1. A777 SO2 reduction of sulfur recovery catalyst
Sulfur recovery technology is the main principle of selective reduction of SO2 by selective reduction catalyst in hydrogenation reactor to selective catalytic reduction of SO2 to elemental sulfur rather than H2 S, then will produce elemental sulfur sulfur into the liquid storage tank after cooling. The main advantage of this process is:
(1) using specially developed A777 selective reduction catalyst to SO2 reduction for S, solved the shortcomings of the traditional tail gas hydrogenation reactor does not generate the sulfur, improve the efficiency of the one-stage total sulfur recovery unit.
(2) using the selective reduction of catalyst, hydrogenation reactor operating temperature is lower and the actual operating temperature is 160 ~ 200 ℃. Hydrogenation reactor inlet temperature can be controlled in 160 ~ 200 ℃. Therefore need only through the heat exchanger can completely meet the requirements of the reactor inlet temperature, no longer need to use heating furnace, greatly save the energy. Can reduce 30% of H2 consumption.
Can be used to handle only contains all the industrial waste gas such as coal-fired power plant flue gas SO2 discharge gas, acid factory processing
2. A888 H2S selective oxidation of catalyst
A888 H2S selective oxidized sulfur recovery technology is a major breakthrough in the reaction balancing concept of the traditional Claus technology. A888H2S direct oxidation catalyst is adopted to selectively oxidize H2S into sulfurs instead SO2,hence achieving an H2S conversion ratio of 100%.
H2S+ O2 Sx＋H2O (1)
The traditional Claus reaction between H2S and SO2 is a thermodynamic equilibrium reaction which is a process of heat liberation. Further increase of theconversion ratio is restricted by thermodynamic equilibrium.
2H2S+SO2 Sx＋2H2O (2)
The selective oxidation reaction of H2S is a dynamic reaction with a theoreticalconversion ratio of 100%.
3. A918 Alumina type sulfur recovery catalyst
In natural gas purification and sulfur crude oil processing process produce large amounts of H2S gas, in order to protect the environment and recycling sulfur, industrial processing sour gas containing H2S by Klaus technology. A918 sulfur recovery catalyst is mainly used in claus process as catalyst. A918 sulfur recovery catalyst has the characteristics of large porosity, high specific surface area, and has high activity, good thermal stability, strength, low wear rate, resistance to sulfate poisoning, the organic sulfur hydrolysis rate is high, long service life, etc.
4. A958 sulfur recovery catalyst
A958 sulfur recovery catalyst is a new-type sulfur recovery catalyst with a high Claus activity and deoxidization protection features. It can be separately used as a Claus catalyst and may also work together with A918 Al2O3 catalyst for the purpose of deoxidization protection catalysis. In the same device and the same technical conditions, the total sulfur conversion rate can be increased by about 1.7%. It is particularly suitable for sulfur recovery unit with considerable fluctuations in acid gas H2S content and / or flow. A958 catalyst can work with Al2O3 in any converter of the sulfur recovery unit or be filled in a tiered manner across the full bed. During tiered filling and application, A958 catalyst can be deposited on the upper part of the primary converter bed layer, accounting for at least 1/3 of the total volume, So as to protect the lower Al2O3 catalysts from sulfating poisoning by the tiny amount of oxygen existed during the process, or mitigate the poisoning, thus prolonging the life of the catalyst. The excellent performances of A958 catalysts have been proven in industrial applications.
5. A988 TiO2 sulfur recovery catalyst
The A988 Claus catalyst is TiO2 as main active component catalyst, it has good ability of resistance to sulfate. It’s the flag-ship of sulphur recovery catalyst series. The performance is in world leading position. The main advantages of A988 catalyst are :
(1)Owing to high activity of COS and CS2 hydrolysis and Claus conversion almost reaches the thermodynamics equilibrium level, therefore it is one of the best catalyst of sulphur recovery.
(2) It is non-sensitive to the trace O2 in the acid gas and sulfated poison doesn’t exist.
(3) Because A988 catalyst only needs 3s of contact time and can be used in the 1200h-1 GHSV, therefore, the reactor volume can be reduced and in the condition of same contact time, the acid gas loading can be improved greatly.
(4) A988 catalyst is specially applicable to cope with the lean acid gas and Claus tail gas.
Considering the excellent performance of A988 catalysts, it is recommended to use it in the first reactor to promote the full hydrolysis of COS and CS2 and in the second and third reactors to improve Claus conversion rate. A988 catalysts can replace imported catalysts in an imported device. It can also be more extensively used in other domestic sulfur recovery devices.
6. A999G sulphur tail gas hydrogenation catalyst
A999G sulphur tail gas hydrogenation catalyst at low temperature with TiO2 / Al2O3 as the carrier, such as Co - Mo catalyst hydrogenation process for active components, the catalyst has good activity at low temperature (hydrogenation temperature 220 ~ 240 ℃), large specific surface area, large pore volume, active components distribution uniformity, high hydrogenation activity and organic sulfur hydrolysis activity, good activity stability characteristics. For complex organic sulfides have higher conversion ability. Can be used for sulfur compounds of hydrogen sulfide in tail gas hydrogenation is converted to hydrogen sulfide, emissions in order to achieve environmental protection requirement.
COS+H2O=H2S+CO2
CS2+H2O=H2S+CO2
S+H2=H2S
SO2+H2=H2S+H2O
7. A999 sulfur tail gas hydrogenation catalyst
It is a hydrogenation conversion catalyst that has TiO2/Al2O3 as the carrier and Co-Mo as the active components. This catalyst is characterized by high low-temperature activity, high specific surface area, high porous capacity, even distribution of active components, high hydrogenation activity and organic sulfur hydrolytic activity as well as high stability of activity. It is highly effective in the conversion of complicated organic sulfides and can be used to hydrotreat the non-H2S compounds in the sulfur tail gases into H2S, hence satisfying the environment protection standards before tail gas discharges.