March 2009

Bonus Report: Gas Processing Developments

Fine-tuning demercaptanization process: A case study

Optimizing caustic concentrations and reactor temperatures improved acidic compound removal without installing new equipment

Farhadi, F., Sharif University of Technology; Mallaki, Z., Sharif University of Technology and Petro Pars Ltd

Liquefied petroleum gas (LPG) is often contaminated with acidic compounds such as hydrogen sulfide (H2S), carbon dioxide (CO2), carbonyl sulfide (COS), carbon disulfide (CS2), and methyl and ethyl mercaptans (thiols). Mercaptans in lighter feeds, such as C3s, C4s, LPG and naphtha, are extracted with caustic solution processes, which are also referred to as "sweetening" processes. Sweetening processes are widely applied to remove acid compounds before transporting LPG for sale purposes. Tighter environmental rules now require reducing the sulfur content of LPG to 30 ppm. In this case study, an investigation is conducted to find a cost-effective method to treat 1.2 wt% (12,000 ppm) sulfur-co

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