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Production of Elemental Sulfur from Spent Sorbent and CO2: Final Report - 1994

Tim C. Keener, Ph.D

The Department of Civil and Environmental Engineering

In the pdf format this document has 145 pages and is 4.12MB.

Table of Contents

LIST OF FIGURES

iv
LIST OF TABLES viii
EXECUTIVE SUMMARY ix
INTRODUCTION 1

PHASE 1

 BASIC STUDIES 8
 

Task #1

 CaS Solubility Studies 8

Task #2

 H2S Stripping Studies 15
  Experimental Aooaratus 15
  Experimental Procedure 18
Mathematic Model for the Mass Transfer Coefficient 18
Work Performance / Results Obtained 26
Accuracy and Precision of the Data 39

Task #3

 CaCO3 Regeneration Studies 41
 
PHASE 2 ELEMENTAL SULFUR PRODUCTION STUDIES 51
  Introduction/Objectives 51
Background and Literature Review 51
  Clause Process 51
Thermal Decomposition of H2S without Catalyst 53
Thermal Decomposition of H2S with Catalyst 55
Thermal Decomposition of H2S while Products are Continually Removed 57
Oxidation of H2S by O2 57
Partial Oxidation of H2S by CO2 58

Task #1

 Thermodynamic Analysis 60
  Effects of the Temperature and Pressure 61
Effects of the Ratio of H2S to CO2 72

Task #2

 Catalyst Preparation 72
  Introduction 72
Apparatus 74
Procedure 75
Work Performed/Results Obtained 76

Task #3

 Testing of Packed Bed Catalytic Reactor 79
  Apparatus 79
Procedure 81
Work Performed/ Results Obtained 83
  Sulfur Conversion 83
Effect of CO2 89
Discussion on Equilibrium 90
Results from Gas Chromatographic Analysis 90
Phase 3 INTEGRATED SYSTEMS DESIGN 93
  Introduction 93
Experimental Apparatus and Procedure 93
Work Performed and Results Obtained 95
CONCLUSIONS 100
REFERENCES 103
APPENDICES 106
  Appendix A Measured Data Versus Model Predictions for the H2S Stripping Experiments 106
Appendix B Phase 1 Experimental Data; Calculation of Bubble Size; Calculation of Equilibrium Constants and Sulfur Mass Balance 116
Appendix C Calculation of Theoretical Conversion 127
Appendix D Derivation of Equation for Specific Rate Coefficient 128
Appendix E Calculation of Retention Time in Catalyst Bed 131