator. It was proven by experiments that well-defined correlation exists between the mean torque and the average particle size being in the device. DE...

The paper reports the results obtained on the applicability of cross-sectional digital imaging method to study particle flow characteristics in 3D particle beds forced to move by gravity or shear. X-ray CT imaging technique is widely used in medical diagnostics and, during the last decades, its spatial and temporal resolution has been improved sign...

The fluidized bed process presented in this paper is suitable for recovery of solids from solutions in form of granules. The solution is sprayed into the bed and as solvent evaporates, solid material is deposited on the surface of fluidizing particles. During this process, particle growth takes place by surface layering and/or agglomeration. A spec...

The fluidized bed process presented in this paper is suitable for recovery of solids from solutions in form of granules. During the process, particle growth takes place by surface layering and/or agglomeration. The most important task is to control the particle size in the fluidized bed. A special grinder is used at the bottom of the fluidized bed...

The fluidized bed process presented in this paper is suitable for recovery of solids from solutions in the form of granules. The solution is sprayed into the bed and as solvent evaporates, solid material is deposited on the surface of fluidizing particles. During this process, particle growth takes place by surface layering and/or agglomeration. A...

The paper was geared towards extracting information on the granule size and size distribution from the power spectra of the measured torque and/or normal stresses in the powder. Two kinds of granulation were studied: a fluid bed granulator and high-shear mixer granulator.

The average local velocity of the upward of particles motion was determined in a dense fluidized bed by the means of a fibre optical probe. The probe consists of two independent light gates. The particles passing in front of the light gates reflect the light, generating sign sequences that are analysed by computer. From the average time difference...

A continuously operated fluidized bed drier equipped with grinding rolls is suitable for the partial dehydration of copper(II)sulphate pentahydrate and iron(II)sulphate heptahydrate. The product thus obtained is small sized, dry and of appropriate copper(II) and iron(II) content, respectively. Using the grinding rolls, this yields a stable steady p...

The mechanism of particle formation from solutions in a fluidized bed is discussed and information relating to particle size changes and the bringing about of steady-state conditions is presented. The experimental apparatus and methods are shown, followed by the results obtained with different model materials with and without solid material additio...

This paper is a continuation of Paper I in which the mechanism of particle formation from solution in a gas fluidized bed is examined.The technological parameters of the process are here detailed. Experiments were carried out using different chemical model compounds in a continuous fluidization apparatus under steady-state operation, which was achi...

The experiments on dehydration of low-melting-point crystalline hydrates were carried out in a continuously operated fluidized bed. The results are summarized and evaluated.

Fluidized-bed processes are capable of producing continuously solid granular materials from a fluid phase (solution, suspension, paste, or a melt). Recent developments in continuous fluidization technology prove the widespread demand for fluidization processes in chemical industry. Mathematical modeling of such processes, based on the characteristi...

The paper reports the recent results obtained on the applicability of cross-sectional digital imaging method to study particle flow characteristics in 3D particle beds forced to move by gravity or shear. X-ray CT imaging technique is widely used in medical diagnostics and, during the last decades, its spatial and temporal resolution has been improv...

The fluidized bed process presented in this paper is suitable to recover solids from solution in form of granules. Solution is sprayed into the bed and, as the solvent evaporates, solid material is deposited on the surface of fluidizing particles. During this process, particle growth takes place by surface layering and/or agglomeration. A special g...

Experimental batch type reactor of 100 kg/charge was constructed for making solid phase reactions. The reactor is a horizontal cylinder equipped with impeller and chopper to perform the proper motion and prevent the agglomeration of fine solid materials. Spraying nozzle is used to distribute the dissolved component. The reactor has heating jacket w...