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.

The invention relates to a method to produce a particulate activated carbon material for capturing CO.sub.2 from air,

wherein the particulate activated carbon is impregnated with alkali carbonate salt such as K.sub.2CO.sub.3; and wherein the impregnated particulate activated carbon either has, determined using nitrogen adsorption methods, a pore volume of at least 0.10 cm.sup.3/g for pore sizes of at least 5 nm and a pore volume of at most 0.30 cm.sup.3/g for pore sizes of less than 2 nm or is based on a mixture of different alkali carbonate salts, or has a particular pore surface for pore sizes in the range of 2 nm-50 nm.

Provided is a gas adsorption and separation apparatus, comprising an adsorption functional module (01) and a further functional module (02), wherein a main functional portion of the adsorption functional module (01) is an adsorption series (011) composed of two or more adsorption units (09) arranged in sequence; the adsorption series (011) comprises a head end (0111) and a tail end (0112); a gas to be separated passes through the adsorption series (011) in a direction from the head end (0111) to the tail end (0112); when reaching a preset degree of saturation adsorption of the adsorbate gas, the adsorption unit (09) located at the head end (0111) is detached from the adsorption series (011) and enter the further functional module (02) comprising a desorption apparatus (021), and sequentially re-enters the adsorption series (011) from the tail end (0112) after a further process treatment including a desorption treatment is completed; and each adsorption unit (09) is an adsorptive fixed bed which is composed of an adsorbent and a mechanical support structure and has a proper mechanical strength and a good permeability, the adsorption unit (09) which has completed saturated adsorption is referred to as a saturated adsorption unit (091), and the adsorption unit (09) which has completed desorption and regeneration is referred to as a regenerated adsorption unit (092).

Plant and method for the separation of a gas mixture containing a plurality of gaseous components, comprising first and second membrane-based separation stages and a third gas separation stage with adsorption with oscillating pressure, the first, second and third gas separation stages acting in combination to obtain a first final flow of gas enriched in a first component of the initial gas mixture, for example methane, and a second final flow of gas, enriched in a second component of the initial gas mixture, for example carbon dioxide.

A pressure swing adsorption (PSA) system and methods for controlling each PSA cycle performed by the PSA system to produce oxygen enriched gas during productive portions of a user breathing cycle, and to cease production of oxygen enriched gas during non-productive portions of the user breathing cycle, is provided. The PSA system synchronizes PSA cycle phases including adsorption and desorption phases with a user's individual inhalation and exhalation phases, on a breath by breath basis, such that each PSA cycle can be dynamically varied from a succeeding PSA cycle, in real time in response to variations in the user's breathing cycle. An oxygen delivery device including a breathing cycle sensor provides breathing cycle inputs to a controller for use with at least one algorithm to detect breathing flow phases during each user breath, and to synchronize each PSA cycle to the user's breathing flow phases, on a breath-by-breath basis.

In a process for separating carbon dioxide from a waste gas (3) of a fluid bed catalytic cracking installation (1) containing carbon dioxide, nitrogen and possibly carbon monoxide, the waste gas (3) is separated by adsorption to form a gas enriched in carbon dioxide and depleted in nitrogen (29) and a gas rich in nitrogen and depleted in carbon dioxide (31), and at least a portion of the gas enriched in carbon dioxide and depleted in nitrogen is separated in a separation device (30) by way of separation at a temperature of less than 0° C. by partial condensation and/or by distillation to form a fluid rich in carbon dioxide (35) and a fluid depleted in carbon dioxide (37).

Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve performing a startup mode process prior to beginning a normal operation mode process to remove contaminants from a gaseous feed stream. The startup mode process may be utilized for swing adsorption processes, such as TSA and/or PSA, which are utilized to remove one or more contaminants from a gaseous feed stream.

The present disclosure relates to improved solid state sorbent materials and methods for controlling and enhancing carbon dioxide adsorption performance for selected metal-organic framework (MOF) materials. The present disclosure further relates to inventive methods using a novel class of diamine-appended metal-organic frameworks MOF absorbents displaying step-shaped adsorption isotherms with large carbon dioxide capacities. More specifically, the present disclosure relates to diamine-appended MOF materials exhibiting step-shaped adsorption isotherms that are employed in a method utilizing humidity to control and improve carbon dioxide adsorption performance. In addition, the present disclosure relates to diamine-appended MOF materials used in a process including a regeneration step with carbon dioxide and humidity level control to achieve deep carbon dioxide removal even from dilute, near ambient condition carbon dioxide streams as well as more concentrated industrial output streams spanning multiple orders of magnitude. The present disclosure also relates to scrubbing apparatus and methods employing the inventive MOF materials, methods, process steps and apparatus as disclosed to achieve rapid and deeper carbon dioxide capture without the need to pretreat column materials.

Embodiments of the present disclosure describe methods of removing one or more compounds from a fluid comprising contacting a metal-organic framework (MOF) composition having a square-octahedral topology with a fluid containing one or more of CH.sub.4 and O.sub.2, sorbing one or more of CH.sub.4 and O.sub.2 with the MOF composition, and storing one or more of the CH.sub.4 and O.sub.2 with the MOF composition.

The present invention relates to a method and control system to control the speed of centrifugal compressors operating within a vacuum pressure swing adsorption process to avoid an operation at which surge can occur and directly driven by an electric motor that is in turn controlled by a variable frequency drive, while subsequently operating the vacuum pressure swing process between set limits of highest adsorption and lowest desorption pressure. In accordance with present invention an optimal speed for operation of the compressor is determined at which the compressor will operate along a peak efficiency operating line of a compressor map thereof. This speed is adjusted by a feed back speed multiplier when the flow or other parameter referable to flow through the compressor is below a minimum and a feed forward multiplier during evacuation and evacuation with purge steps that multiplies the feed back multiplier to increase speed of the compressor and thereby avoid surge. The speed is then adjusted by a global speed factor which serves to adjust the average speed of the motors over all steps of the repeating cycle such that the process operates within high and low pressure limits.