In the famous Haber process to manufacture ammonia, the reaction is carried out at pressures of 800 to 1000 atm and at 500 to 600C using a suitable catalyst. Only a small fraction of the material entering the reactor reacts on one pass, so recycle is needed. Also, because the nitrogen is obtained from air, it contains almost 1% rare gases (chiefly argon) that do not react. The rare gases would continue to build up in the recycle until their effect on the reaction equilibrium would become adverse, so that a small purge stream is needed. As shown below, the fresh feed of gas composed of 75.16% H2, 24.57% N2 and 0.27% Ar is mixed with the recycled gas and enters the reactor with a composition of 79.52% H2. The gas stream leaving the ammonia separator contains 80.01% ?H2 and no ammonia. The product ammonia contains no dissolved gases. Per 100. Moles of fresh feed: a. How many moles are recycled and purged? b. What is the percent single pass conversion of hydrogen?
In the famous Haber process to manufacture ammonia, the reaction is carried out at pressures of 800 to 1000 atm and at 500 to 600C using a suitable catalyst. Only a small fraction of the material entering the reactor reacts on one pass, so recycle is needed. Also, because the nitrogen is obtained from air, it contains almost 1% rare gases (chiefly argon) that do not react. The rare gases would continue to build up in the recycle until their effect on the reaction equilibrium would become adverse, so that a small purge stream is needed. As shown below, the fresh feed of gas composed of 75.16% H2, 24.57% N2 and 0.27% Ar is mixed with the recycled gas and enters the reactor with a composition of 79.52% H2. The gas stream leaving the ammonia separator contains 80.01% ?H2 and no ammonia. The product ammonia contains no dissolved gases. Per 100. Moles of fresh feed: a. How many moles are recycled and purged? b. What is the percent single pass conversion of hydrogen?
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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In the famous Haber process to manufacture ammonia, the reaction is carried out at pressures of 800 to 1000 atm and at 500 to 600C using a suitable catalyst. Only a small fraction of the material entering the reactor reacts on one pass, so recycle is needed. Also, because the nitrogen is obtained from air, it contains almost 1% rare gases (chiefly argon) that do not react. The rare gases would continue to build up in the recycle until their effect on the reaction equilibrium would become adverse, so that a small purge stream is needed. As shown below, the fresh feed of gas composed of 75.16% H2, 24.57% N2 and 0.27% Ar is mixed with the recycled gas and enters the reactor with a composition of 79.52% H2. The gas stream leaving the ammonia separator contains 80.01% ?H2 and no ammonia. The product ammonia contains no dissolved gases. Per 100. Moles of fresh feed: a. How many moles are recycled and purged? b. What is the percent single pass conversion of hydrogen?
Transcribed Image Text:3H, + N2 → 2NH3
NH, (liquid)
N2
H2
Reactor
Separator
Ar
N2, H2, Ar
Purge (gas)
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