Disclosed in certain embodiments are methods of removing water from a gas feed stream comprising hydrocarbons and water during an adsorption step of an adsorption cycle.

An evaporated fuel adsorption device or canister includes a first chamber and a second chamber fluidly interconnected through a communication region. The first chamber includes at least one first adsorbing sub-chamber and at least one first stabilizing sub-chamber. The second chamber includes at least one second adsorbing sub-chamber, at least one second stabilizing sub-chamber and at least one tapered adsorbing sub-chamber, all fluidly connected to one another, in series.

Systems and processes for use of concentric adsorbent beds with rotary valve assemblies are provided.

Biogas containing H.sub.2S and CO.sub.2 is upgraded by removing H.sub.2S using PTSA and CO.sub.2 using two stages of gas separation membranes. The first stage permeate may optionally be used a regeneration gas stream. The second stage permeate may optionally be used a cool down gas stream. The PTSA unit includes two or more adsorbent beds each selective for water, VOCs, and H.sub.2S over CO.sub.2 and for H.sub.2S over methane.

A fuel vapor processing apparatus may include a first adsorption chamber, a second adsorption chamber and a third adsorption chamber that are connected in series with respect to a flow of gas. A ratio of a length to a diameter of the second adsorption chamber may be larger than that of the first adsorption chamber. A cross sectional area of each of the second and third adsorption chambers may be smaller than a cross sectional area of the first adsorption chamber.

Disclosed is a method of sequentially separating and recovering one or more NGLs (129, 229) from a natural gas feedstream (3). Specifically, a raw natural gas feedstream (3) is passed through two or more NGLs separation unit (100, 200) wherein each separation unit removes one or more NGLs from the natural gas feedstream to provide a methane-rich natural gas supply (205). Each separation unit employs an adsorption media and has an adsorption step and a media regeneration step wherein the regeneration step may be operated as a batch process, a semi-continuous process, or a continuous process. One embodiment of this method provides for the use of a different regenerable adsorbent media in each separation unit.

A temperature swing adsorption apparatuses and process is disclosed comprising passing a feed stream to a first adsorption bed to adsorb one or more contaminants from the feed stream to produce a product stream. A regeneration gas separator overhead stream is passed to a second adsorption bed to provide a second adsorption bed effluent stream. The second adsorption bed effluent stream is passed to a heater to generate a hot regeneration effluent stream. The hot regeneration effluent stream is passed to a third adsorption bed to regenerate the third adsorption bed and provide a regeneration effluent stream. At least a portion of the regeneration effluent stream is passed to a guard bed to remove sulfur and oxygen compounds to provide a treated regeneration effluent stream. The treated regeneration effluent stream is passed to a regeneration gas separator to provide the regeneration gas separator overhead stream.

A dehumidifier includes a first air distribution assembly connected to a process air inlet for receiving process air, and to a regeneration air outlet for exhausting regeneration air; and a second air distribution assembly connected to a process air outlet for delivering process air, and to a regeneration air inlet for receiving regeneration air. The dehumidifier includes multiple stationary modules connected in parallel between the air distribution assemblies. Each module contains desiccant and has opposing apertures for connecting to the air distribution assemblies. The air distribution assemblies are configured to cycle between a number of positions equal to the number of modules. In each position, the air distribution assemblies establish a regeneration air flow from the regeneration air inlet to the regeneration air outlet via one module, and a plurality of process air flows from the process air inlet to the process air outlet via each remaining module.

A device for drying compressed gas with an inlet for compressed gas to be dried originating from a compressor and an outlet for dried compressed gas, whereby this device comprises a number of vessels that are filled with a regeneratable drying agent and a controllable valve system that connects the aforementioned inlet and outlet to the aforementioned vessels, wherein the device comprises at least three vessels, whereby the aforementioned valve system is such that at least one vessel is always being regenerated, while the other vessels dry the compressed gas, whereby due to the control of the valve system the vessels are each successively regenerated in turn.

Provided is a canister that can inhibit discharge of evaporated fuel to the atmosphere. One aspect of the present disclosure is a canister. The canister includes a charge port, a purge port, an atmosphere port, a main chamber to which a charge port and a purge port are connected, a sub chamber to which the atmosphere port is connected, an intermediate chamber arranged between the main chamber and the sub chamber in a flow path of an evaporated fuel, the intermediate chamber being connected to each of the main chamber and the sub chamber, a first adsorbent stored in the main chamber, second adsorbent stored in the sub chamber, and a third adsorbent stored it intermediate chamber. An adsorption capacity of the third adsorbent is smaller than each of an adsorption capacity of the first adsorbent and an adsorption capacity of the second adsorbent.