Membranes Pressure swing adsorption

Esteves lAAC, Mota JPB (2002) Simulation of a new hybrid membrane/pressure swing adsorption process for gas separation. Desalination 148 275-280... 

Novel Hybrid Membrane Pressure Swing Adsorption Processes 249... 

Competing Processes Membranes are not the only way to make these separations, neither are they generally the dominant way. In many apphcations, membranes compete with ciyogenic distillation and with pressure-swing adsorption in others, physical absorption is the dominant method. The growth rate for membrane capacity is higher than that for any competitor. 

Solution Let yPSA represent the selection of pressure swing adsorption, yMs the selection of the membrane separator and yCc the selection of cryogenic condensation. First restrict the choice between pressure swing adsorption and cryogenic condensation. 

These two equations restrict the choices, but still allow the pressure swing adsorption and membrane separator to be chosen together. 

Besides absorption processes, adsorption processes, cryogenic separation or membrane separation can be applied. Adsorption processes are based on the physical attachment and bonding of components from the gas mixture on the surface of solid sorbents. As with absorption a distinction can be made between physical and chemical adsorption the first one is referred to as pressure-swing adsorption (PSA), where... 

A number of system approaches can be used to clean up the fuel feed. These include pressure swing adsorption, membrane separation, methanation, and selective oxidation. Although selective oxidation does not remove CO2, it is usually the preferred method for CO removal because of the parasitic system loads and energy required by the other methods. In selective... 

Additional processes for the separation of pure nitrogen involve the use of cryogenics (Fig. 2), membranes (Fig. 3), or pressure-swing adsorption systems (Fig. 4). The use of any one of these processes either as a single adjunct or as a multiadjunct to the nitrogen process is known. 

Alternatives to the cryogenic separation process include the membrane separation process and adsorption processes. The adsorption processes include pressure swing adsorption (PSA)10 and vacuum swing adsorption (VSA). These methods are noncryogenic and produce a vapor product only. This reduces the cost of production considerably when the local use of gas-phase product is the primary objective. 

These conclusions can only be tentative with the limited data here. However the potential scope for future studies of the kinetics of adsorption and partitioning of mixed sorbates is evident. This is of particular interest with microporous sorbents, such as carbons, especially where molecular size effects may be predominant. Such an aspect is indeed particularly relevant in gas separation processes which may involve membranes and pressure swing adsorption. 

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