At Mott, we offer a full range of liquid-liquid and gas-liquid coalescers and coalescing systems for use in various industrial applications to remove particulate matter, water, and other liquids. The CC Series Liquid-Liquid Coalescers are designed to separate two liquid phases with different characteristics of density, viscosity and interfacial tension (IFT). They efficiently separate liquid-liquid emulsions in oil, gas, and chemical applications extending equipment life. The GLP Series Gas-Liquid Coalescers are designed to remove water, carried over amine aerosols and fine particulate from process gas, fuel gas, natural gas, methane, hydrogen and other technical gases. Coalescers, pre-filters, and full systems are available.

Coalescers are used in oil refineries to remove oil and water from hydrocarbon gases. In the refining process, they are placed between the atmospheric distillation column and the vacuum distillation column. Coalescers work by bringing oil and water droplets together, so they may be separated easily. A coalescer air filter is typically used in compressed air systems to remove oil and water vapor from the air. The coalescing filter – made up of a succession of filtering media that combine contaminants to make them easier to separate fluid mixtures – is used to remove contaminants before they can enter the system and cause damage.

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Literature & Data Sheets

Gas-liquid coalescers are used upstream of the deoxidation process in hydrogen generation preventing deactivation. They can also be used upstream of hydrogen compressors reducing water content at the lowest quantity achievable <0.01 ppm. Most often gas-liquid coalescers can be found downstream of the compressor in order to remove oil content from the hydrogen gas stream.

Typical Applications

  • FCC/RFCC Refining
  • Crude and Vacuum Distillation
  • Hydrotreating
  • Hydrocracking
  • Amine Sweetening
  • Petrochemicals – Steam Cracking
  • Downstream Oil and Gas Operations

ASCO CC-T Series Liquid-Liquid Coalescers

3.75" and 6"OD Cartridges in Fluoropolymer, Nylon or Polyester Media. The CC-T series coalescing cartridges have been designed to provide high separation efficiencies in those applications where traditional fiberglass cartridges are inefficient.

ASCO CC-M Series Liquid-Liquid Coalescers

2.5" OD Cartridges in Polyester, Polyolefin, or Polyamide Media. The CC-M series coalescing cartridges have been designed to provide high separation efficiencies in those applications where traditional fiberglass cartridges are inefficient.

ASCO LL Systems Liquid-Liquid Coalescers

Liquid-Liquid Coalescers with Cartridge systems - available in vertical and horizontal designs.

ASCO GLP Series Gas-Liquid Coalescers

The GLP series gas-liquid coalescer elements are manufactured with a series of high performance micro fiberglass, polypropylene, polyester or nylon coalescing media in a pleated configuration optimized for liquid separation.

ASCO LG Systems Liquid-Gas Coalescers

Gas-Liquid Coalescers with Cartridge systems - available in vertical and horizontal designs.

Lab and Engineering Services

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Product Specs


Liquid-Liquid Coalescer Filters:

Standard Length – 40”

Standard Diameters – 3.75” and 6″

Gas-Liquid Coalescer Filters:

Standard Length – 36″ and 40”

Standard Diameters – 2.75″, 4.5” and 6″

Many Other options are available, consult factory

Material Choices

Liquid-Liquid Coalescer Filters:

Coalescing Media – Fluoropolymer, Polyester, Polyolefins, Nylon

Support Layers – Cellulose, Polyester, Polypropylene, Nylon

External Drain Sleeve – Polyester, Cotton

End Caps – Tinned Steel, Stainless Steel, Epoxy Coated Steel

Gas-Liquid Coalescer Filters:

Coalescing Media – Fiberglass, Polyester, Polypropylene, Nylon

Support Layers – Polyester, Polypropylene, Nylon

Internal Drain Mesh – Polypropylene

External Drain Sock – Polyester, Polypropylene

Hardware – Polypropylene + inox core, Tinned Steel, 304  or 316 Stainless Steel

Other alloys are available, consult factory


Buna-N, EPDM, Viton

Other options available, consult factory


Liquid-Liquid Coalescer Filters:

Disperses phase separation efficiency from 99% to 99.9%

Residual water ≤ 15 ppm even with fluids with extremely low IFT, interfacial tension (down to 0.5 dyne/cm)

Gas-Liquid Coalescer Filters:

Standard media: 99.98% aerosol ≥ 0.3 µm / 99.7% solids ≥ 0.3 µm

XA media: 99.994% aerosol ≥ 0.3 µm / 99.98% aerosol ≥ 0.1 µm / 99.98% solids ≥ 0.1 µm

Suitable for gas with liquids up to 1000 ppm (0.1%) without demister or vane extractor pre-separation

-See product cutsheets for additional product characteristics

Design Capabilities

Depending on your needs, Mott can provide just the filter elements, a vessel and elements, or provide you a full turnkey system with the vessel, frame, piping, instruments, and controls

Relevant Services

Destructive Element Analysis – Send us one of your elements for various analyses to determine the remaining lifetime and filtration efficiency of your filters.

Filter Feasibility Testing – Want a recommendation on the correct filter media, alloy, and backwash frequency for your process? Coordinate with a Mott representative to send a sample of your feed stock to our lab to determine the correct filtration design for your process.

Preventative Maintenance Cycles – Consult with a Mott representative about utilizing a pre-determined lab testing and cleaning schedule to avoid costly downtime.

Engineering Support – Utilize our expert project engineers to design the right filter elements to maximize flow and particle capture.