The catalyst for the separation of sulphur from gases and the method of its preparation

 

(57) Abstract:

Use: catalyst for the separation of sulphur from gases and the method of its preparation. The essence of the invention: preparation of ceramic honeycomb catalyst carrier is impregnated with a solution mixture of salts of iron and copper or manganese. Then dried and calcined. Get the catalyst with Sbeats85-120 m2/g of the following composition, wt. Al2O3the 13.4-21,6, SiO267,1-78,7, Fe2O30.5-5 oxide Cu or Mn of 2.5-10. Ceramic honeycomb carrier is prepared by using as a binder aerosoles in the amount of 40-60 wt. received by the freezing of aerosol at 0-(-25)C, followed by thawing and drying at 50-120C. 2 C. p. F.-ly, 3 tables.

The invention relates to methods of separation of sulphur from serosoderjaschei gases by the reaction of the direct oxidation of hydrogen sulfide into sulfur and may find application in the extraction of sulfur in the gas, chemical and oil industry.

Known catalyst for gas-phase oxidation of hydrogen sulfide to sulfur [1] consisting of oxides of aluminum, magnesium and titanium.

The main disadvantage of this catalyst is that it proceeds in a reversible reaction between sulfur and n] contain the oxides of titanium, iron, chromium and zinc.

This catalyst is very expensive due to the high content of non-ferrous metals (zinc, and chromium), and insufficient in the presence of small (up to 10 wt.) quantities of water vapor in the gases.

Closest to the proposed substance and effect is achieved is a catalyst containing 11,1 23.5 wt. iron oxide deposited on a silica-alumina porcelain media composition, wt. aluminum oxide 22,4-24,0; magnesium oxide 0,59-0,62; calcium oxide 0,66-0,73; potassium oxide of 0.3-0,40; sodium oxide 0,23-0,25; silica rest. The catalyst is prepared by impregnation of the carrier with an aqueous solution of nitrate of iron, evaporation, drying and calcination. For preparation of the carrier a mixture of powders of fine grinding (sieve residue 0.06 mm 3-5%), which is composed of kaolin, clay and quartz sand, mixed with small amount of water, mix thoroughly until a paste-like state; the resulting paste is formed into cylinders with a diameter of 2.5 mm and a height of 3 mm, which is dried in air at 120aboutC for 14 h, and then calcined in air for 30 hours at 1200aboutC.

The main disadvantages of this catalyst a small specific surface area, the value of which does not exceed 2 m2g, and net of the invention is to increase the selectivity of the catalyst in the oxidation of hydrogen sulfide to sulfur in wet gas mixtures and a significant increase in specific surface area (up to 110 m2g). This goal is achieved by the use of a catalyst of the following composition, wt. Al2O3the 13.4-21,6 SiO267,1-78,7 Fe2O30.5-5 Oxide Cu or Mn 3-5 and method of its preparation.

For the preparation of the catalyst inert block carrier of honeycomb structure with high surface area (at least 100 m2/g) derived from inorganic binder aerosoles. Forming a monolithic honeycomb carrier is made by the extruding aerosoles through appropriate filters. To ensure a high specific surface cell media use aerotravel obtained by compaction of Aerosil in water at a temperature of 0-(-25)aboutC. the Pressure molding is 40-120 kg/cm2the drying is carried out at 30-40aboutC for 15-20 h, then at 100aboutC for 1 h and then at 950aboutC for 1-20 hours Received cellular carriers have good strength, high specific surface area and porosity.

The active ingredient is applied by impregnation cellular carrier corresponding salts followed by drying and calcination. Specific surface area of the proposed catalyst is not less than 85 m2/,

P R I m e R 1. Aerosil grades a-300 is mixed with water in the ratio of solid to 60 wt. water 40 wt. The resulting mixture is stirred in a mixer for 1.5 hours the resulting aqueous suspension is frozen at a temperature of -25aboutC, then thawed and dried at 100aboutC for 5 h

The obtained powder aerosoles mixed with kaolinite in a 1:1 ratio, add water and subjected to plasticization in the Z-shaped mixer. The resulting mass is formed into honeycomb monolithic blocks, which are then dried at 40aboutC for 15 h, then at 100aboutC for 2 h and calcined at 950aboutC for 2 h

Blocks with a honeycomb structure impregnated by capacity (0,41 g/g) with a solution of a mixture of nitrates of iron and copper in an atomic ratio of metals of 1:1) dried at 100aboutC for 2 h and calcined at 450aboutWith over 2 hours of Characteristics of the catalysts obtained in examples 1-7 are shown in table. 1, the results of the study of catalytic properties in the reaction of direct oxidation in the table. 2 and 3.

P R I m m e R 2. Similar to example 1, different content of aerosoles in the media.

P R I m e R 3. Similar to example 1, different content of aerosoles in the media.

P R I m e R 6. The catalyst prepared according to the prototype shown for comparison.

The catalytic activity of the samples in the reaction of direct oxidation of hydrogen sulfide to sulfur examined in a flow reactor at a fraction of 0.25-0.5 mm at a temperature of 250aboutWith time and contact 0,35 C. the Composition of the initial reaction mixture, about. hydrogen sulfide 3; oxygen 1,5; helium else. When conducting the reaction in the presence of water vapor (about 35.) the content of hydrogen sulfide and oxygen is 2 to 1 and about. respectively.

A comparative study of the catalytic properties of the proposed designs catalysts (examples 1-5) and the sample prepared according to the prior art (example 6), show that the proposed designs have higher activity and selectivity in comparison with the known, especially in the presence of water vapor (table. 3), when the output of sulfur on the proposed catalysts are several times higher than known. The value of specific surface area of the proposed catalysts ten times greater than the surface area of a known catalyst. An important advantage of the proposed catalyst is a honeycomb structure, which allows the processing is atore, as well as high dust acidic gases, which is especially important when processing metallurgical gases.

1. The catalyst for the separation of sulphur from gases by direct oxidation of hydrogen sulfide to sulfur containing iron oxide and ceramic-based media oxides of aluminum and silicon, characterized in that it additionally contains copper oxide or manganese oxide in the following ratio, wt.

Al2O313,4 21,6

SiO267,1 78,7

Fe2O30,5 5,0

Oxide Cu or Mn 2,5 10,0

and has a surface 85-120 m2/g, while the ceramic carrier made in the form of a block having a honeycomb structure.

2. The method of preparation of the catalyst for the separation of sulphur from gases by direct oxidation of hydrogen sulfide, comprising preparing a ceramic carrier using a binder, the impregnation of the finished carrier active components, subsequent drying and calcination, wherein the ceramic carrier is made in the form of a block having a honeycomb structure, at the same time as the binder used aerotravel in the amount of 40-60 wt. received by the freezing of aerosol at 0 (-25)oWith subsequent thawing and drying at 50-120o2/g of the following composition, wt.

Al2O313,4 21,6

SiO267,1 78,7

Fe2O30,5 5,0

Oxide Cu or Mn 2,5 10,0

 

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3 cl, 2 tbl, 18 ex

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1 tbl

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