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Study on biologically enhanced redox solution reoxidation.

机译：生物增强氧化还原溶液再氧化的研究。

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摘要

LO-CAT processes use chelated iron in aqueous solution as a redox material for absorption of hydrogen sulfide from sour natural gas streams and convert the dissolved species to elemental sulfur by oxidation. The reduced iron chelate is then re-oxidized by passing air or oxygen through the solution, and then recycled. But this requires equipment for regeneration, chemicals that degrade and energy for air and liquid circulation. The specific objective of this project jointly supported by the U.S. Department of Energy, Gas Research Institute, Texas Higher Education Co-ordinating Board is to advance the technology of the commercial iron-based chelate processes utilizing biologically-enhanced re-oxidation of the redox solutions used in these processes, such as the ARI LO-CAT 310C.;The main goal of this project was to evaluate the effect of the bacteria Thiobacillus ferrooxidans, Thiobacillus denitrificans and the Chilean Cultures, ORE 3, on re-oxidation rate of reduced iron chelate. Gas streams containing hydrogen sulfide in concentrations of 0.5% and 5% were used with a mature solution redox system in a batch reactor with a working volume of one liter.;The mature solution contained 1000 ppm chelated iron catalyst prepared by dilution of an appropriate quantity of the commercial iron chelate concentrate, ARI-310C, together with a buffer, stabilizer and chelon degradation products. An enhancement of 100% or higher in the re-oxidation rate using the bacteria is desired for commercial applications. The laboratory experiments showed that all of the bacterial strains studied enhance the re-oxidation rate significantly as compared to the rate in the absence of bacteria at both H2S concentrations used. However, Thiobacillus denitrificans produced the best results, with rate enhancements of up to 300%.
机译：LO-CAT工艺使用水溶液中的螯合铁作为氧化还原材料，从酸性天然气流中吸收硫化氢，并通过氧化将溶解的物质转化为元素硫。然后，使空气或氧气通过溶液，使还原的铁螯合物再氧化，然后再循环。但这需要用于再生的设备，降解的化学物质以及用于空气和液体循环的能量。该项目的具体目标是由美国能源部，天然气研究所，德克萨斯州高等教育协调委员会共同支持的，目的是利用氧化还原溶液的生物增强再氧化技术来推进商业化的铁基螯合工艺技术。在这些过程中使用，例如ARI LO-CAT 310C .;该项目的主要目的是评估细菌铁氧化硫杆菌，反硝化硫杆菌和智利文化ORE 3对还原铁再氧化率的影响螯合。在分批反应器中将浓度为0.5％和5％的硫化氢的气体流与成熟溶液氧化还原系统一起使用，工作量为1升;该成熟溶液包含1000 ppm的螯合铁催化剂，通过稀释适当量制备商用铁螯合物浓缩物ARI-310C，以及缓冲剂，稳定剂和螯合物降解产物。使用细菌期望将细菌的再氧化率提高100％或更高。实验室实验表明，与所使用的两种硫化氢浓度下均不存在细菌的情况相比，所研究的所有细菌菌株均显着提高了再氧化速度。但是，反硝化硫杆菌产生的效果最好，速率提高了300％。

著录项

  • 作者

    Pal, Devashish R.;

  • 作者单位

    Texas A&M University - Kingsville.;

  • 授予单位 Texas A&M University - Kingsville.;
  • 学科 Chemical engineering.
  • 学位 M.S.
  • 年度 2001
  • 页码 183 p.
  • 总页数 183
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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