mdea absorbent composite and a method for separating acid gas separation

MDEA absorbent composite and the acid gas separation process for the separation of species, belonging to the technical field of gas separation. Composite containing absorbent MDEA MDEA, water immiscible alcohols and water, the mass percentage of 10 to 60% of MDEA, the mass percentage of the water-immiscible alcohol is 10% -60%, of water is 10 mass percent % -80%; as solubilizing effect of MDEA, before a homogeneous acid gas absorption, after absorption of the acid gas formed liquid - liquid two phases, the liquid phase is lean in acid gas load, the liquid phase is an acid gas load rich liquid phase rich liquid only enters the desorption unit, desorption of reducing power consumption. After the composite absorbent of the present invention is formed of an acid gas absorbing liquid - liquid two-phase separated easily, by adjusting the composition ratio of the absorbent to obtain an optimum adaptation to the process on the loading of the volume ratio of the liquid phase and the absorbent , reduce the amount of rich liquid phase into the desorption unit, desorption of reducing power consumption.