【Q&A Question 062】2016.06.21
Thread Content
【Q&A Question 062】June 21, 2016: What should be the temperature control for introducing hydrogen into the system before catalyst presulfidization? Why? The reference answer can be seen after responding; scoring is based on addressing the key points. Before catalyst presulfiding, when hydrogen is introduced into the unit, the temperature at the highest point of the bed layer should be below 190℃ ； To prevent the hydrogen reduction of the catalyst. .
Not exceeding 180: At excessively high temperatures without sulfur, the catalyst will be reduced
No point in the bed layer shall exceed 230°C; when DMDS is used as the vulcanizing agent, sulfur injection begins at 190°C, while with carbon disulfide, sulfur injection can start at 175–180°C
Hydrogen is introduced at room temperature. Purpose: To prevent hydrogen embrittlement.
Below 150 degrees Celsius to prevent the catalyst from being reduced.
The maximum temperature for temperature control should be below 190℃； To prevent the hydrogen reduction of the catalyst.
When introducing hydrogen into the unit, the temperature at the highest point of the bed layer should be below 150°C. Before hydrogen sulfide passes through the catalyst bed, the temperature at the highest point of the bed does not exceed 230°C. Avoid the reduction of the catalyst’s metal components by hydrogen
Keep it at 150 degrees to prevent the catalyst from being reduced
Before catalyst presulfiding, when hydrogen is introduced into the unit, the temperature at the highest point of the bed layer should be below 190℃； to prevent the hydrogen reduction of the catalyst