Effectively Separates EmulsionsThe Pall PhaseSep® Y Series Coalescer is the latest member of the PhaseSep coalescer family and is a high efficiency separation cartridge that is constructed entirely of FDA listed polyolefin material. This allows the PhaseSep Y series coalescer to be used in a wide range of liquid/ liquid separations in the chemical, flavour & fragrance, and biotechnology industries where metal is not compatible and/or where FDA listed materials are required.
The coalescer media contains a three layered tapered pore construction. The emulsion first enters at the inside of the cartridge and passes through a coarse pre-filter layer to extend the service life. The fluid then encounters a fine media layer that initiates the coalescing process starting the enlargement of the droplets. The coalescing process is completed by a coarse media layer that maximizes the coalesced drop size before the fluid departs from the outside layer of the coalescer cartridge.
The presence of difficult to separate emulsions can be a costly problem in the chemical, flavour & fragrance, and biotechnology industries. Liquid contaminants can cause final products to be off-specification, deactivate expensive catalysts, foul contactor and stripping trays, lead to corrosion and delays in downstream storage tanks, and increase the costs for wastewater treatment.
Breaking stable emulsions can be a difficult task depending on the physical properties of the oil, water, and surfactant system.
Important parameters in determining the ease of separating emulsions are the interfacial tension (IFT), difference in density, and viscosity. The IFT is a good way to assess the stability of an emulsion and is a measure of how much energy is required to create additional water /oil surface area. For very stable emulsions, the IFT can be very low and conventional glass fibre coalescers can lose their efficiency when the IFT reaches below 20 dyne/cm.
Compatibility is also a key issue when selecting a coalescer type. Pall offers a wide range of coalescers including various polymers and fluoropolymers.
|All polyolefin construction||Wide chemical and low temperature compatibility||Better to withstand upsets in pH and temperature|
|Coalescense performance not impaired by presence of surfactants||Eliminates need for emulsion breaking chemicals|
|Tapered pore structure||Can separate liquids that have low interfacial tension||Excellent fluid quality|
|High void volume medium||Long service life||Enhanced protection of downstream equipment|
|FDA listed materials||Meets government regulations||Lower separation costs|
|Allows improved emulsion separation in flavour & fragrance/biotech industries|
The Pall pre-filter and horizontal liquid/liquid coalescer system is depicted on the last page. The first stage consists of a pre-filter housing that is used to remove solids from the inlet emulsion stream to protect the coalescer and ensure long service life. The pre-filter also functions as a pre-coalescer and starts the fine droplets in the emulsion on their route to forming larger intermediate drops that continue to enlarge in the coalescer medium.
In the coalescer housing, the liquid/liquid emulsion enters the PhaseSep Y series coalescing element and flows inside to outside. Dispersed phase droplets suspended in the continuous phase merge together in the fiber medium, or coalesce, as the emulsion moves through the coalescer medium.
The large coalesced droplets of the dispersed phase leave the coalescer cartridges and are separated by the difference in density between the two phases in the settling zone of the horizontal housing.
The drops collect in a sump where an interface level is monitored, typically with automated level control and valves. Depending on the difference in the density between the two phases, the sump can be located on the top or the bottom of the coalescer housing.
- Separation of oil from ammonia
- Separation of oil from urea
- Separation of oil from acid streams
- Separation of oil from caustic streams
- Separation of citric oils from alcohol-water
- Separation of organics from acid/caustic pharmaceutical extractants
- Remove liquid contamination to a level of ≤5 ppmw based on gravimetric analysis
- Handle inlet dispersed liquid contaminant concentrations as high as 10%
- Separate emulsions with interfacial tensions as low as 0.5 dyne/cm
Note: each application for the PhaseSep Y Series L/L Coalescer should be reviewed by Pall Corporation for technical feasibility.
CompatibilityThe PhaseSep Y series coalescer is compatible with many corrosive solvents encountered in the chemical, flavour & fragrance, and biotechnology industries including ammonia, urea, acids, caustics, brines, amines, alcohols, and many other organic solvents. For compatibility information with a specific chemical, please contact your local Pall office.
Performance Claims and Specifications
|Maximum Temperature:||122 °F (50 °C)|
|Minimum Temperature:||-40 °F (-40 °C)|
|Initial Pressure Drop:||2 psid (0.14 bar)|
|Recommended Changeout:||15 psid (1.03 bar)|
|Burst Pressure Drop:||50 psid (3.5 bar)|
Ordering Information - Coalescer
|Part Number||Description||Nominal Diameter||Nominal Length*|
|23⁄4in. (70 mm)||20 in. (510 mm)|
* Stackable for extended lengths
Ordering Information - Housing
|Part Number||No. Coalescer||Rated Flow per Housing||Nominal Housing Diameter||Inlet/Outlet Flange Diameter|
|3HAQLS0501F - - - 1||3||16/60||5/127||1/25.4|
|8HAQLS1202F - - - 1||8||42/160||12/305||2/50.8|
|15HAQLS2002F - - - 1||15||80/300||20/508||2/50.8|
|35HAQLS2804F - - - 1||35||185/700||28/711||4/101.6|
|Code||ASME B16.5 Flanges|
|None||Carbon Steel Vessel, 304 Stainless Steel Tube Sheet|
|S3||304L Stainless Steel|
|S8||304 Stainless Steel|
|L3||316L Stainless Steel|
|L8||316 Stainless Steel|
|Code||Pressure Rating for Carbon Steel Vessels|
|285||285 psig (19.7 barg)|
|740||740 psig (51.0 barg)|