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We consider hydrogen production in a system where water from a fresh feed (FF1) enters an electrolysis reactor (R1). The water is completely converted to hydrogen and oxygen gas, which are fully separated from one another (V1). The hydrogen is sold, and the oxygen completely combusts (R2) a feed (FF2) of natural gas (CH4). This requires 10% excess oxygen. The exiting water is completely separated (V2) and recycled to R1. The carbon dioxide and oxygen are vented. Here Šk is the overhead recovery of species k in a separator. a) b) c) How much water and natural gas are needed as feed to produce 1000 kmol/h hydrogen? If the second separator (V2) did not perfectly separate CO₂ from water, and the overhead recovery of CO2 in V2 is now 0.95, does this change how much CO2 we emit relative to part (a)? Describe (qualitatively) what would happen to this process if we supplied the combustion reactor with less natural gas than what you calculated in part (a). How could it impact operating and capital cost? Note: combustion still occurs. 8 V1 2H202H2 +02 SH₂: 1 1 2 FF1 R1 502:0 FF2 V2 Sco₂: 0 SH₂:1 4 SH₂O: 0 02:1 5 3 co₂:1 R2 H20:0 7 CH4 +202 → 2H2O + CO₂

We consider hydrogen production in a system where water from a fresh feed (FF1) enters an electrolysis reactor (R1). The water is completely converted to hydrogen and oxygen gas, which are fully separated from one another (V1). The hydrogen is sold, and the oxygen completely combusts (R2) a feed (FF2) of natural gas (CH4). This requires 10% excess oxygen. The exiting water is completely separated (V2) and recycled to R1. The carbon dioxide and oxygen are vented. Here Šk is the overhead recovery of species k in a separator. a) b) c) How much water and natural gas are needed as feed to produce 1000 kmol/h hydrogen? If the second separator (V2) did not perfectly separate CO₂ from water, and the overhead recovery of CO2 in V2 is now 0.95, does this change how much CO2 we emit relative to part (a)? Describe (qualitatively) what would happen to this process if we supplied the combustion reactor with less natural gas than what you calculated in part (a). How could it impact operating and capital cost? Note: combustion still occurs. 8 V1 2H202H2 +02 SH₂: 1 1 2 FF1 R1 502:0 FF2 V2 Sco₂: 0 SH₂:1 4 SH₂O: 0 02:1 5 3 co₂:1 R2 H20:0 7 CH4 +202 → 2H2O + CO₂

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
Problem 1.1P
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We consider hydrogen production in a system where water from a fresh feed (FF1) enters an electrolysis reactor (R1). The water is completely converted to hydrogen and oxygen gas, which are fully separated from one another (V1). The hydrogen is sold, and the oxygen completely combusts (R2) a feed (FF2) of natural gas (CH4). This requires 10% excess oxygen. The exiting water is completely separated (V2) and recycled to R1. The carbon dioxide and oxygen are vented. Here Šk is the overhead recovery of species k in a separator. a) b) c) How much water and natural gas are needed as feed to produce 1000 kmol/h hydrogen? If the second separator (V2) did not perfectly separate CO₂ from water, and the overhead recovery of CO2 in V2 is now 0.95, does this change how much CO2 we emit relative to part (a)? Describe (qualitatively) what would happen to this process if we supplied the combustion reactor with less natural gas than what you calculated in part (a). How could it impact operating and capital cost? Note: combustion still occurs. 8 V1 2H202H2 +02 SH₂: 1 1 2 FF1 R1 502:0 FF2 V2 Sco₂: 0 SH₂:1 4 SH₂O: 0 02:1 5 3 co₂:1 R2 H20:0 7 CH4 +202 → 2H2O + CO₂
Transcribed Image Text:We consider hydrogen production in a system where water from a fresh feed (FF1) enters an electrolysis reactor (R1). The water is completely converted to hydrogen and oxygen gas, which are fully separated from one another (V1). The hydrogen is sold, and the oxygen completely combusts (R2) a feed (FF2) of natural gas (CH4). This requires 10% excess oxygen. The exiting water is completely separated (V2) and recycled to R1. The carbon dioxide and oxygen are vented. Here Šk is the overhead recovery of species k in a separator. a) b) c) How much water and natural gas are needed as feed to produce 1000 kmol/h hydrogen? If the second separator (V2) did not perfectly separate CO₂ from water, and the overhead recovery of CO2 in V2 is now 0.95, does this change how much CO2 we emit relative to part (a)? Describe (qualitatively) what would happen to this process if we supplied the combustion reactor with less natural gas than what you calculated in part (a). How could it impact operating and capital cost? Note: combustion still occurs. 8 V1 2H202H2 +02 SH₂: 1 1 2 FF1 R1 502:0 FF2 V2 Sco₂: 0 SH₂:1 4 SH₂O: 0 02:1 5 3 co₂:1 R2 H20:0 7 CH4 +202 → 2H2O + CO₂
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