Method simulating moving bed to separate three-component compound

A method simulating a moving bed to separate three-component compound comprises the steps of (a) providing a three-area simulating moving bed device which comprises an alpha area, a beta area and a gamma area which are sequentially communicated and respectively provided with a first flow speed ratio, a second flow speed ratio and a third flow speed ratio; (b) providing the three-component compound containing three components of a strong absorption component, a middle absorption component and a weak absorption component which respectively have a henry absorption constant Ka, Kb and Kc on an absorption agent; (c1) inputting the three-component compound into the three-area simulating moving bed so that the first flow speed ratio is larger than Ka, the second flow speed ratio and the third flow speed ratio are smaller than Kb and larger than Kc, and the weak absorption component of the three-component compound is separated; and (c2) when the first flow speed ratio is larger than Kb and smaller than Kc, and the se