Journal of Science and Innovative Development ISSN 2181-4317

SOME ASPECTS OF THE SYNTHESIS OF MODERN ZEOLITE ADSORBENTS - DEHYDRATOR OF THE TYPE ‘A’ (4A)

Ғуломов Шухратқодир Ташматович, Исаева Нурхон Фархатовна, Султанов Азиз Рустамович, Гашенко Галина Александровна, Юнусов Мирахмад Пулатович April 27, 2021

Abstract

<p>The current tendency in the production of adsorbents is the development of zeolites&nbsp;with a complex of adsorption properties and high mechanical strength. The main raw materials&nbsp;for the synthesis of zeolites LTA (NaA and its exchangeable forms), FAU (NaX, NaY and their&nbsp;exchangeable forms) are traditionally sodium aluminate and sodium silicate gels, as well as kaolin&nbsp;clays. This piece of work reviews the impacts of the raw mixture&rsquo; components on the properties&nbsp;of the type &lsquo;A&rsquo; zeolite adsorbents obtained by the recrystallization of kaolinite method. The aim&nbsp;of the research is an attempt to develop a technology for the synthesis of zeolite adsorbents, the&nbsp;main crystalline phase of which is zeolite A, using raw materials containing signifi cant amounts&nbsp;<br /> of impurity minerals (quartz, illite). Characteristics of the samples of the zeolite adsorbents&nbsp;synthesized using Angren kaolin and the spent alumina adsorbents, which are the waste products&nbsp;from the Bukhara refinery, are presented. In general, the work is focused on the use of the kaolin&nbsp;raw materials somewhat depleted in aluminum and kaolinite in production of zeolite adsorbents&nbsp;- dehydrator of hydrocarbon and other gases used for technological purposes. Interesting results&nbsp;<br /> were achieved when a sodium aluminate solution based on the spent alumina adsorbents had&nbsp;been used in the crystallizable reaction mixture, preformed in the form of granules. The obtained&nbsp;samples were composite and featured the property of surface adsorption of benzene, the desorption&nbsp;of which occurs at a high rate. The developed technology enables obtaining zeolite-containing&nbsp;adsorbents with a wide range of adsorption-desorption properties.&nbsp;</p>