Catalyst for selective oxidation of sulfureted hydrogen into elemental sulfur and reaction process thereof

Abstract

A selective oxidation catalyst and process which converts the hydrogen sulphide into the element sulphur, wherein, the catalyst comprising a catalyst carrier and active components which are selected from the trioxide iron and / or trioxide chromium is characterized in that the carrier is the mixed oxides of the titanium dioxide and aluminum sesquioxide, in which the content of the titanium dioxide is 60-95%. The catalyst is used in the reaction which selectively oxidizes the mixed gas containing the hydrogen sulphide into the element sulphur. Reaction conditions are as follows: reaction temperature is 160-280 DEG C, reaction pressure is 0.02-10.0MPa, gas space velocity is 400-2000h<-1>, H2S is less than or equal to 3.0% (Vol%), the molar ratio of O2 and H2S is 0.6-3.0. The catalyst shows excellent activity at low temperature and has selective oxidation activity at 160 DEG C. The yield of the sulfur is high and is more than or equal to 90%.

Description

technical field

[0001] The invention relates to a catalyst and a reaction process for selectively oxidizing hydrogen sulfide into elemental sulfur. Background technique

[0002] Among the process technologies for treating sulfur-containing industrial gases, the well-known technology is the Claus process. i.e. using H 2 Partial combustion of S to form SO 2 , and then with the remainder of the H 2 S performs a Claus reaction. The specific chemical formula is as follows:

[0003] h 2 S+3 / 2O 2 → SO 2 +H 2 o

[0004] 2H 2 S+SO 2 →3 / n Sn+2H 2 o

[0005] Since the Claus reaction is limited by thermal equilibrium, H 2 The S conversion rate is not high, and multi-stage conversion is required. At present, the highest H in the three-stage Claus device 2 S conversion rate ≤ 98%, the tail gas still contains 1-3% H 2 S. In addition, as the development of coal chemical industry tends to be large-scale, the decarbonization and desulfurization process mostly adopts technolog...

Examples

Embodiment 1

[0035] Wash industrial metatitanic acid with deionized water to ensure that (SO 4 ) -2 ≤0.1%, dried at 120°C for 4 hours, crushed to 180 mesh. Get above-mentioned 160g of metatitanic acid and 40g of industrial activated alumina powder and 4g of turnip powder and mix evenly. Weigh 24.3g (NH 4 ) 3 Fe(·C 6 h 5 o 7 ) 2 and 5.4g Cr 2 (C 2 o 4 ) 3 4H 2 O, dissolved in distilled water, with HNO 3 After adjusting the pH value of the solution to 4-5, add it to the above powder and stir, knead, extrude into a Φ4.0mm columnar shape, dry naturally at room temperature for 8 hours, dry at 120°C for 2 hours and roast at 450°C for 4 hours. The catalyst sample A was obtained. Its chemical composition is: TiO 2 81.2% (m / m), containing iron, 8.1% chromium oxide, the measured specific surface area of ​​the sample is 128m 2 / g, crushing strength 134N / cm, activity results are shown in Table 1.

Embodiment 2

[0037] The catalyst prepared in Example 1 is broken into 20 mesh-10 mesh particle size, and 10ml of sample is packed into a stainless steel reactor with an internal diameter of Φ18mm, and a layer of quartz sand with a thickness of 4cm is placed on it to ensure that the reactor is evenly mixed and reacted. The inlet gas contains H 2 S1% (V), O 2 0.8% (V), H 2 O10% (V), the rest is N 2 . The activity of the catalysts was evaluated using a small laboratory setup.

[0038] All tests are carried out under typical conditions of 180, 200, 220, 240°C and 2000h-1 high space velocity. Gas volume composition H 2 S: 1.0%, CO 2 :98,O 2 :0.8%. h 2 S conversion rate η H2s %, selectivity S s % and sulfur yield S% are calculated as follows:

[0039]

[0040]

[0041]

technical field

[0001] The invention relates to a catalyst and a reaction process for selectively oxidizing hydrogen sulfide into elemental sulfur. Background technique

[0002] Among the process technologies for treating sulfur-containing industrial gases, the well-known technology is the Claus process. i.e. using H 2 Partial combustion of S to form SO 2 , and then with the remainder of the H 2 S performs a Claus reaction. The specific chemical formula is as follows:

[0003] h 2 S+3 / 2O 2 → SO 2 +H 2 o

[0004] 2H 2 S+SO 2 →3 / n Sn+2H 2 o

[0005] Since the Claus reaction is limited by thermal equilibrium, H 2 The S conversion rate is not high, and multi-stage conversion is required. At present, the highest H in the three-stage Claus device 2 S conversion rate ≤ 98%, the tail gas still contains 1-3% H 2 S. In addition, as the development of coal chemical industry tends to be large-scale, the decarbonization and desulfurization process mostly adopts technolog...

Examples

Embodiment 1

[0035] Wash industrial metatitanic acid with deionized water to ensure that (SO 4 ) -2 ≤0.1%, dried at 120°C for 4 hours, crushed to 180 mesh. Get above-mentioned 160g of metatitanic acid and 40g of industrial activated alumina powder and 4g of turnip powder and mix evenly. Weigh 24.3g (NH 4 ) 3 Fe(·C 6 h 5 o 7 ) 2 and 5.4g Cr 2 (C 2 o 4 ) 3 4H 2 O, dissolved in distilled water, with HNO 3 After adjusting the pH value of the solution to 4-5, add it to the above powder and stir, knead, extrude into a Φ4.0mm columnar shape, dry naturally at room temperature for 8 hours, dry at 120°C for 2 hours and roast at 450°C for 4 hours. The catalyst sample A was obtained. Its chemical composition is: TiO 2 81.2% (m / m), containing iron, 8.1% chromium oxide, the measured specific surface area of ​​the sample is 128m 2 / g, crushing strength 134N / cm, activity results are shown in Table 1.

Embodiment 2

[0037] The catalyst prepared in Example 1 is broken into 20 mesh-10 mesh particle size, and 10ml of sample is packed into a stainless steel reactor with an internal diameter of Φ18mm, and a layer of quartz sand with a thickness of 4cm is placed on it to ensure that the reactor is evenly mixed and reacted. The inlet gas contains H 2 S1% (V), O 2 0.8% (V), H 2 O10% (V), the rest is N 2 . The activity of the catalysts was evaluated using a small laboratory setup.

[0038] All tests are carried out under typical conditions of 180, 200, 220, 240°C and 2000h-1 high space velocity. Gas volume composition H 2 S: 1.0%, CO 2 :98,O 2 :0.8%. h 2 S conversion rate η H2s %, selectivity S s % and sulfur yield S% are calculated as follows:

[0039]

[0040]

[0041]

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