【Q&A Question 066】2017.03.07
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This post was last edited by 955559 on 2017-7-21 22:23. [Q&A Question No. 066] 2017.03.07: Why should the heating rate be strictly controlled at 10–15°C before raising the temperature of the new catalyst to 150°C? The reference answers will be visible after responding; scoring is awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) During the catalyst loading process, it is exposed to the atmosphere and can become damp easily; the temperature of the newly installed catalyst
When the temperature of the new catalyst is below 150°C, it is in the stage of dehydration from the catalyst’s micropores. If the temperature rises too rapidly during this stage, a large amount of water vaporizes, which can damage the catalyst’s micropores; in severe cases, this can lead to damage to the catalyst itself, resulting in an excessive pressure drop across the bed and shortening the time required for the catalyst to become operational. During the temperature rise phase from 150–250°C, the rate of temperature increase can be increased appropriately. Most of the water in the catalyst overflows out at a constant temperature of 150°C, but it is also necessary to ensure that the heating rate does not exceed 20°C/h
When the temperature of the new catalyst is below 150°C, it is in the stage of dehydration from the catalyst’s micropores. If the temperature rises too rapidly during this stage, a large amount of water vaporizes, which can damage the catalyst’s micropores; in severe cases, this can lead to damage to the catalyst itself, resulting in an excessive pressure drop across the bed and shortening the time required for the catalyst to become operational. During the temperature rise phase from 150–250°C, the rate of temperature increase can be increased appropriately. Most of the water in the catalyst overflows out at a constant temperature of 150°C, but it is also necessary to ensure that the heating rate does not exceed 20°C/h
As the catalyst bed starts to heat up from room temperature, it goes through two stages: from room temperature to 150°C, and from 150°C to 250°C. At a temperature of 150°C with a newly installed catalyst, it is in the stage of dehydration from within the catalyst’s micropores. If the temperature rises too rapidly during this stage, a large amount of water vaporizes, which can damage the catalyst’s micropores; in severe cases, this may even cause the catalyst to break apart, resulting in an excessive pressure drop across the bed and shortening the time required for it to become operational.
When the catalyst bed is heated from room temperature, it occurs in two stages: from room temperature to 150°C, and from 150°C to 250°C. When the temperature of the new catalyst is below 150°C, it is in the stage of dehydration from the catalyst’s micropores. If the temperature rises too rapidly during this stage, a large amount of water vaporizes, which can damage the catalyst’s micropores; in severe cases, this can lead to damage to the catalyst itself, resulting in an excessive pressure drop across the bed and shortening the time required for the catalyst to become operational. During the temperature rise phase from 150–250°C, the rate of temperature increase can be increased appropriately. Most of the water in the catalyst overflows out at a constant temperature of 150°C, but it is also necessary to ensure that the heating rate does not exceed 20°C/h.
During the catalyst loading process, it is exposed to the atmosphere and is prone to becoming damp; the temperature of the newly installed catalyst
During the catalyst loading process, it is exposed to the atmosphere and can easily become damp; the temperature of the newly installed catalyst
As the catalyst bed starts to heat up from room temperature, it goes through two stages: from room temperature to 150°C, and from 150°C to 250°C. New catalyst temperature