Condensing filter

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Coalescing Technology for Liquid/Liquid Separations Liquid/liquid separations, along with solids removal, are crucial to the success of the biodiesel production process. The efficiency of separation significantly influences the quality and overall economics of production. By Maria Anez-Lingerfelt When making biodiesel, inefficient separation of glycerol and water can lead to off-spec product, increasing production costs and delays. The choice of separation equipment is influenced by factors such as quality needed, flow rate and solids contamination. Economics also plays a significant role considering initial capital costs, operating costs, waste disposal costs and maintenance. It’s important to conduct a thorough process review to fully understand which type of separation technology to use, and the best location for it. Traditional and present separation technologies used in biodiesel production include gravitational and centrifugal equipment, along with low-efficiency coalescers. Pall’s trademarked PhaseSep AS coalescers were developed for liquid/liquid separations in biodiesel processing, and require low energy and cost inputs, and are highly efficient. Pall’s liquid/liquid coalescing technology consists of solids filtration, coalescence and separation (Figure 1). The first step is to remove the solid contaminants using a cartridge filter. Figure 1. Pall’s Liquid/Liquid Coalescing Technology Solids can increase the stability of an emulsion and can plug the coalescer, thereby reducing its efficiency. Removing solids will precondition the fluid for optimum coalescer performance. During coalescence, the droplets to be separated from the bulk fluid are captured by the coalescer medium. The droplets then move through the coalescer media (with progressively larger pores) and are coalesced to form larger droplets. Lastly, the large droplets are released. After the droplets are released from the media, the phases are separated by gravity in the settling zone. Pall’s PhaseSep AS liquid/liquid coalescer system consists of a coalescer element in a horizontal configuration followed by a settling zone for separation (Figure 2). A prefilter cartridge is placed upstream of the coalescer to remove the solid contaminants. The flow is radial from inside to outside. After settling, the lighter phase e*ts the top and the heavier phase e*ts the bottom. Figure 2. Pall’s PhaseSep® AS liquid/liquid coalescer system Important Factors in Liquid/Liquid Separation Interfacial tension (IFT), viscosity, density and temperature are four important factors in liquid/liquid separation. Interfacial tension is a measure of the attraction force among each phase for its own species in units of dynes per centimeter (dynes/cm). If the IFT between two liquid phases is high (>20 dynes/cm), they can be separated easily. If the IFT is low (

The condensing filter integrates three processes: centrifugal separation, coarse filtration, and fine filtration, and it is capable of effectively removing impurities such as dust, moisture, and oil mist from compressed gas. It operates on the principles of inertial diffusion and gravitational sedimentation~~