【Q&A Question 312】November 26, 2017
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【Q&A Question 312】November 26, 2017: What is the impact of excessively high temperatures 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, leads to increased carbon deposition on the catalyst, and speeds up its deactivation. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) For management purposes, if you need to view content from a few days ago, please go through the summary post below. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html (Source: Haichuan Chemical Industry Forum)
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. When the temperature is too high, the reaction proceeds too rapidly; the heat generated by the reaction cannot be removed in time, which can lead to catalysis
Carbon deposition occurs more easily; an excessive reaction depth increases the yield of light hydrocarbons
(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) High temperatures cause reactions to proceed too rapidly, and the heat generated by these reactions cannot be removed in time, which leads to coking of the catalyst；
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) High temperatures cause reactions to proceed too rapidly; the heat generated by these reactions cannot be removed in time, which leads to coking of the catalyst；
Excessively high reaction temperatures lead to excessive cracking reactions, increasing catalyst carbon deposition, reducing the liquid yield of the product, and even increasing the olefin content in the product.
(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) High temperatures cause reactions to proceed too rapidly, and the heat generated by these reactions cannot be removed in time, which leads to coking of the catalyst； The inactivation rate increases.
Accelerate side reactions, polymerization, coking, carbonization
It causes the reactants to coking, leading to an excessive reaction rate that shortens the catalyst’s lifespan
(1) Excessively high temperatures can cause excessive cracking reactions, resulting in a decrease in the yield of liquid products and a reduction in hydrogen pressure； 2. Excessively high temperatures lead to rapid reactions; the heat generated by these reactions cannot be dissipated in time, which results in an increase in the temperature of the catalyst bed. This exacerbates the condensation reactions, leading to more carbon buildup on the catalyst and an accelerated rate of deactivation.