Process studies for a new method of removing H/sub 2/S from industrial gas streams
A process for the removal of hydrogen sulfide from coal-derived gas streams has been developed. The basis for the process is the absorption of H/sub 2/S into a polar organic solvent where it is reacted with dissolved sulfur dioxide to form elemental sulfur. After sulfur is crystallized from solution, the solvent is stripped to remove dissolved gases and water formed by the reaction. The SO/sub 2/ is generated by burning a portion of the sulfur in a furnace where the heat of combustion is used to generate high pressure steam. The SO/sub 2/ is absorbed into part of the lean solvent to form the solution necessary for the first step. The kinetics of the reaction between H/sub 2/S and SO/sub 2/ dissolved in mixtures of N,N-Dimethylaniline (DMA)/Diethylene Glycol Monomethyl Ether and DMA/Triethylene Glycol Dimethyl Ether was studied by following the temperature rise in an adiabatic calorimeter. The reaction provides a foundation for the development of a process for removing H/sub 2/S from a fuel gas made by gasifying high-sulfur coal. A computer simulation was written to permit rapid analysis of potential process alternatives. Calculations in the simulation were performed in unit sequential fashion with convergence accelerated using Wegstein's method. Modifications were made to standard engineering unit models to account for the presence of the reaction between H/sub 2/S and SO/sub 2/. A flowsheet and detailed heat and material balances for a process for the reduction of the H/sub 2/S content of a gasified coal stream from 60,000 to 1 ppM are presented.
- Research Organization:
- California Univ., Berkeley (USA)
- OSTI ID:
- 5405835
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
FUEL GAS
PURIFICATION
HYDROGEN SULFIDES
ADSORPTION
ORGANIC SOLVENTS
POLAR COMPOUNDS
REACTION KINETICS
SOLVENT PROPERTIES
CHALCOGENIDES
FLUIDS
FUELS
GAS FUELS
GASES
HYDROGEN COMPOUNDS
KINETICS
SOLVENTS
SORPTION
SULFIDES
SULFUR COMPOUNDS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
010900 - Coal
Lignite
& Peat- Environmental Aspects