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Register a new userEvaluation of Some Migration Parameters Between the Virgin Olive Oil and the High Density Polyethylene
تقييم إمكانية حدوث هجرة متبادلة بين زيت الزيتون البكر و البولي إيثيلين عالي الكثافة
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Damascus University ورقة بحثية
Publication date
2012
fields
Food Sciences
and research's language is
العربية
Authors
نبيل بطي( باحث )
Created by
Shamra Editor
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هدفَ البحث إلى كشف احتمال حدوث هجرة متعاكسة بين المواد المضافة إلى البولي إيثيلـين عـالي الكثافة المستخدم في صناعة عبوات تعبئة زيت الزيتون البكر و الزيت المعبـأ، و قـد صـممت التجربـة بالاعتماد على حبيبات البولي إيثيلين من جهة للحصول على أعلى سطح تماس ممكن بزيـت الزيتـون، و باستخدام نوعين منها أحدها أبيض اللون و الثاني أحمر، كما درس تأثير كل من زمـن التمـاس بـين الحبيبات و الزيت و زمن تخزين الزيت من جهة أخرى. و لتحديد ما يجري فعلاً عند تخـزين الزيـت فـي العبوات البلاستيكية بأبسط الطرائق، درس كل من رقم الحموضة، و رقم البيروكسيد، و لزوجـة الزيـت، و كشف وجود مركبات الدايينات المهاجرة على موجة امتصاص UV)232nm) ، فضلاً عن دراسة العـد الكلي للأحياء الدقيقة (لكشف احتمال وجود مثبطات نمو)، و الاختبارات الحسية. كما قيست إمكانية حدوث هجرة للزيت إلى حبيبات البولي إيثيلين.
No English abstract
References used
AOCS Cd3D-63 (1990), Free Fatty Acid Evaluation, Official Methods and Recommended Practices of the AOCS, 6th Edition, 2nd printing
AOCS Cd3D-62 (1990). Peroxide Value Evaluation, Official Methods and Recommended Practices of the AOCS, 6th Edition, 2nd printing
ISO 2555, (1989 E), Determination of apparent viscosity by the Brookfield Test Method
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The study was conducted on randomized samples of virgin olive oils
collected from Hama, Aleppo, Daraa, Latakia, Homs and Idleb to investigate
the relationship between the quality indices of oil purity (peroxide value, the
figure iodine, coefficien
t of acidity, the absorption coefficient qualitative Xultraviolet
K270 and distributed fatty acids) and related volatile flavor
components compared with what is published in the literature. The results also
showed that the quality indices of Hama and Lattakia، s samples in terms of
extra virgin olive oil and the first class of virgin olive oil were not compatible
with the Syrian Standards and metrology (2000/182) while the concentrations
of fatty acids for samples of Idleb, Homs, Latakia, Deraa and Aleppo were
within the scope of Syrian standard. However, their distribution in Hama
samples did not comply with the ratios set forth in the Syrian specifications.
Forty three volatile compounds were isolated and they correspond with what is
published. The samples of research showed somewhat of similarity to a large
extent with the exception of a sample of Hama, where a decline was observed in
the content of volatile flavored materials. It was noticed that the essential
composition of volatile compounds of the samples was aldehydes followed by
ester of fatty acids and then hydrocarbons. The study showed that the
technique used in this research was fast and efficient in extraction and
identification of volatile compounds.
The aim of this research is to study the absorptive effect of high density (HDPE) polyethylene pipes for the hydrocarbon compounds on the characteristic (Force, Elongation) curves. To verify this, we immerse some parts of the pipe in different hydroc
arbon mediums containing gasoline, diesel, and motor oils of (10 and 40) calibre. The result show that these compounds have a bad effect on the submission force, neck formation, and damage force. The experimental results also show that motor (engine) oils have a similar effect on gasoline despite low absorption percentages.
The aim of this work is to study the rheological and mechanical properties of Poly(lactic acid) and High density polyethylene and blends (PLA/HDPE) in the molten state with recpect to shear stress, temperature and blends compositions using brabender mixer.
The objective of this research was to identify the potentials of Syrian olive
oil exports through studying the current situation of the Syrian olive oil in the
world and local markets and the most important factors effecting its
competitiveness ca
pabilities in the world markets. This study was built on
analyzing the primary data obtained from the delivered questionnaires,
searches lists and personal interviews with the exporting and manufacturing
companies (30 companies) of Syrian olive oil. Some of the economic indicators
were calculated to determine the competiveness status in the import markets.
Results indicated that the Syrian olive oil exports had suffered from low
competitiveness indicators of production which was 0.12 in the most important
import markets for the studied period. In addition, the increased pricing levels
compared with other competitors in the same markets had reached an average
of 3083.98 dollars per ton representing 106% of world export price, high
production costs, the reduction of the market penetration rate related to Syrian
olive oil exports in the most important markets amounted to about 0.245 during
the second period of the study. The low value of the dependence on export
indicator compared with the competitive countries where Syria occupied the
seventh place .This means that Syria doesn’t have a good export efficiency, lack
of marketing researches on the foreign markets, the absence of promotional
programs the restrictions applied by the European Union on the exports of
Syrian olive oil, lack of access to all distribution outlets due to the dependence
of the exported companies on the exclusive agents in the process of distribution
and marketing. The results had recommended that the establishment of a
comprehensive database and accurate studies is very necessary for the Syrian
exported products, in addition to detailed studies about the major and
promising markets to Syrian olive oil exports, iImproving the Syrian business
environment to encourage the foreign direct investment to support the
competitiveness of Syrian olive oil exports.
Some kinetic parameters have been determined in this work for thermal and catalytic
cracking of the mixed of polyethylene and polypropylene using batch method. The
cracking reaction was carried out at different temperature 470,490 and 510oC under
atmospheric pressure. The mass of products (liquid and gas fractions) were determined and
used to plot the curves of the thermal and catalytic decomposition. We used two types of
catalysts: Syrian natural Zeolite and the same after loading with sulfate ions using
impregnation method. The thermal cracking has a long time and has firs-pseud order
reaction. While in the case of catalytic process we note that the reaction finished in the
short time and the process is the Zero-pseud order reaction. The rate of the cracking
increased very much, the rate constant was k1=0.0032.min-1 in the thermal cracking at
4700C and ko=0.111.min-1 in the case of catalytic cracking in presence of Z catalyst and
ko= 0.206 min-1 in presence of 15-SO4
2-/Z as catalytic at the same temperature. In the other
hand activation energy was 208.7 kj/mol in the thermal process and decreased to 116.6
kj/mol at Z catalytic presence and to 87.3 kj/mol at 15-SO4
2-/Z catalytic presence.
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