MEMBRANE SPECIFICATIONS
Ceramic membranes: tubular, multi-channel
Porous support of pure α-Al 2O 3
Porous membrane layer of α-Al 2O 3, TiO2 or ZrO2
Temperature 33 to 440 °F
Limited by sealing materials and system construction
Thermal rate of change
max. D T = 30°C (sudden temperature changes)
10°C/min (max. temperature slope for heating up and cooling down)
pH 0 to 14
Burst pressure >1,400 psi
Operating limit is typically 145 psi maximum set by system construction limitations
(special designs may be much higher)
Impervious to most chemicals (see handbook)
MEMBRANE SPECIFICATIONS
Technical Data for Attaxx Al 2O 3 Ceramic Filter Membranes
support material |
alpha-Al 2O 3 |
membrane substrate |
MF: alpha-Al 2O 3 UF: TiO 2 |
mean pore diameter |
5kD, 10kD, 20kD,150kD,300kD: 0.05μm, 0.1μm, 0.2μm, 0.4μm,0.8μm, 1.2μm |
overall length |
1,000 mm and 1,200 mm |
pH operating range |
1 to 14 |
Designs suitable for steam sterilization have special epoxy or PTFE membrane end seals. |
Type (bore#/dia.) |
Geometry (mm) |
Number of channels |
Length (mm) |
Filter surface per element (m 2) |
1/6 |
|
1 |
1000 |
0.019 |
1200 |
0.023 |
1/16 |
|
1 |
1000 |
0.050 |
1200 |
0.060 |
7/6 |
|
7 |
1000 |
0.132 |
1200 |
0.158 |
19/3.3 |
|
19 |
1000 |
0.200 |
1200 |
0.240 |
37/2 |
|
37 |
1000 |
0.232 |
1200 |
0.279 |
19/6 |
|
19 |
1000 |
0.358 |
1200 |
0.430 |
37/3.8 |
|
37 |
1000 |
0.442 |
1200 |
0.530 |
61/2.5 |
|
61 |
1000 |
0.480 |
1200 |
0.575 |
Typical DI Water Flux Rates for Calculating Membrane Fluxes
1) 0.05 µm: ~ 700 l/h/m²/bar @ 20 °C, 5 m/s, DI water quality
2) 0.1 µm: ~ 1100 l/h/m²/bar @ 20 °C, 5 m/s, DI water quality
3) 0.2 µm: ~ 1200 l/h/m²/bar @ 20 °C, 5 m/s, DI water quality
4) 0.8 µm: ~ 1600 l/h/m²/bar @ 20 °C, 5 m/s, DI water quality
Calculating Parameters for Attaxx Membranes
The operating parameters must be chosen according to the medium to be filtered. We recommend using the following operating parameters as a starting point:
| |
1. Velocity inside membrane bores |
2. Trans-membrane pressure Δp |
| |
 |
 |
| |
c = Velocity |
Δp = Trans-membrane pressure |
| |
V = Feed volume flow |
P1 = Pressure at entry of module |
| |
A = Surface of ducts flown past |
P2 = Pressure at exit of module |
| |
|
Pp = Pressure of permeate |
| |
C ideal = approx. 4 - 6 m/s |
ΔP ideal = approx. 1.5 - 3 bar |
|
Velocity in the channel (m/s) |
|
4,0 |
4,2 |
4,4 |
4,6 |
4,8 |
5,0 |
5,2 |
5,4 |
5,6 |
5,8 |
6,0 |
membrane design |
Volume flow [m³/h] per membrane element |
1/6 |
0,40 |
0,43 |
0,45 |
0,46 |
0,49 |
0,51 |
0,53 |
0,55 |
0,57 |
0,59 |
0,61 |
1/16 |
2,9 |
3,1 |
3,2 |
3,3 |
3,5 |
3,6 |
3,8 |
3,9 |
4,1 |
4,2 |
4,3 |
7/6 |
2,9 |
3,0 |
3,1 |
3,3 |
3,4 |
3,6 |
3,7 |
3,8 |
4,0 |
4,1 |
4,3 |
37/2 |
1,7 |
1,8 |
1,8 |
1,9 |
2,0 |
2,1 |
2,2 |
2,3 |
2,3 |
2,4 |
2,5 |
19/3.3 |
2,3 |
2,5 |
2,6 |
2,7 |
2,8 |
2,9 |
3,0 |
3,2 |
3,3 |
3,4 |
3,5 |
19/6 |
7,7 |
8,1 |
8,5 |
8,8 |
9,3 |
9,7 |
10,0 |
10,4 |
10,8 |
11,2 |
11,6 |
37/3.8 |
6,0 |
6,34 |
6,6 |
6,9 |
7,3 |
7,6 |
7,8 |
8,2 |
8,4 |
8,8 |
9,1 |
61/2.5 |
4,3 |
4,5 |
4,7 |
4,9 |
5,2 |
5,4 |
5,6 |
5,8 |
6,0 |
6,2 |
6,5 |
example: volume flow for type 19/3.3
| |
velocity in the channel: |
5 m/s |
| |
membrane design: |
19-channel with 3.3 mm bores @ 0.2 μm |
| |
volume flow: |
2.9 m³/h |
| |
transmembrane Δp |
2 bar |
| |
flux rate: |
1200 x 0.2 x 2 = 480 l/h |
The flux rate of any membrane is very dependent upon the application. Flux rates vary with the fluid, with the temperature (viscosity affects), solids loading of the fluid, characteristics of the solids, operating pressure, etc. Because operating parameters have such a large impact upon flux rates, manufacturers use standardized flux rates stated at STP with DI water. Caution must be exercised during design because the actual flux obtained in a specific application will always be significantly different then STP DI water. The only reliable way to determine plant design requirements is by direct testing. Therefore MemPro cannot give you an accurate design flux rate for your application until either we or you perform the necessary tests.
To facilitate the testing and determination of sound design criteria, MemPro can provide a single membrane module (including a backpulse unit) that will accommodate any of our membrane configurations at 25.4 mm diameter. This assembly sells for $6,100 FOB factory.
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