SU1255175A1 - Method of producing sorbent for cleaning gases - Google Patents

Description

ten

12551

The invention relates to methods for producing a sorbent for the purification of gases from Clj, Br, HF, fluorine oxides and fluorine anhydrides of fluororganic acids, and can be used in chemical engineering.

The purpose of the invention is to increase the sorption capacity for chlorine and bromine and to increase the degree of purification from fluorine oxides.

Example 1. When preparing 1 ton of sorbent by treating wood waste with an alkaline solution and adding a reducing agent, use 0.55-0.6 tons of caustic soda and not more than 0.08-0.1 tons of a reducing agent (sulfite or sodium or potassium thiosulfate). The solution after separation, mercerized wood is reused.

Mercerized wood consumption for catching 1 ton of gases

five

with a purity of 100% is

2.9-3.0 t. Per 1 t, the specific consumption of materials for the preparation of the sorbent is, t: wood 1.35 - - 1.6; caustic soda 1.6-1.8; reducing agent 0,24-0,3.

Example 2 Wood chips are subjected to mercerization with 25% sodium hydroxide solution containing 3.1 wt.% Sodium sulfite for 1 day at room temperature. 11.3 g of pressed shavings are placed in a flow column, through which 37 l of a gas-air mixture containing 52020 mg / m of chlorine are passed at a speed of 0.28 m / s. The chlorine concentration in the purified gas is 70 mg / m, the degree of purification is 99.9%. The dynamic capacity of the sorbent is 16.8%.

The table shows the results on the dynamic capacity of the sorbents and the degree of gas purification.

12 KOH

15

K, 5.0, 10.0 Btj

13 NaOH30 Na, 0

7.9

Br.

Note. Mercerrization of wood shavings in all experiments was carried out at room temperature B for one day.

Editor S.Patrusheva

Compiled by G.Vinokurova Tehred L. Serdyukoea

Order 4741/6 Edition 663

VNIIPK USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Table continuation

1230 O

0.06 0.035

15.1 13.7

97,8 lOO

Proofreader V. But ha

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Claims (1)

METHOD FOR PRODUCING SORBENT FOR GAS CLEANING from halogen-containing acidic impurities, comprising treating wood chips with an alkali metal hydroxide solution containing an inorganic substance, characterized in that, in order to increase the sorption capacity for chlorine and bromine and to increase the degree of purification from fluorine oxides, as an inorganic additives use sodium or potassium sulfite or thiosulfate in an amount of 1-10 wt.%.