DE8907667U1 - Plate membrane - Google Patents

Description

Description

The invention relates to polymer-inorganic composite filters for use in micro- and ultrafiltration and a process for their production.

To date, the following synthetic membrane types made from a wide variety of materials are known:

- Hollow fiber membranes

- Capillary membranes

- Tubular membranes

- Flat membranes

These are used in mechanical membrane separation processes. Except for tubular membranes, these types of membranes are generally characterized by great flexibility.

Amafilter

Membrane technology

GmbH

It is known that handling flexible flat membranes is very difficult, especially when assembling plate modules. The rolling properties of the membranes must be taken into account. The flexible membrane is therefore often glued to the plate.

The present invention solves the problem in a simple way. According to the invention, this is achieved by forming the membrane (2) directly on a porous and rigid plate (1), which at the same time ensures uniform permeate removal. The rigid carrier plate (1) can be a porous sintered metal, sintered glass or sintered ceramic, but also fibrous fabrics and fleeces, in particular made of glass, carbon or metal fibers. With these materials, polymer resins are advantageously used for reinforcement, which can be made porous and rigid using pyrolysis processes.

Further advantages of the rigid plate insert are the good conditions for membrane polymer coatings on both sides. The radial continuation of the permeate in the direction of the larger radii can be ensured due to a uniform and jam-free permeate uptake.

amafilter

Amafiiter

Membrane technology

GmbH

The membrane is formed according to the so-called phase inversion process. For this, a polymer in a known WHiKR should be dissolved in one or more solvents. If necessary, non-solvents or salts can be added.

The resulting homogeneous casting solution is applied evenly to the rigid and porous plate, with the coating thickness ranging from 20 pm to 1000 µm.

The viscosity of the casting solution should be adjusted so that the casting solution only partially penetrates the plate cross-section but does not pass through.

The polymer is applied to the polymer and the solid particles (1) by means of a phase inversion process, so that the plate is guided downwards into the precipitation bath (4) at an angle of between 0 rad and 0.5 π rad to the horizontal in the direction of the position of the plate surface at a fixed distance of between 20 μm and 1000 μm from the stationary polymer application device (3) (Fig. I).

amafilter

ÄmafiBter

Membrane technology

GmbH

In the other case, the polymer layer (2) is applied to both sides of the porous and rigid plate (1) using a phase inversion process, so that the plate is guided downwards into the falling bath at a distance of 0.5 π rad from the horizontal in a vertical position in the direction of the position of the plate surface with a distance of between 20 μm and 1000 μm to the stationary polymer application device (Fig. II).

The plate coated in this way is immersed in a precipitation bath (4). The immersion time can be from 1 min to 120 min. The undesirable rolling up of the membrane during drying is prevented by the plate membrane.

It is possible that the porous and rigid plate is coated on both sides.

In this case, the permeate obtained in the free cross-sectional zone not penetrated by the polymer can be discharged towards the outer edge of the membrane plate.

Claims (2)

Expectations 1. Plate membrane consisting of a polymer membrane layer (2) mechanically inseparably connected to a porous and rigid plate (1), whereby, depending on the selection, the thickness of the plate (1) is between 50 µm and 5000 µm, the pore size of the rigid plate (1) is between 5 µm and 500 µm, the porosity of the rigid plate (1) is between 0.1 and 0.9 and the thickness of the connected polymer membrane layer (2) is between 20 µm and 100 µm, characterized in that the openings of the rigid and porous plate (1) are connected to one another in the direction of the larger radii. amafitter Aif|fif|iterJ.::4 Membrane Technology GmbH amafilter 2. Plate membrane according to claim 1, consisting of two polymer membrane layers (2) with a porous and rigid plate (1) mechanically insoluble connected, whereby depending on the selection the thickness of the plate (1) between 50 um and 5000 um, the pore size of the rigid Plate (1) between 5 um and 500 pm, the porosity of the '& rigid plate (1) between 0.1 and 0.9 and the thickness £ the bonded polymer membrane layer (2) between 20 um and 1000 pm, characterized in that the '; Openings of the porous and rigid plate (1) in direction !') of the larger radii are connected. ^