The preparation method of catalyst for the oxidation of sulfur dioxide

 

The invention relates to the field of chemistry inorganic substances and the production of mineral fertilizers, in particular can be used in the synthesis of sulfuric acid. The described method of preparation of the catalyst the conversion of SO2in SO3including mixing solutions of the active components with powder silica carrier, forming and heat treatment, characterized in that the first silica carrier is impregnated with sulfuric acid in a weight ratio of from 1:0.5 to 1:1.2 and then mixed with solutions of Vanadate and potassium liquid glass, which improves the distribution of the active component in the volume of the catalyst and increases its dispersion. The technical result is improved performance of the catalyst, in particular strength and activity, at low 420oWith temperatures. Enhanced waste, provides highly reproducible product quality. 1 C.p. f-crystals, 1 table.

The invention relates to the field of chemistry inorganic substances and the production of mineral fertilizers and can be used in the synthesis of sulfuric acid.

There is a method of preparation of the catalyst the conversion of SO2in SO3that includes recip, idle glass and sulfuric acid. The catalyst slurry containing about 80% water, dried, and the obtained catalyst powder to prepare a paste for forming the mixture of the powder with water. The formed catalyst is dried and calcined (Patent RU 2174442. Bull. 28 2001) "preparation Method of catalyst for the oxidation of sulfur dioxide".

The method allows to obtain a catalyst with good dispersion of the active component, is uniformly distributed in the volume of the product. However, energy-intensive process - it is necessary to evaporate about 5 tons of water per 1 ton of catalyst, and a multi-stage process leads to non-repeatable quality of the catalyst, which is the main disadvantage of this method.

Closest to the invention to the technical essence is "a Method of preparation of the catalyst for oxidation of sulfur dioxide" (A. C. SU 1558463 A1. Bull. 15, 1990). The method includes mixing a silica carrier with an alkaline promoter and vanadium pentoxide. Then to the resulting mass is successively added sulfuric acid and the solution Kremenets with the subsequent forming, drying and calcination. The method allows to obtain a weight for forming catalyst at the stage of mixing the components, excluding the stage of drying catalizatorului component of vanadium pentoxide with dispersion, sufficient for particle diffusion in the micropores of units of media. In addition, the necessity of using in the way of highly concentrated solutions of Kremenets reduces the effectiveness of Zola SiO2because the dispersion of globules concentrated crematory low, aboutroughly the size of micropores of units of media. These features of the method does not allow to obtain a vanadium pentoxide high dispersion and do not provide uniform distribution of the active component in the volume of catalyst that is significant disadvantages of the method.

The technical problem to obtain a catalyst with a uniform distribution of the active component in volume at high dispersion of vanadium pentoxide, providing the activity and durability of the catalyst, is solved by following a number of technological methods, namely the method of preparation of the catalyst for oxidation of sulfur dioxide includes the impregnation of silica gel, for example, precipitated with sulfuric acid in a weight ratio of from 1:0.5 to 1:1.2 and the subsequent mixing of the impregnated carrier with a mixture of alkaline solutions of active ingredients, preferably containing the oxides, g/l: V2O5- 50-150; t and calcined.

The impregnation of a silica carrier with sulfuric acid leads to the penetration of the acid into the micropores of units of media. Thus the acid-soaked powder white soot remains loose and can easily be fed into the mixer auger dispenser.

A mixture of solutions of active ingredients is prepared in such a way as to satisfy at least two conditions: molar ratio of K2O:Na2O:V2O5should be as 2,5-3,2: 0,8-1,5: 1; concentration of the mixture of active solutions must ensure the introduction of the 3.5-10 wt.% V2O5in the catalyst and humidity mass for forming 36-48%; stage mixing impregnated with sulfuric acid silica carrier and a mixture of alkaline solutions is carried out in the mixer, batching both streams in order to maintain the molar ratio of sulfur trioxide to the sum of the oxides of potassium and sodium in the range of 1.7-to 2.1.

A significant difference method: the reaction of neutralization in the pores of the aggregates carrier that provides uniform distribution of vanadium pentoxide in the volume of the catalyst. In addition, the neutralization process is formed the polysilicon acid, which promotes dispersion of particles of vanadium pentoxide, hindering the diffusion of the first the m SiO291% and add 75 ml of sulfuric acid 92 wt.%. After stirring up odnorodnogo state, about 20 min, add 320 ml of a mixture of aqueous solutions of Vanadate and potassium liquid glass containing, g/l: V2O5- 87;2O - 138; Na2O - 27; SiO2- 175. After stirring receive catalyst mass to a moisture content of 43 wt.%, which is formed by extrusion, the extrudates are dried and calcined for 1.5 hours at 520oC. the resulting catalyst, the molar ratio of K2O: Na2O: V2O5as 3,07:0,92:1 and SO3:(K2O+Na2O)=2,0. Properties of the catalyst are given in the table.

Example 2. In the mixer load 270 g of white powder of carbon black impregnated with sulfuric acid, in a weight ratio of SiO2to H2SO41:0,8, and add with stirring, 300 ml of a mixture of aqueous solutions of Vanadate and potassium liquid glass containing, g/l: V2O5- 92;2O - 145; Na2O - 30; SiO2- 183. Catalyst mass to a moisture content of 42.7 wt. % form extrudates are dried and calcined as in example 1. The molar ratio of K2O:Na2O:V2O5=3,05: to 0.96:1 and SO3:(K2O+Na2O)=2,01. Properties of the catalyst are given in table.

Claims

1. Sposob with silica carrier, molding, drying and calcination, wherein the first silica carrier is impregnated with sulfuric acid in a weight ratio of from 1:0.5 to 1:1.2 and then add a mixture of alkaline solutions of active ingredients.

2. The method according to p. 1, characterized in that the mixture of alkaline solutions of active ingredients contains, g/l: V2O5- 50-150;2About 100-200; Na2O - 10-50; SiO2- 100-300.

 

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