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A hollow fiber membrane-type fluid separation apparatus useful for selective separation of fluids in various techniques such as gas permeation, liquid permeation, dialysis, ultrafiltration, reverse osmosis, etc., which comprises at least one pair of unit structures which are arranged uniaxially in s

A hollow fiber membrane-type fluid separation apparatus useful for selective separation of fluids in various techniques such as gas permeation, liquid permeation, dialysis, ultrafiltration, reverse osmosis, etc., which comprises at least one pair of unit structures which are arranged uniaxially in series within a cylindrical pressure vessel, said pair of unit structures comprising a pair of cylindrical hollow fiber assemblies having a selective permeability, a means for collecting permeated fluid, which is held between side tube sheets provided each at a terminal of the pair of cylindrical hollow fiber assemblies and is capable of collecting the fluid which passes through the side tube sheet, a permeation fluid pipe for taking out the permeated fluid, which penetrates perpendicularly the means for collecting a permeated fluid at the center, and a fitting means provided with a passageway for passing a concentrated fluid being not permeated, said passageway being arranged at around central region of the means for collecting a permeated fluid so as to surround the permeation fluid pipe.

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1. A fluid separation apparatus which comprises at least one pair of unit structures which are arranged uniaxially in series within a cylindrical pressure vessel, each pair of unit structures comprising: a pair of cylindrical hollow fiber assemblies having a selective permeability; a pair of cor

1. A fluid separation apparatus which comprises at least one pair of unit structures which are arranged uniaxially in series within a cylindrical pressure vessel, each pair of unit structures comprising: a pair of cylindrical hollow fiber assemblies having a selective permeability; a pair of cores, each arranged internal to and concentric with a respective one of the cylindrical hollow fiber assemblies; a pair of permeating fluid pipes, each arranged internal to and concentric with a respective one of the cores; collecting means connected to one end of each pair of cylindrical hollow fiber assemblies for collecting permeated fluid from the cylindrical hollow fiber assemblies, said collecting means being connected to adjacent ends of their respective cylindrical hollow fiber assemblies; and fitting means connected to said collecting means and to corresponding ends of each core and permeating fluid pipe, said fitting means being adapted so that the collected permeated fluid passes to the permeating fluid pipes for passage there-through and the remaining fluid passes between the cores. 2. An apparatus according to claim 1, wherein the means for collecting a permeated fluid and the fitting means are made integrally. 3. An apparatus according to claim 1, wherein the means for collecting a permeated fluid has concentrically cyclic channels and radial channels on the surface thereof, through which the permeated fluid passes and flows into a passageway of the fitting means. 4. An apparatus according to claim 1, wherein the fitting means has a central bore which is provided at the central region of the fitting means and is connected to the permeation fluid pipes, a passageway for passing the concentrated fluid which is provided in the axial direction in parallel and adjacent to the central bore, and a passageway for passing the permeated fluid at the central region which penetrates the fitting means perpendicularly to the axial direction and is led to the central bore. 5. An apparatus according to claim 1, wherein two or more pairs of unit structures are contained in series in a cylindrical pressure vessel and these unit structures are connected with a connecting pipe. 6. An apparatus according to claim 1, wherein an additional hollow fiber assembly is arranged in addition to one or more pairs of unit structures in series. 7. An apparatus according to claim 1, wherein the cylindrical pressure vessel has an inner diameter of 20 to 700 mm and a length of 200 to 7,000 mm. 8. An apparatus according to claim 1, wherein the hollow fibers have an outer diameter of 10 to 1,000 μm and a hollow ratio of 3 to 80%. 9. An apparatus according to claim 1, wherein the hollow fiber assemblies have an outer peripheral ring and an inner peripheral ring at a tube sheet and an end-block ring in an end-block.