помогите, пожалуйста, перевести понятие lean loadings в следующем контексте:

a) CO2 reaction kinetics and number of theoretical stages:
With respect to kinetics, shorter absorber columns reduce the overall mass transfer area and overall retention time, so CO2 absorption is reduced to a certain extent. However if the absorber height is too short, H2S may not be absorbed sufficiently. In today's selective designs, very tight H2S specifications (in the very low ppm-range) are required. This means a design with a large safety margin is highly advisable. As a consequence, process designers apply multiple amine feed points to the absorber in order to adjust the mass transfer area. In some cases, even flexible weir heights are designed as a sophisticated solution. As subject of this paper, an even higher degree in selectivity through reduction in tower height could be achieved by reducing the LEAN LOADINGS and by increasing the driving force for the equilibrium at the absorber overhead.

Документ про селекивное удаление H2S, один из процессов фирмы BASF..

Заранее большое спасибо!