SU1722543A1 - Method of cleaning gas from hydrogen sulfide - Google Patents

Description

The invention relates to the purification of gas from hydrogen sulfide and can be used for the purification of biogas in livestock farms, as well as in the chemical, metallurgical and other industries.

The purpose of the invention is to provide effective purification of gas containing carbon dioxide with a concentration of hydrogen sulfide up to 1 vol. % An example. Single-stage purification of biogas containing carbon dioxide and NgZ of 0.42% by volume at a flow rate of 2.08 m3 of biogas per 1 hour is carried out in a spherical reactor with a working volume of 100 liters of solution. Bmogaz bubbling pass into the lower part of the reactor. Purification is stopped when the content of H2S in the purified gas increases to 0.1 vol.%. The regeneration of the solution is carried out in the same apparatus by bubbling

passing air through the solution at a flow rate of 1.0 m3 / h.

Regeneration is stopped when the degree of quinone regeneration

Schinona

+ cr

reaches 0.99.

Schinona f hydroquinone

To purify biogas, a quinone solution with a concentration of 1.0% (.10 g / l) at pH 4.0 is used.

Results of biogas purification: HaS absorption time (until the content in purified biogas is equal to 0.1% by volume) 600 min; the volume of biogas purified in the specified time, 20,800 liters; the composition of the regenerated solution,%: quinone 70, hydroquinone 30; regeneration time 200 min.

Similarly, a series of experiments was carried out with other parameters.

Purification of biogas at pH 3.5 and a quinone concentration of 0.8 wt.%: Absorption time

%one

you ate

4X CJ

HaS (until the content in the purified biogas is 0.1 vol.%) 570 min; the volume of biogas purified in the specified time, 19200 l; composition of the regenerated solution,%: quinone 66, hydroquinone 34, regeneration time 190 min.

Purification of biogas at pH 4.5 and a concentration of quinone 0.8 May. %

HaS absorption time (until the content in the purified biogas is equal to 0.1 vol.%) Is 560 min; the volume of biogas purified in the specified time, 18,930 liters; composition of the regenerated solution,%: quinone 72. hydroquinone 28, regeneration time 220 min.

In order to obtain comparative data in the same reactor, a single-stage purification of the same biogas is carried out with a solution of disodium salt anthraquinone- (2,6) -disulfonic acid.

Baseline data and results of comparative experiments are given in Tables 1, 2,

The low absorptive capacity of the solution in the prototype method (the difference in HsS absorption time) is explained by the following factors; low anthraquinone oxidation potential (Е ° - + 0.156 V), unfavorable for

oxidation by the value of the solution (pH 9, alkaline medium), a low concentration of carbonyl oxidation groups (2.4 mol / 100 l of solution).

Claims (1)

The increase in regeneration efficiency is explained by the different composition of the solutions being regenerated (65% is restored compared to 30% of the reducing agent in the proposed method), reduction of the oxidizing ability of oxygen at a solution pH of 9, kinetic difficulties in the interaction of large anthraquinone molecules with atmospheric oxygen. Claims A method for purifying a gas from hydrogen sulphide, including oxidizing it to elemental sulfur with an aqueous absorption solution containing quinone, followed by regeneration of the saturated absorption solution by air blowing, characterized in that in order to ensure effective purification of gas containing carbon dioxide at a hydrogen sulfide concentration of up to 1 %, quinone is used at its concentration in a solution of 0.8-1.0 wt.%, and the oxidation is carried out at a pH of 3.5-4.5. Table Table 2