【Q&A Question 057】February 26, 2018
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【Q&A Question 057】February 26, 2018: What is the impact of excessive temperature on hydrogenation reactions? 1. Excessively high temperatures can lead to excessive cracking reactions, resulting in a decrease in the yield of liquid products and a reduction in hydrogen partial pressure ； 2. Excessively high temperatures lead to rapid reactions; the heat generated by these reactions cannot be dissipated in time, which results in an excessive temperature in the catalyst bed. This accelerates the condensation reactions, leading to increased carbon deposition on the catalyst and a faster rate of deactivation. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Due to the limitations on the number of posts in the “One Question per Day” section, “One Image per Day” has been moved to the registered devices section; you can access it through the directory I posted. For management purposes, if you need to access content from a few days ago, please go to the summary post below to enter the “My Registration Season” event – (Note: This event is currently ongoing in the Chemical Engineering section). https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=18978 For the daily questions section related to chemical engineering technology training in 2018: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888971 For the daily image summary section related to registration equipment in 2018: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888970 For the Q&A section related to hydrogen production and hydrogenation technologies in 2018: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888968 For the daily questions section related to LNG technology in 2018: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888973 For the Q&A section from 2017 (updates have started): https://bbs.hcbbs.com/thread-1657793-1-1.html For the daily questions section from 2017 (updates have started): https://bbs.hcbbs.com/thread-1657794-1-1.html For the daily image summary section from 2017: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1875160 For the list of daily questions related to LNG technology in 2017: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1804162 For the Q&A section from 2016 (updates are complete): https://bbs.hcbbs.com/thread-1597792-1-1.html
Carbon buildup occurs quickly, the catalyst has a short lifespan, there are many pyrolysis products, and there is significant loss in octane rating
Excessively high temperatures cause excessive cracking reactions, resulting in a decrease in the yield of liquid products and a reduction in hydrogen partial pressure.
1. Excessively high temperatures can lead to excessive cracking reactions, resulting in a decrease in the yield of liquid products and a reduction in hydrogen partial pressure； 2. Excessively high temperatures lead to rapid reactions; the heat generated by these reactions cannot be dissipated in time, which results in an excessive temperature in the catalyst bed. This accelerates the condensation reactions, leading to increased carbon deposition on the catalyst and a faster rate of deactivation.
Answer: (1) Excessively high temperatures can lead to excessive cracking reactions, resulting in a decrease in the yield of liquid products and a reduction in hydrogen partial pressure； (2) Excessively high temperatures lead to rapid reactions; the heat generated by these reactions cannot be dissipated in time, which results in an excessive temperature in the catalyst bed. This accelerates the condensation reactions, leads to increased carbon deposition on the catalyst, and speeds up its deactivation.
1. Excessively high temperatures can lead to excessive cracking reactions, resulting in a decrease in the yield of liquid products and a reduction in hydrogen partial pressure； 2. Excessively high temperatures lead to rapid reactions; the heat generated by these reactions cannot be dissipated in time, which results in an excessive temperature in the catalyst bed. This accelerates the condensation reactions, leads to increased carbon deposition on the catalyst, and speeds up its deactivation.
(1) Excessively high temperatures lead to excessive cracking reactions, resulting in a decrease in the yield of liquid products and a reduction in hydrogen pressure; 2 High temperatures cause reactions to proceed too rapidly, and the heat generated by these reactions cannot be removed in time, leading to catalyst carbon deposition
1. Excessively high temperatures can lead to excessive cracking reactions, resulting in a decrease in the yield of liquid products and a reduction in hydrogen partial pressure； 2. Excessively high temperatures lead to rapid reactions; the heat generated by these reactions cannot be dissipated in time, which results in an excessive temperature in the catalyst bed. This accelerates the condensation reactions, leading to increased carbon deposition on the catalyst and a faster rate of deactivation.
A. The hydrogenation reaction occurs too rapidly, and the heat generated by the reaction cannot be removed in time. B. It can cause the temperature of the catalyst bed to rise too high, and may even lead to overheating. C. Increased catalyst carbon deposition accelerates deactivation.
Answer: 1. Excessively high temperatures lead to excessive cracking reactions, resulting in a decrease in the yield of liquid products and a reduction in hydrogen partial pressure； 2. Excessively high temperatures lead to rapid reactions; the heat generated by these reactions cannot be dissipated in time, which results in an excessive temperature in the catalyst bed. This accelerates the condensation reactions, leading to increased carbon deposition on the catalyst and a faster rate of deactivation.