In the nitric acid manufacture, 100 m'/h of ammonia at 290 K and 1 bar is mixed with air and passed over a catalyst in a converter and the following reaction takes place: 4 NH, +50, - 6H¸0 + 4 NO. The gases from the converter are passed into an oxidizing tower where the oxidation completed according to the following reactions: 2NO + 02 -2 NO, The gases from the oxidizing tower are passed into a cooling tower where NO, is absorbed in 50 kg/h of water and forms nitric acid according to the reaction 3 NO, + H,0 - 2 HNO, + NO. The overall reaction for the process is given by NH3 +202 - HNO, + H20. Air supplied is 20% in excess of the required air for complete axidation of the ammonia to nitric acid and water. The degree of completion of the reaction in the converter is 85%. 90% of the nitric oxide entering the oxidizing tower is converted to nitrogen peroxide. Assume that the cooling tower exit gases contain no water vapor. Calculate the following: a) The amount of air to be used in m'/h at 1 bar and 290 K b) The amounts of gases leaving the converter in m/h at 0.95 bar and 1000 K c) The amount in kg/h and concentration in weight % of nitric acid produced
In the nitric acid manufacture, 100 m'/h of ammonia at 290 K and 1 bar is mixed with air and passed over a catalyst in a converter and the following reaction takes place: 4 NH, +50, - 6H¸0 + 4 NO. The gases from the converter are passed into an oxidizing tower where the oxidation completed according to the following reactions: 2NO + 02 -2 NO, The gases from the oxidizing tower are passed into a cooling tower where NO, is absorbed in 50 kg/h of water and forms nitric acid according to the reaction 3 NO, + H,0 - 2 HNO, + NO. The overall reaction for the process is given by NH3 +202 - HNO, + H20. Air supplied is 20% in excess of the required air for complete axidation of the ammonia to nitric acid and water. The degree of completion of the reaction in the converter is 85%. 90% of the nitric oxide entering the oxidizing tower is converted to nitrogen peroxide. Assume that the cooling tower exit gases contain no water vapor. Calculate the following: a) The amount of air to be used in m'/h at 1 bar and 290 K b) The amounts of gases leaving the converter in m/h at 0.95 bar and 1000 K c) The amount in kg/h and concentration in weight % of nitric acid produced
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:In the nitric acid manufacture, 100 m/h of ammonia at 290 K and 1 bar is mixed with
air and passed over a catalyst in a converter and the following reaction takes place:
4 NH3 +502 - 6 H20 + 4 NO.
The gases from the converter are passed into an oxidizing tower where the oxidation completed
according to the following reactions:
2NO + 02 → 2 NO2.
The gases from the oxidizing tower are passed into a cooling tower where NO; is absorbed in
3 NO, + H,0 - 2 HNO, + NO.
50 kg/h of water and forms nitric acid according to the reaction
The overall reaction for the process is given by
NH3 + 2 02 - HNO3 + H20.
Air supplied is 20% in excess of the required air for complete oxidation of the ammonia to nitric
acid and water. The degree of completion of the reaction in the converter is 85%. 90% of the
nitric oxide entering the oxidizing tower is converted to nitrogen peroxide. Assume that the
cooling tower exit gases contain no water vapor. Calculate the following:
a) The amount of air to be used in m'/h at 1 bar and 290 K
b) The amounts of gases leaving the converter in m/h at 0.95 bar and 1000 K
c) The amount in kg/h and concentration in weight % of nitric acid produced
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