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Product details
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Product Code: |
11222532816 |
Product Name: |
Dow reverse osmosis membrane | |
Specifications: |
50G/75G/100G | |
Product Remarks: |
Dow film DOW from the United States | |
Product Category: |
Laboratory Ultra Pure Water Machine Accessories Series | |
Dow FILMTEChigh-performancereverse osmosis membrane
dowThe chemical company is the only company in the world that possesses both membrane and ion exchange resin separation technologies and products. The registered trademarks for membrane products are FILMTETCM, and for ion exchange resins are DOWEX *, MARATHON *, UPCORE *, and MONOSPHERE *. It is managed by Dow Chemical's liquid separation division and uses Dow water treatment products, allowing users to achieve the highest water quality at the lowest cost.
Since Dow FilmTec first invented practical composite membranes in the world, membrane and its application technology have experienced unprecedented development. The exploration and large-scale application of many fields began with the use of Dow membrane components. FILMTEC's reverse osmosis and nanofiltration membrane products are recognized as well-known brands of separation membranes with higher performance, consistency, and stability, and have the world's largest market share. Detailed Introduction
Dow FILMTEC ™ Reverse osmosis components are the highest quality and most reliable membrane components on the market. By adopting leading membrane making technology and fully automatic rolling technology, Dow membrane components have long-term stable performance, higher desalination rate, and lower operating costs. The product series covers household components to seawater desalination and new nanofiltration components. After long-term use by users, it has been proven to have a long service life, stable performance, low pollution, and good cleaning recovery. It is only produced in the United States and has passed the strict IS09 000 quality system certification as the earliest.
The composite film was first developed by FilmTec company, and its proprietary film chemical materials, formula, and production line make FILMTEC film have extremely high compressive strength, wear resistance, and chemical degradation resistance; The widest pH resistance range allows for strong and efficient cleaning with ordinary acid and alkali, resulting in more thorough cleaning and lower long-term operating pressure of the membrane system, which can significantly reduce operating costs. Dow FILMTEC ™ The reverse osmosis element membrane has no defects such as pinholes, and there are no patches generated by repairing defects. Dow FILMTEC ™ The desalination layer of the reverse osmosis membrane is thicker, more uniform, and smoother. Components rolled with such membranes are more reliable, have a longer lifespan, and ensure long-term stability. ※dowFILMTEC ™Reverse osmosis elementThe inlet channel is wider, the flow is more uniform, and it is less prone to pollution. Even if pollution occurs, it is easier to clean. The FILMTEC component has shorter and more membrane blades, resulting in a significant decrease in the local maximum flux value of the membrane and a significant reduction in fouling rate. FILMTEC components are sourced from the most advanced fully automated production lines, and FilmTec is the only company with dry component production technology and equipment. The performance of the components produced is more consistent, ensuring the long-term reliability of the system. Dry components generally have no shelf life limit and are easier to store. Therefore, important users, well-known design institutes, and engineering companies always prioritize them when designing water treatment projectsDow FILMTECBrand. Dow film is widely used in fields such as power, petrochemicals, steel, electronics, pharmaceuticals, food and beverage, municipal and environmental protection. It plays an important role in desalination of seawater and brackish water, preparation of boiler feedwater, industrial pure water and electronic grade ultrapure water, production of drinking pure water, wastewater treatment and special separation processes. Dow FILMTEC ™ Reverse osmosis components have become the most trusted products for pure water machine equipment manufacturers, agents, and users. Dow FILMTEC dry film components have a longer storage period and are easier to transport. These membrane components all comply with NSF/ANSI standards. FILMTEC membrane components have a rated pressure of 50ps (3.4bar), which is 20% higher in water production than equivalent membrane components from other brands at a rated pressure of 60ps.
 Related parameters
Product Specification
1. The water production and desalination rate are based on testing conditions: 250ppm softened tap water, 25 º C, 15% recovery rate, and the rated operating pressure mentioned above.
2. Minimum desalination rate 96.0% 3. The possible range of variation for the water production of a single component is ± 20%. 4. TW30-1812 membrane element with a nominal inner diameter of 2 inches housing. 1 inch=25.4 millimeters
Operating limit value
Types of membranesPolyamide composite film Maximum operating temperature 45 ℃ Maximum operating pressure 300psi (21bar) Maximum feedwater flow rate of 2.0gpm (7.6lpm) Continuous operation pH range 2-11 Short term cleaning pH range (30 minutes) 1-12 Maximum water supply SDI SDI 5 Free chlorine tolerance b<0.1ppm a、 When pH>10, the maximum temperature for continuous operation is 35 º C (95 º F); b 、 Under certain conditions, the presence of free chlorine and other oxidants in the influent can cause severe membrane damage. As oxidative damage is not covered by the product warranty, FilmTec recommends removing residual free chlorine during pre-treatment before the membrane. general information 1. When the membrane element is first used, the product water in the first full tank should be drained and not used. 2. Once the component is soaked, it should always be kept moist. 3. If the design guidelines and operating limits in the technical bulletin are not strictly followed, the limited quality assurance will be invalidated. 4. During system shutdown, transportation, and storage, in order to prevent microbial growth, we recommend immersing the membrane components in a preservation solution. The standard storage solution contains 1.5% by weight of sodium bisulfite (food grade). 5. The components need to be used for at least 6 hours before they can be disinfected with formaldehyde. If formaldehyde is used within 6 hours, it may result in flux loss. 6. The membrane has a certain resistance to short-term attacks from chlorine (hypochlorite), but continuous contact can damage the membrane, so it should be avoided. 7. The customer shall be responsible for the impact on the components caused by the use of chemicals that are incompatible with the membrane components. Using incompatible drugs will void the limited quality assurance. reverse osmosis membraneFactors affecting performance 1The impact of inlet pressure on reverse osmosis The inlet pressure itself does not affect the excess salt permeability, but an increase in inlet pressure leads to an increase in the net pressure driving reverse osmosis, resulting in an increase in water production. At the same time, the excess salt permeability remains almost unchanged, and the increased water production dilutes the salt passing through the membrane, reducing the salt permeability and improving the desalination rate. When the inlet pressure exceeds a certain value, the high recovery rate increases concentration polarization, which in turn leads to an increase in permeability, offsetting the increased water production and preventing further increase in desalination rate. 2The effect of inlet water temperature on reverse osmosis membraneeffect The conductivity of reverse osmosis water production is highly sensitive to changes in the inlet water temperature. As the water temperature increases, the water flux also increases linearly. For every 10 ℃ increase in inlet water temperature, the water production flux increases by 2.5% to 3.0%; The reason is that the viscosity of water molecules passing through the membrane decreases and the diffusion performance is enhanced. The increase in inlet water temperature will also lead to an increase in salt permeability and a decrease in desalination rate, mainly because the diffusion rate of salt through the membrane will accelerate with the increase in temperature. 3Inlet pHValue for reverse osmosis membraneeffect The pH value of the influent has almost no effect on the water production; And it has a significant impact on the desalination rate. Due to the dissolved CO in water2When the pH value is low, it forms gaseous CO2The form exists and is easy to pass through the reverse osmosis membrane, so the desalination rate is also lower when the pH is low. As the pH increases, gaseous CO2Convert to HCO3–And CO32–The ion and desalination rate gradually increase, reaching the highest desalination rate between pH 7.5 and 8.5. 4The effect of influent salt concentration on reverse osmosis membraneeffect Osmotic pressure is a function of the concentration of salt or organic matter in water. The higher the salt content, the higher the osmotic pressure. When the inlet pressure remains constant, the net pressure will decrease and the water production will decrease. The salt permeability is proportional to the difference in salt concentration between the front and back sides of the membrane. The higher the salt content in the influent, the greater the concentration difference, resulting in an increase in salt permeability and a decrease in desalination rate. 5Recovery rate on reverse osmosis membraneeffect The reverse osmosis process is achieved by applying pressure to the inlet water when the natural permeation flow direction between concentrated and dilute solutions is reversed. If the recovery rate increases (with constant inlet pressure), the residual salt content in the raw water will be higher, and the natural osmotic pressure will continue to increase until it is the same as the applied pressure. This will counteract the pushing effect of the inlet pressure, slow down or stop the reverse osmosis process, and reduce or even stop the permeate flux. |
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