SU762940A1 - Method of cleaning gaseous media - Google Patents

Description

The invention relates to methods for cleaning gas media from toxic impurities, in particular, from trace impurities of selenium, arsenic, fluorine and tellurium.

The known method of cleaning gas media from tellurium micro impurities by adsorption on solid silica gel ‘le I- 10

Also known is a method of cleaning gas media from trace impurities of selenium and arsenic by adsorption on solid silica gel [2 ^.

However, this method does not provide the necessary completeness of cleaning. In addition, a disadvantage of the known method is the impossibility of simultaneously cleaning gas media from other toxic components (fluorine 20 and tellurium) contained in process gases.

The purpose of the invention is to increase the degree of purification of gaseous media from toxic impurities, as well as to achieve simultaneous purification of fluorine and tellurium from trace impurities.

This goal is achieved by

What’s clearing gas mixtures

using silica gel mod2

milled with titanium or zirconium, or hafnium, or cerium. "......

The degree of purification of gas mixtures. St toxic trace elements of selenium, arsenic, fluorine and tellurium reaches 97.6%.

Primer p. Gas mixture containing; 5е0а “20 mg 5e / nmh TeodOd" *

20 mg e / nm, 51R4, HP -? F 12 mg / Nm ^ Az ^e O _z "mg As / nm ₂ 0 and N 2." remainder by volume was passed through a solid sorbent. The sorbent used is silica gel modified by titanium by sorption of the latter from the solution, then calcined at a temperature of 400 ° C for

4.5 hours

The above gas mixture at a temperature of 350 ° C is passed through a layer of sorbent with a fictitious residence time of the gas mixture in the layer of sorbent 1.5 s. The cleaning is carried out before the breakthrough of adsorbed 5% relative micromixes, followed by chemical analysis of the content of extracted components.

The degree of purification of gas mixtures is, for example; 97.5% 5e,

97.3% Te, 97.3% P, 97.2% Az.

762940 '

Data on the use of gas mixtures for purification of selenium, tellurium fluorine and arsenic using silica gel modified with titanium or zirconium, or hafnium, or cerium are tabulated below.

Cleaning method Sorption capacity The degree of purification.% $ e Those > P Az 5 e Those R Az Known method 0.3 - - 0.2 97.3 -. - 97.0 -

The proposed method with the use of modified silica gel as a sorbent, wt.%:

zirconium 4.8 3.3 3.5 2.1 1.7 97.2 97.3 97.5 97.6 hafnium 8.0 3.3 3.5 2.1 1.7 97.5 97.4 97.1 97.0 cerium 7.5 4.3 4.4 2.1 1.8 97.5 97.4 97.5 93.3 titanium 3.5 3.3 and 3.4 2.0 1.6 97.5 97.3 97.3 97.2 As can be seen from the table, use thirty tea giver with i by that what,

the proposed method provides an increase in the degree of purification of gas mixtures from toxic impurities, and also allows the simultaneous purification of fluorine, selenium, tellurium and arsenic.

Claims (1)

Claim The method of purification of gaseous media from trace impurities of selenium and arsenic using silica gel, o t l and 40 35 increase the degree of purification and achieve simultaneous purification of trace fluorine and tellurium, using silica gel modified with titanium, or zirconium or hafnium, or cerium.