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Cobalt - molybdenum catalyst temperature after curing, when connected to the feed gas, are accompanied by over-temperature phenomenon, which not only caused the catalyst thermal aging, but also destroyed part of the active ingredient to make the catalyst sublimation, greatly reducing the cobalt - life molybdenum catalyst. Through several years of exploration, in cobalt - molybdenum-based catalysts when the temperature vulcanized or secondary sulfide 接气 note the following: 

 

(1) a cobalt - molybdenum sulfide catalyst at the end of heating, the temperature of the catalyst bed is reduced to about 300 ℃, should not be too high. 

 

(2) a cobalt - molybdenum-based catalyst at the end of the vulcanization temperature, during the cooling of the catalyst to increase the emissions of nitrogen, to increase the supply of fresh nitrogen so that the furnace excess CS2 conversion is carried out of. 

 

(3) transform raw gas furnace at the same time then, generally immediately added a sufficient amount of high-pressure steam, but also to ensure adequate H2S content, to prevent the occurrence of anti-sulfide occurrence. In addition, when converting furnace 接气 should also maintain pressure 接气, to control the vent valve opening, to guarantee a certain amount of gas venting, while adjusting the conversion furnace inlet gas temperature. 

 

(4) when changing the furnace temperature of the catalyst bed temperature exceeds a normal time, the gas system can be increased to increase the amount of venting the system, so that the flow rate of the gas to increase the converting furnace, the furnace excess calories converted with out of the furnace, to prevent the accumulation of heat in the furnace, resulting catalyst overtemperature phenomenon. 

 

(5) Once the temperature of the catalyst over-temperature phenomena, non stop gas, but can not be bored in the conversion furnace gas can be appropriate to add nitrogen to prevent over-temperature catalyst transition. 

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