Kinetics of reaction of sulfide with thiosulfate in aqueous solution

Journal Article · Thu Apr 01 04:00:00 EST 1999 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie980537+· OSTI ID:345336

Siu, T; Jia, C Q ^[1]

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1. Univ. of Toronto, Ontario (Canada). Dept. of Chemical Engineering and Applied Chemistry

The kinetics of the reaction 2H{sub 2}S(aq) + S{sub 2}O{sub 3}{sup 2{minus}} + 2H{sup +} {r_arrow} 1/2S{sub 8}(s) + 3H{sub 2}O has been investigated at 0--40 C in the pH interval from 5 to 7. The rate law was found to be r = {minus}d[S{sub 2}O{sub 3}{sup 2{minus}}]/dt = {kappa}[H{sub 2}S][S{sub 2}O{sub 3}{sup 2{minus}}], where {kappa} = 8 {times} 10{sup 11} exp({minus}74,300/RT) M{sup {minus}1} s{sup {minus}1}. Thermodynamic calculation shows that the reaction is unfavorable at pH {ge} 8, which is confirmed by the experimental observation. The ionic strength effect on the reaction also has been studied. The mechanism postulated to account for the observed rate law involves the formation and subsequent reactions of an intermediate H{sub 2}S{sub 3}O{sub 3}{sup 2{minus}}.

• OSTI ID: 345336
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 4 Vol. 38; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
54 ENVIRONMENTAL SCIENCES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DESULFURIZATION
FLUE GAS
HYDROGEN SULFIDES
KINETIC EQUATIONS
MATERIALS RECOVERY
SULFUR
THIOSULFATES