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 desiccant replacing apparatus may include a supply-discharge member, a supply connection line connected to the supply-discharge member, an air conveyor coupled to the supply connection line, a discharge connection line connected to the supply-discharge member, and an air amplifier coupled to the discharge connection line. The supply-discharge member may include a housing providing an internal space, an injection line providing an injection path and penetrating the housing, an exhaust line providing an exhaust path connected to the internal space, and a filter in the internal space or the exhaust path. The supply connection line may be connected to the injection line, and the discharge connection line may be connected to the exhaust line.

The process of the present invention provides high recovery and low capital cost giving it an economic advantage over previously known purification processes. The present process has particular applicability to the purification of synthesis gases comprising at least hydrogen (H.sub.2), carbon monoxide (CO), methane (CH.sub.4), CO.sub.2, and H.sub.2O to obtain a gas stream including at least H.sub.2, CO, and CH.sub.4, that is substantially free of H.sub.2O and CO.sub.2. The process also has applicability to the purification of natural gases inclusive of at least CH.sub.4, N.sub.2, CO.sub.2, and H.sub.2O to produce a gas stream including at least CH.sub.4 and N.sub.2, but which is substantially free of H.sub.2O and CO.sub.2.

A scrubbing solution for removing contaminants, including particularly hydrogen sulfide, from a fluid. The scrubbing solution includes at least one scrubbing reagent which has a primary or secondary amine and an acid, which may be phosphoric acid. The fluid being scrubbed is passed through the scrubbing solution. The contaminants react with the scrubbing reagent securing them in the scrubbing solution. The fluid being scrubbed and the scrubbing solution are then separated. The scrubbing solution is heated and, if the scrubbing solution is under pressure, the pressure is reduced. The acid facilitates thorough removal of the contaminants, and especially the hydrogen sulfide, from the scrubbing solution. The scrubbing solution is then ready for reuse. Because the scrubbing solution is rendered substantially free of hydrogen sulfides, it can absorb other sulfide contaminants that might not otherwise be absorbed.

The present invention describes a process to separate ethylene products from impurities such as nitrogen, hydrogen, ethane, propane and isobutane without the need for distillation processes.

Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve performing modeling to generate a swing adsorption system to manage a feed stream to produce a product stream within specification. The 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.

A scrubbing solution for removing contaminants, including particularly hydrogen sulfide, from a fluid. The scrubbing solution includes at least one scrubbing reagent which has a primary or secondary amine and an acid, which may be phosphoric acid. The fluid being scrubbed is passed through the scrubbing solution. The contaminants react with the scrubbing reagent securing them in the scrubbing solution. The fluid being scrubbed and the scrubbing solution are then separated. The scrubbing solution is heated and, if the scrubbing solution is under pressure, the pressure is reduced. The acid facilitates thorough removal of the contaminants, and especially the hydrogen sulfide, from the scrubbing solution. The scrubbing solution is then ready for reuse. Because the scrubbing solution is rendered substantially free of hydrogen sulfides, it can absorb other sulfide contaminants that might not otherwise be absorbed.

The embodiments of the present disclosure provide a portable oxygen concentrator. The portable oxygen concentrator may comprise an input configured to receive air flow, a column comprising a housing, an outer porous tube, an inner porous tube, and an inner cavity, and an output configured to release oxygen to a user. The inner porous tube comprises an adsorbent bed comprising a plurality of zeolites, and the column is configured to channel air radially through and across the outer porous tube, through and across the adsorbent bed in the inner porous tube, into the inner cavity of the column, and through the output. When the air flow contacts the adsorbent bed, oxygen is released.

An adsorption process is provided to remove oxygen from a hydrogen stream through the use of a copper material in combination with layers of adsorbent to remove water and nitrogen from a hydrogen stream. This process is particularly useful for purification of hydrogen product gas from water electrolyzers with the hydrogen product gas having greater than 99.9 mol % purity.