A process for methanol synthesis is presented in the block diagram (figure 1). The pertinent chemical...
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A process for methanol synthesis is presented in the block diagram (figure 1). The pertinent chemical reactions involved are: CH₂ + 2H₂O → CO₂ + 4H₂ CH₂ + H₂O →CO + 3H₂ 2C0+0₂ - 200₂ CO₂ + 3H₂CH₂OH+H₂O (methanol synthesis reaction) (d) Ten percent excess steam, based on reaction (a), is fed to the reformer, and conversion of methane is 100%, with a 90% yield of CO₂. Conversion in the methanol reactor is 55% on one pass through the reactor. CO₂ Makeup 6 Oxygen 4 Methane Feed Steam 2 1 3 Reformen CO converter (main reformer reaction) (reformer side reaction) (CO reaction) 9 Recycle 81 10 Methanol reactor (a) (b) (c) Purge 13 Condenser Methanol Solution 11 Figure 1: Bock flow diagram of the methanol synthesis production unit A stocheiometric quantity of oxygen is fed to the CO converter, and the CO is completely converted to CO₂. Additional makeup CO₂ is then introduced to esatblish a 3-to-1 ratio 1₂ to CO₂ in the feed stream to the methanol reactor. 2| Page The methanol reactor effluent is cooled to condense all the methanol and water, with the noncondensible gases recycled to the methanol reactor feed. The H/CO₂ ratio in the recylee stream is also 3-to-1. Because the methane feed contains 1% nitrogen as an impurity, a portion of the receycle stream must be purged as shown in the figure I to prevent the accumulation of nitrogen in the system. The purge stream analyzes 5% nitrogen. 1) Sketch the PFD f the process and label all the streams, blocks etc... according to the guidelines presented in "Lecture_02_bonus_GCH350", 2) On the basis of 100 mol/h of methane feed (inculding the N₂), calculate: a. How many moles of H₂ are lost in the purge. b. How many moles of makeup CO₂ are required. c. The recycle to purge ratio in mol/mol. d. How much methanol solution (in kg/h) of what strength (weight percent) is produced. 3 | Page A process for methanol synthesis is presented in the block diagram (figure 1). The pertinent chemical reactions involved are: CH₂ + 2H₂O → CO₂ + 4H₂ CH₂ + H₂O →CO + 3H₂ 2C0+0₂ - 200₂ CO₂ + 3H₂CH₂OH+H₂O (methanol synthesis reaction) (d) Ten percent excess steam, based on reaction (a), is fed to the reformer, and conversion of methane is 100%, with a 90% yield of CO₂. Conversion in the methanol reactor is 55% on one pass through the reactor. CO₂ Makeup 6 Oxygen 4 Methane Feed Steam 2 1 3 Reformen CO converter (main reformer reaction) (reformer side reaction) (CO reaction) 9 Recycle 81 10 Methanol reactor (a) (b) (c) Purge 13 Condenser Methanol Solution 11 Figure 1: Bock flow diagram of the methanol synthesis production unit A stocheiometric quantity of oxygen is fed to the CO converter, and the CO is completely converted to CO₂. Additional makeup CO₂ is then introduced to esatblish a 3-to-1 ratio 1₂ to CO₂ in the feed stream to the methanol reactor. 2| Page The methanol reactor effluent is cooled to condense all the methanol and water, with the noncondensible gases recycled to the methanol reactor feed. The H/CO₂ ratio in the recylee stream is also 3-to-1. Because the methane feed contains 1% nitrogen as an impurity, a portion of the receycle stream must be purged as shown in the figure I to prevent the accumulation of nitrogen in the system. The purge stream analyzes 5% nitrogen. 1) Sketch the PFD f the process and label all the streams, blocks etc... according to the guidelines presented in "Lecture_02_bonus_GCH350", 2) On the basis of 100 mol/h of methane feed (inculding the N₂), calculate: a. How many moles of H₂ are lost in the purge. b. How many moles of makeup CO₂ are required. c. The recycle to purge ratio in mol/mol. d. How much methanol solution (in kg/h) of what strength (weight percent) is produced. 3 | Page
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100mol feed into the reformer 99 mol Methane N2 1 mol Reactions 2H2O CO2 4H2 CH4 main CH4 CO2 3H2 si... View the full answer
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Thermodynamics An Engineering Approach
ISBN: 978-0073398174
8th edition
Authors: Yunus A. Cengel, Michael A. Boles
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