Abstract: A method for regenerating a spent alkanolamine absorbing solution containing absorbed H.sub.2 S and CO.sub.2 in two desorption stages to produce two separate acid gas streams. The first acid gas stream that contains substantially all of the H.sub.2 S is sent to a sulfur recovery system and the second acid gas stream that is primarily CO.sub.2 is vented to the atmosphere. The desorption stages are connected in series and both are operated at substantially the same above-atmospheric pressure within the range of 8-12 psig (1.54-1.82 atm abs).

Abstract: A method and apparatus for selectively removing a desired gaseous component from a gas stream containing at least two gaseous components and having a variable flow rate. The absorber is divided into at least two individual absorption volumes connected in series in which the gas and absorbent solution can countercurrently contact each other and includes means to control the passage of the fluid streams through the individual absorption volumes.

Abstract: A method and apparatus for selectively removing H.sub.2 S from a gas stream containing H.sub.2 S and CO.sub.2 and having a variable flow rate. The absorption system is divided into at least two absorption columns which are connected in parallel and contain at least two individual absorption volumes connected in series in which the gas and absorbent solution can countercurrently contact each other. The absorption system has means to control the passage of the fluid streams to each absorption column and the absorbent solution through the individual absorption volumes.

Abstract: A method and apparatus for selectively removing H.sub.2 S from an H.sub.2 S and CO.sub.2 containing gas stream which has a variable flow rate. The absorption apparatus is divided into two connected individual absorption volumes in which the gas and absorbent solution can countercurrently contact each other and has means to control the passage of the fluid streams through the individual absorption volumes.