desulfurization study of gas oil is very important, in
order to reduce the resulted pollution from acidic gas SO2, which
results by burning the fuel, and to prevent poisoning of sensitive
catalysts with sulfur, in subsequent processes, and to prev
ent
corrosion of engines and equipment in refineries. So, refineries
have been restricted by very low sulfur content, in their products.
Because the hydrodesulphurization did not demonstrate good
efficiency in reducing the sulfur and aromatics content to the
required limits, it has been to search for alternative or completed
methods for it .One of these processes is the oxidation –extraction
method, which has been studied in our work. We used hydrogen
peroxide as oxidant, and acetonitrile as extraction solvent. We
studied Operation conditions in terms the proportion of oxidant and
extraction solvent to fuel, and we chose the operation temperatures
to suit the specifications of the oxidant and extraction solvent. We
studied diesel specifications, which we applied at it the process of
oxidation and extraction.
لقد تم تحضير وتوصيف خمسة حفازات من نوع V-MCM-41 مختلفة عن بعضها في كمية الفناديوم وقد تبين أن الفناديوم موجود في بنية الحفاز
This study was conducted to study the effect of including
different levels of Grape seed oil as a natural antioxidant on
layer hen egg production, egg quality,.
Soft wheat is a good source of Phytic acid. The objective of this
work was to develop wheat phytic acid extraction and purification
techniques.
Classified locality Yeasts have been culturing in plantology
department at the Faculty of Science-University of Damascus,
from genera of Pichia, Candida, Geotrichum, Rhodotorula, Phaffia
on solid Czhapek agar medium, and after incubated in appropr
iate
conditions their colonies showed evidence of different colors to
produce a variety of pigments. Then it cultured in liquid Czhapek
medium to increase biomass and the genera producing
endocellular pigment separated from the medium by filtration with
added ethanol on them and blasting cells by ultrasonic waves to
get a pigment, while the genera producing exocellular pigment is
separated about the liquid medium also by filtration but the solvent
was added to the medium containing the pigment.
Paper mill wastewater is an environment contaminated wastewater , and refractory to biological treatment due to its high value of COD and low value of BOD_5.
This research studies the treatment of mentioned wastewater using Fenton Oxidation Fe^(2+)/
H_2 O_2. The effect of some key elements on this oxidation such as H_2 O_2 and Fe^(2+) doses, dosage strategy of H_2 O_2, with a pH value near 3 was studied. Fenton method showed high efficiency of COD removal reached 78.5 % with a total hydrogen peroxide dose of 2.2g/l applied in four doses and intervals of 15min.
Experiments also proved that intermittent dosage - four doses - are better than giving whole dose in one stroke. Results appeared evidently in two points: the efficiency of COD removal and the ratio of BOD5/COD; since we reached through intermittent dosages a value of BOD5/COD near 0.32 , which eventually allows effluent from Fenton oxidation process to be treated biologically.
تعتبر اضطرابات أكسدة الاحماض الدسمة مجموعة من اضطرابات الاستقلاب الوسيط الموروثة حيث تنتقل بوراثة صبغية جسدية متنحية مسببة طيفاً واسعاً من التظاهرات السريرية التي تحمل مخاطر عالية من المراضة والوفيات لدى الولدان والاطفال المصابين
Antimicrobial compounds have been used for decades in poultry diets to increase
performance and decrease morbidity particularly in broiler chickens. However, consumer
pressure related to the potential development of antibiotic-resistant bacteria ha
s resulted in
the development of non-antibiotic feed additives that may also improve broiler erformance.
In recent years, aromatic plants and their extracts have received attention as growth and
health promoters. Such products have several advantages over commonly used commercial
antibiotics since they are residue free and they are also, generally recognized as safe and
commonly used items in the food industry. The antimicrobial properties of medical plants
and their extracts have been widely reported because they consist of many active
ompounds such as carvacrol, eugenol,which partition lipids in the bacterial cell wall and
mitochondria, disturbing the structures and rendering them more permeable.
Generally,medical plants are slightly more active against Gram-positive than Gramnegative
bacteria. Medical plants are well known for their antioxidant activity and show a
considerable effect on increasing the antioxidant capacity of chicken meat because they
consist of many of active compounds such as tocopherol, carvacrol. Spices or their active
principles have been reported to stimulate digestive secretions such as lipase, amylase and
proteases.because they consist of many active compounds such as anothol, eugenol.
Variable effects of medical plants and their extracts on the productive performance of
broiler have been reported. The majority of experimental results indicate improved body
weight gain or final body weight and feed conversion ratio.
In this research, the total content of phenols and flavonoids was determined from the peels of some Syrian citrus fruits and the total antioxidant activity of them was studied, and the effect of changing the extraction method on this activity and content was studied.
The aim of this research, is to use Liquid–liquid extraction to separate
phenolic compounds from olive mill wastewater resulted from three-phase
centerfuge extraction (OMWW). Four solvents were used: Methyl iso butyl
ketone (MIBK), Ethyl acetate (
EtOAc), Octanol-1 (C8H18O), and Noctanoylpyrrolidine
(OPOD) which was synthesized in our lab. The effects of
pH and Extraction stages on the efficiency of total phenolic compound
extracted from OMWW were determined by Folin - Ciocalteu
spectrophotometric method. Ferulic acid (FA) and Caffeic acid (CA) were
determined in extractants by HPLC. The COD value in water phase of the four
extracts was measured together with the reducing power and radicalscavenging
effects for the extracts. We compared the antioxidant activity of
MIBK, OPOD extracts, with ferulic acid (FA), caffeic acid (CA), ascorbic acid
standards and rosemary.
The results showed that MIBK had the highest extraction efficiency and
gave the maximum quantity of phenols from OMWW, than OPOD, C8H18O,
EtOAc. The COD value was decreased about %94.5 by MIBK, %83.7 by
OPOD,%81 by C8H18O, and%72 by EtOAc. The phenols extracted by MIBK
could be added to eatable oils as natural antioxidants, because they were
superiority on rosemary, and nearly to caffeic acid (CA) standard.
