Demister pads, also called demister, mister eliminator, vapor pad, is installed at the top of packed tower to used for removing micron-sized liquid particles from a vapor stream. It is made of knitted wire mesh, which is woven interlocked to increase contact surface and improve separating efficiency. Stainless steel, copper, Monel and other alloy as well as polypropylene and other non-metallic materials make demister pad be used in more corrosive and high temperature applications. Generally, the demister pad is commonly used with structured packing and random packing
Demister pads can help to improve the operating condition, optimize process indicators, increase the amount of processing and recovery of valuable materials, protect the environment, and decrease air pollution.
The demister (demister pads) are installed at the top of packed tower. When the vapors carrying liquid entrainment rises at a constant speed and passes through the demister surface (interlocking knitted wire mesh), the vapor can easily passing through the demister while the rising liquid entrainment will collide with the mesh filament due to the inertia effect and are captured by the woven interlocked structure. Then the liquid will grow bigger and fall free when the droplets gravity exceeding vapor rising force and liquid surface tension force. As a result, the clean vapor passes through the demister and discharge out of the packed tower.
| Material | Products Separated |
|---|---|
| SS304 | For nitric acid, water steam |
| SS304L | For petroleum Fractions |
| SS316 | For fatty acids, reduced crude |
| SS316L | Reduced crude containing acid & other corrosive |
| Copper | Alcohol, Aldehyde, Amines |
| Monel | For caustic soda & other alkali, dilute acid |
| Nickel | For caustic soda, food product |
| Alloy 20 | Nitric acid, alkaline PH |
| Teflon FEP | For Highly corrosive conditions |
| Hostaflon PTFE | For Highly corrosive conditions |
| Inconel 825 | For dilute acid media & alkaline solution |
| Inconel 625 | For phosphoric and fatty acid |
| Polypropylene | For hydrilic acid, corrosive service at moderate temperature |
| P.V.D.F. | Corrosive Service for Temperature 140 °C |
| P.T.F.E. / FEP / PFA / ETFE / ECTFE | For highly corrosive and high temperature |
| Hostaflon | Sulphuric acid plant, temperature up to 150 °C |
| Glass Wool | For very fine mists |
| Item | Density (kg/m3) | Free volume (%) | Surface area (m2/m3) | Application |
|---|---|---|---|---|
| 1BDP-80 | 80 | 99.0 | 158 | Moderate fouling, minimum press drop, dirty service |
| BDP-144 | 144 | 98.2 | 280 | Heavy duty, e.g. oil & gas separators |
| BDP-128 | 128 | 98.4 | 460 | Light fouling, high velocity, dirty service |
| BDP-193 | 193 | 97.5 | 375 | General purpose, optimum efficiency & pressure drop, heavy duty |
| BDP-220 | 220 | 97.2 | 905 | General purpose, optimum efficiency & pressure drop, high corrosive condition |
| 1 density 80 is suitable for both metal materials and plastic materials. Other models is only suitable for metal materials. |
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