Dual layer hollow fiber sorbents for trace H2S removal from gas streams

Hollow fiber sorbents are pseudo monolithic materials with potential use in various adsorption based applications. Dual layer hollow fiber sorbents have the potential to allow thermal regeneration without direct contact of the regeneration fluid with the sorbent particles. This paper considers the application of dual layer hollow fiber sorbents for a case involving trace amounts of H2S removal from a simulated gas stream and offers a comparison with single layer hollow fiber sorbents. The effect of spin dope composition and core layer zeolite loading on the gas flux, H2S transient sorption capacity and pore structure are also studied. This work can be used as a guide to develop and optimize dual layer hollow fiber sorbent properties beyond the specific example considered here.

► Hollow fiber sorbents show high H2S sorption capacity.
► Fibers indicate macroscopic pores due to both polymer and suspended zeolites.
► Higher zeolite loading fibers spun at lower dope temperature show higher porosity.
► Polyvinylidene chloride (PVDC) barrier sheath layer found to give low gas permeance.