| 摘要 |
Absorption plant, comprising multiple beds (32) connected in series in a closed circuit, has each volume (34) between adjacent beds connected via a respective manifold (35) to on-off valves (36a,37a,38a,39a) which control the supply of a fluid charge to be separated and solvent to desorb the beds and the removal of two extracts rich and poor in respective constituents of the charge. The valves are switched by common controller (50) so that fluids are supplied and removed at different and sequentially changing inter-bed volumes around the circuit. The manifolds also have respective valves (41a), which are controlled in step with valves (36a-39a) and connected to a common circuit for draining a controlled volume of residual fluid from each manifold (35) before certain switch-overs and recycling it to another manifold (34). Also claimed is separating the constituents of a charge using the plant, wherein valves (41a) drain and recycle a volume corresponding to the manifold and the pipe connecting it to volume (34).
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