Formulation and application of encapsulated chemical sorbents

Wellio, Gilmore (2021). Formulation and application of encapsulated chemical sorbents. University of Birmingham. Ph.D.

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Abstract

Encapsulated sorbents are emerging as a new tier of composite sorbent materials that furnishes liquid sorbents with the properties of solid sorbents. The favourable properties of selectivity and high loading capacity of liquid sorbents are further enhanced by the discretization into smaller encapsulated units of higher surface area which also reduce solvent loss and retain precipitates and by-products. Recently, encapsulated sorbents have been demonstrated in applications for the removal of CO2 from effluent gases using advanced solvents with the potential of increasing the energy efficiency of the process with respect to established technologies.
Sorption thermochemical energy storage systems could equally benefit from encapsulation where liquid sorbents consisting of aqueous solutions of hygroscopic salts are prone to crystallization and corrosion issues. It is immediately clear that for such composite materials, shell material development should be geared towards selectively permeable shell materials able to retain the hygroscopic salts whilst allowing exchange of the solvent (water) with the environment. Additionally, such shell materials must have sufficient mechanical strength to withstand rupture as well as thin walls to minimise mass transfer resistances. Moreover, the impact of the deformability of the encapsulated sorbents under external loads, such as in packed beds, on the sorption performance requires greater investigation.

Type of Work:

Thesis (Doctorates > Ph.D.)

Award Type:

Doctorates > Ph.D.

Supervisor(s):