SU819058A1 - Method of producing analcime-type zeolite sodium - Google Patents

Description

one

This invention relates to a process for the preparation of crystalline molecular sieve zeolites of the type of analcime and can be used in ion exchange processes.

In nature, analcime is found in Sedimentary rocks in which it is released due to the action of saltwater on volcanic tuffs. The formation of analcime is also observed in volcanic rock strata affected by atmospheric waters heated by lava and partially due to the heat of their exothermic hydration reactions.

The idealized composition of nature analcime is as follows:

NdJ (.), O

depending

The density of analcime from the ratio of oscillating

AelS from 3.5 to 5.5, may be 2.242, 29 g / cm. Mohs hardness is 5.5. The refractive index ranges within N 1,479-1,493.

A known method for producing zeolite of the type of analcime from natural gay;

landite and clinoptilolite by treatment with solutions of NaOH and Ma, CO2 at a temperature and pressure of 2-3 atm. within two weeks 1.

The disadvantage of this method is the use of natural raw materials, which contain a significant amount of impurities of crystalline substances, which requires an appropriate

0 preliminary long hydro-alkaline treatment of natural raw materials, which, although it increases the activity of the reaction mass due to partial dissolution of the original rock, but not

5 fully ensures the uniformity of the aluminosilicate. In addition, a sophisticated hardware circuit is used due to the high pressure of water vapor at D8 ° C.

0

The closest to the proposed method to the technical essence and the achieved result is a method for producing zeolite of the type of analcime, including alkaline treatment of aluminum-silicate raw material - gel of composition Na, 20. A1, 0z-4510.3 at 180c, filtering and drying the product 12. According to the method, gel-like aluminosilicate prepared from pure chemicals in the pre-crystalline eduction period remains non-uniform. To effect crystallization, the process temperature is raised to, which results in the formation of less hydrated zeolites with the most compacted structure and narrow pores. In addition, under these conditions, the feedstock is not completely converted to analcime, impairing the properties of the target product with gel-like impurities. As a consequence, the zeolites obtained by the proposed method have a low adsorption capacity. The aim of the invention is to increase the adsorption capacity and thermal stability of the zeolite. The goal is achieved by using perlite rock as an aluminosilicate raw material, and before drying from (iltred after alkaline treatment, perlite rock is mixed with crystalline silica and the resulting mixture is treated with water at 100-150 ° C and F: T (3-5): 1 for 48-100 hours and dried. A distinctive feature of the proposed method is that perlite rock is used as the aluminosilicate raw material, and before drying the perlite rock is filtered after alkaline treatment and mixed with crystalline silica. This mixture is then treated with water at 100-150 ° C and W: T (3-5): 1 for 48-100 hours. According to the proposed method, crushed natural glass wool perlite with a particle size of colloidal size is treated with alkali with a concentration of 150- 200 g / l at 100-150 ° C for 4-24 h, the filtered solid precipitate before drying is mixed with and crystallized in water at 100-150 ° C and W: T (3-5): 1 for 48-100 This process does not directly transform the natural volcanic glass wool - perlite into anal The formation of rock is a new aggregate material that can easily turn into a crystalline substance with desired properties in solutions with the lowest alkali concentrations, imitating natural hydrothermal solutions. Example 1. 1000 g of perlite rock are treated in an alkali solution with a concentration of 150 g / l for 24 hours, the slurry is filtered and the solid is mixed with 200 g of crystalline and granulated to laugh. Dried aluminosilicate granules are crystallized in water at 150s, L: T 5: 1 for 100 hours. The finished zeolite granules of the analcime type are washed by decantation M and dried at 150 ° C. Quality characteristic of the sample:. Adsorption capacity, (water vapor). 0.24 Heat resistance, С465 Silicate module, 8 Parameters of an elementary cell (cube), L 13.74 ± 0.02 PRI me R 2. 1000 g of perlite rock are treated with an alkali solution with a concentration of 175 g / l at 125 ° С within 12 hours, the alkali suspension is filtered off, the solid precipitate is mixed with 200 g of crystalline Si i 0-2 and the mixture is granulated. Dried aluminosilicate granules crystallize in water at 125 ° C, W: T 3: 1 for 724i. The finished zeolite granules of the analcime type are washed by decantation and dried at. Quality characteristics of the sample: Adsorption capacity, (by water vapor) 0.23 Thermostability, with 470 Silicate SiO module. : Parameters of an elementary cell (cube), L 13.7410.02 Example 3. 1000 g of perlite rock is treated with an alkali solution with a concentration of 200 g / l for 4 hours, the alkali suspension is filtered, the solid residue is mixed with 200 g of crystalline Si02 and the mixture granulated. Dried aluminosilicate granules crystallize in water at 100 ° С and Ж: Т 4: 1 for 48 h. The finished zeolite granules of the analcime type are washed by decantation and dried at 150 s. Quality characteristic of the sample: Adsorption capacity, (by water vapor) 0.25 Thermal stability, C 460 Silicate module 510.2, 5 Parameters of elementary cells (cube), A 13.74 + 0.02 X-ray structural analysis data of a zeolite obtained known and proposed The methods listed in Table 1. Chemically the composition and refractive indices, synthesized and natural and nalcim, are presented in Table. 2, Physical and technical characteristics of zeolites of the type of analcime are presented in table. 3. Thus, the sorption capacity of the zeolite obtained by the proposed method is 0.230, 25 versus 0.20, as known, and the thermal

The structure's toughness increases by 20-65s.

Synthesized by the proposed method, the zeolite of the type of analcime, being

high-silica, can be used in high-temperature processes of oil refining (silicate modulus ranges from .5.0-8, ОХ.

Table

Note. I - intensity.

From effusive by

genus (natural) 1,48310,001

From nepheline pegmatite

Synchronized h: Kulka-chi

psdr

. d - interplanar spacing, A.

table 2

55.45 24.07 Trace 2.45 Trail 10.25 0.26 24.10 0.04 -, ", 50 - 0.002

50.70 23.66 0.61 1.23 0.36 11.650.4

1, 483 ± 0.01 430-440 1.586 ± 0.02

400

1.4V5 ± 0.001 465

Claims (1)

1.Amer. Miner, USA, 1971, 56, No. 9-10, p. 1724-1734. 2.3. Chem. Soc. 1267, 1951 (prototype).