【Daily Question 2019】Hydrogen production and hydrogenation section – Questions 5-13
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This post was last edited by Internet Invisible Man on 2019-5-13 at 11:16. [Daily Question 2019] Hydrogen production and hydrogenation section – Question No. 5-13: What is the main role of recycled hydrogen and its flow rate in hydrogenation reactions? (1) Maintain a high hydrogen partial pressure in the reaction system; since most of the supplementary hydrogen is consumed by chemical reactions, the hydrogen partial pressure would be very low in the absence of recycled hydrogen. 2) Circulating hydrogen, as a heat transfer medium, can limit the temperature rise in the catalyst bed. The hydroprocessing of paraffinic oils generates a large amount of heat; it is necessary to introduce sufficient quench hydrogen between the catalyst beds in order to remove this heat promptly and control the temperature rise in the catalyst beds. 3) Promote uniform distribution of the liquid feed throughout the entire catalyst bed, thereby suppressing the formation of hot spots and improving reaction performance.
Answer: (1) Maintain a high hydrogen partial pressure in the reaction system; since most of the supplementary hydrogen is consumed by chemical reactions, the hydrogen partial pressure would be very low in the absence of recycled hydrogen. (2) Circulating hydrogen, as a heat transfer medium, can limit the temperature rise in the catalyst bed. The hydroprocessing of paraffinic oils generates a large amount of heat; it is necessary to introduce sufficient quench hydrogen between the catalyst beds in order to remove this heat promptly and control the temperature rise in the catalyst beds. (3) Promote uniform distribution of the liquid feed throughout the entire catalyst bed, thereby suppressing the formation of hot spots and improving reaction performance.
(1) Maintain a high hydrogen partial pressure in the reaction system; since most of the supplementary hydrogen is consumed by chemical reactions, the hydrogen partial pressure would be very low in the absence of recycled hydrogen. (2) Circulating hydrogen, as a heat transfer medium, can limit the temperature rise in the catalyst bed. The hydroprocessing of paraffinic oils generates a large amount of heat; it is necessary to introduce sufficient quench hydrogen between the catalyst beds in order to remove this heat promptly and control the temperature rise in the catalyst beds. (3) Promote uniform distribution of the liquid feed throughout the entire catalyst bed, thereby suppressing the formation of hot spots and improving reaction performance.
1. Increase the hydrogen partial pressure in the bed layer. 2. Serve as a heat transfer medium. 3. Promote uniform distribution of the liquid phase in the catalyst bed.
1) Maintain a high hydrogen partial pressure in the reaction system; since most of the supplemental hydrogen is consumed by chemical reactions, the hydrogen partial pressure would be very low in the absence of recycled hydrogen. 2) Circulating hydrogen, as a heat transfer medium, can limit the temperature rise in the catalyst bed. The hydroprocessing of paraffinic oils generates a large amount of heat; it is necessary to introduce sufficient quench hydrogen between the catalyst beds in order to remove this heat promptly and control the temperature rise in the catalyst beds. 3) Promote uniform distribution of the liquid feed throughout the entire catalyst bed, thereby suppressing the formation of hot spots and improving reaction performance.
What is the main role of recycled hydrogen and its flow rate in hydrogenation reactions? Answer: 1. Maintain the hydrogen partial pressure of the system. 2. Heat transfer medium 3. To ensure uniform distribution of the liquid feed and prevent the formation of hot spots,
○1 Keep the reaction system at a high hydrogen partial pressure; since most of the additional hydrogen is consumed in chemical reactions, the hydrogen partial pressure would be very low in the absence of recycled hydrogen. ○2. Circulating hydrogen, as a heat transfer medium, can limit the temperature rise in the catalyst bed. The hydrorefining reaction releases a large amount of heat; therefore, sufficient quench hydrogen must be introduced between the catalyst beds to remove this heat promptly and control the temperature rise in the catalyst beds. ○3 It promotes uniform distribution of the liquid feed throughout the entire catalyst bed, thereby suppressing the formation of hot spots and improving reaction performance.
Maintain hydrogen partial pressure, remove reaction heat, and protect the catalyst
1. Maintain a high hydrogen partial pressure in the reaction system; since most of the additional hydrogen is consumed by the reaction, the hydrogen partial pressure is very low in the absence of recycled hydrogen. 2. Circulating hydrogen, acting as a heat transfer medium, can limit the temperature rise in the catalyst bed. The hydrorefining reaction releases a large amount of heat; therefore, sufficient quench hydrogen must be introduced between the catalyst beds to remove this heat and control the temperature rise in those catalyst beds. 3. Ensure a uniform distribution of the liquid feed throughout the entire catalyst bed, in order to prevent the formation of hot spots and thereby improve reaction performance.
Maintaining a high hydrogen partial pressure, cooling the catalyst bed, and improving the uniform distribution of the material within the reactor.
1. Increase the hydrogen partial pressure in the bed layer. 2. Serve as a heat transfer medium. 3. Promote uniform distribution of the liquid phase in the catalyst bed.