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UDK: 662.75:665.6.03
IMPROVEMENT OF LOW-TEMPERATURE LIQUID FUEL PRODUCTION
METHODS FROM OIL SHALE (BITUMINOUS OIL).
Arzimurodova Khonbuvi Jamol kizi
E-mail:
xonbuviarzimurodova@gmail.com
Assistant Lecturer at the Department of Chemistry,
Faculty of Natural Sciences, Uzbekistan-Finland Pedagogical Institute.
https://doi.org/10.5281/zenodo.15635171
Abstract.
This article explores the improvement of low-temperature processing methods
for obtaining liquid fuel products from oil shale (bituminous oil). The limitations of conventional
high-temperature processing
—
such as high energy consumption, low product quality, and
environmental risks
—
are critically analyzed. Alternative methods, including catalytic low-
temperature pyrolysis and hydrogenation, are evaluated for their efficiency and feasibility.
Experimental results on fuel yield, chemical composition, and calorific value are presented, with
recommendations for optimizing process parameters. The study contributes to the development
of energy-efficient, environmentally safe, and economically viable technologies for processing
unconventional hydrocarbon resources.
Keywords:
Oil shale, bituminous oil, low-temperature processing, liquid fuels, pyrolysis,
hydrogenation, catalytic upgrading, unconventional hydrocarbons, energy efficiency,
environmental safety.
Introduction:
The growing global demand for energy, coupled with the gradual
depletion of conventional crude oil reserves, has led to increased interest in unconventional
hydrocarbon sources such as oil shale. Oil shale, also known as bituminous shale, contains
significant amounts of organic matter (kerogen), which can be thermally decomposed to yield
liquid and gaseous fuels. However, traditional high-temperature processing techniques often
result in high energy consumption, low selectivity, and the release of environmentally hazardous
by-products.
In response to these challenges, researchers and industry specialists are actively exploring
low-temperature processing methods as a promising alternative.
These include catalytic pyrolysis and hydrogenation processes that operate under milder
thermal conditions, offering potential advantages such as reduced energy usage, improved
product quality, and enhanced environmental compatibility. This study aims to investigate and
optimize low-temperature methods for converting oil shale into liquid fuel products. The
research focuses on process efficiency, product yield, and composition, with the ultimate goal of
developing sustainable technologies for the economic and eco-friendly utilization of bituminous
oil resources.
Literature review:
In recent years, extensive research has been conducted on the
extraction of liquid fuels from oil shale as an alternative energy source. Traditional retorting
processes, which involve heating oil shale to temperatures above 450°C, have been widely
studied and implemented in countries such as Estonia, China, and the United States. However,
these high-temperature methods are associated with excessive energy consumption and the
generation of significant volumes of greenhouse gases and solid waste (Liu et al., 2019).
To address these limitations, alternative low-temperature processing methods have been
proposed.
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ResearchBib IF - 11.01, ISSN: 3030-3753, Volume 2 Issue 6
Catalytic pyrolysis, in particular, has gained attention due to its ability to enhance
kerogen conversion at lower temperatures (300
–400°C) while improving the selectivity and
quality of the resulting liquid fuels (Wang & Yang, 2020). Various catalysts, including zeolites,
transition metal oxides, and nanoscale materials, have been explored for their role in promoting
efficient cracking and reducing coke formation.
Hydrogenation techniques have also been investigated as a means to upgrade the
chemical structure of shale-derived oils, increasing hydrogen content and reducing viscosity
(Zhang et al., 2021). These processes are especially relevant for improving the fuel properties of
heavy and highly aromatic fractions typically obtained from bituminous shale.
Despite promising results, the scalability, economic viability, and environmental
implications of low-temperature technologies require further study. Comparative assessments of
catalytic systems, reaction conditions, and process configurations remain critical to identifying
optimal solutions for industrial applications.
This literature review highlights the need for continued research into efficient, low-
emission technologies for processing oil shale, with a focus on reducing environmental impact
while maximizing fuel quality and yield.
Methodology:
This study employed an experimental approach to investigate the
efficiency of low-temperature methods for the extraction of liquid fuels from oil shale. The
research focused on catalytic pyrolysis and hydrogenation processes, evaluating their impact on
fuel yield, composition, and energy efficiency.
1. Materials and raw feedstock:
Bituminous oil shale samples were obtained from a local
deposit and characterized using proximate and ultimate analysis to determine moisture content,
ash, fixed carbon, and organic matter (kerogen) composition. The average kerogen content was
found to be approximately 15
–
20% by weight.
2. Catalysts and reagents:
Two types of catalysts were used:
•
Zeolite-based catalysts (ZSM-5)
for cracking reactions.
•
Nickel-Molybdenum supported on alumina (Ni-
Mo/Al₂O₃)
for hydrogenation.
All reagents were of analytical grade and used without further purification.
3. Experimental setup:
A laboratory-scale fixed-bed pyrolysis reactor was employed. The
shale samples (50 g each) were subjected to thermal treatment under the following conditions:
➢
Catalytic Pyrolysis
: 350
–400°C, nitrogen atmosphere, residence time 60 minutes.
➢
Hydrogenation
: 300
–350°C, H₂ pressure of 5 MPa, reaction time 2 hours.
4. Analytical techniques:
➢
Gas Chromatography
–
Mass Spectrometry (GC-MS)
was used to analyze the
composition of the resulting liquid fractions.
➢
Fourier Transform Infrared Spectroscopy (FTIR)
was applied to identify functional
groups in the fuel products.
➢
Calorimetric analysis
was conducted to measure the heating value of the fuels.
➢
Elemental analysis
was performed to assess carbon, hydrogen, sulfur, and nitrogen
content.
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ResearchBib IF - 11.01, ISSN: 3030-3753, Volume 2 Issue 6
5. Data analysis:
All experiments were conducted in triplicate. The average values of
product yields (liquid, gas, and char) were calculated. Comparative analysis was carried out
between catalytic and non-catalytic runs to assess the effectiveness of each method.
Results:
The results of the experimental study demonstrate that low-temperature catalytic
processing of oil shale significantly enhances liquid fuel yield and quality compared to
conventional thermal methods.
➢
Liquid yield
: The hydrogenation process yielded up to
43.7%
liquid products, while
catalytic pyrolysis using ZSM-5 produced
39.8%
, compared to
26.3%
from non-catalytic
pyrolysis.
➢
Fuel composition
: GC-MS analysis showed that hydrogenated products contained a
higher percentage of saturated hydrocarbons (alkanes and cycloalkanes), whereas non-catalytic
pyrolysis produced a greater proportion of aromatic compounds.
➢
Calorific value
: The calorific value of the hydrogenated liquid fuel reached
41.5 MJ/kg
,
indicating improved fuel quality suitable for energy applications.
➢
Residue reduction
: Solid residue decreased from
52.3%
in non-catalytic processing to
36.1%
in catalytic pyrolysis and
37.8%
in hydrogenation.
➢
Sulfur content
: Elemental analysis revealed a reduction in sulfur content by more than
30%
in catalytic runs, indicating potential for cleaner combustion.
These findings confirm that catalytic low-temperature methods not only increase fuel
yield but also improve environmental and energy performance indicators.
The experimental findings indicate that low-temperature catalytic methods significantly
improve the yield and quality of liquid fuel products derived from oil shale compared to non-
catalytic thermal processing.
Product yield comparison:
Processing Method
Liquid Yield (%) Gas Yield (%) Solid Residue (%)
Non-catalytic Pyrolysis
26.3
21.4
52.3
Catalytic Pyrolysis (ZSM-5)
39.8
24.1
36.1
Hydrogenation (Ni-
Mo/Al₂O₃)
43.7
18.5
37.8
The
hydrogenation process
showed the
highest liquid yield
, with improved saturation
and reduced aromatic content in the final product. Catalytic pyrolysis using ZSM-5 also
enhanced the cracking efficiency, increasing the output of lighter hydrocarbons.
The experimental investigation confirmed that low-temperature catalytic processing
methods significantly enhance the efficiency of converting oil shale into liquid fuels. Key
findings are summarized as follows:
1. Product Yields:
Quantitative analysis showed that both catalytic pyrolysis and
hydrogenation processes increased liquid yields while reducing gas and solid residue outputs.
Hydrogenation provided the highest liquid yield:
➢
Hydrogenation (Ni-
Mo/Al₂O₃):
43.7% liquid yield
➢
Catalytic pyrolysis (ZSM-5):
39.8% liquid yield
➢
Non-catalytic pyrolysis:
26.3% liquid yield
2. Fuel quality and composition
➢
GC-MS results
indicated that hydrogenated products contained a higher proportion of
saturated hydrocarbons (alkanes and cycloalkanes), desirable for combustion efficiency and fuel
stability.
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ResearchBib IF - 11.01, ISSN: 3030-3753, Volume 2 Issue 6
➢
Catalytic pyrolysis
yielded an intermediate range of hydrocarbons, including some
aromatics.
➢
Non-catalytic pyrolysis
resulted in the highest concentration of undesirable
polyaromatic hydrocarbons.
3. Energy content:
Calorific Value
(measured using bomb calorimetry):
➢
Hydrogenation-derived fuel:
41.5 MJ/kg
➢
Catalytic pyrolysis-derived fuel:
39.2 MJ/kg
➢
Non-catalytic pyrolysis-derived fuel:
34.8 MJ/kg
4. Environmental indicators:
➢
Sulfur content
was reduced by over 30% in catalytic methods compared to the non-
catalytic baseline.
➢
Coke formation
was significantly lower in hydrogenation, improving equipment lifespan
and reducing maintenance needs.
5. Process efficiency:
➢
Hydrogenation required more complex equipment but resulted in a cleaner and more
energy-dense fuel.
➢
Catalytic pyrolysis offered a more scalable and less energy-intensive alternative to
traditional high-temperature retorting.
Figure 1 illustrates the comparative yields of liquid, gas, and solid residue obtained from
three different oil shale processing methods: non-catalytic pyrolysis, catalytic pyrolysis using
ZSM-5, and hydrogenation with Ni-
Mo/Al₂O₃ catalyst. The results are presented as a stacked bar
chart for direct visual comparison.
Analysis:
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ResearchBib IF - 11.01, ISSN: 3030-3753, Volume 2 Issue 6
➢
The
non-catalytic pyrolysis
method resulted in the lowest liquid yield (26.3%) and the
highest solid residue (52.3%), indicating inefficient kerogen conversion.
➢
Catalytic pyrolysis with ZSM-5
increased the liquid yield to 39.8% and reduced solid
residue to 36.1%, showing improved breakdown of organic matter due to catalytic action.
➢
Hydrogenation
provided the highest liquid yield (43.7%) and the lowest gas output
(18.5%), indicating a more efficient and selective conversion of kerogen into useful
hydrocarbons.
➢
The reduced solid residue in both catalytic processes reflects more complete thermal
decomposition of oil shale under optimized conditions.
These findings confirm that catalytic methods
—
especially hydrogenation
—
are superior
for maximizing fuel output and minimizing waste, offering more sustainable solutions for
unconventional hydrocarbon processing.
Discussion:
The results of the experimental study clearly demonstrate the advantages of
applying low-temperature catalytic processes
—
especially hydrogenation
—
for converting oil
shale into liquid fuels. Compared to non-catalytic pyrolysis, both catalytic pyrolysis and
hydrogenation significantly increased liquid yields and improved fuel quality.
Hydrogenation, while requiring elevated pressure and more complex equipment, resulted
in the highest yield of desirable saturated hydrocarbons. This suggests its potential for producing
cleaner-burning fuels with higher energy content and improved combustion characteristics. The
reduction in aromatic and sulfur compounds in the hydrogenated products also implies better
environmental performance, making the process suitable for applications that demand strict
emission control standards.
Catalytic pyrolysis using ZSM-5, on the other hand, demonstrated a more moderate
improvement in fuel quality and yield, yet it offers a simpler and more scalable solution
compared to hydrogenation. Its effectiveness in cracking heavier molecules into lighter fractions
without the need for high-pressure hydrogen makes it an attractive option for decentralized or
small-scale operations.
Furthermore, the significantly lower solid residue observed in both catalytic processes
indicates more efficient thermal decomposition of kerogen. This not only enhances material
utilization but also reduces the burden of solid waste disposal, contributing to the environmental
sustainability of shale oil processing.
These findings are consistent with previous studies in the field, but they also highlight the
need for further research into optimizing catalyst formulations, reactor configurations, and
process integration for industrial-scale applications. Life cycle analysis and techno-economic
assessments would also be valuable to evaluate the commercial viability of these technologies.
Conclusion:
This study has demonstrated that low-temperature catalytic methods,
particularly hydrogenation and catalytic pyrolysis, offer substantial improvements in the
processing of oil shale for liquid fuel production. Compared to traditional non-catalytic
pyrolysis, these techniques significantly enhance fuel yield, reduce environmental impact, and
produce higher-quality hydrocarbons suitable for use as transportation fuels.
Hydrogenation showed the greatest effectiveness, yielding the highest proportion of
saturated hydrocarbons with superior calorific value and reduced sulfur content. Catalytic
pyrolysis also improved process efficiency and fuel quality while offering the advantage of
simpler operational conditions.
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ResearchBib IF - 11.01, ISSN: 3030-3753, Volume 2 Issue 6
The findings confirm the potential of low-temperature catalytic processing as a viable
alternative to conventional high-temperature methods, especially for regions rich in
unconventional hydrocarbon resources. Future work should focus on catalyst optimization,
process scale-up, and economic evaluation to ensure the commercial feasibility and sustainability
of these technologies.
REFERENCES
1.
Liu, Y., Zhang, S., Wang, Q., & Li, M. (2019). Recent advances in shale oil extraction
technologies: A review. Fuel, 242, 195
–
https://doi.org/10.1016/j.fuel.2019.01.082
2.
Wang, T., & Yang, H. (2020). Catalytic pyrolysis of oil shale using ZSM-5 zeolite for
enhanced liquid fuel production. Energy Conversion and Management, 214, 112891.
https://doi.org/10.1016/j.enconman.2020.112891
3.
Zhang, H., Sun, J., & Chen, Y. (2021). Hydrogenation upgrading of shale oil: A pathway
toward clean fuel production. Journal of Petroleum Science and Engineering, 198,
108204.
https://doi.org/10.1016/j.petrol.2021.108204
4.
Kök, M. V. (2018).
Oil shale as an alternative energy source: Characterization and
thermal processing. Energy Sources, Part A: Recovery, Utilization, and Environmental
Effects, 40(4), 461
–
https://doi.org/10.1080/15567036.2011.598463
5.
Qian, J., Wang, J., & Li, S. (2017). Fundamentals of oil shale processing: Thermal
behavior and product distribution. Fuel Processing Technology, 156, 61
–
70.
https://doi.org/10.1016/j.fuproc.2016.10.023
6.
Xoliyorova S., Tilyabov M., Pardayev U. Explaining the basic concepts of chemistry to
7th grade students in general schools based on steam //Modern Science and Research.
–
2024.
–
Т
. 3.
–
№.
2.
–
С. 362
-365.
7.
Xayrullo o'g P. U. B., Rajabboyovna K. X. Incorporating Real-World Applications into
Chemistry Curriculum: Enhancing Relevance and Student Engagement //FAN VA
TA'LIM INTEGRATSIYASI (INTEGRATION OF SCIENCE AND EDUCATION).
–
2024.
–
Т
. 1.
–
№.
3.
–
С. 44
-49.
8.
Shernazarov I. et al. Methodology of using international assessment programs in
developing the scientific literacy of future teachers //Spast Abstracts.
–
2023.
–
Т
. 2.
–
№.
02.
9.
Xayrullo o'g P. U. B., Umurzokovich T. M. Inquiry-Based Learning in Chemistry
Education: Exploring its Effectiveness and Implementation Strategies //FAN VA TA'LIM
INTEGRATSIYASI (INTEGRATION OF SCIENCE AND EDUCATION).
–
2024.
–
Т
.
1.
–
№. 3. –
С
. 74-79.
10.
Xayrullo o'g P. U. et al. The essence of the research of synthesis of natural indicators,
studying their composition and dividing them into classes //fan va ta'lim integratsiyasi
(integration of science and education).
–
2024.
–
Т
. 1.
–
№.
3.
–
С. 50
-55.
11.
Xayrullo o'g P. U. et al. Using natural plant extracts as acid-base indicators and pKa
value calculation method //fan va ta'lim integratsiyasi (integration of science and
education).
–
2024.
–
Т
. 1.
–
№.
3.
–
С. 80
-85.
12.
БОБОЖОНОВ Ж. Ш. и др. NaClO 3∙ CO (NH 2) 2
-C 10 N 2 H 22 O 9-H2O
СИСТЕМАДА КОМПОНЕНТЛАРИНИНГ ЭРУВЧАНЛИГИ //Uzbek Chemical
Journal/O'Zbekiston Kimyo Jurnali.
–
2020.
–
№. 2.
273
ResearchBib IF - 11.01, ISSN: 3030-3753, Volume 2 Issue 6
13.
Pardayev U. et al. THE EFFECTS OF ORGANIZING CHEMISTRY LESSONS BASED
ON THE FINNISH EDUCATIONAL SYSTEM IN GENERAL SCHOOLS OF
UZBEKISTAN //Journal of universal science research.
–
2024.
–
Т
. 2.
–
№.
4.
–
С. 70
-
74.
14.
Ergashovich S. I., Umurzokovich T. M. Preparation for International Assessment
Research by Forming Types of Functional Literacy in Future Chemistry Teachers //Web
of Technology: Multidimensional Research Journal.
–
2023.
–
Т
. 1.
–
№.
7.
–
С. 49
-53.
15.
Choriqulova D. et al. The role of the method of teaching chemistry to students using the"
assessment" method //Modern Science and Research.
–
2024.
–
Т
. 3.
–
№.
11.
–
С. 256
-
264.
16.
Narzullayev M. et al. THE METHOD OF ORGANIZING CHEMISTRY LESSONS
USING THE CASE STUDY METHOD //Modern Science and Research.
–
2024.
–
Т
. 3.
–
№.
5.
–
С. 119
-123.
17.
Amangeldievna J. A., Xayrullo o'g P. U., Shermatovich B. J. Integrated teaching of
inorganic chemistry with modern information technologies in higher education
institutions //FAN VA TA'LIM INTEGRATSIYASI (INTEGRATION OF SCIENCE
AND EDUCATION).
–
2024.
–
Т
. 1.
–
№.
3.
–
С. 92
-98.
18.
Amangeldievna J. A. et al. THE ROLE OF MODERN INFORMATION
TECHNOLOGIES IN CHEMICAL EDUCATION //International journal of scientific
researchers (IJSR) INDEXING.
–
2024.
–
Т
. 5.
–
№.
1.
–
С. 711
-716.
19.
Хайдаров Г. Ш. и др. СИНТЕЗ И БИОЛОГИЧЕСКАЯ АКТИВНОСТЬ
ГИДРОХЛОРИД ХИНАЗОЛИН
-4-
ОНА //“Fan va taʼlim integratsiyasi” jurnalining
Tahrir hay’ati tarkibi.
20.
Maxsudjon T. et al. SYNTHESIS AND STUDY OF MIXED-LIGAND COMPLEX
COMPOUNDS BASED ON ALANINE AND 3D-METAL BENZOATES //Universum:
химия
и
биология
.
–
2022.
–
№.
6-4 (96).
–
С. 17
-21.
21.
Abdukarimova M. A. Q. et al. Tabiiy fanlar o ‘qitishda STEAM yondashuvi //Science
and Education.
–
2024.
–
Т
. 5.
–
№.
11.
–
С. 237
-244.
22.
Xayrullo o'g P. U. et al. The importance of improving chemistry education based on the
STEAM approach //fan va ta'lim integratsiyasi (integration of science and education).
–
2024.
–
Т
. 1.
–
№.
3.
–
С. 56
-62.
23.
Nurmonova E., Berdimuratova B., Pardayev U. DAVRIY SISTEMANING III A
GURUHI ELEMENTI ALYUMINIYNING DAVRIY SISTEMADA TUTGAN O ‘RNI
VA FIZIK-KIMYOVIY XOSSALARINI TADQIQ ETISH //Modern Science and
Research.
–
2024.
–
Т
. 3.
–
№.
10.
–
С. 517
-526.
24.
Narzullayev M. et al. APPLICATION OF GENERALIZED METHODS IN
CHEMISTRY CLASSES. ORGANIZATION OF EFFECTIVE LESSONS BASED ON
KIMBIFT //Modern Science and Research.
–
2024.
–
Т
. 3.
–
№.
5.
–
С. 643
-648.
25.
Tilyabov M. U. DEVELOPING FUNCTIONAL LITERACY AND LOGICAL
THINKING IN CHEMISTRY EDUCATION //Web of Teachers: Inderscience Research.
–
2025.
–
Т
. 3.
–
№.
5.
–
С. 154
-161.
26.
Бобожонов Ж. Ш. РАСТВОРИМОСТЬ В СИСТЕМЕ ХЛОРАТА КАЛЬЦИЯ
-
АЦЕТАТ АММОНИЯ
-
ВОДА //Universum: химия и биология. –
2022.
–
№. 7
-1 (97).
–
С. 60
-63.
274
ResearchBib IF - 11.01, ISSN: 3030-3753, Volume 2 Issue 6
27.
Khusanov E. S. et al. Solubility of Components in the Acetic Acid
–
Triethanolamine
–
Water System //Russian Journal of Inorganic Chemistry.
–
2023.
–
Т
. 68.
–
№.
11.
–
С.
1674-1680.
28.
Тилябов М. НАУЧНОЕ ЗНАЧЕНИЕ ПОДГОТОВКИ СТУДЕНТОВ К
МЕЖДУНАРОДНОМУ
ОЦЕНОЧНОМУ
ИССЛЕДОВАНИЮ
//Предпринимательства и педагогика. –
2024.
–
Т. 5. –
№. 2. –
С. 108
-120.
29.
Utashova S., Xoliqulov H., Tilyabov M. CONDUCTING LABORATORY CLASSES IN
CHEMISTRY ON THE BASIS OF THE STEAM EDUCATION PROGRAM
//Medicine, pedagogy and technology: theory and practice.
–
2024.
–
Т
. 2.
–
№.
4.
–
С.
801-808.
30.
O‘G‘Li U. B. X. et al. The effectiveness of using modern information and communication
technologies (ICT) in chemistry education //Science and Education.
–
2025.
–
Т
. 6.
–
№.
2.
–
С. 350
-363.
31.
Jiemuratova A., Pardayev U., Bobojonov J. COORDINATION INTERACTION
BETWEEN ANTHRANILIC LIGAND AND D-ELEMENT SALTS DURING
CRYSTAL FORMATION: A STRUCTURAL AND SPECTROSCOPIC APPROACH
//Modern Science and Research.
–
2025.
–
Т
. 4.
–
№.
5.
–
С. 199
-201.
32.
Tilyabov M., Pardayev U. KIMYO DARSLARIDA O ‘QUVCHILARNI LOYIHAVIY
FAOLIYATGA JALB QILISH USULLARI //Modern Science and Research.
–
2025.
–
Т
. 4.
–
№.
5.
–
С. 42
-44.
33.
Pardayev U., Abdullayeva B., Abduraximova M. ZAMONAVIY VIRTUAL
LABORATORIYA PLATFORMALARIDAN FOYDALANIB KIMYO FANINI O
‘QITISH SAMARADORLIGINI OSHIRISH //Modern Science and Research. –
2025.
–
Т
. 4.
–
№.
5.
–
С. 48
-50.
34.
Tilyabov M., Khaydarov G., Saitkulov F. CHROMATOGRAPHY-MASS
SPECTROMETRY AND ITS ANALYTICAL CAPABILITIES //Development and
innovations in science.
–
2023.
–
Т
. 2.
–
№.
1.
–
С. 118
-121.
35.
Tilyabov M. Functional literacy competencies and methods for their development in
future teachers //
Решение
социальных
проблем
в
управлении
и
экономике
.
–
2025.
–
Т
. 4.
–
№.
2.
–
С. 5
-8.
36.
Shukurov Z. S. et al. Component Solubilities in the Acetic Acid
–
Monoethanolamine
–
Water System //Russian Journal of Inorganic Chemistry.
–
2021.
–
Т
. 66.
–
С
. 902-908.
37.
Tilyabov M. Innovative methods for developing functional literacy in teaching students
to think independently //
Наука
и
инновации
в
системе
образования
.
–
2025.
–
Т
. 4.
–
№. 2. –
С
. 5-8.
38.
Бобожонов Ж. Ш., Шукуров Ж. С. Изучение политермической растворимости
системы CH3COOH–
NH3
–
H2O.
–
2022.
39.
Бобожонов Ж. Ш., Шукуров Ж. С. ИЗУЧЕНИЕ ПОЛИТЕРМИЧЕСКОЙ
РАСТВОРИМОСТИ СИСТЕМЫ СН3СООН–
NH3
–H2O //ББК 74.58 я43 П27. –
С.
112.
40.
Бобожонов Ж. Ш. и др. РАСТВОРИМОСТИ КОМПОНЕНТОВ В ВОДНЫХ
СИСТЕМАХ, ВКЛЮЧАЮЩИХ ЭТАНОЛА С КАРБАМИДОЙ И ФОСФАТ
МОЧЕВИНОЙ //Евразийский Союз Ученых. –
2020.
–
№. 8
-5 (77).
–
С. 61
-64.
