(1) Foaming in alkanolamine desulfurizing solution in the CO2/H2S absorption column is often observed in the natural gas treating plant in Changqing oil fields.

(2) Suggestions on the improvements of the aqueous alkanolamine solution process for removing of hydrogen sulfide and carbon dioxide simultaneously are also presented.

(3) Alkanolamine solution foaming has been described as the one of the main operational problems encountered in natural gas processing plants.

(4) The research on the amino acid by dehydrogenation alkanolamine(s) in catalyst was recommended.

(5) And more attention should be paid to the integration of the aqueous alkanolamine solution process and the membrane separation process for natural gas purification.

(6) The scope of application of these water solutions of alkanolamine almost covers all treating regions of sour gas.

(7) The EOS can satisfactorily predict vapor liquid equilibria and densities of ternary alkanolamine systems using these binary interaction adjustable parameters.