Mass-Transfer Characteristics for Gas-Liquid Reaction of H2S and Sulfuric Acid in a Packed Column
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- 作者：Hui Wang ; Ivo G. Dalla Lana ; and Karl T. Chuang
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2004
- 出版时间：September 1, 2004
- 年：2004
- 卷：43
- 期：18
- 页码：5846 - 5853
- 全文大小：98K
- 年卷期：v.43,no.18(September 1, 2004)
- ISSN：1520-5045
文摘
The mass-transfer characteristics of a gas-liquid reaction system in a packed column filledwith ceramic Raschig rings were studied using the reaction between hydrogen sulfide (H2S)and sulfuric acid solutions. An analysis based on two-film theory shows that the mass-transferresistance consists of two consecutive steps: gas-side mass transfer and surface reaction. Theresistance from the liquid side was negligible because the concentration of sulfuric acid wasabove stoichiometric and can be regarded as a constant. Onda et al.'s correlations (Onda, K.;Takeuchi, H.; Okumoto, Y. J. Chem. Eng. Jpn. 1968, 1, 56) are able to estimate the effectiveinterfacial area as well as the mass-transfer coefficients for our reactor system. Because thereaction between H2S and concentrated sulfuric acid is a pseudo-first-order reaction with respectto H2S under the experimental conditions used, the approximate equality between the measuredoverall mass-transfer coefficient and the reaction rate constant suggests the regime of reactionrate control. In other words, the comparison between the rate constants and mass-transfercoefficient is able to show the rate-controlling regimes in terms of operating conditions such asacid concentration, temperature, and acid and gas flow rates. Tests were also carried out withgaseous compounds often found in industrial H2S streams. No reaction was observed for methane,carbon dioxide, carbonyl sulfide, and carbon disulfide. However, the conversion of ethylene wasabout 20%, and those of mercaptan and thiophene were nearly 100%. This study provides usefuldata that can facilitate scale-up calculations of this potential sulfur removal and recoverytechnology.