SU1449152A1 - Method of cleaning a gas from hydrogen sulphide - Google Patents

Abstract

The invention relates to the purification of gases from hydrogen sulfide with a solution based on iron hydroxide, followed by regeneration of the spent absorber. To improve the efficiency of the process by reducing the consumption of reagents and increasing the yield of toner production, the gas before purification, 3, 3; One piece

Description

SP

Yu

114

The invention relates to the field of gas purification from hydrogen sulphide and can be used in gas, oil and chemical industry.

The purpose of the invention is to increase the efficiency of the gas purification process from hydrogen sulfide by reducing the consumption of absorbent material and increasing the yield of marketable products.

Example 1. Cleaning is subjected to gas in the amount of 5000 m / h with a concentration of hydrogen sulfide of 10% by volume and. carbon dioxide 90% by volume. To convert the hydrogen sulfide into sulfur dioxide, 2000 m / h of the gas mixture is burned in the presence of oxygen, for which 3571 m of air are supplied to the system, and 956 kg / h of iron hydroxide suspension in water are treated with 3000 m / h.

The resulting sulfur dioxide dioxide in the amount of 572 kg is mixed with an aqueous solution containing 785 kg of iron sulfide and 142 kg of elemental sulfur in the presence of oxygen at normal temperature (air quantity is 3571 m).

From the resulting mixture, 285 kg of elemental sulfur are separated, and the remaining ferrous sulfate solution is treated with ammonia in the amount of 304 kg, 1,356 kg of ammonium sulfate, which is a marketable product, and 956 kg of ferric hydroxide, which is returned to the beginning of the process, are obtained. .

Example 2. A gas containing hydrogen sulfide and carbon dioxide is divided into two parts. One of the parts (3/5) is treated with a solution of iron hydroxide, as a result of which iron sulfide and sulfur are obtained. Another part (2/5) of the gas is burned in a laboratory furnace and sulfur dioxide is produced. The resulting products are combined to form elemental sulfur, ferrous sulfate, and carbon dioxide. Elemental sulfur and carbon dioxide were extracted from the system as a commodity, and iron sulfate solution was treated with ammonia in the presence of oxygen, and iron hydroxide and ammonium sulfate were obtained, which was removed from the system as a commercial product.

duct

The test results are shown in the table (the volume of sample taken is 500 ml)

22

The consumption of the absorbent (hydroxide of the iron) is reduced due to the fact that only 3/5 of the main gas stream is directed to the hydroxide treatment, i.e. if the treatment is carried out by a known method, then 1593 kg of iron hydroxide will be required, whereas in the proposed method 956 kg is sufficient (example 1).

In a known method, a suspension of iron hydroxide and elemental sulfur is formed during the regeneration. When carrying out the process of photoproduction of sulfur, up to 15% of iron hydroxide, i.e. In the process it is constantly necessary to introduce new portions of iron hydroxide to compensate for these losses. In addition, iron hydroxide contaminates sulfur, reducing its quality.

In the proposed method, the regeneration is carried out in such a way that not only the iron hydroxide is completely returned to the purification stage, but also, in addition to sulfur, an additional commercial product is obtained - ammonium sulfate. It was established that as a result of the process, ammonium sulfate, elemental sulfur, and carbon dioxide are obtained as marketable products from acid gases containing hydrogen sulfide and carbon dioxide.

Formulas

acquisitions

The method of purification of gas from hydrogen sulfide by contacting it with a suspension of iron hydroxide in water, followed by regeneration of the spent absorber, characterized in that, in order to increase the efficiency of the process by reducing the consumption of reagent and increasing the yield of commercial products, the gas is cleaned into two streams before cleaning in the ratio of 2: 3, the first of which is burned in the oxygen of the air, the second is supplied to contact with a suspension of iron hydroxide, and the products formed after burning and contact are mixed in the presence of Air oxygen is extracted from the mixture and ferrous sulfate is treated with ammonia solution to produce ammonium sulfate and iron hydroxide, which is returned to the purification step.

10 90300 200 0.0894 0.8840.042 0.115 0.093

20 80300 200 0.188 0.7850.084 0.231 0.187

5 95300 200 0.048 0.9330.021 0.058 0.047

Editor V. Petrash

Composition

Tehred A. Kravchuk Proofreader I. Muska

. Order 6899/7

Circulation 642

VNIPPI State Committee on Inventions and Discoveries at the State Committee for Science and Technology of the USSR 4/5, Moscow, Zh-35, Raushsk nab. 113035

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

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Claims (1)

Claim A method of purifying gas from hydrogen sulfide by contacting it with a suspension of iron hydroxide in water, followed by regeneration of the spent absorber, characterized in that, in order to increase the efficiency of the process by reducing the consumption of the reagent and increasing the yield of commercial products, the gas before cleaning is divided into two streams with respect to 2: 3, the first of which is burned in oxygen, the second is fed into contact with a suspension of iron hydroxide, and the products formed after combustion and contact are mixed in the presence of oxygen and air, is isolated from the resulting mixture ferric sulfate, it is treated with ammonia to obtain an ammonium sulfate, and ferric hydroxide, which is recycled to the purification stage. 1449152 ------ _η . Number, Gas composition Consumption ^! Received substance, g /about ml of gas supplied to on the eyes _; from ₂ S (Νΐφ ₂ so ^ Fe (0H) _{5 H?} S 1 1 l / 1 o 1 o 1 1 stock, g Fe (0H) ₃ clean- | squeeze genius _______ 10 90 300 200 0,094 0.884 0.042 0.115 0,093 20 80 300 200 0.188 0.785 0.084 0.231 0.187 5 95 300 200 0,048 0.933 0.021 0.058 0,047