English to Dutch Tech/Engineering Engineering: Industrial industriële en medische gassen

Het gaat me om de betekenis van bed in de volgende tekst:

By simulations using an equilibrium model, a quantative comparison is made for different pressure swing adsorption (PSA) processes for gas separation. The comparison is based on the performance curve, which is defined as the relationship between product purity and product recovery at a fixed feed throughput.

For bed repressurization in the PSA cycle, the use of the light product yields superior separations compared to that using the feed mixture.