2017, Issue 63(67), Fasc. 1 (March)
Contents
pages 1- 8 Download
Leaching Kinetics of a Fluidized Bed with High Salt Concentration
MARCELA POPA, "Gheorghe Asachi" Technical University of
Iaşi, Faculty of Chemical Engineering and Environmental Protection
EUGENIA TEODORA IACOB-TUDOSE, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection
IOAN MĂMĂLIGĂ, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection, imamalig@tuiasi.ro
pages 9 - 21 Download
Abstract
The purpose of this study was to determine the mass transfer
coefficient in the extraction of a solute from a solid matrix by contacting
it with a solvent in a fluidized bed. The solvent used to remove the solute
is, at the same time, fluidizing agent. The results presented had been
obtained for the dissolution of a high concentration of a solute in the
solid phase by using the recirculating extraction fluid phase.
Keywords: mass transfer coefficients; solid-liquid extraction; fluidized
bed; extraction with fluid recirculation.
Characteristics of Oil Obtained from Grape Seeds Separated from Dried and Fresh Marc
CLAUDIA COBZARU, "Gheorghe Asachi" Technical University
of Iaşi, Faculty of Chemical Engineering and Environmental Protection
MIHAELA ALINA MATCABOJĂ (GHERASIM), "Gheorghe Asachi"
Technical University of Iaşi, Faculty of Chemical Engineering and
Environmental Protection
ADRIANA MARINOIU,
National R&D Institute for Cryogenics and Isotopic Technologies-ICIT,
Râmnicu Vâlcea
GABRIELA ANTOANETA APOSTOLESCU, "Gheorghe Asachi"
Technical University of Iaşi, Faculty of Chemical Engineering and
Environmental Protection
RAMONA ELENA TATARU FĂRMUȘ,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection
CORINA
CERNĂTESCU, "Gheorghe Asachi" Technical University of Iaşi, Faculty
of Chemical Engineering and Environmental Protection,
ccernatescu@yahoo.com
pages 23 - 28 Download
Abstract
In this study, oil was extracted from seeds separated from
dried and fresh marc, in controlled conditions, marc being a residue from
homemade wine manufacturing process. The organoleptic and physico-chemical
characteristics show that this oil belongs among vegetable food oils. Also,
marc, considered to be a waste product from wine manufacturing, can be an
alternative source for making edible oil.
Keywords: marc; oil; grape
seeds.
Studies on the Photocatalytic Decomposition of Organic Dyes Using Mesoporous Metal Oxides
NICOLAE APOSTOLESCU, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection
RAMONA ELENA TATARU FĂRMUȘ,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection
CORINA CERNĂTESCU,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection
CLAUDIA COBZARU, "Gheorghe Asachi" Technical University
of Iaşi, Faculty of Chemical Engineering and Environmental Protection
MIHAELA AURELIA VIZITIU, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection
GABRIELA ANTOANETA APOSTOLESCU,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection,
ganto@ch.tuiasi.ro
pages 29 - 37 Download
Abstract
In this study, the ultraviolet irradiation behaviour of three
dyes (methylene blue - MB, phenol red - FR and crystal violet - CV) is
presented in the presence of a mesoporous oxide material based on ZnO-CeO2.
The three dyes were degraded to the corresponding leucoderivates in
different times, methylene blue (conc. 10-5M) in 25 min, crystal violet
(conc. 2·10-5M) in 90 min, and phenol red (conc. 4.5·10-5M) in 140 min.
Also, the calculated photodegradation yield showed that MB and CV degraded
by 98% and RF only by 78%. It was also investigated the influence of the
photocatalyst concentration on the reaction rate for MB.
Keywords: crystal
violet; photodegradation; phenyl red; methylene blue.
Studies Regarding Au(III) Extraction in Aqueous Two Phase Systems Based on Polyethylen Glycol with Different Molecular Weights
MĂDĂLINA GHERCĂ, "Gheorghe Asachi" Technical University
of Iaşi, Faculty of Chemical Engineering and Environmental Protection
LAURA BULGARIU, "Gheorghe Asachi" Technical University of
Iaşi, Faculty of Chemical Engineering and Environmental Protection,
lbulg@ch.tuiasi.ro
pages 39 - 47 Download
Abstract
This study presents the efficiency of Au(III) ions extraction
in aqueous two phase systems (ATPS) based on polyethylene glycol (PEG) 40%
(w/w) and (NH4)2SO4 40% (w/w), in the presence of chloride ions with a
concentration of 0.5 mol/L as extracting agents and a pH of 4.5 of the
inorganic salt. The influence of two experimental parameters was studied:
PEG molecular weight and volume ratio between the two phases. Experimental
results showed that with the increasing of the PEG molecular weight the
quantity of Au(III) ions extracted in PEG rich phase increases (67.78% for
PEG(2000), 75% for PEG(4000) and 86.19% for PEG(6000), values obtained for a
volume ratio (NH4)2SO4 : PEG of 5:4). Also, the extraction efficiency showed
an important decrease for a (NH4)2SO4 : PEG volume ratio >2 because of the
hydrophobicity of the environment that decreases.
Keywords: Au(III) ions
extraction; aqueous two phase systems; PEG; green chemistry.
Polyphenolic Content Evaluation in Branches of Rosa Canina L. and Hippophae Rhamnoides L. Species
OANA TEODORA CIUPERCĂ, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection, Research and Processing Centre for Medicinal Plants
"Plantavorel" S.A., Piatra Neamț
CARMEN ELENA ȚEBRENCU,
Research and Processing Centre for Medicinal Plants "Plantavorel" S.A.,
Piatra Neamț
IRINA VOLF, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection, iwolf@ch.tuiasi.ro
pages 49 - 58 Download
Abstract
This study evaluated the branches of Rosa canina L.
and Hippophae rhamnoides L. in order to highlight new sources of
polyphenols, condensed tannins and flavonoids. The phytochemical screening
and ultraviolet-visible and Fourier transform infrared spectroscopy analysis
on biomass showed the presence of fine chemical constituents like
polyphenols, flavonoids (rutin) and condensed tannins (catechin,
epicatechin). The biomass has been evaluated to quantify the total
polyphenols (gallic acid) and tannins (tannic acid) by instrumental methods
(UV-VIS spectrometry). The results showed that the branches of R. canina
contain polyphenols (1.77±0.067%g gallic acid equivalent/g) and tannins
(1.45±0.029%g tannic acid equivalent/g), whilst the branches of H.
Rhamnoides are somewhat richer (1.87±0.058%g gallic acid equivalent/g
and 1.94±0.038%g tannic acid equivalent/g). These results open perspectives
for advanced valorization of R. canina and H. rhamnoides
branches, already known only for phytotherapeutical and nutritional
potential of their fruits.
Keywords: Rosa canina; Hippophae
rhamnoides; branches; polyphenols; tannins; phytochemical screening.
Magnetic Activated Carbon Composites Used as Fenton Like Catalysts for Photodegrading Organic Compounds in Aqueous Solutions
ANDREEA VAJDA, "Gheorghe Asachi" Technical University
of Iaşi, Faculty of Chemical Engineering and Environmental Protection
MARIUS SEBASTIAN SECULA, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection,
mariussecula@ch.tuiasi.ro
LAURA HAGIU-ZALESCHI, "Gheorghe Asachi" Technical
University of Iaşi, Faculty of Chemical Engineering and Environmental
Protection
GABRIELA
CARJA, "Gheorghe Asachi" Technical University of Iaşi, Faculty of
Chemical Engineering and Environmental Protection
IOAN MĂMĂLIGĂ,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection
pages 59 - 65 Download
Abstract
The main goal of the present work consists in investigating
the performance of several magnetic activated carbon composites towards the
photo-Fenton degradation of Ibuprofen molecule. Three Granular Activated
Carbon (GAC) matrices having different pHPZC were employed to prepare the
magnetic GACs using the co-precipitation method. UV light irradiation tests
were carried out to determine the performance of the prepared magnetic
composites towards the degradation of Ibuprofen molecule in aqueous solution
in the presence of Hydrogen Peroxide. The photo-Fenton tests were conducted
after the adsorption equilibrium has been established. The magnetic GAC
composites prepared with acid-surfaced matrix L27 GAC was found to enhance
significantly the degradation process of Ibuprofen molecule.
Keywords:
Magnetic composites; photocatalysis; Fenton reaction; Ibuprofen;
micropollutant
Modelling the Free Radical Polymerization of Styrene Using Artificial Neural Networks
LUCIANA GHIBA, "Gheorghe Asachi" Technical University of Iaşi, Faculty
of Chemical Engineering and Environmental Protection
ELENA-NICULINA DRĂGOI,
"Gheorghe Asachi" Technical University of Iaşi, Faculty of Chemical
Engineering and Environmental Protection
SILVIA CURTEANU,
"Gheorghe
Asachi" Technical University of Iaşi, Faculty of Chemical Engineering and
Environmental Protection,
scurtean@tuiasi.ro
pages 67 - 81 Download
Abstract
In this work, the modeling of free radical polymerization of
styrene is performed using two approaches: phenomenological and empirical.
In the last case, artificial neural networks are used, applying two working
strategies. First, a single model with three outputs (monomer conversion,
numerical molecular weight and gravimetrical molecular weights) based on
time, temperature and initial concentration of the initiator (model inputs)
was determined. Due to the unacceptable performance results for the
molecular weights, a second strategy is developed, modelling each output,
separately, as function of the three inputs. Different artificial neural
network topologies were tested, the two hidden layer networks performing the
best for all the outputs.
Keywords: styrene; modelling; prediction;
artificial neural networks.