Problem 3 A 1:3 ratio of nitrogen and hydrogen react catalytically at high temperature and pressure to produce ammonia. The nitrogen source is air and the source of hydrogen is fuel oil, natural gas, etc. The N2-H2 mixture is compressed and sent to the reactor. At the inlet of the compressor, the fresh feed is joined by a recycle stream of unconverted nitrogen and hydrogen. The gases leaving the reactor are cooled and some ammonia liquefies and is removed by a separator. Part of the gas is purged to prevent accumulation of inert gases. The remaining gas is recycled. The overall yield of ammonia is 85%. Only 80% of the ammonia from the reactor is liquefied; the rest goes with the recycled gas. The purge gas contains 11.5% inerts while the fresh H2-N2 feed contains 2.3%. On a basis of 1000 kg of ammonia product, calculate the amount and composition of all streams. Calculate the single-pass conversion in the reactor.
Problem 3 A 1:3 ratio of nitrogen and hydrogen react catalytically at high temperature and pressure to produce ammonia. The nitrogen source is air and the source of hydrogen is fuel oil, natural gas, etc. The N2-H2 mixture is compressed and sent to the reactor. At the inlet of the compressor, the fresh feed is joined by a recycle stream of unconverted nitrogen and hydrogen. The gases leaving the reactor are cooled and some ammonia liquefies and is removed by a separator. Part of the gas is purged to prevent accumulation of inert gases. The remaining gas is recycled. The overall yield of ammonia is 85%. Only 80% of the ammonia from the reactor is liquefied; the rest goes with the recycled gas. The purge gas contains 11.5% inerts while the fresh H2-N2 feed contains 2.3%. On a basis of 1000 kg of ammonia product, calculate the amount and composition of all streams. Calculate the single-pass conversion in the reactor.
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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Transcribed Image Text:Problem 3
A 1:3 ratio of nitrogen and hydrogen react catalytically at high temperature and pressure to
produce ammonia. The nitrogen source is air and the source of hydrogen is fuel oil, natural gas,
etc. The N2-H2 mixture is compressed and sent to the reactor. At the inlet of the compressor, the
fresh feed is joined by a recycle stream of unconverted nitrogen and hydrogen. The gases leaving
the reactor are cooled and some ammonia liquefies and is removed by a separator. Part of the gas
is purged to prevent accumulation of inert gases. The remaining gas is recycled. The overall yield
of ammonia is 85%. Only 80% of the ammonia from the reactor is liquefied; the rest goes with the
recycled gas. The purge gas contains 11.5% inerts while the fresh H2-N2 feed contains 2.3%. On a
basis of 1000 kg of ammonia product, calculate the amount and composition of all streams.
Calculate the single-pass conversion in the reactor.
Problem 4
Phthalic anhydride (PA) is produced by the oxidation of o-xylene (CSH10) in a fixed bed reactor
at 350°C according to the following reaction:
C3H10 + O2 → C3H.O3 + H2O
A condenser is used to remove all the PA (C3H,O3) as a mixture of solid and liquid. How many
kilograms of o-xylene are recycled per hour if the purge gas is 78% N2 (the balance is a mixture
of xylene, air, and H20) and 60% conversion of o-xylene takes place on one-pass through the
reactor?
Recycle
Purge
78% N.
Air
kmol/hr
118 kmolihr
REACTOR
O-xylene 6 kmolhr
Solid and Liquid PA
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