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High Performance Membrane Products: |
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Pureflow manufactures and sells twenty-nine different types of sheet ultrafiltration (UF), microfioltration (MF), nanofiltration (NF), and reverse osmosis (RO) membranes. These membranes display a range of performance characteristics for use in many applications.All are provided as rolls of dry membrane in the exact lengths, widths, and roll sizes best suited for customers.
Most UF and MF membranes are available on several backing materials, including those made with polyester and poly-proplyene. All of the membranes meet the U.S. FDA requirements for repeated-use food contact. |
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Ultrafiltration and Microfiltration Membranes: |
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In the tables below, membranes are characterized in terms of pure water flux (L/m2 –h, or Lmh) per unit driving pressure (bar) at pH 7.5 and 25°C, or “normalized water flux” values can vary ±15% for individual tests. |
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Pore sizes for UF membranes are indirectly determined using “markers” having different molecular, weights (Daltons) of poly(ethylene glycol) (PEG) or poly(vinyl alcohol) PVA at a concentration of 2 g/L in pure water, indicated below as “nominal marker rejection” |
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Pore sizes for membranes are also determined directly by the mercury intrusion method. |
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Microfiltration membranes are defined as those with an average pore size >0.10u.m. |
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Normal limits are 150 psi (10 Bar), 50° for continuous operation, and pH 1.5-11.5 at 50° C for short term cleaning. |
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Polysulfone (PS) Membranes :
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| Type |
Applications |
Normalized Water Flux
(Lmh/bar)
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MW of Marker
(Dalton)
|
Normal Marker Rejection
(%)
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| PS-20 |
Process Water Treatment |
1,000 |
20K PEG |
95% |
| Wastewater Treatment |
| Clarifications |
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Poly(vinylidene fluride) (PVDF) Membranes : |
| Type |
Applications |
Normalized Water Flux
(Lmh/bar) |
MW of Marker
(Dalton) |
Normal Marker
Rejection
(%) |
| PVDF-200 |
Process Water Treatment |
175 |
75KPVA |
97 |
| PVDF-350 |
Electrocoat Paint Recovery |
300 |
75KPVA |
96 |
| PVDF-400 |
Wastewater Treatment |
400 |
75KPVA |
95 |
| PVDF-700 |
Textile Size Recovery |
650 |
75KPVA |
53 |
| PVDF-400B |
Resource Recovery
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1000 |
75KPVA |
96 |
| Clarification |
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| Ultrafiltration and Microfiltration Membranes : |
| Type |
Applications |
Normalized Water Flux
(Lmh/bar) |
MW of Marker
(Dalton) |
Normal Marker
Rejection
(%) |
| PAN-50 |
Process Water Treatment |
140 |
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90 |
| PAN-200 |
Pervaporation Substrates |
300 |
20K PEG
|
85 |
| PAN-350 |
Wastewater Treatment |
1000 |
20K PEG
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82 |
| PAN-400 |
Oily feed water treatment |
600 |
20K PEG
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75 |
| PAN-400 C/D |
Wastewater membrane bioreactors |
1000 |
20K PEG
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75 |
| PAN-450 |
Resource Recovery |
1200 |
20K PEG
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75 |
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| Polyethersulfone (PES) Membranes : |
| Type |
Applications |
Normalized Water Flux
(Lmh/bar) |
MW of Marker
(Dalton) |
Normal Marker Rejection
(%) |
| PES-5 |
Proteins
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70 |
6K PEG |
93 |
| PES-10 |
Gelatin
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105 |
10K PEG |
95 |
| PES-20 |
Enzymes |
300 |
20K PEG |
95 |
| PES-900C/D |
Whey Protein |
1500 |
20K PEG |
80 |
| Wastewater Membrane Bioreactors |
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| ULTRAFILTRATION AND MICROFILTRATION MEMBRANES : |
| Type |
Applications |
Normalized Water Flux
(Lmh/bar) |
PORE SIZE (U.M) |
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PVDF- MFB
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Process Water Treatment |
1800 |
0.13 |
| Wastewater Treatment |
| Clarifications |
| Suspended Solids Removal |
| RO Pretreatment |
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| Membrane Bioreactor (MBR) Membranes : |
| Type |
Applications |
Normalized Water Flux
(Lmh/bar) |
MW of Marker
(Dalton) |
Normal Marker Rejection
(%) |
| Pan-400C/D |
Wastewater membrane bioreactors |
200 |
20K PEG |
75 |
| Pan-900C/D |
100 |
20K PEG |
80 |
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1900 |
Pore Size:0.09u.m |
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200 |
20K PEG |
95 |
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| Nanofiltration (NF) and Reverse Osmosis (RO) Membranes : |
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All are polyamide, thin-film composite membranes on a polyester backing with a polysulfone substrate. |
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Membranes are characterized in terms of water flux(Lmh and gal/ft2 –d or gfd) and rejection of salt solutes at the specified pressures. |
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Membrane properties are normalized to 25°C (77° F) and pH 7.5 |
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Microfiltration membranes are defined as those with an average pore size >0.10u.m. |
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Normal operation limits of 1,200 psi(83 bar), 50° C (122° F) and pH 3-10; cleaning pH range at 50° C of pH 2-11 |
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| Nanofiltration (NF) Membranes : |
| Type |
Applications |
Test Pressure |
Solute Concentration
(mg/L) |
Solute |
Water Flux
(gfd/Lmh) % |
Solute Rejection
(%) |
| NF-1 |
High multi-valent ion rejection |
150/10.3 |
2000 |
MgSO4
NaCl
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65/110 |
99.5
90.0 |
| NF-2 |
High water flux Selective solute seperation |
150/10.3 |
2000 |
MgSO4
NaCl |
80/135 |
98.0
50.0 |
| NF-3 |
Selective solute separation
High multi-valent ion rejection
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150/10.3 |
2000 |
MgSO4
NaCl |
25/42 |
99.0
55.0 |
| NF-20 |
Selective solute separation Glycol recovery |
150/10.3 |
2000 |
MgSO4
NaCl |
25/42 |
98.0
35.0 |
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| Reverse Osmosis (RO) Membranes |
| Type |
Applications |
Test Pressure |
Solute Concentration
(mg/L) |
Solute |
Water Flux
(gfd/Lmh) % |
Solute Rejection
(%) |
| RO-1 |
Low Pressure |
125/8.6 |
2000 |
MgSO4
NaCl |
30/15 |
98.0 |
| RO-2 |
Medium Pressure High Water Flux |
225/15.5 |
2000 |
MgSO4
NaCl |
35/60 |
99.0 |
| RO-3 |
Medium Pressure |
225/15.5 |
2000 |
MgSO4
NaCl |
25/42 |
99.0 |
| RO-4 |
High Pressure High solute rejection |
800/55.2 |
32800 |
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20/34 |
99.5 |
| RO-6 |
High pressure very high solute rejection |
800/55.2 |
32800 |
MgSO4
NaCl |
17/29 |
99.8 |
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