Removal of H[sub 2]S from coal gas using limestone: Kinetic considerations

Journal Article · Tue Feb 01 04:00:00 EST 1994 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00026a014· OSTI ID:7067360

Fenouil, L A; Towler, G P; Lynn, S ^[1]

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1. Lawrence Berkeley Lab., CA (United States) Univ. of California, Berkeley, CA (United States). Dept. of Chemical Engineering

The calcium carbonate contained in limestone becomes thermodynamically capable of sorbing hydrogen sulfide from high-pressure coal gas at temperatures above 600 C, typically well below the calcination temperature. Limestone can be used more effectively as a sorbent for hydrogen sulfide in high-temperature gas-cleaning applications if it is prevented from undergoing calcination since calcium oxide may sinter rapidly. For large (millimeter) sized particles typically used in gas cleaning, sintering of uncalcined limestone was found to be insignificant in the temperature range 750--900 C. Poor conversion of the solid upon reaction with H[sub 2]S is caused by sintering of the CaS product layer, which can be seen from scanning electron microscopy photographs. Sintering of CaS is rapid in an atmosphere that contains CO[sub 2], but is slow under N[sub 2] or H[sub 2]. The kinetics of CaS sintering under CO[sub 2] was determined for the temperature range 750--900 C.

• OSTI ID: 7067360
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Journal Name: Industrial and Engineering Chemistry Research; (United States) Vol. 33:2; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM SULFIDES
CARBONATE ROCKS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL GASIFICATION
DESULFURIZATION
FLUIDS
FUEL GAS
FUELS
GAS FUELS
GASES
GASIFICATION
HOT GAS CLEANUP
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
KINETICS
LIMESTONE
PURIFICATION
REACTION KINETICS
REMOVAL
ROCKS
SEDIMENTARY ROCKS
SULFIDATION
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES