[Q&A Question 219] 2018.08.13
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【Q&A Question 219】August 13, 2018: Briefly describe the hazards of too low a feed rate in a hydrogenation unit ①At the same temperature, a low space velocity and long residence time result in intense hydrogenation reactions, which can make it difficult to control the bed temperature ； ②Too low an air velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface ； ③Too low an air velocity results in a higher content of light components in the products, especially an increase in the amount of gas ； ④Too low an air velocity can cause channeling in the reaction bed ； ⑤When the feed rate is too low, it becomes more difficult to operate the distillation system. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Correct: 3 wealth, Incorrect: 1 wealth ； 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 disadvantages of too low a feed rate are: (1) At the same temperature, the space velocity is low and the residence time is long, resulting in intense hydrogenation reactions that make it difficult to control the bed temperature； (2) An excessively low space velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface ； (3) An excessively low air velocity results in a higher content of light components in the products, especially an increase in the amount of gas ； (4) Too low an air velocity can cause channeling in the reaction bed ； (5) When the feed rate is too low, it becomes more difficult to operate the diversion system.
Answer: ① At the same temperature, a low space velocity and a long residence time result in intense hydrogenation reactions, which can make it difficult to control the bed temperature； ②Too low an air velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface ； ③Too low an air velocity results in a higher content of light components in the products, especially an increase in the amount of gas ； ④Too low an air velocity can cause channeling in the reaction bed ； ⑤When the feed rate is too low, it becomes more difficult to operate the distillation system.
①At the same temperature, a low space velocity and long residence time result in intense hydrogenation reactions, which can make it difficult to control the bed temperature； ②Too low an air velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface ； ③Too low a space velocity results in an increased proportion of light components in the products, especially an increase in the amount of gas; ④ A too low space velocity causes channeling in the reaction bed ； ⑤When the feed rate is too low, it becomes more difficult to operate the distillation system.
①At the same temperature, a low space velocity and long residence time result in intense hydrogenation reactions, which can make it difficult to control the bed temperature； ②Too low an air velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface ； ③Too low an air velocity results in a higher content of light components in the products, especially an increase in the amount of gas ； ④Too low an air velocity can cause channeling in the reaction bed ； ⑤When the feed rate is too low, it becomes more difficult to operate the distillation system.
The disadvantages of too low feed rate to the unit are: (1) At the same temperature, the space velocity is low and the residence time is long, resulting in intense hydrogenation reactions that can make it difficult to control the bed temperature. (2) Too low an air velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface. (3) An excessively low air velocity results in a higher content of light components in the products, especially an increase in the amount of gas. (4) Too low an air velocity can cause channeling in the reaction bed. (5) When the feed rate is too low, it becomes more difficult to operate the distillation system.
The disadvantages of too low a feed rate are: (1) At the same temperature, the space velocity is low and the residence time is long, resulting in intense hydrogenation reactions that make it difficult to control the bed temperature； (2) An excessively low space velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface ； (3) An excessively low air velocity results in a higher content of light components in the products, especially an increase in the amount of gas ； (4) Too low an air velocity can cause channeling in the reaction bed ； (5) When the feed rate is too low, it becomes more difficult to operate the diversion system.
①At the same temperature, a low space velocity and long residence time result in intense hydrogenation reactions, which can make it difficult to control the bed temperature； ②Too low an air velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface ； ③Too low an air velocity results in a higher content of light components in the products, especially an increase in the amount of gas ； ④Too low an air velocity can cause channeling in the reaction bed ； ⑤When the feed rate is too low, it becomes more difficult to operate the distillation system.
The disadvantages of too low a feed rate are: (1) At the same temperature, the space velocity is low and the residence time is long, resulting in intense hydrogenation reactions that make it difficult to control the bed temperature； (2) An excessively low space velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface ； (3) An excessively low air velocity results in a higher content of light components in the products, especially an increase in the amount of gas ； (4) Too low an air velocity can cause channeling in the reaction bed ； (5) When the feed rate is too low, it becomes more difficult to operate the diversion system.
The disadvantages of too low a feed rate are: (1) At the same temperature, the space velocity is low and the residence time is long, resulting in intense hydrogenation reactions that make it difficult to control the bed temperature； (2) An excessively low space velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface ； (3) An excessively low air velocity results in a higher content of light components in the products, especially an increase in the amount of gas ； (4) Too low an air velocity can cause channeling in the reaction bed ； (5) When the feed rate is too low, it becomes more difficult to operate the diversion system.
1. At the same temperature, a low space velocity and long residence time result in intense hydrogenation reactions, which can make it difficult to control the bed temperature； 2. An excessively low space velocity increases the likelihood of condensation reactions, leading to coking on the catalyst surface ； 3. An excessively low air velocity results in a higher content of light components in the products, especially an increase in the amount of gas ； 4. Too low an air velocity can cause channeling in the reaction bed ； 5. When the feed rate is too low, the operation of the distillation system becomes more difficult.