Development of a zero-emissions sulfur-recovery process: 2. Sulfur-recovery process based on the reactions of H[sub 2]S and CO[sub 2] at high temperature

Journal Article · Mon Nov 01 00:00:00 EST 1993 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00023a051· OSTI ID:5537436

Towler, G P; Lynn, S ^[1]

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

When H[sub 2]S is heated above 600 C in the presence of CO[sub 2], elemental sulfur and synthesis gas are formed. A sulfur-recovery process using this chemistry is as follows: H[sub 2]S is heated in a high-temperature reactor in the presence Of CO[sub 2] and a suitable catalyst. The primary products of the overall reaction are S[sub 2], CO, H[sub 2], and H[sub 2]O. Small amounts of COS, SO[sub 2], and CS[sub 2] also form. Rapid quenching of the reaction mixture to roughly 600 C prevents loss Of S[sub 2] during cooling. Carbonyl sulfide is removed from the product gas by hydrolysis back to CO[sub 2] and H[sub 2]S. Unreacted CO[sub 2] and H[sub 2]S are removed from the product gas and recycled to the reactor, leaving a gas consisting chiefly of H[sub 2] and CO, which recovers the hydrogen value from the H[sub 2]S. This process is economically favorable compared to the existing sulfur-recovery technology and allows emissions of sulfur-containing gases to be controlled to very low levels.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5537436
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Vol. 32:11; ISSN 0888-5885
• Country of Publication: United States
• Language: English

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