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Bonus report: Gas processing developments: Fine-tuning demercaptanization process: A case study

Mallaki, Z ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. Publisher: 2009
  3. Abstract:
  4. A case study conducted to find a cost-effective method to treat 1.2 wt % (12,000 ppm) sulfur content LPG streams to < 30 ppm is presented. Propane feed contains methyl mercaptan and carbonyl sulfide (COS) with small amounts of ethyl mercaptan and only traces of H2S. The butane feed contains ethyl mercaptan, with small amounts of methyl mercaptan and only traces of H2S and COS. Caustic concentration of 14.93 wt % and 40°C are optimum values for extractors. The required amount of caustic to extract mercaptans can be selected according to the purity of the product. The optimum log mean temperature of the oxidizer is 40°-45°C depending on the impurities concentration. The optimum caustic concentration of 1.9 molar after mixing with air is the optimum value within the oxidizer, which can be adjusted by fresh caustic makeup. However, the required concentration of recycling caustic to the extractor as well as the amount of sodium mercaptide impurities in the rich caustic are limiting factors for the unit
  5. Keywords:
  7. Source: Hydrocarbon Processing ; Volume 88, Issue 3 , 2009 , Pages 48-54 ; 00188190 (ISSN)