Methods of removing contaminants from hydrocarbon stream by swing adsorption and related apparatus and systems

A cyclical swing adsorption process for removing contaminants from a gaseous feed stream, the process comprising:

• a) passing a gaseous feed stream at a feed pressure through an adsorbent bed for an adsorption time interval greater than 1 second and less than 60 seconds to separate one or more contaminants from the gaseous feed stream to form a product stream;
• b) interrupting the flow of the gaseous feed stream;
• c) performing a plurality of depressurization steps, wherein each depressurization step reduces the pressure within the adsorbent bed from a depressurization initial pressure to a depressurization final pressure;
• d) passing a purge stream into the adsorbent bed to remove hydrocarbons from the adsorbent bed;
• e) subjecting the purged adsorbent bed to one or more blow-down steps, wherein each blow-down step reduces the pressure within the adsorbent bed from a blow-down initial pressure to a blow-down final pressure;
• f) performing a plurality of re-pressurization steps, wherein each re-pressurization step increases the pressure within the swing adsorption bed from re-pressurization initial pressure to a re-pressurization final pressure;
• and
• g) repeating the steps a) to f) for at least one additional cycle.

A cyclical pressure swing adsorption process for removing contaminant from a gaseous feed stream, the process comprising:

• introducing a gaseous feed stream comprising a desired product and one or more contaminants above a contaminant threshold, wherein the one or more contaminants comprise one or more of 1 to 80 mole percent CO2, less than 1 mole percent H2S, and any combination thereof, and wherein the contaminant threshold comprises one or more of less than 10 parts per million H2S;
• less than 4 mole percent CO2, and any combination thereof;
• subjecting the gaseous feed stream to a pressure swing adsorption process within an adsorbent bed for an adsorption time interval greater than 1 second and less than 60 seconds to separate the one or more contaminants from the gaseous feed stream to form a product stream, wherein the pressure swing adsorption process recovers greater than 90% of the desired product based on a ratio of the desired product in the product stream divided by the desired product in the gaseous feed stream;
• conducting away from the adsorbent bed a product stream having contaminants below the contaminant threshold.