CS268269B1 - Aulian Removal Process from Gas - Google Patents

Abstract

The solution consists in adding to the washing solution of chelated iron salts osmotic salts in an amount of up to 5 g/l and/or aldehydes and carbon numbers 1 to 3 in an amount of up to 1.10“' to 55 s/l.

Description

The present invention relates to a process for removing sulfane from a gas by the action of a shut-off solution of chelated iron salts.

In the removal of sulfane from gases, the use of aqueous solutions with chelated iron salts has found very wide application. In the removal of sulfane by means of these solutions, the absorption of sulfane in alkaline solution takes place in the first phase with the formation of hydrogen sulfide, and in the following phase the reaction between the complexed iron salt and hydrogen sulfide ions takes place. For example, using the tetrasodium salt of ethylenediaminototraootic acid EDTA, this reaction is carried out (Fe ³⁺ EDTA ⁴ "/ + H ₂ SO ₄ - 2 / Fe ²⁺ EDTA ⁴ / + S + H 2 O").

For converting the reduced form of the wash solution back to the active form / Fe-EDTA ^{+ 4} "/ ^_ able to scrub hydrogen sulphide is utilized by oxidation with oxygen rovnioei 4 / Fe ²⁺ EDTA ^4- / ^2" + 4 H + + O * 02-4 ( Fe ³⁺ EDTA ⁴ / + 6 H 2 O. To ensure the correct and optimal function and efficiency of the shut-off solution, it is necessary to keep the pH of the washing solution between 7 and 9 by the addition of buffering agents. 9 to 10 are no longer selective for sulfane and also wash out carbon dioxide.

The disadvantage of this process is that the sulfur formed is very ferrous and sticky. It therefore clogs machinery and pipelines in the form of deposits and stickers.

Said drawbacks are solved by the method of removing sulfane from a gas by the action of a tripping nozzle of chelated iron salts according to the invention. Its essence lies in the fact that copper salts are added to the switch-off nozzle in an amount of up to 5 g / l and / or aldehydes -7 with a number of carbons 1 to 3 in an amount of from 1.10 to 55 g / l.

The main advantage of the process according to the invention is that the sulfur released is not as fine-grained and therefore does not significantly clog the desulfurization device. Sulfur filtration is therefore also easier.

The process according to the invention is described in more detail below with reference to several embodiments.

Example 1.

The gas containing 5 g / l of sulfane was desulfurized with a solution of 0.12 mol / l of EDTA, 0.09 mol / l of Fe and 60 g / l of NaHCO 3. Washing was performed at 35 ° C and the final sulfane content was 40 mg / m 2. The reduced form of the wash solution was oxidized back to the active form with air.

Example 2

The biogas containing 6 g of sulfane / ml was desulfurized with the solution described in Examples 1 at 40 DEG C., to which 2 g of copper sulfate / 1 solution was added. The final sulfane content was 40 mg / m2.

Example 3

The biogas containing 6 g of sulfane / ml was desulfurized with the solution described in Example 1 at 45 DEG C. to a final content of 40 mg of sulfane in ml by adding 5 g / liter of formaldehyde to the switch-off solution. The desulfurized biogas was further burned in a boiler.

Example 4

A gas containing 4 g of sulfane per ml was desulfurized with the solution described in Example 1, to which 1.5 g of copper sulfate and 0.8 g of acetaldehyde were added. The final concentration of sulfane in the gas after washing was 50 mg per ml. The desulfurized gas was used to drive the internal combustion engine.

Claims (1)

OBJECT OF THE INVENTION A process for removing sullanate from a gas by the action of a scrubbing solution of chelated iron salts, characterized in that tin salts are added to the scrubbing solution in an amount of up to 5 g / l and / or aldehydes with a carbon number of 1 to J in an amount of 1.10 up to 55 g / l.