A plant for acid gas absorption and solvent regeneration comprising: (a) an absorber for the production of a rich solvent from an untreated sour feed gas, the absorber comprising an upper section with an inlet for a ultra-lean solvent (24, 27), and a lower section with an inlet for a first portion (21, 4) of a lean solvent; (b) a flow control element fluidly coupled to said lower section of the absorber, configured to split the rich solvent into a reflux portion and a second portion of the rich solvent; (c) a lean/rich heat exchanger, being configured to heat the second portion of the rich solvent to generate a heated second portion of the rich solvent; (d) a primary regenerator having a upper section and a lower section, wherein the upper section comprises - a first inlet for the reflux portion, and - a second inlet for the heated second portion of the rich solvent; and wherein the lower section is configured to produce a lean solvent from both the reflux portion and the heated second portion of the rich solvent; (e) means for splitting the lean solvent into the first portion of the lean solvent and a second portion of the lean solvent; (f) a secondary regenerator having an inlet for the second portion of the lean solvent and configured to produce the ultra-lean solvent therefrom; wherein the lean/rich heat exchanger is configured for cooling the first portion of the lean solvent and the ultra-lean solvent, the upper portion of the secondary regenerator is in fluid communication with the primary regenerator for feeding steam-containing overhead product of the secondary regenerator as stripping steam into the primary regenerator, and a heat exchanger is operationally coupled to the absorber and is configured to heat the untreated sour feed gas prior to entry into the absorber to thereby cool the reflux portion. (a) an absorber for the production of a rich solvent from an untreated sour feed gas, the absorber comprising an upper section with an inlet for a ultra-lean solvent (24, 27), and a lower section with an inlet for a first portion (21, 4) of a lean solvent; (b) a flow control element fluidly coupled to said lower section of the absorber, configured to split the rich solvent into a reflux portion and a second portion of the rich solvent; (c) a lean/rich heat exchanger, being configured to heat the second portion of the rich solvent to generate a heated second portion of the rich solvent; (d) a primary regenerator having a upper section and a lower section, wherein the upper section comprises - a first inlet for the reflux portion, and - a second inlet for the heated second portion of the rich solvent; and wherein the lower section is configured to produce a lean solvent from both the reflux portion and the heated second portion of the rich solvent; - a first inlet for the reflux portion, and - a second inlet for the heated second portion of the rich solvent; (e) means for splitting the lean solvent into the first portion of the lean solvent and a second portion of the lean solvent; (f) a secondary regenerator having an inlet for the second portion of the lean solvent and configured to produce the ultra-lean solvent therefrom; wherein the lean/rich heat exchanger is configured for cooling the first portion of the lean solvent and the ultra-lean solvent, the upper portion of the secondary regenerator is in fluid communication with the primary regenerator for feeding steam-containing overhead product of the secondary regenerator as stripping steam into the primary regenerator, and a heat exchanger is operationally coupled to the absorber and is configured to heat the untreated sour feed gas prior to entry into the absorber to thereby cool the reflux portion. the lean/rich heat exchanger is configured for cooling the first portion of the lean solvent and the ultra-lean solvent, the upper portion of the secondary regenerator is in fluid communication with the primary regenerator for feeding steam-containing overhead product of the secondary regenerator as stripping steam into the primary regenerator, and a heat exchanger is operationally coupled to the absorber and is configured to heat the untreated sour feed gas prior to entry into the absorber to thereby cool the reflux portion.