SU1680287A1 - Membrane apparatus - Google Patents

Description

The invention relates to membrane separation of solutions by the methods of ultra- and microfiltration and can be used, for example, in the food industry for clarification and concentration of fruit and berry juices. The purpose of the invention is to increase the productivity of the apparatus by reducing the concentration polarization. The apparatus comprises a cylindrical body 1, inside of which is located a hollow rotating shaft 2, which is mounted with circular cylindrical membrane elements 9, made of rigid porous material with an active layer 12 on their outer surface. The membrane elements are deployed on the shaft 2 along a helical line and interconnected to form a helical blade 10. Moreover, the turns of the latter have a variable pitch, and the shaft 2 is made of a rigid porous material and has an active layer on the outer surface 12. 1 sludge.

1680287 A1

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The invention relates to devices for membrane separation of solutions by the methods of ultra- and microfiltration and can be used, for example, in the food industry for clarification and concentration of fruit and berry juices,

The purpose of the invention is to increase the productivity of the apparatus by reducing the concentration polarization.

The drawing shows the apparatus, a longitudinal section.

The apparatus consists of a cylindrical body 1, inside of which is located a hollow rotating shaft 2 having a channel 3 for collecting permeate. At the ends, shaft 2 has pins 4 and 5 fixed to it, one of them damps shaft 2, and the other, made hollow, is intended for removal from the device. In turn, the pins 4 and 5 are installed in end caps, respectively, 6 and 7. Moreover, the latter is sealed with a gland element 8 at the interface with the pivot 5. the formation of a screw blade 10 and at the same time screw channel 11.

The helical blade 10 has a variable pitch between its turns, membrane elements 9. Moreover, both adjacent turns and adjacent groups of turns at the same step size in each group can have a different pitch. Due to this implementation of the helical blade in the process of passing a divided solution into it, there is a sharp increase in its turbulence in the turns of a smaller pitch, due to a significant acceleration of flow in them. ,

Both the shaft of the shaft 2 and the membrane elements 9 are made of a rigid porous material, for example, of a sintered nickel-chromium powder, and are made in the form of a solid, having the form of a screw shaft, an element according to the technology of powder metallurgy. Moreover, its molding can be performed by the method of suspension casting of thin-walled fittings. On the outer surfaces of the shaft shaft 2 and membrane elements 9 there is an active layer 12, which is a semipermeable membrane, made, for example, by the method of plasma spraying of metal, ceramics, and polymer. The supply of the split solution is made

through the pipe 13, the output of the concentrate through the pipe 14.

The device works as follows.

Subject to the membrane separation of the solution through the pipe 13 under pressure enters the working volume of the device. Moreover, with membrane separation by microfiltration, the solution can flow by gravity under the action of the hydrostatic pressure of the solution column in the supply tank (not shown). At the same time, the shaft 2 is driven into rotation. The solution entering the working volume, picked up by membrane elements 9, forcibly, with increasing pressure, moves along the screw channel 11. In the process of this movement, it is intensively mixed by membrane elements 9, which is enhanced by increasing turbulence from accelerating the movement of the solution in sections of the channel 11, having a step of smaller turns.

During the passage of the solution, part of it penetrates through the active layer 12 and further, moving inside the porous material of the element 9 and the shaft 2, enters the channel 3, from which it is removed from the device as a permeate.

The concentrate is discharged through the pipe 14.

The proposed device has high performance, simplicity of design, manufacturability, easily regenerated, which is facilitated by the possibility of creating in the working volume of the device a powerful turbulization mode, a regenerating fluid by rotating the shaft 2 in the opposite direction to the worker. In this case, the screw blade 10 is functionally transformed into a mixing body.

Claims (1)

Claim Diaphragm apparatus Containing a cylindrical body, located inside it is a hollow rotating shaft on which membrane elements are installed, characterized in that, in order to improve the performance of the apparatus by reducing the concentration polarization, the membrane elements are made in the form of a screw with a variable shaft length pitch} koa