SU1310423A1 - Method for removing hydrogen from coke gas - Google Patents

Description

This invention relates to processes for purifying coke oven gas from hydrogen sulphide and can find its application in coke-chemical and chemical industries i, j

.

A known method of purifying gas from hydrogen sulphide by absorption of mice with coco-potash solutions.

The main disadvantage of this method is the low degree of gas purification, O

The closest to the proposed technical essence and the achieved result is a method of cleaning coke oven gas from hydrogen sulfide

These differences make it possible to increase the sulfur content of the absorption solution, not only due to the additional introduction of the oxidizing agent, but above all due to the possibility of using the property of sulfur in the salt of the heavy salt to undergo more complete and deep oxidation under the given conditions.

, and - 0, + 2 S.I

At the same time, inhibition of the thio formation reaction is achieved by the absorption of sodium sulfate with aqueous solution of water, even with a higher solution containing an oxide of a high pH. This allows the cobalt metal phthalocyanine agent to be oxidized.

to tensify the process of absorption of hydrogen sulfide from gas, since the rate of absorption increases with increasing alkalinity. In addition, povpat- with the release of a commercial product.

followed by regeneration of the solution with air purge at

20

25

to tensify the process of absorption of hydrogen sulfide from gas, since the rate of absorption increases with increasing alkalinity. In addition, povpat- with the release of a commercial product.

As a complexing agent, there can be any compound from the class of alkylpolyaminepolycarboxylic acids or their mixture with phosphorus-containing complexones, for example, oxyethylenediphosphonate HEDP or nitrilotriphosphonic NTF acids, but from the point of view of the regeneration rate

20-50 C and pH - 7.8-7.9 to obtain with this elemental sulfur.

However, this method does not completely eliminate the consumption of sulfur for the formation of sodium hyposulphite, as a result of which the yield of sulfur is 90%. In addition, the absorbed solution used does not have a sufficiently high sulfur-holding capacity (1.8 g / l).

The purpose of the invention is to increase the sulfur-capacity of the absorption solution and the solution and the floatability of sulfur. It is better to increase the yield of elemental sulfur, to use ethylenediaminetetraacetic acid.

This goal is achieved by the method of cleaning coke oven gas from sulfur- and hydrogen by absorption by a water mouse with a forging-soda solution containing 35 Hydrogen Sulfur-containing gas, the oxidizing agent, followed by treatment of the absorbent by the subsequent solution of the end solution with air. elemental sulfur, in which a wrought-soda solution is used as an oxidizing agent, 40 containing an oxidizing agent — iron complexant, which is added, based on the ratio of 0.01–0.1 / ion

acid or its salts.

The essence of the method is as follows.

preferably in two steps in the flow at 30-40 ° С “As an absorbent

iron. on liter of solution. The consumption of the absorber for gas washing is determined by

iron complexon in an amount of 0.01-0.1 g-iron ion per liter of solution, and the process is carried out in two stages in the flow mode.

This method makes it possible to increase, depending on the initial content of the sulfur-absorption capacity of the absorption solution, neither hydrogen sulfide in the gas from 1.8 to 6 g / l and to increase the yield of gray-sulfur content of the solution to 3-5 g / l. pH

the absorbent supplied to the purification may be maintained within 7.8-50 9.0.

ry by 8-9%

The selected numerical range of the iron complexonate input is due to the fact that when it is introduced in an amount of less than 0.01 g-ion, the gray content of the absorption solution decreases, with increasing more decant, the absorption solution of 0.1 g-l ion the yield of elemental sulfur is returned to the stage absorption is maintained at the same level and increased. Example. 100 thousand coking the amount of eco gas complexon containing 18 g / m of the family is inexpedient. Hydrogen is subjected to washing. The absorbent saturated with hydrogen sulfide is subjected to regeneration by blowing with air at 30-40 0. Sulfur released

These differences make it possible to increase the sulfur content of the absorption solution, not only due to the additional introduction of the oxidizing agent, but above all due to the possibility of using the property of sulfur in the salt of the heavy salt to undergo more complete and deep oxidation under the given conditions.

, and - 0, + 2 S.I

At the same time, inhibition of the reaction of the formation of sodium thiosulfate is achieved, even at higher pH values. This allows

to tensify the process of absorption of hydrogen sulfide from gas, since the rate of absorption increases with increasing alkalinity. In addition, povpat- with the release of a commercial product.

As a complexing agent, there can be any compound from the class of alkylpolyaminepolycarboxylic acids or their mixture with phosphorus-containing complexones, for example, oxyethylenediphosphonate HEDP or nitrilotriphosphonic NTF acids, but from the point of view of the regeneration rate

solution and floatability of sulfur is better to use ethylenediaminetetraacetic

 Hydrogen sulfide-containing gas is subjected to treatment with an absorbent, followed by using a forging-soda solution containing an oxidizing agent — com-acid or its salts.

The essence of the method is as follows.

 Hydrogen sulfide-containing gas is subjected to treatment with an absorbent followed by a mild-soda solution containing an oxidizing agent — co

preferably in two steps in the flow at 30-40 ° С “As an absorbent

iron. on liter of solution. The consumption of the absorber for gas washing is determined by

decanted, the absorption solution is returned to the stage of absorption, Example. 100 thousand of coke oven gas containing 18 g / m of hydrogen hydrogen is subjected to washing. The absorbent saturated with hydrogen sulfide is subjected to regeneration by air blowing at 30-40 0. The released sulfur

Sew a wrought-soda solution to which an oxidizing agent, iron complexone, ethylenediaminetetraacetic acid (EDTA) acid is added in an amount of 0.1 g iron ion per liter of solution. The content of mildew in solution, in terms of, is 18 g / l. The gas is run in a flow through. In two stages with a solution flow rate of 3 liters per 1 meter of gas. The residual content of hydrogen sulfide in the gas is 0.018 g / m. The solution is regenerated by air blowing, the regeneration time is 0.5 h. The amount of released sulfur is 1690-1691 kg / h, which corresponds to a sulfur yield of more than 99.7%.

Method indicators

 Iron content g-ion / liter in terms of iron

0.005 0.01 0.05 0.1 0.15

Sulfur capacity of solution

sulfur, g / l1,8 2,5 5,2 6,0 6,0

Elemental sulfur yield

from hydrogen sulfide resources

in gas,% 98.2 99.0 99.4 99.75 99.8

Editor I. Segl nick Techredm. Morgenthal Proofreader S. Shekmar

1866/25

Circulation 464 Subscription VNIIPI USSR State Committee

on affairs of inventions and discoveries 113035, Koskva, Zh-35, Raushsk nab., 4/5

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

The table shows the experimental data confirming the optimality of the selected limits of the oxidizing agent - iron complexonate contained in the absorption solution

This invention makes it possible to significantly improve the mouse-soda desulfurization method by increasing the sulfur-absorption capacity of the solution. The proposed method allows to increase the yield of elemental sulfur by at least 8%. The implementation of the method in practice, with a production volume of 20-25 thousand tons per year of sulfur, provides an economic effect in the amount of 150 thousand tons. rub.

Claims (1)

METHOD FOR CLEANING COX GAS FROM HYDROGEN SULFIDE by absorption with an arsenic-soda-water solution 'containing an oxidizing agent followed by regeneration of the saturated solution by blowing with air to obtain elemental sulfur, characterized in that, in order to increase the sulfur intensity of the absorption solution and increase the yield of elemental sulfur, iron complexonate is used as an oxidizing agent in an amount of 0.010.1 g-iron ion per liter of solution, and the process is carried out in two steps, neither in the forward flow mode. § 1 1310423