[Q&A Question 126] 2018.05.06
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【Q&A Question 126】May 06, 2018: Briefly describe the main precautions to be taken when drying hydrogenation catalysts ①In order to allow the moisture in the catalyst to be released at a lower temperature, the pressure in the reaction system during the catalyst drying stage should be maintained at 1.5 MPa ； ②Within the capacity range of the compressor, the gas-to-agent ratio should be as high as possible, so that the temperature in the reaction bed rises rapidly, the temperature distribution is uniform, and water on the catalyst is removed quickly ； ③ During the heating and constant-temperature phases, a dedicated person is responsible for weighing and recording the amount of water lost ； ④ The heating rate should not be too fast, and the holding time at 250°C should be no less than 6 hours ； ⑤Hydrogen cannot be introduced when the bed temperature is higher than the maximum hydrogen inlet temperature specified by the catalyst supplier ； ⑥ When the high-pressure separator cannot release water and the water content in the recycle gas remains unchanged, it can be considered that catalyst drying is complete; otherwise, the constant-temperature holding time for the catalyst can be appropriately extended. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The validity period for this question is 48 hours; within those 48 hours, 10 wealth points are awarded for correct answers and 2 wealth points for incorrect answers ； If the response is given after 48 hours, the score is halved, regardless of whether it is correct or not ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space through the summary post below. The APP short-video skill competition has begun! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1951670
Precautions for drying hydrogenation catalysts include: ① To enable the moisture in the catalyst to be released at a lower temperature, the pressure in the reaction system during the catalyst drying stage should be maintained at 1.5 MPa； ②Within the limits achievable by the compressor, the gas-solid ratio should be as high as possible, so that the temperature wave in the reaction bed advances rapidly, the temperature distribution is uniform, and water is removed from the catalyst more quickly. ③During the heating and constant-temperature phases, a dedicated person is responsible for weighing and recording the amount of water lost ； ④The heating rate should not be too fast, and the holding time at 250°C should be no less than 6 hours ； ⑤Hydrogen cannot be introduced when the bed temperature is higher than the maximum hydrogen inlet temperature specified by the catalyst supplier. ⑥When the high-pressure separator can no longer release water and the water content in the recycle gas remains unchanged, it can be considered that catalyst drying is complete; otherwise, the catalyst can be held at a constant temperature for an appropriate longer period.
①In order to allow the moisture in the catalyst to be released at a lower temperature, the pressure in the reaction system during the catalyst drying stage should be maintained at 1.5 MPa； ②Within the capacity range of the compressor, the gas-to-agent ratio should be as high as possible, so that the temperature in the reaction bed rises rapidly, the temperature distribution is uniform, and water on the catalyst is removed quickly ； ③ During the heating and constant-temperature phases, a dedicated person is responsible for weighing and recording the amount of water lost ； ④ The heating rate should not be too fast, and the holding time at 250°C should be no less than 6 hours ； ⑤Hydrogen cannot be introduced when the bed temperature is higher than the maximum hydrogen inlet temperature specified by the catalyst supplier ； ⑥ When the high-pressure separator cannot release water and the water content in the recycle gas remains unchanged, it can be considered that catalyst drying is complete; otherwise, the constant-temperature holding time for the catalyst can be appropriately extended.
Precautions for drying hydrogenation catalysts include: ① To enable the moisture in the catalyst to be released at a lower temperature, the pressure in the reaction system during the catalyst drying stage should be maintained at 1.5 MPa； ②Within the limits achievable by the compressor, the gas-solid ratio should be as high as possible, so that the temperature wave in the reaction bed advances rapidly, the temperature distribution is uniform, and water is removed from the catalyst more quickly. ③During the heating and constant-temperature phases, a dedicated person is responsible for weighing and recording the amount of water lost ； ④The heating rate should not be too fast, and the holding time at 250°C should be no less than 6 hours ； ⑤Hydrogen cannot be introduced when the bed temperature is higher than the maximum hydrogen inlet temperature specified by the catalyst supplier. ⑥When the high-pressure separator can no longer release water and the water content in the recycle gas remains unchanged, it can be considered that catalyst drying is complete; otherwise, the catalyst can be held at a constant temperature for an appropriate longer period.
Precautions for drying hydrogenation catalysts include: ? ① To enable the moisture in the catalyst to be released at a lower temperature, the pressure in the reaction system during the catalyst drying stage should be maintained at 1.5 MPa； ? ② Within the limits achievable by the compressor, the gas-agent ratio should be as high as possible; this enables faster propagation of the temperature wave through the reaction bed, a more uniform temperature distribution, and quicker removal of water from the catalyst. ? ③ During the heating and constant-temperature phases, a dedicated person is responsible for weighing and recording the amount of water lost ； ? ④ The heating rate should not be too fast; the time at a constant temperature of 250°C should be no less than 6 hours ； ? ⑤ Hydrogen cannot be introduced when the bed temperature is higher than the maximum hydrogen inlet temperature specified by the catalyst supplier. ? ⑥ When the high-pressure separator cannot release water and the water content in the recycle gas remains unchanged, it can be assumed that the catalyst drying is complete; otherwise, the constant-temperature holding time for the catalyst can be appropriately extended
①To enable the moisture in the catalyst to be released at a lower temperature, the pressure in the reaction system during the catalyst drying stage should be maintained at 1.5 MPa； ②Within the limits achievable by the compressor, the gas-solid ratio should be as high as possible, so that the temperature wave in the reaction bed advances rapidly, the temperature distribution is uniform, and water is removed from the catalyst more quickly. ③During the heating and constant-temperature phases, a dedicated person is responsible for weighing and recording the amount of water lost ； ④The heating rate should not be too fast, and the holding time at 250°C should be no less than 6 hours ； ⑤Hydrogen cannot be introduced when the bed temperature is higher than the maximum hydrogen inlet temperature specified by the catalyst supplier. ⑥When the high-pressure separator can no longer release water and the water content in the recycle gas remains unchanged, it can be considered that catalyst drying is complete; otherwise, the catalyst can be held at a constant temperature for an appropriate longer period.
①To enable the moisture in the catalyst to be released at a lower temperature, the pressure in the reaction system during the catalyst drying stage should be maintained at 1.5 MPa； ②Within the limits achievable by the compressor, the gas-solid ratio should be as high as possible, so that the temperature wave in the reaction bed advances rapidly, the temperature distribution is uniform, and water is removed from the catalyst more quickly. ③During the heating and constant-temperature phases, a dedicated person is responsible for weighing and recording the amount of water lost ； ④The heating rate should not be too fast, and the holding time at 250°C should be no less than 6 hours ； ⑤Hydrogen cannot be introduced when the bed temperature is higher than the maximum hydrogen inlet temperature specified by the catalyst supplier. ⑥When the high-pressure separator can no longer release water and the water content in the recycle gas remains unchanged, it can be considered that catalyst drying is complete; otherwise, the catalyst can be held at a constant temperature for an appropriate longer period.
①To enable the moisture in the catalyst to be released at a lower temperature, the pressure in the reaction system during the catalyst drying stage should be maintained at 1.5 MPa； ②Within the limits achievable by the compressor, the gas-solid ratio should be as high as possible, so that the temperature wave in the reaction bed advances rapidly, the temperature distribution is uniform, and water is removed from the catalyst more quickly. ③During the heating and constant-temperature phases, a dedicated person is responsible for weighing and recording the amount of water lost ； ④The heating rate should not be too fast, and the holding time at 250°C should be no less than 6 hours ； ⑤Hydrogen cannot be introduced when the bed temperature is higher than the maximum hydrogen inlet temperature specified by the catalyst supplier. ⑥When the high-pressure separator can no longer release water and the water content in the recycle gas remains unchanged, it can be considered that catalyst drying is complete; otherwise, the catalyst can be held at a constant temperature for an appropriate longer period.
①In order to allow the moisture in the catalyst to be released at a lower temperature, the pressure in the reaction system during the catalyst drying stage should be maintained at 1.5 MPa； ②Within the capacity range of the compressor, the gas-to-agent ratio should be as high as possible, so that the temperature in the reaction bed rises rapidly, the temperature distribution is uniform, and water on the catalyst is removed quickly ； ③ During the heating and constant-temperature phases, a dedicated person is responsible for weighing and recording the amount of water lost ； ④ The heating rate should not be too fast, and the holding time at 250°C should be no less than 6 hours ； ⑤Hydrogen cannot be introduced when the bed temperature is higher than the maximum hydrogen inlet temperature specified by the catalyst supplier ； ⑥ When the high-pressure separator cannot release water and the water content in the recycle gas remains unchanged, it can be considered that catalyst drying is complete; otherwise, the constant-temperature holding time for the catalyst can be appropriately extended.
1. During the catalyst drying stage, the reaction pressure must be maintained at 1.5 MPa； 2. The heating rate should not be too fast; the holding temperature at 250°C should be maintained for no less than 6 hours ； 3. When the bed temperature is higher than the maximum hydrogen inlet temperature for the catalyst, hydrogen cannot be introduced ； 4. When the high-pressure separator can no longer release water and the water content in the recycle gas remains unchanged, catalyst drying is complete.
①In order to allow the moisture in the catalyst to be released at a lower temperature, the pressure in the reaction system during the catalyst drying stage should be maintained at 1.5 MPa