RU1837947C - Method for gas desulfuration - Google Patents

Description

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The invention relates to the chemistry of inorganic sulfur compounds, and more particularly, to a method for the catalytic purification of gases from sulfur compounds by reacting hydrogen sulfide and sulfur dioxide with the formation of elemental sulfur with the possible presence of carbon sulfide and water vapor in the initial mixture. Carbon sulfide is hydrolyzed on the same semi-functional catalyst, and the resulting hydrogen sulfide is converted to sulfur.

The purpose of the invention is to increase the productivity of the catalytic gas purification method from sulfur compounds by reacting sulfur dioxide with hydrogen sulfide according to the Klaus reaction to produce elemental sulfur and stabilizing the process performance when there are oxygen impurities in the processed sulfur-containing gases.

The specified goal, according to the invention, is achieved by the fact that the processing of gases containing HaS, S02, COS, water vapor is carried out at temperatures of 200 - 350 ° C on catalysts containing, wt.%: V205.5-20

Calcium and / or aluminum sulfite or calcium and magnesium. 2-80

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The process is insensitive to oxygen impurities in the gases being treated.

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The catalyst is used in the form of cylindrical granules, rings and honeycomb blocks.

The catalyst of the method of the invention is prepared by simultaneously mixing titanium dioxide powders, including hydrated, calcium sulfate and / or aluminum or calcium and magnesium sulfates, or compounds of these elements, which, when reacted with sulfuric acid, give the corresponding sulfates in situ, an aqueous solution of vanadium salt or a powder of vanadium salt and water, followed by molding into cylindrical granules, rings and honeycomb blocks, drying at room temperature for 10-15 hours and calcining at 450-500 ° C to form active stable and stable vanadium-titanium compounds. In the case of using aluminum hydroxide, the calcined catalyst is sulfated in the reaction mixture at 250-400 ° C.

Thus, the hallmarks of the proposed method from the prototype are:

the use of a vanadium-titanium catalyst composition, wt.%: 5-20 VaOs, 2 - 80 sulfates of calcium and / or aluminum or calcium and magnesium, the rest -TI02 use of the catalyst in the form of rings and honeycomb blocks, which provides low hydraulic resistance of the catalyst layer .

Example. The processing of mixtures containing sulfur compounds was carried out in a fixed bed reactor.

Tests were carried out on a catalyst fraction of 3-4 mm, with varying space velocity, temperature and mixture composition. The composition of the final and initial mixture was analyzed by gas chromatography. Comparison of the catalysts according to the methods of the invention and the prototype was carried out under the same conditions.

A comparison of the sulfur productivity of the proposed method and the short-term prototype was given at a temperature of 200. 250 and 350 ° C, a space velocity of 72,000 h, in a fraction of 3-4 mm and the initial mixture containing,%: HaS, COS, S02, the rest is inert gas. The table presents

specific conditions of examples of sulfur performance values of the proposed method and prototype method.

As can be seen from the above examples, the proposed method for the catalytic purification of gases from sulfur compounds by the interaction of hydrogen sulfide with sulfur dioxide while the COS hydrolysis proceeds allows increasing productivity

sulfur, due to the use at temperatures of 200-350 ° C of a catalyst containing vanadium pentoxide, titanium dioxide and calcium and / or aluminum sulfate or calcium and magnesium at the specified ratio of components.

The method of the invention provides high stable sulfur productivity in the presence of oxygen impurities in the processed sulfur-containing gases, since

the method is insensitive to oxygen impurities.

The proposed method provides a low hydraulic resistance of the catalyst bed due to the use of the catalyst in the form of special shaped elements. The shaped elements of the catalyst of the method of the invention (cuttings, rings and blocks) have a sufficiently high mechanical strength.

Claims (2)

1. The method of purification of gases from sulfur compounds to obtain elemental sulfur, including the transmission of the source gas at 200-350 ° C through a catalyst containing titanium dioxide and calcium sulfate, and / or aluminum, or magnesium, characterized in that, in order to increase the productivity of the process, the latter is carried out on a catalyst additionally containing vanadium pentoxide in the following ratio of components. , wt.%: vanadium pentoxide 50-20; calcium sulfate, and / or aluminum, or magnesium 2 - 80; titanium dioxide else. 2. The method according to p. 1, characterized in that, in order to reduce hydraulic resistance, the catalyst is used in the form of rings or cuttings.