SU820875A1 - Solution for cleaning gases from nitrogen oxide and hydrocarbon - Google Patents

Description

(54) SOLUTION. FOR CLEANING GAS FROM NITROGEN OXIDE AND HYDROGEN

The invention relates to the purification of exhaust gases from highly toxic impurities and can be used to simultaneously purify gases from nitric oxide and hydrogen sulfide produced after combustion of fuel containing impurities of nitrogen and sulfur compounds, such as boiler and boiler exhaust gases, to clean flue gases from TPP, working on stone and brown coal, as well as various syntheses.

A known solution for reducing nitric oxide to N3.0 with carbon monoxide, containing the following components wt. %: rhodium (III) chloride - 1.63 5.8710 v hydrochloric acid 1, 17 3,410, ethyl spray 60-70, water - the rest. This solution allows the reduction of nitric oxide with carbon monoxide at room temperature at a rate of 0.331, 33 h 1..

The disadvantages of this method are the low rate of reduction of nitric oxide and the use of precious metals.

The closest to the proposed technical essence and the achieved result is a solution for

simultaneous purification of gases from nitrogen oxides and hydrogen sulfide, containing the following components, wt.%; potassium methyl - 1.37-5.5, perchloric acid - 3.71-7.42, water - the rest. This piacTBop allows the reduction of nitric oxide with hydrogen sulphide at room temperature at a rate of 11.4-28.5 h-G21

0

The disadvantage of this solution is the low reducing ability of nitric oxide (28.5 h) and the oxidizing ability of hydrogen sulfide (40 h-M.

five

The aim of the invention is to increase the redox capacity of the solution.

The goal is achieved by

that the solution for the purification of gases from nitric oxide and hydrogen sulfide, including an alkali metal halide, perchloric acid and water, additionally contains iron chloride

and, as a halo-alkaline methyl halide, sodium chloride in SL (Wunmec, weight ratio of components, wt.%;

, 01-1.65

.5-5, uh

FeCgj0.12-0.4

HjO Else

This solution allows to increase the rate of reduction of azo oxide. up to 36-96 (1 tray of 11.4-28.5 hours) and oxidation of hydrogen sulfide 70-180 (against 28.5-45.0) and lower the acidity of the medium.

.Example.; A solution of the following composition, wt.% ReSbz - OL2, 0.01, HCE04 / 5 4, water is the rest, is placed into a shaken 180 ml vessel. Then a gas mixture containing,% by volume: HgS 710 is passed through the solution, the rest - nitrogen and N0 -, the rest is nitrogen. The transmission rates of hydrogen sulfide and. nitrogen oxides are varied so as to achieve the complete absence of N0 and H2S at the outlet of the reactor. For a solution of this composition, the rate of absorption of nitric oxide is 60 hours and HjS - 120 hours.

The gas mixture from the reactor is analyzed continuously iodometrically. The rates of absorption of nitric oxide and hydrogen sulfide do not change after the absorption of 120 liters of gas mixture and 60 liters of N2-MO.

PRI mme R 2. At a 180 ml shake-up reaction vessel, place a solution of the following composition, wt. %: FeCfg- О ,, Laos € 0, 01, HCfO - 5 ,. water - the rest For example, using gas mixtures, vol. %; N0 -, HgS - 7.10; the rest is nitrogen. The experiment was carried out according to the procedure of Example 1. The rate of absorption of nitric oxide is 90 hours, and that of hydrogen sulfide is 180.

Froze At t 25®С in (a built-in 180 ml vessel, a solution of the erupted composition of its composition in wt.% Is placed: FeCfj-OJ2, NaCE- 0.01,

 1.5, water - the rest. For example, gas mixtures are used. vol.%: N0 - 3.5, the rest is nitrogen and 2 5.5-10, the rest is nitrogen. The absorption rate of N0 is 36 hours, hydrogen sulfide is 70 hours. EXAMPLE 4. With a shaking reaction vessel with a volume. 180 ml place a solution of the following composition, wt. %:, HC 104- 5 ,, NaCf - 1.65, the remaining water. For example, mixtures-vol.%: N0 - 3.0-10 is used, the rest is nitrogen and H2S - 4.510, the rest is nitrogen. The N0 absorption rate is 96 h, hydrogen sulphide 150 h-h

Claims (2)

1.J. Amer.Chem. Soc. 98, 6, 1364 (1976). 2. USSR author's certificate according to the application 2507231/26, c. В 01 О 53/1 07.14.77 (prototype). ,