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POLYTHERMAL SOLUBILITY OF THE NA2SO4MGSO4 - NACL-H2O SYSTEM
Utkir Rakhmatzhanov
Basic doctoral student, Tashkent Institute of Chemical Technology Uzbekistan, Tashkent E-mail: [email protected]
Ruslan Yorbobaev
PhD, Senior lecturer of Tashkent institute of chemical technology Republic of Uzbekistan, Tashkent
Kholtura Mirzakulov
Doctor of Science in Technics, prof., Tashkent Institute of Chemical Technology Tashkent, Uzbekistan
ПОЛИТЕРМИЧЕСКАЯ РАСТВОРИМОСТЬ СИСТЕМЫ NA2SO4MGSO4 - NACL-H2O
Рахматжанов Уткир
базовый докторант, Ташкентский химико-технологический институт Республика Узбекистан, г. Ташкент
Ёрбобоев Руслан
PhD, ст. преподаватель, Ташкентского химико-технологического института, Республика Узбекистан, г. Ташкент
Мирзакулов Холтура
д-р техн. наук, проф., Ташкентский химико-технологический институт Республика Узбекистан, г. Ташкент
ABSTRACT
In this work, the solubility of the Na2SO4-MgSO4 - NaCl-H2O system was studied using a visual polythermal method. Based on the polytherms of binary systems and internal cross sections, polythermal solubility diagrams of the Na2SO4-MgSO4 - NaCl-H2O system were constructed in the temperature range from -25.2 to 41.0 °C. When studying the solubility of this system, polytherms were carried out in each temperature range of 10 ° C. On the polythermal solubility diagram the crystallization regions of ice, Na2SO4-MgSO4, MgSO4 l0H2O, NaCl, NaCl-^O, Na2SO4• MgSO4 2H2O, Na2SO4-MgSO4-4H2O and compound of the composition MgCb were delimited. Based on the results of the study, it was revealed that the Na2SO4-MgSO4 - NaCl-H2O system belongs to a complex eutonic type.
АННОТАЦИЯ
В этой работе было изучено растворимость системы Na2SO4MgSO4 - NaCl-H2O с помощью визуального политермического метода. На основе политерм бинарных систем и внутренних сечений было построено политермические диаграммы растворимости системы Na2SO4MgSO4 - NaCl-H2O в интервале температур от -25,2 до 41,0 °С. При изучении растворимости этой системы политермы проводились в каждом интервале температур 10 °С. На диаграмме политермической растворимости были выделены области кристаллизации льда, Na2SO4-MgSO4, MgSO4-mH2O, NaCl, NaCl-^O, Na2SO4-MgSO4-2H2O, Na2SO4• MgSO4 4H2O и соединения состава MgCl2. На основе результатов исследования было выявлено что система Na2SO4-MgSO4 - NaCl-H2O относится к сложному эвтоническому типу.
Keywords: solubility, system, diagram, magnesium sulfate, sodium sulfate, sodium chloride, crystallization temperatures.
Ключевые слова: растворимость, система, схема, сульфат магния, сульфат натрия, хлорид натрия, температуры кристаллизации.
Библиографическое описание: Rakhmatzhanov U., Yorbobaev R., Mirzakulov K. POLYTHERMAL SOLUBILITY OF THE Na2SO4-MgSO4 - NaCl-H2O SYSTEM // Universum: технические науки : электрон. научн. журн. 2024. 10(127). URL: https://7universum.com/ru/tech/archive/item/18435
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QKra6pb, 2024 r.
Introduction
One of the main directions of economic development in developing countries is the exploitation of natural raw materials, the production of competitive, import-substituting products based on local raw materials through its complex processing. Such chemical products include sodium and magnesium sulfates, as the need for these products increases every day with the development of industry and production [1-3].
The laws of solubility of salts and the equilibrium of liquid and solid phases are crucial in establishing the scientific basis for separating or purifying salts, especially those with complex compositions, for various applications [4-7]. Several scientists have conducted modern studies on salt systems to support the production of chemical products and the improvement of technologies [8-10]. In addition, several studies that have researched MgSO4 and Na2SO4 as their objects are known from the literature.
Materials and methodology
The polythermal solubility of the Na2SO4-MgSO4 -NaCl-H2O system was studied by the visual polythermal method [11]. Liquid nitrogen was used as a freezing reagent in the study of solubility of solutions. In the
quantitative chemical analysis of liquid and solid phases, the content of magnesium ions was determined by the complexometric method [12], sodium by flame photometry [13], chloride ions by the Mohr method [14].
Results and discussion
The binary system NaCl-H2O was previously studied by the authors [15], this system is part of the system we are studying, and our data are in good agreement with the literature data.
The solubility of the Na2SO4-MgSO4 - NaCl-H2O system was studied using eight internal sections. Based on the results of the study of binary systems and internal sections, a complete polythermal diagram of this system was constructed in the temperature range from -25.2 to 41 °C. The crystallization fields of ice, Na2SO4-MgSO4, MgSO4 l0H2O, NaCl, NaCl-^O, Na2SO4• MgSO4 2H2O, Na2SO4-MgSO4-4H2O and a new compound of the system - magnesium chlorides are highlighted on the phase diagram of the solubility of the Na2SO4-MgSO4 - NaCl-H2O system. These fields converge at six triple nodal points of the system, for which the compositions of the equilibrium solution and their corresponding crystallization temperatures are determined, which are shown in Fig. 1.
Figure 1. Polythermal diagram of the solubility of the Na2SO4MgSO4 - NaCl-H2O system
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On the polythermal diagram, the fields of the formed crystals of the system are highlighted in bold lines, and these fields are named accordingly. These fields arise at six triple nodal points of the system, for
октябрь, 2024 г.
which the corresponding compositions of the equilibrium solution and crystallization temperatures are determined (Table 1).
Table 1.
Binary and ternary points of Na2SO4-MgSO4 - NaCl-№O system
Composition of the liquid phase (wt.%) Tc (°С) Solid phase
NaCl Na2SO4-MgSO4 H2O
- 11.8 88.2 -5.2 Ice + Na2SO4-MgSO4
9.0 10.1 80.9 -11.0 The same
11.5 10.1 78.4 -12.0 Ice + Na2SO4-MgSO4 + MgSO4- IOH2O
11.8 8.2 80.0 -13.4 Ice + MgSO4l0H2O
12.1 5.0 82.9 -16.8 Ice + MgSO4- IOH2O + MgCl2
19.6 2.4 78.0 -22.5 Ice + MgCl2
20.4 2.0 77.6 -25.2 Ice + MgCl2 + NaClH2O
21.2 - 78.8 -23.0 Ice + NaCl
28.2 1.2 70.6 -3.0 NaClH2O + MgCl2 + NaCl
28.6 - 71.4 -1.0 NaClH2O + NaCl
28.8 1.0 70.2 -8.8 MgCl2 + NaCl
12.4 8.0 79.6 -15.4 MgSO4l0H2O + MgCl2
15.4 9.7 74.9 -9.2 The same
19.5 13.2 67.3 -5.4 -//-
20.5 16.3 63.2 4.0
21.2 17.7 61.1 5.6
25.0 19.3 55.7 11.0
25.3 19.8 54.9 13.0
28.7 21.0 50.3 19.0 -//-
9.8 16.4 73.8 -2.0 Na2SO4-MgSO4 + MgSO4l0H2O
9.6 19.6 70.8 5.0 Na2SO4-MgSO4 + Na2SO4-MgSO4-2H2O + MgSO4l0H2O
6.4 19.9 73.7 6.5 Na2SO4-MgSO4 + Na2SO4-MgSO4-2H2O
- 20.8 79.2 9.0 The same
9.4 25.0 65.6 18.0 Na2SO4• MgSO4 2H2O + MgSO4- IOH2O
9.5 28.0 62.5 24.0 The same
9.6 29.9 60.5 26.5 Na2SO4• MgSO4 2H2O + Na2SO4-MgSO4-4H2O + MgSO4l0H2O
8.8 30.0 61.2 27.4 Na2SO4• MgSO4 2H2O + Na2SO4-MgSO4-4H2O
4.3 31.3 64.4 30.2 The same
- 31.6 68.4 32.5 -//-
9.8 34.4 55.8 30.0 Na2SO4• MgSO4 4H2O + MgSO4^ IOH2O
9.9 35.0 55.1 32.0 The same
10.2 38.1 51.7 36.0 -//-
10.4 39.0 50.6 41.0
From the above data, it can be seen that there is no chemical interaction between the components of the system under study. The system belongs to a complex eutonic type.
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Conclusion
components. This indicates that the system under study belongs to a complex eutonic type. And so, these results provide new scientific data to researchers studying graphical analysis of salt systems.
Thus, the results of the study showed that during the study of the Na2SO4-MgSO4 - NaCl-H2O system, a new compound is formed as a result of the interaction of the
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