DE DEHY HYDR DRA ATION TION OF OF BI BIOK OKE EM M
An alternative technology to vacuum dehydration is dehydration by air stripping (Figure 4), a process that removes water as well as gaseous contaminants in the oil.
Not only does it remove free and emulsified water, but also dissolved water down to less than 100 ppm.
Because of its ability to degas, it is also suitable for removing hydrocarbons in seal oil systems.
Air stripping works by drawing air or nitrogen gas into a stream of heated oil, which mixes in and absorbs the water and gasses within the oil. The oil/air is then expanded to release the air or nitrogen, which takes the impurities with it.
Generally, the water removed will be of a reasonable quality, sufficient to allow it to be drained off in the normal network without special disposal requirements.
The exhaust air and gasses are also controlled to minimize the oil vapour released.
Just like vacuum dehydrators, cost is an issue with air stripping. However, its advantage is that it costs less to maintain than a typical vacuum dehydrator because it has fewer moving parts.
The fact that it can also remove other gaseous impurities, as well as dissolved water, makes air stripping technology an effective alternative to vacuum dehydration.
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