published by "GHEORGHE ASACHI" TECHNICAL UNIVERSITY of Iaşi
Secţia CHIMIE şi INGINERIE CHIMICĂ
abridged as Bul. Inst. Polit. Iaşi
THE BULLETIN OF THE POLYTECHNIC INSTITUTE FROM IAŞI
CHEMISTRY and CHEMICAL ENGINEERING Section
ISSN: 2537 - 2947
ISSN-L: 0254 - 7104
Contents
pages 1- 8
Potential Atimicrobial Activity of Some New Compounds Against Pathogenic Strains
pages 9 - 15
ANCA MIHAELA MOCANU, “Gheorghe Asachi” Technical University of Iași, “Cristofor Simionescu” Faculty of Chemical Engineering and Environmental Protection, ancamocanu@ch.tuiasi.ro
Abstract:
The objective of this study is to evaluate antibacterial activity of
new compounds obtained by the condensation of hydrazides with
several substrata (aldehides, transition metals and coupling
compounds) affording final compounds with potential biological
activities such antibacterial, antifungal, antiviral, antitumor
activity, fungicidal, tuberculostatic and plant growth regulative
properties. The new compounds were studied for antibacterial
activities, in vitro, by measuring zone diameters of bacterial
growth inhibition on different types of strains microorganisms:
Escherichia coli, Staphylococcus aureus and
Pseudomonas aeruginosa. The newly analyzed compounds exhibited
a variable activity of inhibition on the growth of the bacteria.
Keywords: hydrazide, coupling compounds, microorganisms, difusimetric method, tested activity.
Applications of Reaction Calorimetry in Lignin Chemistry
pages 17 - 22
VALENTINA IORDAN (CONSTANTIN), “Gheorghe Asachi”
Technical University of Iași, “Cristofor Simionescu” Faculty of
Chemical Engineering and Environmental Protection
TEODOR MĂLUȚAN, “Gheorghe Asachi” Technical
University of Iași, “Cristofor Simionescu” Faculty of Chemical
Engineering and Environmental Protection,
thmalu@tuiasi.ro
Abstract
The thermodynamic properties of lignin and its solutions are
important in the design and operation of the machines used in the
biomass biorafination schemes. In the literature, there are few
thermodynamic data on the main chemical components of biomass
(cellulose, hemicellulose and lignin). In this paper we present the
heat dissolution (ΔHdis) of the lignin alkaline solutions obtained
by the reaction calorimetry. Lignin is characterized by insolubility
in most simple solvents. The solubility of lignin preparations also
depends on the method used to isolate them.
Since most of the applications in which lignin is subjected to
chemical reactions involves the dissolution of lignin, it is very
important to know the thermodynamic properties of these solutions as
well as the characterization of chemical reactions in terms of heat
of reaction
Keywords: lignin; reaction heat; dissolving heat; specific heat; biomass.
Experimental Equipment Used in the Study of Carbon Dioxide Absorption (I)
pages 23 - 33
RAMONA ELENA TĂTARU FĂRMUȘ, Gheorghe Asachi”
Technical University of Iași, “Cristofor Simionescu” Faculty of
Chemical Engineering and Environmental Protection,
rtataru@ch.tuiasi.ro
MARIA HARJA, “Gheorghe Asachi” Technical University
of Iași, “Cristofor Simionescu” Faculty of Chemical Engineering and
Environmental Protection
Abstract
The continuing increase demand in global energy has led a faster raw
material depletion and increased exploitation of hydrocarbon fuels.
Before using natural gas, it is necessary to remove acid gases (H2S
and CO2), to increase the heating value of natural gas, reduce
corrosion, prevent atmospheric pollution. Acid gas removal is best
accomplished by chemical absorption. Such washing processes are also
used in petroleum refining, coal gasification and hydrogen
production. This paper presents a brief chronology of experiments
conducted in the study of carbon dioxide absorption in amine
solutions, focusing on experimental equipment developed in
laboratory research
Keywords: acid gases; carbon dioxide; experimental devices; flow of absorption.
Microcrystalline Cellulose as Adsorbent for Removal of Dyes from Wastewaters
pages 35 - 44
IULIA NICA, “Gheorghe Asachi” Technical University
of Iași, “Cristofor Simionescu” Faculty of Chemical Engineering and
Environmental Protection
GABRIELA BILIUȚĂ, “Petru Poni” Institute of
Macromolecular Chemistry of Romanian Academy, Iași
SERGIU COȘERI, “Petru Poni” Institute of
Macromolecular Chemistry of Romanian Academy, Iași
CARMEN ZAHARIA, “Gheorghe Asachi” Technical
University of Iași, “Cristofor Simionescu” Faculty of Chemical
Engineering and Environmental Protection
DANIELA ȘUTEU, “Gheorghe Asachi” Technical
University of Iași, “Cristofor Simionescu” Faculty of Chemical
Engineering and Environmental Protection,
danasuteu67@yahoo.com
Abstract
Batch adsorption studies were carried out for the adsorption of some
dyes (Brilliant Red HE-3B, Orange 16, Rhodamine B and Methylene
Blue) onto a new versatile cellulose-based product (Cellet), to be a
new adsorbent. Studies were shown that the adsorption process is
influenced by the chemical structure of dyes and experimental
working conditions, i.e. pH, initial dye concentration,
cellulose dose, phases contact time and temperature. The obtained
results were shown that this cellulose-based product (Cellet) can be
use as an adequate adsorbent in discoloration of textile effluents.
Keywords: adsorption; aqueous medium; microcrystalline cellulose; organic dye.
Influence of Natural Extracts on the Quality of Cold Sodium Soap
pages 45 - 52
CLAUDIA COBZARU, “Gheorghe Asachi” Technical
University of Iași, “Cristofor Simionescu” Faculty of Chemical
Engineering and Environmental Protection
CRINA CALENCIUC, “Gheorghe Asachi” Technical
University of Iași, “Cristofor Simionescu” Faculty of Chemical
Engineering and Environmental Protection
ADRIANA GHEORGHINA, “Gheorghe Asachi” Technical
University of Iași, “Cristofor Simionescu” Faculty of Chemical
Engineering and Environmental Protection
CORINA CERNĂTESCU, “Gheorghe Asachi” Technical University
of Iași, “Cristofor Simionescu” Faculty of Chemical Engineering and
Environmental Protection,
ccernatescu@yahoo.com
Abstract
In this study, toilet soaps containing a mixture of natural fruit
and vegetable extracts were prepared. The results show that the
three vegetable oils (olive, palm and coconut oil) used as a source
of fatty acids, due to their acidity index, iodine and
saponification index, are a good raw material for making soap.
Furthermore, they contain vitamins and antioxidants, which, together
with those contained in the natural extracts mixture obtained from
fruits and vegetables, helps to improve the softening and soothing
properties of the soap. However, anthocyanin pigments from the
natural extracts do not contribute to the colour enhancement of the
finished product due to the colour change based on the pH value for
the alkaline solution or the soap (neutral pH). For all that
reasons, the soap obtained is a quality product because it does not
have alkali, and because the glycerine content helps with
moisturizing and softening the skin.
Keywords: soap; natural extracts; cold saponification
Habilitation thesis summary:
Advanced Capitalization of the Fly Ash to Obtain New
Materials
pages 53 - 57
MARIA HARJA, “Gheorghe Asachi” Technical University of Iaşi, “Cristofor Simionescu” Faculty of Chemical Engineering and Environmental Protection, mharja@ch.tuiasi.ro
Abstract
The habilitation thesis presents the original and relevant results
in the field of capitalization of fly ash, with application in
chemical engineering. In this thesis new synthesized low-cost
sorbents, based on Holboca ash, were comparative studied for the
removal of heavy metals from aqueous solutions. The synthesis method
was very simple under room temperature to high conditions and final
product can be safely disposed. The ashes are produced in power
plants and represent the largest source of energy. The production of
this material (the by-product) is estimated to be more than 370 Mt
last years. Ash can be modified and used as sorbent efficient for
the removal of heavy metals and dyes from solutions. The modified
ash has composition similar to natural zeolites. The ash and
modified ash present low cost and efficiently adsorbents, which can
be used for removal pollutants from water, gas and soil.
