【Q&A Question 148】2017.05.28
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This post was last edited by 955559 on 2017-7-21 at 22:50. [Q&A Question 148] May 28, 2017: What is the impact of changes in reaction pressure on production? The reference answers can be seen after responding; points will be awarded for identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) The reaction pressure, or more precisely, the hydrogen partial pressure, has a significant impact on the reaction. Since hydrogenation is a reaction that involves the reduction of molecules, an increase in pressure is beneficial for hydrogenation; it helps to remove sulfur, nitrogen, oxygen, and metal compounds more effectively, and it also saturates olefins and aromatics. This reduces catalyst fouling and extends the catalyst’s lifespan. However, increasing the pressure is limited by the capabilities of the equipment. If the reaction pressure is reduced, the removal of impurities such as sulfur, nitrogen, and oxygen becomes less effective, the saturation of olefins and aromatics decreases, leading to catalyst fouling and a shorter catalyst lifespan. Scoring criteria: 2 points for incorrect answers; 3–8 points for partially correct answers; 10 points for correct answers with detailed explanations; 15–20 points for correct answers with additional supplementary information. Please score according to these criteria. Note: If there are editing records after answering, only points will be awarded to those who participated. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters that have nothing to do with the answer are all considered malicious spamming; points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updating now) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updating now) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (already updated) http://bbs.hcbbs.com/thread-1597792-1-1.html
Increased pressure facilitates the reaction and improves product quality. Conversely, it is unfavorable for reactions such as desulfurization, affecting product quality.
System pressure: A higher pressure is favorable for the hydrogenation reaction, but it is limited by the operating pressure of the equipment. Hydrogen partial pressure: An increase in hydrogen partial pressure can inhibit coking reactions, promote hydrogenation saturation reactions, and reduce the rate of catalyst deactivation; therefore, the hydrogen partial pressure should be increased as much as possible, within the limits permitted by the equipment and operating conditions.
Operating at low pressure is beneficial for the dehydrogenation reaction, improving the liquid yield, hydrogen purity, and productivity, while reducing hydrocracking reactions. At the same time, low pressure increases the formation of coke, and the continuous regeneration method makes it possible to regenerate the catalyst, thereby maintaining its activity.
As the reaction pressure increases and the reaction depth deepens, the product quality improves. However, the reaction pressure must be kept within the designed range and adjusted appropriately according to product quality to avoid waste.
The hydrogen partial pressure has a significant impact on the reaction. Since hydrogenation is a reaction that involves the reduction of molecules, an increase in pressure is beneficial for hydrogenation; it helps to remove sulfur, nitrogen, oxygen, and metal compounds more effectively, and it also saturates olefins and aromatics. This reduces catalyst fouling and extends the catalyst’s lifespan. However, increasing the pressure is limited by the capabilities of the equipment. If the reaction pressure is reduced, the removal of impurities such as sulfur, nitrogen, and oxygen becomes less effective, the saturation rate of olefins and aromatics decreases, which leads to catalyst fouling and shortens the catalyst’s lifespan.
It has an impact on the degree of modification and refinement; for example, it affects elements such as CA, N, S, O, etc., in the product
Reaction pressure, or more precisely, the hydrogen partial pressure, has a significant impact on the reaction. Since hydrogenation is a reaction that involves the reduction of molecules, an increase in pressure is beneficial for hydrogenation; it helps to remove sulfur, nitrogen, oxygen, and metal compounds more effectively, and it also saturates olefins and aromatics. This reduces catalyst fouling and extends the catalyst’s lifespan. However, increasing the pressure is limited by the capabilities of the equipment. If the reaction pressure is reduced, the removal of impurities such as sulfur, nitrogen, and oxygen becomes less effective, the saturation rate of olefins and aromatics decreases, which leads to catalyst fouling and shortens the catalyst’s lifespan.
Reaction pressure, or more precisely, the hydrogen partial pressure, has a significant impact on the reaction. Since hydrogenation is a reaction that involves the reduction of molecules, an increase in pressure is beneficial for hydrogenation; it helps to remove sulfur, nitrogen, oxygen, and metal compounds more effectively, and it also saturates olefins and aromatics. This reduces catalyst fouling and extends the catalyst’s service life. However, increasing the pressure is limited by the capabilities of the equipment. If the reaction pressure is reduced, the effectiveness in removing impurities such as sulfur, nitrogen, and oxygen is diminished, the saturation rate of olefins and aromatics decreases, which leads to catalyst fouling and shortens the catalyst’s lifespan.
Increasing the reaction pressure facilitates the progress of the reaction； But the voltage tolerance of the equipment must be taken into account
The desulfurization efficiency improves, energy consumption increases (in the compressor section), hydrogen consumption rises, and the risk level increases