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Industries
Industrial Manufacturing
Industries
Oil & Gas
Filter Media
Polyester
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DFT Classic®, Filter Cartridges, Removal Rating 10 μm, Polyester, Length 40 Inches
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The inability to efficiently separate liquid/liquid emulsions can be a very costly problem in the oil, gas, and chemical industries. Liquid contamination can cause final products to be off-specification, rapid deactivation of downstream catalysts, corrosion of downstream storage facilities, and increased costs for wastewater treatment.
Separating liquid/liquid dispersions can be difficult depending on the physical properties of the two liquid phases. The specific gravity, viscosity, and interfacial tension (IFT) of the two liquid phases are important parameters in determining how easy two liquids can be separated.
Pall’s PhaseSep® coalescer is available in several types of high efficiency coalescing medium which ensures that a Pall coalescer can be specified for virtually any liquid/liquid separation application in the oil, gas and chemical industries.
Industries
Industrial Manufacturing
Industries
Oil & Gas
Filter Media
Polyester
The inability to efficiently separate liquid/liquid emulsions can be a very costly problem in the oil, gas, and chemical industries. Liquid contamination can cause final products to be off-specification, rapid deactivation of downstream catalysts, corrosion of downstream storage facilities, and increased costs for wastewater treatment.
Separating liquid/liquid dispersions can be difficult depending on the physical properties of the two liquid phases. The specific gravity, viscosity, and interfacial tension (IFT) of the two liquid phases are important parameters in determining how easy two liquids can be separated. Conventional coalescers begin to lose efficiency when the IFT gets below 20 dyne/cm. In addition, efficient separation is a function of the compatibility of the liquids with the coalescer medium. A good coalescing medium is not necessarily compatible with the liquids and a compatible medium is not necessarily a good coalescing medium.
Pall’s PhaseSep® coalescer is available in several types of high efficiency coalescing medium which ensures that a Pall coalescer can be specified for virtually any liquid/liquid separation application in the oil, gas and chemical industries.
A Pall PhaseSep system is available in two different configurations. Both configurations begin with a filtration stage to remove solid contaminants.
Prefiltration
Due to the fine pore structure of the coalescer medium, Pall recommends that a prefilter be installed upstream of the coalescer assembly. Removal of solids performs the following important functions:
Two different housing configurations are available for PhaseSep coalescers. Table 1 provides guidelines for selection.
Table 1: Coalescer Selection Guide
Process Condition | Recommended Product |
---|---|
Dispersed phase fluid is aqueous IFT > 3 dyne/cm | PhaseSep coalescer/separator stack in a vertical housing |
Dispersed phase fluid is aqueous IFT < 3 dyne/cm | PhaseSep coalescer without separator in a horizontal housing |
Both fluids are non-aqueous | PhaseSep coalescer without separator |
Dispersed phase fluid is oil, continuous phase fluid is aqueous | PhaseSep coalescer in a horizontal housing without separator |
Benefits
Features
Products in this datasheet may be covered by one or more patents, including EP 930,926; US 5,480,547; US 6,332,987.
Typical Applications for PhaseSep Coalescers
The Pall PhaseSep system is a multiple stage system starting with filtration to remove particulate matter*, followed by either a one-stage or two-stage coalescer stack to separate the two liquid phases. PhaseSep coalescers will remove a liquid contaminant to a level of 15 ppmv and below over a wide range of conditions such as:
Pall PhaseSep Coalescer/Separator Stack-Vertical Housing Setup
Pall’s PhaseSep coalescer/separator stack should be used when the contaminant is an aqueous liquid such as water, caustic, or an amine solution and when the IFT is greater than 3.0 dyne/cm. (see Figure 1). Using Pall’s coalescer/ separator stack in Pall’s unique vertical housing design is the most efficient technique for separating two liquids meeting the above criteria. The liquid/liquid mixture enters the coalescing element and flows inside to outside. This is where small liquid droplets suspended in the continuous phase come together, or coalesce, as the mixture moves through Pall’s proprietary coalescer medium.
Contaminant-free liquid and large droplets of the dispersed phase flow toward the separator located directly below the coalescer stage. The flow is outside to inside. The separator medium is hydrophobic preventing the aqueous phase from entering the separator. Only the non-aqueous continuous phase fluid flows through the separator. The two liquids are removed by separate drain connections.
Figure 1: PhaseSep Liquid/Liquid Separation System with an Integrated Coalescer/Separator Stack in a Vertical Housing with a Prefilter
Pall PhaseSep Coalescer-Horizontal Housing Setup
In general, a PhaseSep coalescer without a separator is placed in a horizontal housing (see Figure 2). Pall’s PhaseSep coalescer should be used in applications to separate nonaqueous liquid contaminants such as removing oil from water or separating two non-aqueous liquids. In addition, for liquids with ultra-low IFTs (less than 3.0 dyne/cm.), a PhaseSep coalescer installed in a horizontal housing will provide maximum liquid/liquid separation efficiency.
In a horizontal housing, the liquid/liquid mixture enters the coalescing element and flows inside to outside. As is the case with the coalescer/separator stack, small liquid dispersed phase droplets suspended in the continuous phase come together, or coalesce, as the mixture moves through the PhaseSep coalescer. The large coalesced droplets of the dispersed phase separate by gravity in the horizontal housing and are removed. The size of the housing is a function of the IFT, viscosity, and specific gravity of the liquids.
Figure 2: PhaseSep Liquid/Liquid Separation System with Coalescer in a Horizontal Housing with a Prefilter.
Performance Claims and Specifications
Maximum Operating Temperature: | 149°C/300°F |
Initial Pressure Drop: | 0.138 bard/2 psid |
Recommended Changeout: | 1.033 bard/15 psid |
Coalescers
Table 1
Code | Hardware |
---|---|
S | 304 stainless steel |
X | Hastelloy (for special compatibility issues) |
Table 2
Code | Cartridge length (cm/ in) |
---|---|
06 | 15.24 /6 |
2 | 50.8 /20 |
4 | 101.6 /40 |
Table 3
Code | Internal Use only |
---|---|
1 or 2 |
Table 4
Code | End cap material |
---|---|
A | 304 stainless steel |
H | Polycapped fluoropolymer |
Table 5
Code | O-rings |
---|---|
H | Fluoropolymer |
H1 | Teflon encapsulated fluoropolymer |