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Control methods for mineral oil mists.

David Leith¹, John Volckens, Maryanne G Boundy

¹Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.

Applied Occupational and Environmental Hygiene

|October 14, 2003

Summary

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Effective mist collection is crucial for plant air quality, but vapor repartitioning can increase oil-based metalworking fluid mist concentrations. Achieving very low mist levels is challenging due to this phenomenon.

Area of Science:

Industrial Hygiene
Environmental Chemistry
Aerosol Science

Background:

Oil-based metalworking fluids (MWFs) contain semivolatile hydrocarbons.
These hydrocarbons can partition between vapor and mist phases in plant air.
Mist collection is essential but doesn't solely determine air concentration.

Purpose of the Study:

To investigate the relationship between semivolatile hydrocarbon vapor and mist concentrations.
To apply atmospheric chemistry partitioning theory to MWF mists.
To understand the impact of vapor-to-mist repartitioning on air quality.

Main Methods:

Utilized partitioning theory from atmospheric chemistry.
Analyzed the behavior of semivolatile hydrocarbons in MWF mists.

Related Experiment Videos

Considered the role of mist collectors and plant ventilation.

Main Results:

Mist collectors effectively remove mist but not vapor.
Collector exhaust can lead to vapor repartitioning, increasing mist concentration.
Vapor-to-mist repartitioning is significant for many MWF compounds.

Conclusions:

Very low mist concentrations in plant air may be difficult to achieve.
Controlling vapor-to-mist repartitioning requires complex and potentially impractical solutions.
Understanding partitioning is key to managing MWF air quality.