Resaturation of gas into a liquid feedstream

A trickle bed process vessel for treatment of a reactant-lean, product-rich liquid stream, comprising:

• an exchange layer comprising a plurality of collector media and a plurality of releaser media, wherein the exchange layer is capable of facilitating diffusion of one or more reactants from a gas phase into a reactant-lean, product-rich liquid phase within the exchange layer to form a reactant-rich, product-lean liquid phase;
• and
• a treatment layer downstream of the exchange layer comprising a bed of porous solid elements, the porous solid elements comprising at least one of catalysts, sorbents and reactants and capable of performing a treating process to remove an undesired species from the liquid phase,
• wherein the collector media comprise porous solid materials capable of collecting the reactant-lean liquid phase within the collector media, and wherein the releaser media comprise solid materials having a thin film formed on an outer surface thereof that is capable of facilitating contact and diffusion between the reactant-lean, product-rich liquid phase and the gas phase, and wherein the thin film is formed on the releaser media during processing as a result of liquid released from the collected liquid phase, and wherein the size of the releaser media is no more than one-fourth the size of the collector media.