SYNTHESIS OF HIGH-SILICONE ZEOLITES

During the study, the synthesis, texture and physicochemical characteristics of high-silica zeolites from bentonite and kaolin were studied. Adsorption isotherms are characteristic of type IV according to the de Boer classification and characterize the adsorption of monocellular substances. On the isotherm in the range P/P0 = 0-0,05, monomolecular adsorption in mesopores and adsorption in micropores are observed. At P/P0 = 0,05, monoand polymolecular adsorption is observed in mesocytes. P/P0 = 0,05-0,4 is a polymolecular adsorption field. Based on the obtained results, adsorption of gases CO2, H2S and NO2 by absorption of a mixture of salts CaCl2 • ZnCl2 • MnCl2/ HSZ into a synthesized sorbent was investigated. According to the results of the experiments, the dynamic capacity CaCl2•ZnCl2•MnCl2 / HSZ for hydrogen sulfide was 2.76% by weight. The total dynamic capacity of the adsorbent by H2S was higher than 20-25%. Introduction. In recent years, natural and artificial zeolites have been widely used in hydrocarbon processing. Adsorption methods are one of the most common hydrocarbon purification methods in the industry. Their use allows returning to production several valuable compounds [1-2]. The study of zeolites is devoted to many works. Zeolites are a microporous substance with the correct crystal structure and a controlled size not exceeding 2 nm [3-6]. Zeolitic scaffolds are lattices consisting of tetrahedral T-atoms (Т = Si, Al, etc.), Connected by atoms in oxygen. More than 200 types of synthetic zeolites of various structural types are currently known [7-9]. However, no more than 10% of all known structures are produced in industry, and only 5 structural types are actually used as catalysts [10-13]. The most important requirements for adsorbent materials are high specific surface area, selectivity and ease of regeneration [14-15]. The adsorbent must also be inexpensive and harmless, non-corrosive, capable of maintaining its adsorption properties for a long time and having high mechanical strength. One of the most common adsorbents is activated carbon, which is available in various brands. One of the most important directions today is the development of environmentally friendly sorbents, preservatives and catalysts based on local raw materials [16-17]. Experiment. To determine the chemical and physicochemical characteristics of the synthesized high-silicon zeolites, samples of pellets weighing 100 g were placed in a glass flask with a volume of 250 cm and poured with 150 cm of distilled water. The flask was stirred on an АВУ-6 device at 120 rpm for 24 hours. After drying, the adsorbent was passed through a 0.5 and 0.25 mm sieve and the remaining samples through a 0.25 mm sieve were passed through a 0.5 mm sieve. chemical characteristics were studied. Before acid treatment, the soil was ground to 0.08 mm. To 10 g of ground, the soil was added 40 g of heated H2SO4 and heated by stirring in a water bath. After treatment, the soil was filtered through a paper filter in a Buchner funnel and washed with distilled water at pH = 5.4-5.7. The soil was then dried in an oven at 120 C with filter paper for 5 hours. The distribution of pores by specific surface area and size was detected on the automatic absorptiometer “ASAB 2010” by low-temperature nitrogen desorption. Sedimentation analysis was carried out by Szeptember 18, 2020 Budapest, Magyarország 17