What is synthetic zeolite?

Natural and synthetic zeolites with molecular sieve properties are widely used as adsorbents. Synthetic zeolites or, which is the same thing, molecular sieves are aluminosilicate microporous adsorbents that have not only high selective adsorption, but also the ability to separate substances with different sizes and shapes of adsorbent molecules. They are distinguished by their strictly crystalline structure and large specific surface area. Zeolite pores are spherical cavities connected by channels. Currently, industrial enterprises produce different brands of zeolites, differing in cations and pore sizes. The most widely used zeolites are types A and X, which have two-digit designations: KA, Na A, CaA, NaX, CaX. The first part of the designation is the predominant metal in zeolites (K, Na, Ca). The second is the lattice type (A or X) – this classification of zeolites indicates the determining size of the diameter of the entrance window. The classification of zeolites in the USA and a number of other countries provides for an indication of the defining size of the zeolite (the rounded value of the diameter of the entrance window in A 0 ). However, the coincidence of the classification number and the defining size is observed only for type A zeolites. Russia KA NaA SaA SaKh NaKh USA 3A 4A 5A 10Х 13Х Input window diameter, A 0 (nm -1 ) 3 4 5 8 9-!0 According to their chemical composition, zeolites belong to aluminosilicate compounds, which include Al 3+, Si 4+ ions and metal ions of different valences. NaA type zeolite, for example, has the following composition: From SiO ratio₂: To the₂O₃ In zeolite, the acid resistance of the adsorbent depends, and it increases with increasing this ratio. Type A zeolites are low-silica forms, their SiO ratio is₂ : To the₂O₃ no higher than 2, and in an acidic environment they are destroyed. For type X zeolites, the same ratio is 2,2-3,3. Type X zeolites have fairly wide entrance windows and adsorb most components of complex mixtures: all types of hydrocarbons, organic sulfur compounds, mercaptans, halogenated hydrocarbons. The critical diameter determines the possibility of penetration of a given molecule into the zeolite cavities through the windows connecting them (see table No. 1) For elongated molecules (such as hydrocarbon molecules of normal structure), the critical diameter corresponds to the cross-sectional diameter of the hydrocarbon chain. If the critical diameter of the chain is close to the diameter of the entrance window, for its adsorption the kinetic energy of the molecule must be increased by increasing the temperature. At the same time, the thermal pulsation of the zeolite lattice increases and the penetration of the molecule into the cavity is facilitated. Table No. 1 Critical diameters d_cr and length L of molecules of various substances. Characteristics of domestically produced zeolites are given in Table 2. Table 2 Characteristics of domestically produced zeolites. Substances adsorbed by this celiolite Substances not adsorbed by this celiolite Water, carbon dioxide, hydrogen sulfide, ammonia, methanol, ethylene, propylene, etc., methane Water, carbon dioxide, hydrogen sulfide, ammonia, methanol, ethylene, propylene, ethanol, methane, normal alcohols, content up to 14 carbon atoms, methyl and ethyl mercaptans Water, carbon dioxide, hydrogen sulfide, ammonia, methanol, ethylene, propylene, ethane, methane, normal alcohols containing up to 14 carbon atoms, methyl and ethyl mercaptans, isoparaffin hydrocarbons, benzene, mercaptans, toluene, Water, carbon dioxide, hydrogen sulfide, ammonia, methanol, ethylene, propylene, ethane, methane, normal alcohols containing up to 14 carbon atoms, methyl and ethyl mercaptans, isoparaffin hydrocarbons, benzene, mercaptans, toluene, high molecular weight naphthenic and aromatic hydrocarbons Propane, isobutane and other isoparaffins, isoalcohols, benzene and other aromatic hydrocarbons; substances with a molecular size greater than >0,5 nm Aromatic hydrocarbons and their derivatives with branched radicals Zeolites are a unique drying agent. The adsorption of water on zeolites has a number of characteristic features. 1. High absorption capacity in the region of low partial pressures of water vapor. The adsorption capacity of zeolites at ordinary temperatures already at a pressure of 1-2 mm Hg. Art. close to the adsorption capacity at maximum saturation. Advantages of all types of zeolites at low adsorbent pressures before other adsorbents is clearly visible from the data in Table 3. Table 3. Adsorption capacity (in g/100 g) of industrial adsorbents for water vapor at 25 0 C. Adsorption capacity at different pressures, g/100 g 2. The second distinctive ability of water vapor adsorption on zeolites is that the adsorption capacity is high even at elevated temperatures. At 100 0 and a water vapor pressure of 10 kPa for zeolites it reaches 15-16 g/100g; even at 200 0 it is still significant (4g/100g). In this temperature range, the adsorption capacity of silica gels and aluminum oxide is practically zero. The ability to carry out the drying process at high temperatures is especially important in those industrial installations where the process gas removed from the high temperature zone must be returned back to the reaction zone. Replacing conventional sorbents with zeolites allows in some cases (for example, when drying natural gas in fields and gas processing plants) to avoid the stage of cooling the gas being dried, which leads to a significant reduction in energy costs and simplification of the circuit. 3. Zeolites are characterized by a very high rate of moisture absorption. A high degree of drying is maintained throughout almost the entire stage. The increase in moisture content at the end of the stage does not occur gradually, as is observed when using other solid adsorbents, but sharply and quickly. Due to the high rate of water absorption, adsorption takes place in a working layer of small height (usually less than 10 cm). Consequently, it becomes possible to design more compact installations. 4. Zeolites make it possible to dry it at high gas flow rates and thereby significantly speed up the process. Thus, changing the gas speed from 4 to 15 m/min (which corresponds to the speeds used in industrial adsorbers) practically does not lead to a decrease in activity. Even at a speed approaching 20-25 m/min, a 60 cm high sorbent layer guarantees gas drying to a dew point below minus 65 0 C with an adsorption capacity of 15 g/100 g. 5. Zeolites provide the highest degree of drying: the dew point of dried gas can reach minus 80 0 C and even lower. Zeolites greedily absorb moisture, but they do not readily release it during regeneration. Summarizing the experience of using zeolites for gas drying, we can conclude that they have a number of advantages over other drying agents. Zeolite comes on sale in the form of cuttings and balls. Recently, zeolite in the form of a ball has become in greatest demand in the USA and other European countries. The frictional resistance of spherical particles is less than that of cylindrical ones, and the formation of dust in spherical ones is 3-5 times less. The gas industry is the largest consumer of zeolites. To a large extent, the widespread use of zeolites in this area was facilitated by increased requirements for the degree of gas drying, which were introduced in connection with the introduction of cryogenic systems for the separation of hydrocarbon gases. During separation, natural gas is cooled to -160 0 C, in helium plants to -170 0 C. Neither the glycol method nor the use of conventional solid desiccants guarantees a drying depth that ensures long-term continuous operation of separation equipment under these conditions. The solution to the problem became possible only after the use of zeolites. The selectivity of zeolites with respect to water vapor is so pronounced that the presence of a number of components has virtually no effect on the nature of moisture extraction. Higher hydrocarbons do not penetrate the fine pore structure of NaA zeolites. This eliminates the decontamination that occurs with conventional solid desiccants. Therefore, the service life of NaA zeolites is significantly higher than that of conventional adsorbents. At the same time, when drying natural gas with NaX zeolites with larger inlet windows, there is a slight decrease in the absorption capacity and rate of adsorption of water vapor due to pre-adsorption of high molecular weight hydrocarbons. In this regard, in the vast majority of cases, NaA zeolite is used for drying natural and other industrial gases. Despite all their undeniable advantages, zeolites have two significant drawbacks: the difficulty of regeneration and high cost. Therefore, in each specific case of using zeolites for drying or purifying gases, it is necessary to carefully calculate and analyze the need for using a given zeolite from an economic and technological point of view. 1. Keltsev N.V. “Fundamentals of adsorption technology” 2nd ed., M., 1984. 2. Zhdanova N.V., Khalif A.L. “Drying of hydrocarbon gases”, M., “Chemistry”, 1984. 3. Campbell D.M. “Cleaning and processing of M.,” Nedra, 1977. 4. Straus V. “Industrial gas purification”, M., “Chemistry”, natural gases, 1981. 5. GOST R 53521-2009 – Processing of natural gas. M., Standardinorm, 2010. 6. Kondaurov S.Yu. and others. “Prospects for the use of adsorption technologies for the preparation of gas for transport”, J. “Gas Industry”, 2010, No. 10.p.52 Our online store “MegaChem” offers synthetic zeolite NaA from leading manufacturers, at wholesale prices, with convenient delivery in Ukraine. The inorganic compound is one of the types of highly efficient artificial sorbents. Due to its selective adsorbing properties, NaA zeolite is actively used in various fields – from chemical reactions in laboratory conditions to industrial purification of gases and water. If you need to buy NaA zeolite at a competitive price, with a certificate of compliance with international standards, place your order through our online catalog. The artificial sorbent is supplied in the quantity you require, in original, completely sealed packaging, suitable for both further use and long-term storage under conditions recommended by the manufacturer.

Properties of synthetic NaA zeolite

• effective adsorption of water vapor, ammonia, carbon dioxide, acetylene;
• ability to selectively separate molecules;
• purification of galvanic industrial wastewater;
• absorption of unpleasant odors;
• positive effect on soil compositions (preventing mold, absorbing herbicides, potassium nitrate, minimizing acidity, increasing water capacity);
• antioxidant properties;
• accelerating wound healing, tissue regeneration, improving chemotherapy tolerance (pharmaceuticals).

Characteristics of synthetic NaA zeolite

Externally, synthetic NaA zeolite is elongated tubular or round granules with different diameters (5-8 mm). The compound has no distinct odor. Color – from light beige to terracotta, with a glassy pearlescent sheen. The frame structure is microporous, crystalline. The substance is produced on an industrial scale by synthesis with hydrothermal crystallization, washing, and drying.

Artificial zeolite belongs to hazard group III; when used correctly, it does not have a harmful effect on humans or the environment. The connection is explosion- and fireproof. However, dust can irritate and damage the respiratory tract. Therefore, when working with zeolites, with prolonged contact, the use of PPE is recommended.

Chemical properties of synthetic NaA zeolite

Artificial aluminosilicate selectively absorbs molecules. The structural features of the compound allow it to absorb and retain various substances. Zeolite also has reversible adsorption properties. It is practically insoluble in water. The NaA variety of zeolite absorbs components of industrial gases with molecular sizes up to 0.4 nm. It can be:

• carbon disulfide, hydrogen sulfide;
• ammonia;
• ethylene;
• argon;
• neon;
• acetylene hydrocarbons;
• xenon;
• krypton;
• methane, etc..

In this case, propane and compounds with more than 1 carbon atoms in 3 molecule are not adsorbed by synthetic NaA zeolite.

Application of synthetic NaA zeolite

Through our online store “MegaChem” you can buy NaA zeolite in bulk for various purposes. The connection is used for:

• water treatment at industrial, municipal, commercial facilities (water purification and softening, filtration);
• environmental purposes (purification of wastewater, gases, soil remediation);
• production of building materials;
• paper and pulp production;
• removal of radionuclides from waste from nuclear chemical plants;
• production of pharmaceuticals.

Synthetic NaA zeolite is a component of vacuum pumps; the compound is added to the formulas of detergents and mineral fertilizers for the agricultural sector. The substance is added to livestock feed. Many petroleum refining processes are carried out using artificial zeolites.

Synthetic zeolite NaA price

Through our online catalog “MegaChem” you can buy synthetic NaA zeolite at the best price. Our company is focused on cooperation directly with manufacturers. Therefore, the cost of goods is optimal and does not include intermediary overpayments. Significant discounts are provided for large wholesale quantities. You can find out the price of your order by contacting our managers.

When purchasing synthetic NaA zeolite with a volume of over 300 kg, delivery to Kyiv, Kharkov, Zhitomir, Chernigov, Lvov, and other cities of Ukraine is carried out by our company “MegaChem”’s own transport. The products are supplied in original packaging, you can order the required quantity.

Do you want to buy synthetic NaA Zeolite inexpensively and with delivery throughout Ukraine? Megachem.com.ua is pleased to present you a wide range of chemical products from trusted manufacturers in Ukraine and Europe. With us you can find everything you need for various industries at competitive wholesale prices or make a retail purchase. Find out more information from our sales department by calling: (050) 182-77-75; (067) 219-73-77; (093) 219-73-77; (044) 333-41-75 or make a purchase on the website and get professional advice!

We will promptly deliver synthetic Zeolite NaA to the following cities: Kyiv, Kharkov, Dnepr, Odessa, Lviv, Ivano-Frankivsk, Rivne, Lutsk, Ternopil, Uzhgorod, Vinnitsa, Zaporozhye, Poltava, Chernivtsi, Nikolaev, Sumy, Zhitomir, Khmelnitsky, Cherkasy, Chernigov , Kherson and other cities of Ukraine.

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