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...

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Problems solved by technology

[0018] In the above two processes using a catalyst that selectively oxidizes hydrogen sulfide to elemental sulfur, the Superclaus process uses an adiabatic reactor. When the concentration of hydrogen sulfide in the gas is high, the selectivity of the catalyst will be affected due to the large heat release of the oxidation reaction. Further reduce the sulfur yield: The Clinsulf-Do process uses an internal cooling tube reactor, which has a complex structure, high cost, and inconvenient adjustment

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