Dilorom Xolmo'minova - Academia.edu (original) (raw)

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Papers by Dilorom Xolmo'minova

The electrochemical properties and swelling abilities of new hydrogels of acrylic acid derivative... more The electrochemical properties and swelling abilities of new hydrogels of acrylic acid derivatives in an aqueous solution, as well as their conformational transformations during the transition from one state to another, have been studied. The mutual influence of the physicochemical parameters of aqueous solutions, including electrical conductivity, pH media, and the swelling coefficient of hydrogels, has been studied. It has been established that during the ionization of hydrogels in an aqueous medium, intramolecular associates are formed with the participation of a proton and carboxylate anions, stabilized by hydrophobic interactions of the network structure of a sparsely crosslinked polyelectrolyte. It is shown that this process is accompanied by a sharp change in the pH values of the medium, an increase in the electrical conductivity and the swelling coefficient of the hydrogel in water.

In the study, the application of the catalyst containing (MoO 3) x •(ZnO) y •(ZrO 2) z /HSZ in th... more In the study, the application of the catalyst containing (MoO 3) x •(ZnO) y •(ZrO 2) z /HSZ in the catalytic aromatization of the propane-butane fraction was investigated. The experiments were carried out in a flow catalytic device in the stationary phase of the catalyst (catalyst volume 6 cm3), at 450-600ºC, at normal atmospheric pressure (P = 0.1 MPa), under volumetric rate of propane-butane fraction 400-600 h-1. As the result of the experiment, the best modifying additives were found Zn, Zr, Ga, and Mo. The conversion of propane begins at 450ºC and reaches 100%; where the total conversion of propane reaches 600ºC. Aromatic

The purpose of this work was synthesis of new surface-active derivatives of maleic acid and estab... more The purpose of this work was synthesis of new surface-active derivatives of maleic acid and establishing correlations between their colloid-chemical properties. The well-known methods for synthesis and determining the properties of surfactants were used in the work. The new surface-active derivatives of maleic acid were synthesized and their colloid chemical properties investigated. The synthesis of new surfactants was carried out by condensation of maleic anhydride with ethylenglicols and the reaction product was esterified with primary alcohols. The surface activity and foaming ability of the obtained new surfactants in aqueous solutions were studied. The obtained results showed that with an increase in the length of the aliphatic hydrocarbon chain, the surface activity of benzoic acid derivative surfactants increases. The analysis of results showed a good correlation between the foam forming ability and the surface activity of the studied surfactants. Based on the studies it was established that the stability of foams is significantly determined by the interaction of surfactant molecules in the monolayer.

АННОТАЦИЯ Установлено, что образованные техногенные факторы в пределах Голодной степи сейчас не о... more АННОТАЦИЯ Установлено, что образованные техногенные факторы в пределах Голодной степи сейчас не оказывают прямого негативного влияния на гидродинамические и гидрохимические условия в перспективных месторождениях пресных подземных вод, расположенных в его окраинной части,-Зааминское, Раватское, Санзарское. В Санзарском № 2 (92) февраль, 2022 г. 6 месторождении пресных подземных вод, являющихся основным источником хозпитьевого водоснабжения г. Джизака и прилегающих населенных пунктов, влияние негативных последствий очень интенсивно, поэтому необходимо принять срочные мероприятия по улучшению рационального использования подземных вод. ABSTRACT It has been established that the formed technogenic factors within the Hungry Steppe do not currently have a direct negative impact on the hydrodynamic and hydrochemical conditions in promising fresh groundwater deposits located in its marginal part-Zaaminskoye, Ravatskoye, Sanzarskoye. In the Sanzar field of fresh groundwater, which is the main source of domestic drinking water supply for the city of Jizzakh and adjacent settlements, the impact of negative consequences is very intense, which makes it necessary to take urgent measures to improve the rational use of groundwater. Ключевые слова: техногенный фактор, техногенный объект, озерная система, водные ресурсы, азот, сбросные воды, водозабор, скважина, загрязнение вод.

Аннотация-Получены новые ПАВ на основе утилизации отходов производства капролактама. Для получени... more Аннотация-Получены новые ПАВ на основе утилизации отходов производства капролактама. Для получения ПАВ кубовые остатки бензойной кислоты сульфировали концентрированной серной кислотой в присутствии катализатора Al2(SO4)3 и продукт реакции этерeфицировали высшими одноатомными спиртами. Изучены поверхностная активность и пенообразующая способность полученных новых ПАВ в водных растворах. Показано, что с ростом длины алифатического углеводородного радикала поверхностная активность ПАВ производных бензойной кислоты увеличивается. Установлено, что имеет место хорошая корреляция между пенообразующей способностью и поверхностной активностью изученных ПАВ. Показано, что устойчивость пен в значительной степени определяется взаимодействием молекул ПАВ и добавок в монослое.