Filtering Systems banner

Coalescing Filter

A reliable source for Coalescing Filter information and leading Coalescing Filter Companies & Manufacturers.

A coalescer, also known as a coalescing filter, is a device that uses the coalescence principle to separate fluid mixtures into different fluids. In the process of coalescence, molecules of the same fluid clump together to form a larger fluid unit. Similar to particulate filters, coalescing filters are used to separate the particulate components of mixtures- in this situation, mixtures of liquids. Read More…

Coalescing Filter Coalescing filters are specialized filter media designed to collect and remove oil and other vapors or mists from process air streams. Similar to mist collectors or eliminators, coalescing filtration systems force air or gas through a series of fibrous panels or films.
Request For Quote

Leading Manufacturers

Middletown, CT  |  800-543-5843

Our company is the filtering systems expert. We know everything there is to know about filtering liquids and oils for many industries ranging from the petrochemical industry to waste water management. It is our goal to provide customized solutions that you can trust and rely on every day. You will find that our attention to detail and superior service can help you in multiple ways. Contact us to learn more!

Request A Quote

Shelco Filters $$$

Mira Loma, CA  |  800-360-8380

Designers and manufacturers of water filter systems and wastewater systems for industrial filtration, municipal and commercial filtration applications, Everfilt® is suitable for water and any low viscosity liquid. We have served a variety of industries with quality filtration equipment.

Request A Quote

Everfilt® $$$

Glasgow, DE  |  302-731-1700

Graver Technologies Air and Gas Filtration offers a vast array of filtration products. If your application is fuel gas filtration on an off-shore platform, or the protection of down-stream instrumentation, or the recovery of precious metals, Graver Technologies has a cost-effective filter solution for you, from standard products to custom-designed solutions.

Request A Quote

Graver Technologies $$$

North Tonawanda, NY  |  716-693-9381

Since being founded in 1956, Ascension Industries has been a leading manufacturer of filtration systems. From concept to design, Ascension Industries provides our customers with outstanding service and high-quality products. We supply Durco Industrial Filtration (a wide range of industrial and municipal filtration systems, as well as filter parts and service) equipment.

Request A Quote

Ascension Industries, Inc. $$$

Salt Lake City, UT  |  801-487-7761

Since 1943, Peterson Filters has designed/manufactured and offered high-quality industrial vacuum filtration systems, filtration laboratory testing and filtration equipment for the mining and process industries. Contact us for all of your filtering needs.

Request A Quote

Peterson Filters Corporation $$$
placeholder image Shelco Filters Everfilt® Graver Technologies Ascension Industries, Inc. Peterson Filters Corporation

coalescing filter

Coalescers can be used independently or as parts of larger separation units. The appropriate type of coalescing filter must be chosen based on the characteristics of the substances to be separated. For instance, a gas coalescer is used to extract gasses from gas-fuel or gas-water emulsions, whereas an oil coalescer or fuel coalescer can be used to recover oil or fuel from a water-oil mix, respectively.

How Coalescing Filters Work

A coalescing filter is a filtration system made up of several baffle walls or screens. The filter receives a stream of fluid that needs to be separated (such as a gas-water mixture), and the baffles separate the various components by trapping them in distinct areas based on their weight and density. Once the undesired, polluting fluid is drained away for purification or disposal, the desired fluid can be recovered in its original state.

The screening mechanism of a coalescing filter operates based on the physical characteristics of the different fluids, such as molecular weight and density. While a liquid’s vapor molecules diffuse through the filter element to coalesce and be drained out of the system gravitationally, the molecules of the undesired fluid are diverted in one direction to a drain point by the baffle walls in the coalescing filter.

coalescing filtration process

In a similar way, "wet gas" (gas stream containing water droplets) is fed into the coalescer inlet, diffuses through a filter element, and departs via an output port as dehydrated gas in gas-water separation. For drainage, the denser fluid’s molecules agglomerate and sink to the tank's bottom. The removed fluid is discarded in some applications after it is collected and recycled when it is a valuable liquid.

A coalescing filter may employ a third layer when precious oils or aerosols need to be collected. In these instances an inner layer made of very fine material is set between the two outer layers to ensure that the resulting coalesced material is further purified. Regardless of the number of layers, the fibrous materials that make up coalescing filter panels or cartridges form a sophisticated matrix or lattice. Examples include fiberglass, closed-cell foam, borosilicate microglass, and other long-lasting and chemically-resistant latticed materials.

Types of Coalescing Filters

Mechanical Coalescing Filters

Mechanical coalescing uses a number of barriers, or filter elements, for separation. The production of coalescing filter elements frequently uses membrane technology and borosilicate (boron and silicates) microfibers. The selection of specific filter elements determine how pure the final products are after separation. Mechanical coalescers are employed in oil refineries to separate water vapor from hydrocarbon condensate by coalescing the water molecules into larger particles that are then drained out of the system.

mechanical coalescing filter

Electrostatic Coalescing Filters

Electrostatic coalescing filters use an AC (alternating current), DC (direct current), or a combination of both currents to cause droplet coalescence in fluid mixes. By applying an electric charge to the fluid, electrostatic coalescers destabilize the emulsion and enlarge the molecules, forcing them to fall into a collection tank for drainage.

electrostatic coalescing filter

For this reason, AC currents in the 50–60 Hz (Hertz- a unit used to measure sound waves) range are typically employed. Fluid molecules condense to form heavier molecules as a result of the forces of attraction created by a produced electric field. Electrostatic coalescers are frequently used for separating water-fuel emulsions in offshore oil and gas production facilities.

Benefits of Using Coalescers

Coalescers used in microfiltration provide products with up to 95% purity. Additionally, they are environmentally benign and use a lot less electricity than other industrial filtration techniques.

Applications of Coalescing Filters

Coalescers are used in the oil and gas industry for product refinement. Coalescing filters are employed at natural gas refineries to dehumidify natural gas and guarantee product purity before selling this product. Aerosols, particulate matter, dissolved hydrocarbon liquids, and sludges are just a few of the fluids that are pumped into the compressor inlet and are removed by a coalescing filter.Systems that use gas-oil coalescers can clean natural gas by removing condensate and a number of natural liquids.

Additionally, by removing impurities like water vapor and sulfur with efficiency as high as 99.98%, coalescing filters are actively utilized to avoid corrosion in downstream oil and gas assets like compressors, amine/glycol absorbers, turbines, and membrane filtration systems. When positioned at a compressor's outlet, coalescing filters can be used to collect lubricating oil from the device.

Prior to storage of gas, water vapor, amine solutions, and sulfur can be phase-removed from petrochemical feedstock using liquid-liquid coalescers. This process not only ensures product purity, it also stops industrial equipment from corroding.

Coalescing Filters Informational Video

 
Air, Liquid, and Filtering Systems
Featured Industries