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==Separating Emulsion== | ==Separating Emulsion== | ||
When one liquid is dispersed in a continuous liquid phase of a different composition an emulsion is formed. The type of emulsions formed depends on the kind of liquid which forms the the continuous phase and thus we have: (1) Oil-in-water (O/W) when oil is dispersed in water; (2) water-in-oil (W/O) when water is dispersed in oil. | |||
==Basic steps involved in Separating Emulsion== | ==Basic steps involved in Separating Emulsion== | ||
===Destabilization=== | ===Destabilization=== | ||
Counteracting the stabilizing effect of the emulsifier destabilizes an emulsion. To increase the probability of coalescence of dispersed water droplets on contact, the tough skin or film surrounding the dispersed water droplets must be weakened and broken. The following methods can be applied | |||
# Adding heat to the emulsion | |||
# Adding active chemicals compounds that are designed to the break the emulsion | |||
# Applying electrical fields that promote coalescence | |||
# Applying microwave radiation to break the emulsion | |||
===Coalescence=== | ===Coalescence=== | ||
After the skin that surrounding the dispersed droplets is been sufficiently weakened, the droplets must flocculate into drops that are large enough to settle out of the continuous liquid phase. The emulsion droplets aggregating together to form larger units/flocs is called coalescence. | |||
===Gravity separation=== | ===Gravity separation=== | ||
Next, there must be a quiet period of settling to allow the coalesced drops to settle out of the oil by gravity. This requires a sufficient residence time and a favorable flow pattern in a tank or vessel that will allow the coalesced drops of water to separate from the oil. Sedimentation is the separation of suspended material from the water by gravity. Sedimentation is carried out in a sedimentation tank, a settling tank, or clarifier-- different words for the same process. | |||
== Application of Separating Emulsion == | |||
Separating two immiscible liquids (emulsion) can have a variety of applications: | |||
==References== | ==References== | ||
N. Saifuddin and K.H. Chua , 2006. Treatment of Oily Waste Water Emulsions from Metallurgical Industries Using Microwave Irradiation. ''Biotechnology, 5: 308-314.'' | |||
Revision as of 04:45, 29 October 2021
Separating Emulsion
When one liquid is dispersed in a continuous liquid phase of a different composition an emulsion is formed. The type of emulsions formed depends on the kind of liquid which forms the the continuous phase and thus we have: (1) Oil-in-water (O/W) when oil is dispersed in water; (2) water-in-oil (W/O) when water is dispersed in oil.
Basic steps involved in Separating Emulsion
Destabilization
Counteracting the stabilizing effect of the emulsifier destabilizes an emulsion. To increase the probability of coalescence of dispersed water droplets on contact, the tough skin or film surrounding the dispersed water droplets must be weakened and broken. The following methods can be applied
- Adding heat to the emulsion
- Adding active chemicals compounds that are designed to the break the emulsion
- Applying electrical fields that promote coalescence
- Applying microwave radiation to break the emulsion
Coalescence
After the skin that surrounding the dispersed droplets is been sufficiently weakened, the droplets must flocculate into drops that are large enough to settle out of the continuous liquid phase. The emulsion droplets aggregating together to form larger units/flocs is called coalescence.
Gravity separation
Next, there must be a quiet period of settling to allow the coalesced drops to settle out of the oil by gravity. This requires a sufficient residence time and a favorable flow pattern in a tank or vessel that will allow the coalesced drops of water to separate from the oil. Sedimentation is the separation of suspended material from the water by gravity. Sedimentation is carried out in a sedimentation tank, a settling tank, or clarifier-- different words for the same process.
Application of Separating Emulsion
Separating two immiscible liquids (emulsion) can have a variety of applications:
References
N. Saifuddin and K.H. Chua , 2006. Treatment of Oily Waste Water Emulsions from Metallurgical Industries Using Microwave Irradiation. Biotechnology, 5: 308-314.