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Shell–Paques process
The Shell–Paques process, also known by the trade name of Thiopaq O&G,〔(''Thiopaq Process Description'' )〕 is a gas desulfurization technology for the remvoal of hydrogen sulfide from natural-, refinery-, synthesis- and biogas. The process was initially named after the Shell Oil and Paques purification companies. After accession of a dedicated joint venture by the founders, Paqell B.V., the trade name for applications in the Oil & Gas industry was changed to "THIOPAQ O&G". It is based on the biocatalytical conversion of sulfide into elemental sulfur. It operates at near-ambient conditions of temperature, about 30-40 °C, and pressure which results in inherent safety. It is an alternative to, for example, the Claus process.
==Process chemistry==
Each reaction can be applied individually or sequentially as dictated by the characteristics of the stream to be treated. The process consist of three main sections: An absorber (gas washing section), a bioreactor (sulfide oxidation and regeneration of washing liquid) and Sulfur handling section as shown in the figure below:
The washing step uses a dilute alkaline solution to remove hydrogen sulfide (H2S) from the sour gas according to:
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