【Q&A Question 021】2016.05.11
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This post was last edited by liuquan1100 on 2016-5-13 08:58. [Q&A Question No. 021] May 11, 2016: What are the signs that catalyst drying and sulfiding are complete? The answer key will be available after responding; scoring is based on answering the key points. Drying: During the final constant-temperature stage, if no water is released for two consecutive times, whether at high or low settings, it confirms that there is no water remaining in the system. Vulcanization: Vulcanization is carried out at a constant temperature of 320 degrees Celsius for 8 hours. If the amount of DMDS injected remains unchanged, the bed temperature no longer rises, the water level generated as a by-product does not increase, the difference in dew point between the inlet and outlet of the reactor for the recycled hydrogen is no more than 3 degrees Celsius, and the H2S content in the recycled hydrogen stays constant; when the H2S concentration reaches 1%, it stops decreasing and begins to increase, indicating that the vulcanization of the catalyst is complete, and the injection of sulfur should be stopped.
It’s not possible to release cards at the high-score threshold twice in a row.
High scores do not result in water removal, and the water content in the circulating gas remains unchanged
This post was last edited by wangld on 2016-5-11 at 16:47. Vulcanization is carried out at a constant temperature of 320°C for 8 hours. If the feed rate remains unchanged and the bed temperature no longer rises, the liquid level of the high-molecular-weight products does not increase either. The difference in dew point between the inlet and outlet hydrogen in the reactor is no more than 3 degrees Celsius, and the H2S content in the circulating hydrogen stays constant; when the H2S concentration reaches 1%, it stops decreasing and begins to rise, indicating that the vulcanization of the catalyst is complete.
The sign that catalyst drying is complete is (no water can be removed by high-pressure dehydration and the water content in the recycle gas remains unchanged)
This post was last edited by zxsaqwe on 2016-5-11 at 16:56. The dew point of the recycled hydrogen remains relatively constant; the H2S content in the recycled hydrogen is the same. Once the H2S concentration reaches 1%, it stops decreasing and starts to increase gradually
Vulcanization is carried out at a constant temperature of 20 degrees Celsius for 8 hours. If the amount of DMDS injected remains unchanged, the bed temperature no longer rises, the level of water formed as a result of the reaction does not increase, the difference in dew point between the inlet and outlet of the reactor for the recycled hydrogen is no more than 3 degrees Celsius, and the H2S content in the recycled hydrogen stays constant; when the H2S concentration reaches 1%, it stops decreasing and begins to increase, indicating that the vulcanization of the catalyst is complete, and the injection of sulfur should be stopped.
a. The lowest temperature of the bed layer ≮ 250°C. b. For high scores, there is no significant water discharge, or the water discharge volume remains below 0.01 m% for 1 consecutive hour ； (For accelerators).
The high-pressure water volume no longer increases, and the H2S concentration in the circulating hydrogen no longer decreases
Ordinary solid catalysts are in their oxidized state when they leave the production facility. Hydrogen reduction at elevated temperature must be carried out before use. If no drying treatment is carried out, that is, if the rate of temperature increase is not controlled, the moisture contained in the catalyst will evaporate rapidly from it, which will affect the strength of the catalyst after reduction. Additionally, hydrogen undergoes a redox reaction with oxidized catalysts to produce water. No anhydrous formation
Maintain a constant temperature according to the catalyst drying curve. No water is produced at high scores