Importance

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Abstract

The present invention relates to a process for simulated moving bed (SMB) adsorption and separation with a reduced number of control valves, comprising separating the feedstocks comprising isomers by SMB adsorption, said SMB comprising m beds of adsorbent, each of which is equipped with grids, each of the grids being equipped with the materials charging and discharging pipeline of the bed, the materials charged into and discharged from SMB at least comprising adsorption feedstocks, desorbent, extract, raffinate and the flushing liquids charged from different beds, wherein the to extract is enriched with the target product; there are at least two streams of said flushing liquid selected from any one of the adsorption feedstock, desorbent, extract and raffinate; there are altogether n streams of materials charged to and discharged from the SMB, wherein there are s types of materials having the same composition and flow direction; p sets of on-off valves are used to control n streams of materials is charged to and discharged from the beds of adsorbent, wherein at least one group of materials composed of two streams of materials having the composition and flow direction is controlled by one set of valves, with s≦p

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First Claim