Liquid Liquid Separations

Immiscible liquids of any kind can be separated from water by flotation. The bubbles act to increase the kinetics of the naturally floating droplets such as diesel, crude oil, kerosene or the organics used in solvent-liquid extraction processes. Some examples are hydrocarbon separation from water on oil

Figure 6 Example of solid-solid separation: PAH from run-off water. Input of approximately 500 p.p.m. solids; filter feed of approximately 24% solids.
Figure 7 Treatment of oil platform process water; generalized circuit.

production platforms prior to final release of water, site run-off remediation and organics separation in hydrometallurgy. Columns are capable of removing freely floating hydrocarbons but usually not emulsified or dissolved hydrocarbons. In order to remove emulsified forms of hydrocarbons, a pre-aeration unit must be installed.

Oil production application Large amounts of water are involved in the extraction and production of oil. Column cells are used in the water treatment stage of production prior to release of the water back into the environment. In a typical circuit, as shown in Figure 7, water from the process is first passed through a cyclone or corrugated plate separator then to a column. The hydrocarbon concentrate from both of these vessels is returned for processing.

Site run-off remediation Sites that contain hydrocarbon contamination such as refineries and distribu tion depots often have run-off waters that contain entrained hydrocarbons. These can be treated effectively with flotation technology using a circuit containing a column either working on its own or in conjunction with a settling tank. If emulsified hydrocarbons are present, a pre-aeration unit may be required on the column in order to achieve contamination level under 15 p.p.m.

Organic-aqueous separation in solvent-liquid extraction circuits The solvent liquid extraction circuits employed in most hydrometallurgical processes require the removal of essentially all of an organic solvent from an aqueous medium in more than one stream. Initial separation is usually done in settlers. Columns with or without a pre-aeration unit can be used as secondary separation devices prior to filtering. The advantage of columns over many other devices is their ability to compensate for wide fluctuations in both aqueous and organic flows.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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