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A Claus plant converts gaseous sulfur compounds to elemental sulfur, thereby eliminating emissions of sulfur into the atmosphere. This is important, as these emissions are both toxic and cause acid rain. The process can be especially important in the gasification of coal, which contains significant amounts of sulfur that is converted to H2S during gasification. In the Claus process, the H2S-rich product recovered from an acid gas removal system following the gasifier is split, with one-third going to a furnace where the hydrogen sulfide is burned at 1 atm with a stoichiometric amount of air to form SO2. H2S + 1.502→ SO2 + H2O The hot gases leave the furnace and are cooled prior to being mixed with the remainder of the H2S-rich gases. The mixed gases are then fed into a catalytic reactor, in which hydrogen sulfide and sulfur dioxide react and form elemental sulfur and water. 2H2S + SO2 → 3S + 2H2O The coal fed to the gasification process contains 0.6% S by weight. All sulfur is converted to H2S in the gasifier, which is then fed to the Claus plant. 1. Draw a schematic of the process Estimate the feed rate of air to the Claus plant in kg/kg coal. 3. While the removal of sulfur emissions to the atmosphere is environmentally desirable, identify 2. an additional environmental concern that needs to be addressed about the products of the Claus process.

A Claus plant converts gaseous sulfur compounds to elemental sulfur, thereby eliminating emissions of sulfur into the atmosphere. This is important, as these emissions are both toxic and cause acid rain. The process can be especially important in the gasification of coal, which contains significant amounts of sulfur that is converted to H2S during gasification. In the Claus process, the H2S-rich product recovered from an acid gas removal system following the gasifier is split, with one-third going to a furnace where the hydrogen sulfide is burned at 1 atm with a stoichiometric amount of air to form SO2. H2S + 1.502→ SO2 + H2O The hot gases leave the furnace and are cooled prior to being mixed with the remainder of the H2S-rich gases. The mixed gases are then fed into a catalytic reactor, in which hydrogen sulfide and sulfur dioxide react and form elemental sulfur and water. 2H2S + SO2 → 3S + 2H2O The coal fed to the gasification process contains 0.6% S by weight. All sulfur is converted to H2S in the gasifier, which is then fed to the Claus plant. 1. Draw a schematic of the process Estimate the feed rate of air to the Claus plant in kg/kg coal. 3. While the removal of sulfur emissions to the atmosphere is environmentally desirable, identify 2. an additional environmental concern that needs to be addressed about the products of the Claus process.

Introduction to Chemical Engineering Thermodynamics
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
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A Claus plant converts gaseous sulfur compounds to elemental sulfur, thereby eliminating emissions of sulfur into the atmosphere. This is important, as these emissions are both toxic and cause acid rain. The process can be especially important in the gasification of coal, which contains significant amounts of sulfur that is converted to H2S during gasification. In the Claus process, the H2S-rich product recovered from an acid gas removal system following the gasifier is split, with one-third going to a furnace where the hydrogen sulfide is burned at 1 atm with a stoichiometric amount of air to form SO2. H2S + 1.502→ SO2 + H20 The hot gases leave the furnace and are cooled prior to being mixed with the remainder of the H2S-rich gases. The mixed gases are then fed into a catalytic reactor, in which hydrogen sulfide and sulfur dioxide react and form elemental sulfur and water. 2H2S + SO2 → 3S + 2H2O The coal fed to the gasification process contains 0.6% S by weight. All sulfur is converted to H2S in the gasifier, which is then fed to the Claus plant. 1. Draw a schematic of the process 2. Estimate the feed rate of air to the Claus plant in kg/kg coal. 3. While the removal of sulfur emissions to the atmosphere is environmentally desirable, identify an additional environmental concern that needs to be addressed about the products of the Claus process.
Transcribed Image Text:A Claus plant converts gaseous sulfur compounds to elemental sulfur, thereby eliminating emissions of sulfur into the atmosphere. This is important, as these emissions are both toxic and cause acid rain. The process can be especially important in the gasification of coal, which contains significant amounts of sulfur that is converted to H2S during gasification. In the Claus process, the H2S-rich product recovered from an acid gas removal system following the gasifier is split, with one-third going to a furnace where the hydrogen sulfide is burned at 1 atm with a stoichiometric amount of air to form SO2. H2S + 1.502→ SO2 + H20 The hot gases leave the furnace and are cooled prior to being mixed with the remainder of the H2S-rich gases. The mixed gases are then fed into a catalytic reactor, in which hydrogen sulfide and sulfur dioxide react and form elemental sulfur and water. 2H2S + SO2 → 3S + 2H2O The coal fed to the gasification process contains 0.6% S by weight. All sulfur is converted to H2S in the gasifier, which is then fed to the Claus plant. 1. Draw a schematic of the process 2. Estimate the feed rate of air to the Claus plant in kg/kg coal. 3. While the removal of sulfur emissions to the atmosphere is environmentally desirable, identify an additional environmental concern that needs to be addressed about the products of the Claus process.
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