Currently, the following high-flux zeolite MFI and CHA membranes are available:


1. Ultra-thin (< 500 nm) Zeolite MFI membrane discs supported on circular graded α-alumina supports with a diameter of 25 mm. The support consists of a 30 µm thick top layer with a pore size of 100 nm and a 3 mm thick base layer with a pore size of 3 µm. The active membrane area when mounted in a steel cell (see below) is 2.8 cm2.

2. Ultra-thin (< 1000 nm) Zeolite CHA membrane discs supported on circular graded α-alumina supports with a diameter of 25 mm. The support consists of a 30 µm thick top layer with a pore size of 100 nm and a 3 mm thick base layer with a pore size of 3 µm. The active membrane area when mounted in a steel cell (see below) is 2.8 cm2.

3. Ultra-thin (< 500 nm) Zeolite MFI Membrane tubes supported inside graded α-alumina supports with a length of 100 mm. The support has an inner diameter of 7 mm and an outer diameter of 10 mm and consists of a 30 µm inner layer with a pore size of 100 nm and a 1.5 mm thick base layer with a pore size of 3 µm. The active membrane area when mounted in a steel cell (see below) is 15 cm2.

4. Ultra-thin (< 1000 nm) Zeolite CHA Membrane tubes supported inside graded α-alumina supports with a length of 100 mm. The support has an inner diameter of 7 mm and an outer diameter of 10 mm and consists of a 30 µm inner layer with a pore size of 100 nm and a 1.5 mm thick base layer with a pore size of 3 µm. The active membrane area when mounted in a steel cell (see below) is 15 cm2.


Specifications

For MFI membranes:

  • Single gas helium permeance > 70 x 10-7 mol/(m2 s Pa) for dry membrane at room temperature.

  • Helium permeance < 0.5% of the single gas helium permeance for dry membrane at a relative n-hexane pressure of p/p0≈0.025 at room temperature.

For CHA membranes:

  • Single gas hydrogen permeance > 50 x 10-7 mol/(m2 s Pa) for dry membrane at room temperature.

  • SF6 permeance < 0.1 x 10-7 mol/(m2 s Pa) for dry membrane at room temperature. H2/SF6 permeance ratio > 500.

Zeolite membranes of many other framework types can be manufactured upon request.

Steel cells

We can provide steel cells for membrane discs and tubes. All membranes mounted in steel cells are designed to minimize effects of concentration polarization.

High-pressure steel cell for membrane discs (diam. 25 mm, 3 mm thick). Design pressure and design temperature are 0-100 bar and -150 to +350°C, respectively. The cell is equipped with a type K thermocouple.

Steel cell for membrane discs (diam. 25 mm, 3 mm thick). The cell is equipped with a type K thermocouple and graphite gaskets, which enables operation in a broad temperature and pressure range. It is the standard cell used by the research group at LTU and is a less costly alternative to the high-pressure cell (Picture 1).

Steel cell for membrane tubes (100 mm long, diam. 10 mm). Design pressure and design temperature are 0-30 bar and -20 to +50°C, respectively. Drying at 250°C without pressure. The cell is equipped with a type K thermocouple (Picture 2).

Delivery

The membrane will be mounted in a steel cell and delivered to the customer with a report of measured permeances as specified above. If a new membrane is needed, send the steel cell to us and we will mount a new membrane and verify the performance for you.

Quotations

Ask for quotations on membranes and cells.

Picture 1. Steel cell for membrane discs.

Picture 1. Steel cell for membrane discs.

Picture 2. Steel cell for membrane tubes.

Picture 2. Steel cell for membrane tubes.