Liquid purification or separation – Processes – Separating
Patent
1989-03-02
1990-09-11
Spitzer, Robert
Liquid purification or separation
Processes
Separating
210798, 210402, 210411, 2105101, B01D 33067, B01D 3348
Patent
active
049561022
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method in rotating filters of the kind which include a substantially cylindrical filter which has a permeable tube wall and which is journalled sealingly at preferably two axially spaced locations, preferably at the ends of the tube, for rotation about its longitudinal axis in a filter jacket, in which method material to be filtered, the feed, is fed to a space between the filter jacket and the filter tube, and in which the filtered material, hereinafter called the filtrate, can be removed from the interior of the filter tube.
The invention also relates primarily to a so-called rotating filter for carrying out the method.
Methods and filters of essentially the aforementioned kind are known to the art. The prior art techniques, however, are encumbered with such drawbacks as high costs, relatively limited capacities with regard, e.g.,to the dry solids contents that can be achieved therewith, and the relatively small possibility of maintaining flexibility with regard to conditions of use and maintenance and the fulfillment of high sterile requirements.
The present invention provides a method and filter which are not encumbered with such drawbacks. Thus, the cost of each unit of filtrate is low. Moreover, the invention enables beneficially high rotational speeds to be used. Flexibility with regard to use is also high. The method and filter according to the invention are particularly suited for use in biotechnical applications where demands on sterility are high. The word sterilization is used here as a common designation for processes which are intended to reduce or eliminate the risk of spreading infection. It will be understood that the invention also pertains to such processes as pasteurization and the like. The rotational motion is utilized, inter alia, to increase capacity and to improve journal and sealing functions.
Thus, the invention relates to a method for application in conjunction with primarily so-called rotating filters of the kind in which the filter includes a substantially cylindrical filter tube which has a permeable tube wall and which is sealingly journalled at preferably two mutually spaced axial locations, preferably at the tube ends, for rotation about its longitudinal axis in a filter jacket; in which material to be filtered, the feed, is fed to a space between the filter jacket and the filter tube; and in which filtered material, the filtrate, can be tapped from the interior of the filter tube.
The method is particularly characterized by sealing and journalling the filter tube in a manner adapted to substantial temperature changes of the filter tube and in a sterilizible or like manner; by sterilizing and lubricating and cooling bearings and seals when applicable with the aid of sterilizing media; and by rotating the filter tube, when applicable, preferably at a relatively high speed.
The invention also relates to a filter of primarily the socalled rotating kind which includes a substantially cylindrical filter tube which has a permeable tube wall and which is journalled at preferably two axially spaced locations, preferably at the ends of the tube, for rotation about its longitudinal axis in a filter jacket; and with which filter material to be filtered, so-called feed, is intended to be fed to a space between the filter jacket and the filter tube, and the filtered material, the filtrate, is intended to be tapped from the interior of the filter tube.
The filter is particularly characterized in that seals and bearings are arranged to take-up axial displacement movements and forces caused and created by substantial temperature changes in the filter tube; in that means are provided for sterilizing or similarly treating the filter tube; in that means are provided for sterilizing and for lubricating and cooling bearings and seals when applicable; and in that the filter tube is arranged for rotation at relatively high speeds.
The invention will now be described in more detail with reference to exemplifying embodiments thereof and to the accompanying drawin
REFERENCES:
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patent: 2655265 (1953-10-01), Little
patent: 2673748 (1954-03-01), Shaw
patent: 2725145 (1955-11-01), Mylius
patent: 2765085 (1956-10-01), Strindlund
patent: 3029948 (1962-04-01), McKay
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patent: 3419144 (1968-12-01), Huntington
patent: 3567030 (1971-03-01), Loeffler
patent: 3797663 (1974-03-01), Bourdale 210402
Publication, Driftsinstruktion MAB; OM 592100 S 2/8010, Alfa-Laval AB, Sweden (1980), p. 9.
Publication, Driftsinstruktion FEUX; OM SO 4605 S 1/8204, Alfa-Laval AB, Sweden (1982), p. 1.3.
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