Volume 14, No. 1 (2013)

REGENERATION OF AMMONIA SOLUTION FOR CO2 CAPTURE IN POSTCOMBUSTION

CAROL TORO, CHAKIB BOUALLOU*

This study investigated enthalpy of solutions and solubility for a NH3/CO2 system. Measurements were performed in a thermoregulated Lewis-type cell reactor, temperatures ranging from 278 to 303 K and mass concentrations from 2 wt% to 5 wt%. Enthalpies of solution of CO2 and solubility have been obtained as function of loading, α (moles CO2/mol NH3). Results show that ammonia solutions concentrations of 3 and 5 wt% promote the formation of ammonium bicarbonate. Beside, ammonia concentration of 2 wt% promotes the formation of ammonium carbonate. Therefore, to use ammonia concentrations of 3 and 5 wt% need less energy that a concentration of 2 wt% to reverse the reaction. Regeneration system was simulated using Aspen plus™ software for a pulverised coal fired power plant (CF) in a post-combustion process. Model analysis established that NH3 heat duty is lower than MEA and MDEA ones. The energy consumption reaches 2.83 GJ•t-1 CO2. Regarding heat duty and ammonia losses, 3 wt% NH3 is the suitable concentration to capture CO2.

CHEMICAL COMPOSITION AND ANTIBACTERIAL PROPERTIES OF ESSENTIAL OILS OF Pimpinella Anisum L. GROWING IN MOROCCO AND YEMEN

A. AL MAOFARI(1), S. EL HAJJAJI(1)*, A. DEBBAB(2), S.ZAYDOUN(1), B. OUAKI(5), R. CHAROF(4), Z. MENNANE(4), A. HAKIKI(3), M. MOSADDAK(3)

We report in this study the chemical composition and antibacterial activities of the seed’s essential oils of Pimpinella anisum L. collected from Morocco and Yemen. The hydro-distillation technique was used to extract their essential oils, followed by continuous liquid-liquid fractionation using water and ethyl acetate as solvent system. Obtained essential oils were analyzed by gas chromatography (GC) and gas chromatography-mass spectroscopy (GC-MS). GC and GC/MS results showed that 4-allylanisole was the major compound of Pimpinella anisum L. with percentages of 76.70 and 85.28% of Moroccan and Yemen, respectively, in addition to other minor compounds such as limonene (9.75% for Moroccan species and 5.53% for Yemen species) and fenchone (6.16% for Moroccan species and 4.12% for Yemen species). Furthermore, both essential oils were evaluated for their antibacterial activity against a panel of pathogenic microorganisms. The results showed that both essential oils inhibit most pathogenic bacteria tested.

COMPARATIVE STUDY ON THE CONSERVATION OF NUTRITIONAL ELEMENTS OF PEAS FOR STORAGE AND FOOD PROCESSING I. NUTRITIONAL CHARACTERIZATION

CAMELIA VIZIREANU*, FELICIA DIMA, MARIA GARNAI

In the modern food grains are nominated as the main sources of soluble fiber in time that vegetables are the main sources of insoluble fiber, among which are the peas. The Romanian market has been flooded with a wide range of plant products frozen or preserved by sterilizing, whose culinary use is growing. But the quality of these products has decreased, the material may be affected by the storage modules to suppliers or customers and product type. Our study followed the evolution of the nutritional characteristics of three varieties of peas grown in the Galati region subjected to freezing or sterilization, and their behavior during food processing.

QUALITY CONTROL OF SOME TRADITIONAL MEAT PRODUCTS

S. DOBRINAS, A. SOCEANU*, V. POPESCU, G. STANCIU, S. SULIMAN

In this paper, we present the characterization of six traditional meat products: smoked file, smoked bacon, pork sausages, sausage prepared from swine’s entrails, pork pastrami, sheep sausages. Organoleptic tests (the aspect and shape, the aspect of freshly cut in the section, smell, taste and consistency), physico-chemical and microbiological determinations (NTG, Salmonella, Listeria monocytogenes and Escherichia coli) were performed. These analyzes are a part of quality control that must be done in order to obtain a certificate from the Ministry of Agriculture for a traditional product. After identification of H2S and starch and according to fat oxidation degree it was concluded that analyzed samples didn’t contain counterfeiters and all parameters analyzed are within the maximum limits allowed by law. Considering all the procedures for manufacturing, characteristics of raw and auxiliary materials, organoleptic properties of final products analyzed in this study, it can be concluded that analyzed meat specialties meet the requirements of Ministry Order no. 690/28.09.2004 for the traditional products certification.

ELABORATION OF ORGANIC-INORGANIC HYBRID MATERIALS OBTAINED BY CHEMICAL REACTION OF POLYMETHYLHYDROSILOXANE AND BI-FUNCTIONAL HETEROCYCLIC MOLECULES

TAOUFIK HELLALI, AFIFA HAFIDH*, NEJI GHARBI, RIDHA KOSSAI

New organic-inorganic hybrid materials G1-G5 were obtained by chemical reaction of polymethylhydrosiloxane (PMHS) and bi-functional heterocyclic molecules under 2:1 stoechiometry, in tetrahydrofurane as solvant, using hexachloroplatinic acid (H2PtCl2, 6H2O) as catalyst at 60 °C. This reaction leads to the formation of transparent and monolithic gels. The xerogels have been caracterized by infrared, 29Si and 13C CP MAS NMR spectroscopy. The results show the formation of Si–N; Si – O; Si – S bridges in produced xerogels. The thermal analysis of the xerogels was determined by TGA and DTA. Xerogels morphology and texture of the obtained materials were studied by scanning electron microscopy (SEM) and Brunauer – Emmet – Teller method (BET).

Me4PhPO3HSnCl4 AND (Me4N)2PhPO3SnBr4: SYNTHESIS AND INFRARED STUDY

HASSAN ALLOUCH, LIBASSE DIOP*

The title adducts have been obtained on allowing Me4NPh2PO2 to react in specific ratios with SnX4 (X = Cl, Br). The infrared data allow to suggest an infinite chain structure, the anion behaving as a bridging ligand, the environment around tin IV being octahedral. In Me4NPhPO3H.SnX4 (X = Cl, Br) when the anion is involved through OH.....O or/and OH.....X hydrogen bonds a supramolecular architecture is obtained.

2(Cy2NH2)2SO4Sn(SO4)2Cy2NH2Cl AND 2(Cy2NH2)2SO4Sn(SO4)22Cy2NH2Cl: SYNTHESIS AND INFRARED STUDY

DAOUDA NDOYE, LIBASSE DIOP*

2(Cy2NH2)2SO4Sn(SO4)2Cy2NH2Cl and 2(Cy2NH2)2SO4. Sn(SO4)22Cy2NH2Cl complexes have been obtained on allowing Cy2NH2O2C-SO3H and Cy2NH2HSO4 to react respectively with SnBu2Cl2 and SnBu3Cl in specific ratios.The molecular structures of these compounds have been determined on the basis of the infrared data. The suggested structures are dimeric, the tin atom being octacoordinated by four chelating sulfate anions, the monomeric basic entities being connected by hydrogen bonded cation chloride cation strings.