A pressure swing adsorption (PSA) system for purifying a feed gas is provided. The PSA system may have a first adsorber bed and a second adsorber bed, each having a feed port, a product port, and adsorbent material designed to adsorb one or more impurities from the feed gas to produce a product gas. The PSA system may also have a network of piping configured to direct the feed gas to the feed ports of the adsorber beds and direct the product gas to and from the product ports of the adsorber beds. The network of piping may also be configured to transfer gas between the first adsorber bed and the second adsorber bed during a pressure equalization step and a purge step. The PSA system may also have a first valve configured to direct flows of the feed gas and the product gas through the network of piping. The PSA system may further have a first orifice configured to regulate a flow rate of gas between the first adsorber bed and the second adsorber bed during at least one of the pressure equalization step and the purge step.

Processes and apparatuses for reducing molecular weight fluctuation in a tail gas stream from a pressure swing adsorption process. Multiple PSA separation zone are synchronized such that when one of the PSA units is generating a low molecular weight tail gas, there is another PSA unit generating a high molecular weight tail gas.

This description relates to removing CO2 from the air. One example includes a duct extending from an external environment to an internal environment and a fan configured to move air through the duct. The example also includes first and second CO2 removal assemblies configured to alternatively transition between CO2 adsorption mode and CO2 desorption mode so that one of either the first and second CO2 removal assemblies is in CO2 adsorption mode and receiving at least some of the air moving through the duct while the other of the first and second CO2 removal assemblies is not receiving air moving through the duct while CO2 is removed in desorption mode.

Method for drying a gas by feeding the gas into a series of at least two chambers containing each a regenerable adsorbent for drying said gas and meanwhile to feed a part of the dried gas into a series of at least two other chambers while those other chambers are vented, in order to regenerate the adsorbent contained into these two other chambers. Meanwhile, a blower feeds air from an air intake into at least one of the at least two other chambers in order to improve the regeneration of their adsorbent. An apparatus that is adapted to implement the method, is also disclosed.

A portable pressure swing adsorption system and method for fuel gas conditioning. A fuel gas conditioning system includes a pressure swing adsorption (PSA) system fluidly coupled to a compressed rich gas stream, the PSA system including a plurality of adsorbent beds and configured to condition the compressed rich natural gas stream and produce therefrom a high-quality fuel gas and gaseous separated heavier hydrocarbons, a product end of the adsorbent beds fluidly coupled to a fuel gas line, and a feed end of the adsorbent beds configured to be fluidly coupled to the compressed rich natural gas stream or a raw natural gas stream, wherein the produced gaseous separated heavier hydrocarbons are desorbed at at least 50 psia and recirculated into the rich natural gas stream or the raw natural gas stream without post-desorption compression.

An evaporative emission control canister system comprises an initial adsorbent volume having an effective incremental adsorption capacity at 25 C. of greater than 35 grams n-butane/L between vapor concentration of 5 vol % and 50 vol % n-butane, and at least one subsequent adsorbent volume having an effective incremental adsorption capacity at 25 C. of less than 35 grams n-butane/L between vapor concentration of 5 vol % and 50 vol % n-butane, an effective butane working capacity (BWC) of less than 3 g/dL, and a g-total BWC of between 2 grams and 6 grams. The evaporative emission control canister system has a two-day diurnal breathing loss (DBL) emissions of no more than 20 mg at no more than 210 liters of purge applied after the 40 g/hr butane loading step.

A hydrogen purification system includes a dryer system having a plurality of dryers each having an adsorption bed for drying hydrogen gas configured to adsorb moisture in the adsorption bed from the hydrogen gas in an adsorption mode. The dryer is configured to remove moisture from the adsorption bed in a regeneration mode. The plurality of dryers includes a first dryer group having a first dryer and a second dryer. The hydrogen purification system includes a conduit system configured to connect the plurality of dryers to a hydrogen gas feed and to a hydrogen gas discharge. The first dryer and the second dryer are arranged in parallel in the adsorption mode allowing parallel flow of the hydrogen gas through the first dryer and the second dryer. The first dryer and the second dryer are arranged in series in the regeneration mode allowing series flow of regeneration gas through the first dryer and the second dryer.