Low Temperature Catalytic Oxidation of Hydrogen Sulfide in Sour Produced Wastewater Using Activated Carbon Catalysts
| Autor: | Eric L. Tollefson, Ajay K. Dalai, A. Majumdar |
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| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | Environmental Science & Technology. 33:2241-2246 |
| ISSN: | 1520-5851 0013-936X |
| Popis: | A process is proposed for the removal of H{sub 2}S from sour produced wastewater at lower temperatures (< 25 C) using an activated carbon as a catalyst and oxygen in air as an oxidizing agent. Hydrodarco-activated carbon catalyst was successfully used in this process in a continuous-flow stirred-tank reactor (CFSTR) in an aqueous solution with a pH of 3--10, and temperature and residence time of the feed in the reactor ranging from 8 to 24 C and 5.2 to 18.6 min, respectively. This catalyst has higher activity than that of Calgon catalyst in this process. The H{sub 2}S conversion was increased with temperature, the conversion approaching 100% at 24 C after 90 min of operation at a pH of 4.5 and a residence time of 11.4 min. The Hydrodarco-activated carbon was capable of sorbing 0.66 g of sulfur/g of carbon before its activity decreased significantly giving conversions below 90%. In a CFSTR, for the sour water with a pH value of 4.5, the rate of H{sub 2}S oxidation in the temperature range 8--24 C was {minus}r{sub H{sub 2}S} = (5.072 {times} 10{sup 10} ({micro}mol/L){sup 0.76}(1/min)) exp({minus}21.3 kJ/mol/RT)[H{sub 2}S]{sup 0.24}, [{micro}mol/(L min)]. |
| Databáze: | OpenAIRE |
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