Kees Smit, Shell Global Solutions, Netherlands
Molecular sieves can be used in a temperature-swing adsorption process downstream an amine or physical solvent to remove water traces of mercaptans and other sulphur species. The design and operation of the mol sieve unit involves a number of challenges due to possible BTX co-adsorption and potentially fast deactivation of the sieves. In addition, the transient nature of the temperature-swing adsorption process introduces challenges in the design of the sulphur recovery unit (SRU) and the regeneration-gas treating for the mol sieve unit. Deactivation can be mitigated using a novel regeneration process, while transients in the regeneration gas can be smoothed using a peak-shaving scheme.
These and other process and engineering solutions to design and operational challenges encountered by Shell Global Solutions are discussed herein.
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