n the manufacture of sulfuric acid by the contact process iron pyrites, FeSj, is burned in dry air, the iron being oxidized to Fe203. The sulfur dioxide thus formed is further oxidized to the trioxide by conducting the gases mixed with air over a catalytic mass of platinum-black at a suitable temperature. It will be assumed that in the operation sufficient air is supplied to the pyrites burner that the oxygen shall be 40% in excess of that required if all the sulfur actually burned were oxidized to the trioxide. Of the pyrites charged, 15% is lost by falling through the grate with the " cinder " and is not burned. (a) Calculate the weight of air to be used per 100 lb of pyrites charged. (6) In the burner and a " contact shaft " connected with it, 40% of the sulfur burned is oonvertfed to the trioxide. Cal«ilatethecompo&itioa,byweight, of the gases leaving the contact shaft. (c) By means of the platinum catalytic mass, 96% of the sulfur dioxide remain- ing in the gases leaving the contact shaft is converted to the trioxide. Calculate the total weight of SO3 formed per 100 lb of pyrites charged. (d) Assuming that all gases from the contact shaft are passed through the catalyzer, calculate the composition by weight of the resulting gaseous products. (e) Calculate the overall degree of completion of the conversion of the sulfur in the pyrites charged to SO3 in the final products.
n the manufacture of sulfuric acid by the contact process iron pyrites, FeSj, is burned in dry air, the iron being oxidized to Fe203. The sulfur dioxide thus formed is further oxidized to the trioxide by conducting the gases mixed with air over a catalytic mass of platinum-black at a suitable temperature. It will be assumed that in the operation sufficient air is supplied to the pyrites burner that the oxygen shall be 40% in excess of that required if all the sulfur actually burned were oxidized to the trioxide. Of the pyrites charged, 15% is lost by falling through the grate with the " cinder " and is not burned. (a) Calculate the weight of air to be used per 100 lb of pyrites charged. (6) In the burner and a " contact shaft " connected with it, 40% of the sulfur burned is oonvertfed to the trioxide. Cal«ilatethecompo&itioa,byweight, of the gases leaving the contact shaft. (c) By means of the platinum catalytic mass, 96% of the sulfur dioxide remain- ing in the gases leaving the contact shaft is converted to the trioxide. Calculate the total weight of SO3 formed per 100 lb of pyrites charged. (d) Assuming that all gases from the contact shaft are passed through the catalyzer, calculate the composition by weight of the resulting gaseous products. (e) Calculate the overall degree of completion of the conversion of the sulfur in the pyrites charged to SO3 in the final products.
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
Related questions
Question
In the manufacture of sulfuric acid by the contact process iron pyrites, FeSj,
is burned in dry air, the iron being oxidized to Fe203. The sulfur dioxide thus
formed is further oxidized to the trioxide by conducting the gases mixed with air over
a catalytic mass of platinum-black at a suitable temperature. It will be assumed
that in the operation sufficient air is supplied to the pyrites burner that the oxygen
shall be 40% in excess of that required if all the sulfur actually burned were oxidized
to the trioxide. Of the pyrites charged, 15% is lost by falling through the grate with
the " cinder " and is not burned.
(a) Calculate the weight of air to be used per 100 lb of pyrites charged.
(6) In the burner and a " contact shaft " connected with it, 40% of the sulfur
burned is oonvertfed to the trioxide. Cal«ilatethecompo&itioa,byweight,
of the gases leaving the contact shaft.
(c) By means of the platinum catalytic mass, 96% of the sulfur dioxide remain-
ing in the gases leaving the contact shaft is converted to the trioxide.
Calculate the total weight of SO3 formed per 100 lb of pyrites charged.
(d) Assuming that all gases from the contact shaft are passed through the
catalyzer, calculate the composition by weight of the resulting gaseous
products.
(e) Calculate the overall degree of completion of the conversion of the sulfur in
the pyrites charged to SO3 in the final products.
Transcribed Image Text:11. In the manufacture of sulfuric acid by the contact process iron pyrites, FeSs,
is burned in dry air, the iron being oxidized to Fe,O. The sulfur dioxide thus
formed is further oxidized to the trioxide by conducting the gases mixed with air over
a catalytic mass of platinum-black at a suitable temperature. It will be assumed
that in the operation sufficient air is supplied to the pyrites burner that the oxygen
shall be 40% in excess of that required if all the sulfur actually burned were oxidized
to the trioxide. Of the pyrites charged, 15% is lost by falling through the grate with
the " cinder " and is not burned.
(a) Calculate the weight of air to be used per 100 lb of pyrites charged.
(b) In the burner and a " contact shaft " connected with it, 40% of the sulfur
burned is converted to the trioxide. Caleulate the composition, by weight,
of the gases leaving the contact shaft.
(c) By means of the platinum catalytic mass, 96% of the sulfur dioxide remain-
ing in the gases leaving the contact shaft is converted to the trioxide.
Calculate the total weight of SO3 formed per 100 Ib of pyrites charged.
(d) Assuming that all gases from the contact shaft are passed through the
catalyzer, calculate the composition by weight of the resulting gaseous
products.
(e) Calculate the overall degree of completion of the conversion of the sulfur in
the pyrites charged to SO, in the final products.
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