242
Xulosa:
Euphorbiaceae oilasi o‘simliklarining poya, barg va guli tarkibini
birmuncha chuqurroq o‘rgangan holda, ularning tarkibidagi polifenollarning xilma-
xilligi, xususiyatlari va ular yordamida yangi bakteriya va viruslarga qarshi samarali
vosita sifatida yangi biotexnologik namuna ishlab chiqarish ko’zda tutilmoqda.
Foydalanilgan adabiyotlar roʻyxati:
1.
Mustafakulov M.A., Toshbekov N.T. Euphorbiaceae oilasiga mansub
o’simliklarning virusga va bakteriyalarga qarshi vositalar ishlab chiqarish //Zamonaviy
Innovatsion tadqiqotlarning dolzarb muammolari va rivojlanish tendensiyalari:. –
2023.C – 2-qism. 100-101.
2.
Mukhammadjon M. et al. The effect of ngf on indicators of the antioxidant
system in rat brain tissue //Universum: химия и биология. – 2021. – №. 9 (87). – С.
82-86.
3.
Saatov T. et al. Antioxidant and hypoglycemic effects of gossitan
//Endocrine Abstracts. – Bioscientifica, 2019. – Т. 63.
4.
Saatov T. et al. Study on hypoglycemic effect of polyphenolic compounds
isolated from the Euphorbia L. plants growing in uzbekistan //Endocrine Abstracts. –
Bioscientifica, 2020. – Т. 70.
5.
Saatov T. et al. Correction of oxidative stress in experimental diabetes
mellitus by means of natural antioxidants //Endocrine Abstracts. – Bioscientifica, 2021.
– Т. 73.
6.
Irgasheva S. et al. Study on compositions of lipids in tissues of rats with
alimentary obesity //Endocrine Abstracts. – Bioscientifica, 2019. – Т. 63.
7.
Mamadalieva N. I., Mustafakulov M. A., Saatov T. S. The effect of nerve
growth factor on indicators of the antioxidant system in rat brain tissue //eurasian union
of scientists. series: medical, biological and chemical sciences Учредители: ООО"
Логика+". – 2021. – №. 11. – С. 36-40.
8.
Saatov T. et al. Study on antioxidant and hypoglycemic effects of natural
polyphenols in the experimental diabetes model //Endocrine Abstracts. –
Bioscientifica, 2018. – Т. 56.
9.
Mustafakulov M. et al. Determination of antioxidant properties of l-cysteine
in the liver of alloxan diabetes model rats //International Journal of Contemporary
Scientific and Technical Research. – 2023. – №. Special Issue. – С. 47-54.
10.
Мамадалиева Н. И., Мустафакулов М. А., Саатов Т. С. Влияние фактора
нервного роста на показатели антиоксидантной системы в тканях мозга крысы
//Environmental Science. – 2021. – Т. 723. – С. 022021.
243
ANALYSIS OF THE MAIN HYDRODYNAMIC REGULARITIES OF THE
MICROBURNINGPROCESS IN ORDER TO IDENTIFY THE
POSSIBILITIES OF USING BIOGAS FROM CO
2
Abdulazizov A.А.,
Tojiboyev U.
Fergana politechnic institute
Annotation
: This article presents the results of a study of the main
hydrodynamic and mass transfer characteristics of a microbubble apparatus on model
systems aimed at elucidating the possibility of using microbubble processes to conduct
mass transfer processes between biogas and liquid.
Key words
: micro bubbling, hydrocarbons, perfluorocarbon, mass transfer,
mass transfer. The mechanism of microbubble formation and the characteristics of
membranes used for the micro bubbling process.
To date, the process of membrane gas dispersion is mainly carried out on porous
glass or ceramic membranes. The main characteristics of the membrane, which should
be taken into account when studying the process of microburning, are the type and
structure of the surface, porosity, as well as the shape and distribution of pore sizes.
These characteristics depend both on the size of the microbubbles formed, and on the
pressure and gas content in the membrane contactor [1].
The process of obtaining microbubbles with glass membranes is considered in
the works [2]. In these works, porous glass membranes of a special composition, the
so-called SPG membranes, were used. As a starting material for the production of the
SPG membrane, a mixture Na
2
CO
3
, CaCO
3
, MgO, H
3
BО
3
, As well as a mixture of
Shirasu, which is the source SiО
2
and A1
2
О
3
. This mixture is melted at 1623 K for 3
hours. After cooling down to 1473 K a glass matrix is formed, consisting of Na
2
O —
CaO — MgO — B
2
О
3
A1
2
0
3
— SiО
2
, which is given the desired shape - flat or tubular.
Then, the samples are heat treated at 933-953 K for 20 hours. During this
process, the phase separation of the homogeneous glass matrix into two phases occurs
- one containing acid soluble oxides Na20 — CaO — MgO — B203, other insoluble
A12О3— SiО2. Next, the divided glass matrix is processed 0,5M solution of
hydrochloric acid. As a result of the dissolution of oxides Na
2
О — CaO — MgO —
B
2
О
3
a porous membrane structure is formed, the size of the resulting pores being
dependent on the heat treatment conditions [3].
A detailed description of the manufacturing process of SPG membranes can be
found in.
As can be seen from the figures, SPG-membranes have sinuous cylindrical pores
that form a three-dimensional working structure.
The porosity of such membranes is quite high and lies in the range 0.56-0.58,
regardless of the pore size. The contact angle of the surface of the membrane with
water is 230 - 270 , which corresponds to the hydrophilic surface. It can also be noted
that on the surface of such membranes there are practically no ridges of roughness
(which is explained by the method of their manufacture).
244
a)
b)
a) membrane with a pore size of 3 b) a membrane with a pore size Of
Figure 1a - Porous structure of glass SPG membranes
Figure 1b - shows the surface images of glass SPG membranes.
An important feature of SPG membranes is the narrow distribution of their pores
in size. Thus, in Figure 2 (a), the integral curves of the pore size distribution for
membranes with an average pore diameter of 43, 55, 64 and 85 nm are presented [4].
It can be seen that for all membranes the spread of pore diameters is about ± 20 nm.
Figure 2 (b) shows the differential pore size distribution curve for a membrane with an
average pore size of 3 um (a photograph of the surface of this membrane is presented
in Figure 1 (a)). Here, one can also see a rather narrow distribution of the pore sizes-a
spread of diameters of ± 1 gm. As noted in [14-16], the size of the bubbles produced
during microbubbotation strongly depends on the distribution of pore sizes. Thus, in
[5], the dependence of the diameters of the microbubbles formed on the diameter of
the membrane pores was studied. As the liquid phase, 0.3 wt. % solution of sodium
dodecyl sulfate, the flow rate of which in the membrane tube was 0.7 m/s.
a) Integral distribution curves for membranes with an average pore size of (a) 43 nm,
(b) 55 nm, (c) 64 nm, (d) 85 nm;
b) differential distribution curve for a membrane with an average pore size of 3 gm.
245
It was found that under these conditions, the size of the microbubbles formed
linearly depends on the pore size and for all cases is approximately 8.6 times greater
than the mean diameter of the membrane pores. This is also confirmed by the results
of. The dependence obtained in.
Reference:
1. Biogas plants in Europe // A practical handbook.-Springer, 2007. - 361 p.
2. BarbaraEder, HeinzSchulz. BiogasPraxis /переводнарус // Биогазовые
установки:практическое пособие.-2006.-121р.
3. Дытнерский Ю.И., Брыков В.П., Каграманов Г.Г. Мембранное
разделение газов. - М.: Химия, 1991. –344 с.
4. ChristensenТ.,ChristensenТ.Н., CossuR, Stegmann R. Landfilling of Waste //
Biogas (Hardcover). -Publisher:Taylor&Francis; 1st ed edition, 1996.-840p.
5. Concise Encyclopedia of Bioresource Technology.-CRCPress, 2004.-735р.
СОВРЕМЕННЫЕ МЕТОДЫ ИНТЕНСИФИКАЦИИ ПРОЦЕССОВ
ГАЗОРАЗДЕЛЕНИЯ БИОГАЗА ОТ СЕРОВОДОРОДА И
ГАЛОГЕНОСОДЕРЖАЩИХ УГЛЕВОДОРОДОВ
А.О. Хошимов, Д.Д. Қурбонов
Ферганский политехнический институт
Аннотация:
В настоящей статье приводится результаты исследования
основных
гидродинамических
и
массообменных
характеристик
микробарботажного аппарата на модельных системах направленное на
выяснение возможности применения микробарботажных процессов для
проведения массообменных процессов между биогазом и жидкостью.
Ключевые слова:
микробарботаж, углеводороды,
перфторуглерод,
массоотдача, массоперенос.
При осуществлении процессов, в основе которых лежит контакт между
газом и жидкостью, одним из ключевых параметров является площадь
поверхности контакта взаимодействующих фаз. Во многих аппаратах
газожидкостного контакта, а именно в тарельчатых абсорберах и
ректификационных колоннах, газожидкостных реакторах, ферментерах,
взаимодействие между газовой и жидкой фазами осуществляется путем
барботажа газа через слой жидкости. В этом случае газ, с помощью различных
диспергирующих устройств, распределяется в жидкости в виде пузырьков,
которые и формируют поверхность контакта фаз. При этомвеличина
поверхности непосредственно зависит от размеров получаемых пузырьков – чем
меньший диаметр они имеют, тем больше величина поверхности раздела фаз
(при одинаковом газосодержании в барботажном слое). Диаметр пузырьков, в
свою очередь зависит от применяемого диспергирующего устройства. В
настоящее время в химической промышленности барботаж газа главным
