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Hydrogen sulfide (H2S) is a naturally occurring gas contained in many of the world¡¯s crude oils. It is also generated by the cracking and catalytic desulfurization of petroleum fractions during the refining process. Because the average sulfur content of crude oils being processed in petroleum refineries worldwide is increasing (Figure 1), problems specific to the handling of hydrocarbons containing higher concentrations of reactive sulfur compounds such as hydrogen sulfide may become more widespread. The storage and handling of H2S-laden oils presents a number of safety and operational concerns. For example,hydrocarbons with high concentrations of hydrogen sulfide are hazardous to handle, can cause corrosion in storage tanks and can create odor problems. The issues caused by H2S are often managed with process and engineering controls. However, when these practices are insufficient refiners and terminal operators can use chemical scavengers to address H2S-related issues. Because of the variety of programs available to address H2S problems, a good understanding of the various solutions is critical to the successful abatement of H2S. Correctly applied, hydrogen sulfide scavengers can allow refiners and terminal operators to handle high H2S hydrocarbons in a safe and profitable manner.2 |
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