In order to limit exposure of a fan (50) and of eventually other internal components to oxidizing species induced by the operation of an ozone generator (70), a gas treatment system (10) of the type operating alternately in treatment mode and in regeneration mode comprises two adsorption devices (60, 80) which are arranged respectively upstream and downstream of the ozone generator.

The current disclosure provides systems and methods for multiple beds undergoing a feed step at the same time with the same feed flow rate and multiple beds undergoing a light reflux step at the same time with the same light reflux flow rate to process a gas stream in a multi-bed, multi-unit vacuum swing adsorption (VSA) process using reasonably sized beds.

The present invention is directed to a dryer provided with an inlet for receiving a flow of compressed gas and an outlet for providing dry air, said dryer comprising: a first and a second adsorption vessel connected in parallel, a depressurization unit connectable to the inlet flow conduit of each of said first and second adsorption vessels; whereby the dryer further comprises a flow reducer connectable to the inlet flow conduit of each of the first and second adsorption vessels and whereby said control valves are adapted to be switched in a first state, and a second state.

A system and method for processing unconditioned syngas first removes solids and semi-volatile organic compounds (SVOC), then removes volatile organic compounds (VOC), and then removes at least one sulfur containing compound from the syngas. Additional processing may be performed depending on such factors as the source of syngas being processed, the products, byproducts and intermediate products desired to be formed, captured or recycled and environmental considerations.

The present invention provides a process for capturing CO.sub.2 from a gas stream, the process at least comprising the steps of: (a) providing a CO.sub.2-containing gas stream; (b) contacting the gas stream as provided in step (a) in an adsorption zone with solid adsorbent particles thereby obtaining CO.sub.2-enriched solid adsorbent particles (c) passing CO.sub.2-enriched solid adsorbent particles as obtained in step (b) from the bottom of the adsorption zone to the bottom of a first desorption zone; (d) removing a part of the CO.sub.2 from the CO.sub.2-enriched solid adsorbent particles in the first desorption zone, thereby obtaining partly CO.sub.2-depleted solid adsorbent particles and a first CO.sub.2-enriched gas stream; (e) passing the partly CO.sub.2-depleted solid adsorbent particles as obtained in step (d) via a riser to a second desorption zone; (f) removing a further part of the CO.sub.2 from the partly CO.sub.2-depleted solid adsorbent particles in the second desorption zone thereby obtaining regenerated solid adsorbent particles and a second CO.sub.2-enriched gas stream; and (g) recycling regenerated solid adsorbent particles as obtained in step (f) to the adsorption zone of step (b); wherein the second desorption zone is located above the adsorption zone.

A portable oxygen concentrator designed for medical use where the adsorbent beds, are designed to be replaced by a patient. The concentrator is designed so that the power supply and adsorbent bed mount is one module and the compressor and air filter are part of another module configured to provide a unitary cooling and air supply system. Replacement beds may be installed easily by patients, and all gas seals will function properly after installation.

A natural gas adsorptive separation system and method is described. A method of separating natural gas includes directing a natural gas mixture through an activated carbon adsorption tower until the adsorption tower is saturated, collecting methane from the output of the adsorption tower, heating the saturated carbon adsorption tower with adsorbate using a heater and/or a vacuum pump in a closed loop circuit with the carbon adsorption tower until the input to the vacuum pump is within a specified temperature of the output of the heater, lowering the pressure in the heated activated carbon adsorption tower using the vacuum pump to desorb at least one hydrocarbon compound of the plurality of different hydrocarbon compounds, compressing and cooling the desorbed hydrocarbon compound, separating the cooled and compressed hydrocarbon compound into gas and liquid in a fluid separator, and collecting the liquid from the fluid separator.

A vacuum assisted pressure swing adsorption device for purifying oxygen from air, comprising: a first adsorption bed of LiLSX adsorbent and second adsorption bed of AgLiLSX adsorbent, wherein the first adsorption bed and the second adsorption bed are connected to each other in series. A method for producing medical oxygen using a vacuum assisted pressure swing adsorption device comprising: a first adsorption bed of LiLSX adsorbent and second adsorption bed of AgLiLSX adsorbent, wherein the first adsorption bed and the second adsorption bed are connected to each other in series.

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 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.