Synder Flat Sheet Membrane, NDX, PA-TFC, NF, 47mm, 5/Pk
Synder NDX flat sheet membranes are suitable for nanofiltration applications; primarily dye concentration and dye desalination.
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YMNDX475
Synder
NDX
Polyamide TFC
47 mm
5
5-7 days
Specifications
NF Flat-Sheet Performance Comparison by Manufacturer:
Veolia | TriSep | Synder | Microdyn Nadir
FilmTec™
| Series | XC-N | NF245 |
|---|---|---|
| Feed | Industrial Wastewater | Food / Dairy |
| Type | High Recovery | Process |
| pH Range | 2-11 | 3-10 |
| Flux (GFD)/psi | 22.9/70 | 32.0 GFD/70 psi |
| MgSO4 Rejection | 98.0% | 1.0% |
| Pore size/ MWCO | <300 | |
| Polymer | Polypiperazine | Proprietary |
Veolia
| Series | Duracid NF | DK | DL |
|---|---|---|---|
| Feed | Industrial/Commercial | Foods/Industrial | Foods/Industrial |
| Type | Acid Purification, Mineral Concentration | High Rejection | Low Energy, Low Pressure |
| pH Range | 0-9 | 2-10 | 2-10 |
| Flux (GFD)/psi | 10-19/225 | 22/100 | 28/220 |
| MgSO4 Rejection | 98.0% | 98.0% | 96.0% |
| Pore size/ MWCO | ~150-200 Da | ~150-300 Da | ~150-300 Da |
| Polymer | Proprietary | Polyamide-TFC | Polyamide-TFC |
Veolia | TriSep | Synder | Microdyn Nadir
Synder Filtration™
| Series | NDX | NFG | NFW | NFX |
|---|---|---|---|---|
| Feed | Foods/Industrial/Waste | Foods/Industrial/Waste | Foods/Industrial/Waste | Foods/Industrial/Waste |
| Type | NA | High Flux, Softening | Softening | High Rejection, Softening |
| pH Range | 4-9 | 4-10 | 4-10 | 3-10.5 |
| Flux (GFD)/psi | 35-45/110 | 65-70/110 | 50-55/110 | 30-35/110 |
| MgSO4 Rejection | 95.0% | 50.0% | 97.0% | 99.0% |
| NaCl Rejection | NA | 10.0% | 20.0% | 40.0% |
| Pore size/MWCO | ~500-700 Da | ~600-800 Da | ~300-500 Da | ~150-300 Da |
| Polymer | Polyamide-TFC | Polyamide-TFC | Polyamide-TFC | Polyamide-TFC |
Veolia | TriSep | Synder | Microdyn Nadir
TriSep™
| Series | TS40 | TS80 | SB90 | XN45 |
|---|---|---|---|---|
| Feed | Foods/Industrial/Waste | Foods/Industrial/Waste | Liquid Foods | Foods/Industrial/Waste |
| Type | Process | Softening | Chlorine Resistant | Process |
| pH Range | 2-11 | 2-11 | N/A | 2-11 |
| Flux (GFD)/psi | 20/110 | 20/110 | 30/225 | 35/110 |
| MgSO4 Rejection | 90.0% | 99.0% | 97.0% | 95.0% |
| NaCl Rejection | 40-60% | 80-90% | 85.0% | 10-30% |
| Pore size/MWCO | ~200 Da | ~150 Da | ~500 Da | |
| Polymer | Polypiperazine-amide | Polyamide-TFC | Cellulose Acetate | Polypiperazine-amide |
Veolia | TriSep | Synder | Microdyn Nadir
Microdyn Nadir™
| Series | NP010 | NP030 |
|---|---|---|
| Thickness | 210-250 µm | 210-250 µm |
| Type | Acid/Caustic Preparation, Metal, Chemical | Acid/Caustic Preparation, Metal, Chemical |
| pH Range | 0-14 | 0-14 |
| Na2SO4 Rejection | 35-75% | 80-95% |
| Processing Temp. | 5-95°C | 5-95°C |
| Polymer | PES | PES |
| Backing | PE/PP | PE/PP |
| Water Flux | >200 lmh/40 bar | >40 lmh/40 bar |
| Pore size/MWCO | ~1000 Da | ~500 Da |
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Frequently Asked Questions
Q: I have a membrane sample that is too large to fit in my stirred cell. Can I cut it to fit?
Yes—flat sheet membranes can be cut to fit your stirred cell. For best results, use the stirred cell support disk as a template to trace the correct size, then cut the membrane carefully to match.
Q: I have a polymeric stirred cell and discovered that my disk size is not listed in the ordering information for the flat sheet membranes. Can I purchase the flat sheet membranes in the correct disk size for my stirred cell?
Yes, we can supply the flat sheet membranes in the correct disk size for your stirred cell. Please contact us at [email protected] for pricing and availability.
Q: How do I store used flat sheet crossflow membranes?
Used flat sheet crossflow membranes must be stored wet at all times. If a membrane is allowed to dry out, it can irreversibly lose water permeability and performance.
For storage, place the membrane fully submerged in one of the following solutions:
0.5% formaldehyde solution (helps prevent microbial growth)
1.0% sodium metabisulfite (SMBS) solution -- Replace the SMBS solution monthly to maintain effectiveness
UPDI water (ultrapure deionized water)--Replace the water weekly to reduce contamination and biofouling
Q: Are the flat sheet membranes available as roll stock?
Yes, we are able to offer some of the flat sheet membranes as roll stock. Please contact us at [email protected] to inquire about pricing and availability.
Q: Why is the flat sheet membrane I'm using measuring a flux value less than the published flux value?
Flow characteristics for a spiral element and flat sheet membrane are significantly different and are really only comparable on a qualitative basis. Variability in the membrane manufacturing process, differences in water composition, test procedures, and test equipment, used in a factory, laboratory, or elsewhere, will impact water flux results.
Reference: Understanding Variation of Experimental Flux and Rejection
Q: Do you offer samples of the flat sheet cross flow membranes?
We do not offer complimentary samples of the flat sheet crossflow membranes. However, most customers find the standard pack quantities to be quite reasonable for initial evaluations. For customers that want to evaluate several different membranes, we do offer custom variety packs. And, in some instances, we may be able to offer custom packs containing smaller sheet quantities. Please contact us to inquire about pricing and availability.
Q: What is the shelf life for the flat sheet crossflow membranes?
Sterlitech flat sheet crossflow membranes should be stored sealed in the original packaging in a climate-controlled environment, protected from direct light, heat, and temperature extremes. While we recommend using membranes as soon as practical after receipt, most flat sheet membranes can typically be stored for up to one (1) year without affecting performance when stored properly.
Q: We noticed that there are water drops in the flat sheet membrane sealed bag. Is that a quality issue?
Some manufacturers supply their membrane in wet to prevent the membrane from going dry. There is always moisture in these sealed bags and it is not uncommon for some condensation (droplets) to form.
Q: How should I remove the preservative solution from the membrane and is there any specific recommendations before use?
Rinsing the membrane on both sides with a stream of clean water is sufficient to remove the preservative solution. There is no need to pre-condition.
Q: The Flat Sheet Membranes appear dry in their packaging. How do I pre-wet them? Do I need to do this?
Yes, you need to pre-wet the membranes. The best procedure is to place them in a dry holder and allow them to wet from the inlet side first. It may be best to perform this operation with water or a buffer, then dispose of the first rinse, and introduce the process fluid. This prevents any wetting agents or preservatives from mixing with the process solution.
Q: Can I reuse flat sheet membranes after they have been removed from a test cell?
Yes, you may attempt to reuse flat sheet membranes. However, you may find it difficult to achieve a leak free seal. The cell body o-rings necessarily compress the membrane during installation and the physical action of separating the membrane from the o-rings during removal may cause damage. This damage can impede that ability to achieve a leak free seal when the membrane is reused.
Q: I accidentally allowed my flat sheet crossflow membrane to dry out. Can I still use it?
Unfortunately, allowing a previously wetted crossflow membrane to dry usually results in permanent reduction of water permeability. Nevertheless, you can attempt to re-wet the membrane and use it. First, soak the membrane in a 50% alcohol solution for at least 15min (ethanol, methanol, or IPA would be acceptable). Next, install the membrane in the test cell and operate the cell with purified deionized water as though you were pre-conditioning the membrane. After about 30min, the permeate flux should stabilize to whatever rate the membrane is now capable of.
Q: How do I clean the flat sheet membranes?
Determining which solution to use to clean a flat sheet membrane depends on the substance it is fouled with. As a general rule, you can use a caustic or oxidant solution for organic fouling and an acidic solution for inorganic causes. Please remember that different membranes polymers have different pH tolerances.
Q: Do I need to pre-condition the flat sheet membranes? And, if so, what is the recommended procedure?
Yes, for flat sheet membranes that will be used with water or aqueous solutions, we recommend that you pre-condition the membranes prior to conducting your separation experiments. Pre-conditioning helps ensure that the membranes perform as expected. Also, pre-conditioning removes preservatives and other residuals from the membranes. Purified deionized water is used to pre-condition the membranes. For all flat sheet membranes except the forward osmosis (FO) membranes, install the membrane in the test cell and apply the purified deionized water feed at the normal operating rate and pressure for the membrane. Allow the system to operate with the purified deionized water feed until the permeate flux stabilizes at an expected value. You can now replace the purified deionized water feed with your feed solution and begin your experiments.
Q: What is the recommended cross flow velocity (CFV) for the flat sheet membranes?
Most membrane manufacturers recommend CFVs of 5 to 35cm/s for their spiral wound membrane elements. The flat sheet membranes can be operated in this range to simulate use in such elements. Additionally, the flat sheet membranes may be operated outside of this range by users that want to examine the relationship between CVF and fouling and membrane performance in their applications.
Q: How do I calculate the cross flow velocity (CFV) for flat sheet membranes?
Cross flow velocity (CFV) is the linear velocity of the feed flow tangential to the membrane surface and is typically reported in m/sec or ft/sec. It is calculated by dividing the volumetric flow rate through the feed channel by the cross-sectional area of the feed channel. Please refer to the CFV article at Tech Tips for more information.
Q: What is the recommended transmembrane pressure (TMP) for the flat sheet membranes?
The recommended TMP will depend on the type of flat sheet membrane and on the application. Typically, a reasonable TMP will be the same as that noted for the permeate flux specification of the membrane. The specifications for any of the flat sheet membranes can be easily found on our website by clicking the “application/specification” tab on the product web page and scrolling down as necessary. Please contact us at [email protected] if you need additional assistance.
Q: I have noticed that the flat sheet membranes come in sizes described as CF016, CF042, and Sepa CF. What are these sizes?
These membrane sizes are intended for use in the bench-scale crossflow test cells offered by Sterlitech. Please see the list of flat sheet membranes we offer and their dimensions: HP4750 Stirred Cell: 47 mm (1.85") discs, CF016 cell: 58 x 75 mm (2.26 x 2.95") coupons, CF042 cell: 56 x 115 mm (2.20 x 4.53") coupons, Sepa CF cell: 140 x 190 mm (5.51 x 7.48") coupons, CF047 circular cell: 47 mm discs, CF090 circular cell: 90 mm discs
Q: What is the sodium chloride rejection for the Dow nanofiltration (NF) membranes?
For a feed solution of 2,000 ppm sodium chloride (NaCl) at 70 psi (0.5 MPa) and 77°F (25°C), the NF90 membrane has sodium chloride rejection of between 90-96% while the NF270 membrane has approximately 50% rejection.
