SU1725973A1 - Method of making filtering material - Google Patents

Abstract

The invention relates to the preparation of a filtering material and can be used for the purification of gases from water vapor. The purpose of the invention is to increase the filtration capacity of the material by increasing the adsorption capacity of the original chrysotile asbestos. Chrysotilasbest is processed in a 5% solution of sodium hydroxide at 100-4500С, a pressure of 1-500 atmospheres for 12-35 hours, as a result of which its adsorption capacity increases 5-28 times. 6 tab., 5 Il.

Description

The invention relates to the preparation of a filtering material and can be used for the purification of gases from water vapor.

The aim of the invention is to increase the filtration capacity of the material by increasing the adsorption capacity.

This goal is achieved by treating chrysotile asbestos in a solution of 5% sodium hydroxide at 100-450 ° C and a pressure of 1-500 atm for 12-35 hours. The research results are shown in Table 1.

From the above modes, the optimal variant was chosen, which gives the greatest results in increasing the adsorption capacity. For the experiments, samples of chrysotile asbestos from various deposits were used.

Fig. 1 shows a diagram of an increase in the adsorption capacity of the brittle chrysotile asbestos of the Bazhenovsky deposit; Fig. 2 shows the same, of the soft chrysotile asbestos of the Bazhenovsky deposit; on fig.Z - that

the same, asbestos of the Youth field; 4 is the same asbestos of the Aspagash field; 4, too, of the Sary-Chekinskoye field.

Example. A portion of asbestos, pre-fluff, was placed in an autoclave with 5% sodium hydroxide solution. They were heated to 300 ° C at 100 atm and kept at these parameters for 20 hours. After that, asbestos was washed with distilled water and the adsorption capacity was tested with water vapor of the treated asbestos. The results are shown in table 2-6.

Table 6 shows the comparative characteristics of the value of the adsorption capacity obtained on asbestos of various deposits.

The change in the adsorption capacity is clearly visible in graphs 1-5, where the results of the study of asbestos treated in acidic, alkaline, and neutral media are presented for 12 and 20 hours.

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lines 1-7 in figure 1-5 show the change in the adsorption capacity:

1- raw untreated asbestos;

2- asbestos, treated in distilled water for 12 hours;

3- asbestos, treated in 5% NaOH solution for 12 h;

4- asbestos, treated in a 5% solution of NH4Cl for 12 h;

5- asbestos, treated in distilled water for 20 hours;

6- asbestos, treated in 5% solution of NaOH for 20 h;

7- asbestos, treated in 5% solution of MLTC 12h;

In Fig. 1, it is clearly seen that the adsorption capacity of asbestos treated in 5% NaOH solution for 20 h (curve 6), as compared with untreated asbestos (curve 1), increased 13 times. The adsorption capacity of asbestos treated for 12 hours (curve 3) is much less than 2 times and less processed in an acidic environment for 20 hours. All other lines indicate that the adsorption capacity of asbestos treated by other methods is not much different from adsorption capacity of the original asbestos.

Similar dependencies are seen in figure 2-5. The adsorption capacity of asbestos treated in an alkaline medium (curves 3 and 6) is much higher than the adsorption capacity of the original asbestos (curve 1) and higher than the adsorption capacity of asbestos treated in an acidic medium (curves 4 and 7). The adsorption capacity of asbestos treated in a neutral environment (curves 2 and 5) is slightly different from untreated asbestos.

As can be seen from the above tables and graphs, the application of the proposed method allows to obtain a filtering material with higher technical characteristics, which increases the operational capabilities of the filters used.

Claims (1)

Invention Formula A method of obtaining a filtering material, including the treatment of asbestos with a chemical reagent, characterized in that, in order to increase the filtration capacity by increasing the adsorption capacity, the treatment of asbestos is carried out in sodium hydroxide solution at 100-450 ° C and a pressure of 1-500 atmospheres for 12- 35 h. The results of experimental studies The adsorption capacity of the treatment products of the brittle chryso-tilasbest of the Bazhenovskoye field Table 1 thirty table 2 Adsorption capacity of chrysotile asbestos treatment products at the Molodezhnoye deposit Adsorption capacity of the processing products of chrysotile asbestos from the Aspagash field Adsorption capacity of processing products of chrysotile asbestos of Sary-Chekinsky deposit Table 3 Table 4 Table 5 Table