Liquid purification or separation – Plural distinct separators – Filters
Patent
1986-04-18
1987-11-03
Sadowski, David
Liquid purification or separation
Plural distinct separators
Filters
21032179, B01D 1300
Patent
active
047042052
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a semipermeable module used as an apparatus for the separation, purification and concentration of a solution in a technical field of water treatment on the basis of a reverse osmosis method or a ultrafiltration method etc. which is used for the recovery of electrodeposition paints, concentration of fruit juice, purification of enzyme liquid, sewage treatment and desalination of salt water etc. Particularly, the present invention relates to the inner constructions of an end head of a cluster tubular membrane module.
BACKGROUND ART
A typical example of the conventional tubular membrane module has a plurality of porous support tubes each containing a semipermeable membrane which are arranged parallel in a plurality of stages, and which are received in a cylindrical casing and are provided at both ends thereof with heads containing return bends so as to connect the porous support tubes into zigzags, and the heads and the porous support tubes are fixed together by fastening them by means of a stay bolt passing through the heads.
However, in this type of the conventional tubular membrane module, in order to receive a multiplicity of the porous support tubes each containing a semipermeable membrane into the cylindrical casing as many as possible effectively, such following problems were caused depending on the number of the porous support tubes or the number of the stay bolts received in the casing of the same capacity.
Namely, a typical example of the conventional tubular membrane module has, as shown in FIG. 1 or 2, a multiplicity of porous support tubes 1 each containing a semipermeable membrane 2 (all of the tubes contain semipermeable membranes but FIG. 1 shows only one porous support tube containing the semipermeable membrane in view of simplification of FIG. 1) which are arranged parallel in a plurality of stages into a casing 3, and which are fixed at both ends thereof with heads containing return bends so as to connect the porous support tubes, and the heads and the porous support tubes are tightly fastened together by means of one or two stay bolt(s) 5.
In this constitution, the porous support tubes 1 are arranged symmetrically and the number of the stay bolt is selected to be one (FIG. 1) or two (FIG. 2).
In case of using a single stay bolt disposed at the center of the casing as shown in FIG. 1, the same number of the porous support tubes (two in this case) are disposed at both sides of the stay bolt in any radial directions, so that as a whole an even number of the porous support tubes (eighteen in this case) are disposed in the casing and further an inlet A and an outlet B are disposed at the same head side, thereby simplifying the arrangement and maintenance of the support tubes. However, since the stay bolt 5 passes through both the heads, the porous support tubes 1-a and 1-b at both sides of the stay bolt 5 can not be directly connected through a return head contained in the head. Thus, in order to connect the porous support tubes 1-a and 1-b, such a fluid path of a tube (1-a).fwdarw.a tube (1-c).fwdarw.a tube (1-d).fwdarw.a tube (1-e) a tube (1-b) is formed so as to go around the stay bolt as shown in FIG. 1. In this fluid path, in case of removing the solution remained in the tubes from the inlet A after completion of the treatment of the solution, a solution stagnant portion U can be disadvantageously formed between the tubes 1-c and 1-e because there is a solution rising path from the tube 1-c to the tube 1-a.
As a direct influence due to the presence of the solution stagnant portion U, the solution therein is likely to be rotten. Further, as an indirect influence due to the presence thereof, when the operation of the separation apparatus is stopped, the solution in the solution stagnant portion is transmitted out of the tube through the tubular membrane to reduce the volume of the solution in the solution stagnant portion to reduce the inner pressure within the tubular membrane, thereby exfoliating the membrane from the inner surface of th
REFERENCES:
patent: 3821108 (1974-06-01), Manjikian
patent: 4326960 (1982-04-01), Iwahori et al.
Daicel Chemical Industries Ltd.
Sadowski David
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