RU2156156C1 - Membrane module for separation of liquid media and method of its manufacture - Google Patents

Abstract

FIELD: mechanical engineering. SUBSTANCE: MEMBRANE module has module made as bellows with external and internal chamber. Membranes and drain elements are shaped as plate. Method of membrane module manufacture includes compression of obtained module, after which at least one inlet collector of mixture to be separated is made in it. EFFECT: enhanced efficiency. 8 cl, 4 dwg

Description

 The invention relates to membrane technology, in particular to devices for carrying out mass transfer processes and / or processes for the separation of liquid media in the medical, pharmaceutical, chemical, biotechnological and other industries, as well as to devices for purifying biological fluids and for carrying out the process of separation of blood during plasmapheresis.

 A membrane dialysis device is known comprising a rectangular housing with collectors for supplying and discharging a shared medium and discharging filtrate and a membrane module made in the form of a block formed by folded membrane folds and separation elements located between the folds. The end edges of the module are sealed by pouring plastic over the entire height of the block. To ensure the flow of the separated mixture between the folds of the membrane material, additional channel-forming elements are installed (French application N 2174821, CL 01 D 13/00, A 61 M 1/00, 1973.).

 The disadvantage of the analogue: the establishment between the folds of the membrane material of additional channel-forming elements leads to an uneven distribution of flows and the formation of stagnant zones, which in turn significantly reduces the performance of the device.

 The closest in technical essence and the achieved result analogue (prototype) is a membrane module for separating liquid media, containing two groups of alternating slit chambers for the separated mixture and filtrate, formed by a set of flat semipermeable membranes, drainage elements and sealing means (RU 2046647, class C1 B 01 D 63/14, publ. 27.10.95).

 The disadvantage of the prototype: the use of sealing means in the form of strips of material containing thermoplastic, located along the direction of movement of the media and permanently connected to the membranes with the formation in the places of contact with them supporting elements in the form of columns, leads to the fact that when the sintering package of blanks under a fixed load the greatest pressure develops precisely in the corners of the workpieces, in the so-called “columns”, where the perpendicular strips of the sealing material intersect, and the lowest pressure (up to pressure of any pressure) is created on the remaining, disjoint sections of the strips of sealing material, which leads to unreliable sealing of the entire membrane module as a whole.

 The disadvantages of this device are the complexity of the manufacture of support elements and the difficulty of using track membranes, the most effective in comparison with other types of membranes, since they are damaged by sealing by mechanical compression.

 In the case of using a known module in the separation of blood - the inability to use the resulting plasma as a donor.

 The closest in technical essence and the achieved result with respect to the claimed method is a method of manufacturing a membrane module for separating media, comprising the step of forming a block of blanks of modules from layers of membranes, drainage elements and sealing means, and after forming the block of blanks is heated to the pour point of the material of the sealing means , maintained under a fixed load, cooled and the unit is divided into separate modules, (patent RU 2046647, CL C1 B 01 D 63/14, publ. 27.10.95 )

 The disadvantages of this method are the complexity of the manufacture of support elements, as well as the difficulty of using track membranes, the most effective in comparison with other types of membranes, since they are damaged by sealing by mechanical compression.

 The objective of the invention is to increase the efficiency of the membrane modules while increasing the manufacturability of the manufacture of membrane modules, providing the possibility of using track membranes as membrane material, increasing the efficiency of separation of the filtrate and reducing damage to the membranes, the possibility of using the membrane module to obtain donor plasma.

The task is achieved by:
- that the membrane module for separating liquid media, containing two groups of alternating slit chambers for the separated mixture and the filtrate formed by a set of flat semipermeable membranes, drainage elements and sealing means, is made in the form of a bellows with external and internal chambers, the semipermeable membranes and drainage elements are made in in the form of plates with at least two peripheral and one central hole, the sealing means is made in the form of frames, chambers of a shared mixture, which are external chambers and bellows, sealed around the perimeter of the central hole with frames of thermoplastic material that fills the thickness of the drainage elements during sintering and glued to the membranes, and the filtrate chambers, which are internal chambers of the bellows, are sealed around the outer perimeter of the drainage elements and the perimeters of the peripheral holes with frames of thermoplastic material filling when sintering, the thickness of the drainage plates and glued to the membranes,
- that the thickness of the drainage plates are the same;
- that track membranes can be used as membranes;
- that the framework can be made of polyolefins, for example polyethylene.

 The problem is also achieved by the fact that in the method of manufacturing a membrane module for separating liquid media, including the operation of forming a block of blanks of modules from layers of membranes, drainage elements and sealing means, after forming a block of blanks under a fixed load, they are heated to the pour point of the material of the sealing means, they are held, cooling and dividing the block into separate modules, the fabricated module is compressed, after which at least one collector ode of the mixture to be separated, the filtrate discharge collector and the concentrate discharge collector, after which the module is finally assembled by sealing its ends with strips of thermoplastic material and attaching the covers to the horizontal planes of the module.

 The fixed load is set with a pressure of 2.0-4.0 kg per module.

 The block of membrane modules under a fixed load can withstand for 1.5-2.5 hours

The block of membrane modules can withstand a fixed load at a temperature of 140-180 ^o C.

 The combination of general and private essential features of the group of inventions ensures the achievement of the desired technical result.

In FIG. 1 shows a proposed module;
in FIG. 2 - section of one of the chambers of the filtrate;
in FIG. 3 - section of one of the chambers of the shared mixture;
in FIG. 4 is a diagram of the alternation of layers of flat semipermeable membranes and drainage elements with sealing means in the form of frames.

 The membrane module for separating liquid media, made in the form of a bellows, contains a cover 1 with a nozzle 2 for supplying a separable mixture, a nozzle 3 for discharge of a concentrate, a nozzle for discharge of a filtrate 4, a collector 5 for supplying a shared mixture, a collector 6 for discharge of a concentrate and a collector 7 for extracting a filtrate (Fig. 1), a cover 8, side covers 9 in the form of strips of thermoplastic material (Fig. 4), chambers 10 of the separable mixture, which are external chambers of the bellows, and chambers 11 of the filtrate, which are internal chambers of the bellows. The chambers 10 and 11 are separated by flat semipermeable membranes 12 (Fig. 4) made in the form of plates made, for example, of a thin film with an average pore diameter of 0.4-0.6 μm. Drainage elements 13 (Fig. 4) are made in the form of mesh plates. The membranes 12 and the drainage elements 13 are made with two peripheral holes 14 and one central hole 15. The chambers 10 of the mixture to be separated are sealed around the perimeter of the central hole 15 with frames 16 of thermoplastic material that fills the thickness of the drainage elements 13 and is bonded to the membranes 12, chambers 11 the filtrate is sealed around the outer perimeter of the drainage elements 13 and the perimeters of the peripheral holes 14 with frames 17 of thermoplastic material that fills the thickness of the drainage elements during sintering 13 and glued to the membranes 12 (Fig. 4). The chambers 10 of the shared mixture communicate with the collectors 5 and 6 of the supply of the shared mixture and the discharge of the concentrate, and the chambers 11 of the filtrate communicate respectively with the collector 7 of the filtrate drain (Fig. 1).

 The separated mixture through the nozzle 2 and the collector 5 for supplying the shared mixture enters the chambers 10 of the shared mixture and flows along the surface of the membranes 12. Since the pressure in the chambers 10 of the shared mixture is higher than in the chambers of the filtrate, a transmembrane pressure is created. In this case, the liquid component of the flow of the separated mixture, including molecules and particles with sizes smaller than the pore diameter in the membrane, penetrates through the membrane 12 into the chamber 11 of the filtrate. Here, the liquid component flows down the drainage elements 13 (Fig. 2) and is discharged through the collector 7 and the filtrate outlet 4 (Fig. 1), and the concentrate is discharged from the chambers 10 of the mixture to be separated through the drainage elements 13 (Fig. 3) through the drain collector 6 concentrate and fitting 3 (Fig. 1).

 The manufacture of the membrane module is as follows.

 Track membranes are obtained by bombarding the dacron film with heavy ions and processing the resulting tracks with an alkali etching solution. Sealing frames 17 made of thermoplastic material are impregnated in the blanks along the outer perimeter of the drainage elements 13 and the perimeter of the peripheral holes 14, and the frames 16 are impregnated around the perimeter of the central hole 15 (Fig. 4). After laying the required number of blanks, a block of blanks is obtained, which is heated under a fixed load to the pour point of the sealing frames 16, 17, held and cooled. The fabricated block of membrane modules is cut into individual modules. A bellows-made separate membrane module is compressed. In the module, a collector 5 for supplying a shared mixture, a collector 6 for concentrate discharge and a collector 7 for extracting the filtrate are carried out, the module is finally assembled by sealing its ends with strips of thermoplastic material and attaching covers 1 and 8 to the horizontal planes of the module (Fig. 1).

 The fixed load is set with a pressure of 2.0-4.0 kg per module.

 The block of membrane modules under a fixed load can withstand for 1.5 to 2.5 hours

The block of membrane modules can withstand a fixed load at a temperature of 140-180 ^o C.

 An example of the method.

 Sealing frames are impregnated flush with the surface into the blanks of drainage elements for chambers of the mixture to be separated and chambers of the filtrate.

 By stacking drainage elements and track membranes one at a time, they form a blank for the block of membrane modules.

The obtained blank of the membrane module block is placed in a special device and compressed with a force of 2.0-4.0 kg per module. The device with the blank block of membrane modules is kept for 1.5 - 2.5 hours at a temperature of 140 - 180 ^o C as a result of which the membranes adhere to the sealing zones. After cooling the block of preforms under load, a block of membrane modules is obtained, which is divided by cutting into separate membrane modules. The manufactured module is compressed and at least one central and two peripheral collectors are made in it, the module is finally assembled by sealing its ends with strips of thermoplastic material serving as side covers of the module, and attaching the covers to the horizontal planes of the module.

Claims (8)

 1. A membrane module for separating liquid media, containing two groups of alternating slit chambers for the mixture to be separated and the filtrate formed by a set of flat semi-permeable membranes, drainage elements and sealing means, characterized in that the module is made in the form of a bellows with external and internal chambers, and the membrane and drainage elements are made in the form of plates with at least two peripheral and one central hole, while the sealing means are made in the form of frames, chambers of a shared mixture, which are They are sealed with external bellows chambers, sealed around the perimeter of the central hole with frames of thermoplastic material, which sinter the thickness of the drainage elements and glued with membranes during sintering, and the filtrate chambers, which are internal bellows chambers, are sealed around the outer perimeter of the drainage elements and the perimeters of the peripheral holes with thermoplastic material, filling during sintering the thickness of the drainage elements and glued to the membranes.  2. The module according to claim 1, characterized in that the thickness of the drainage elements of the chambers of the shared mixture and the filtrate chambers are the same.  3. The module according to claim 2, characterized in that the track membranes are used as membranes.  4. The module according to one of claims 1 to 3, characterized in that the framework is made of polyolefins, for example, polyethylene.  5. A method of manufacturing a membrane module for separating liquid media, including the operation of forming a block of module blanks from layers of membranes, drainage elements and sealing means, and after forming a block of blanks under a fixed load, they are heated to the pour point of the material of the sealing means, they are held, cooled, and the block is separated into individual modules, characterized in that the resulting module is compressed, after which at least one inlet collector yaemoy mixture, the filtrate discharge header and outlet manifold concentrate, whereupon the final assembly of the module by sealing its ends from a thermoplastic material strips and fastening of covers to the horizontal planes of the module.  6. The method according to claim 5, characterized in that the fixed load is set with a pressure of 2.0 to 4.0 kg per module.  7. The method according to PP.5, 6, characterized in that the block of membrane modules under a fixed load can withstand for 1.5 to 2.5 hours 8. The method according to one of claims 5 to 7, characterized in that the unit is maintained under a fixed load at a temperature of 140 - 180 ^o C.

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