Abstract
During the last several decades, the automotive coating industry has faced air pollutioncontrol problems arising from their daily operations. Emissions from surface coatingoperations include volatile organic compounds (VOCs), several inorganic pollutants andparticulate matter. The limit of VOCs emissions established by the European Union forautomotive coating industry is 60 g/n/. No threshold limits are established in Brazil for thisparticular industrial branch. Using the material balance approach, an estimate of the VOCsfrom automotive surface coating operations that uses solvent-base and water-base coatingswas perfom1ed. Based on consumption and composition of raw materials; area of paintedsurfaces; and amount of emissions captured in vapor and liquid phases; it was possible toestimate the VOCs concentrations emitted by unit of painted surface area. The accuracy ofthis mass balance approach was estimated by comparing results from lab tests of VOCsamples collected in three different emissions points before treatment.
Highlights
Volatile Organic Compounds (VOCs) are emitted from different types of sources
This study applies a material balance approach to estimate volatile organic compounds (VOCs) emissions from an automotive painting plant, The percentage of VOCs solvent in the coating, given in the Material Safety Data Sheet (MSDS), multiplied by the quantity of coating used yields the total emissions from the coating, Solvents used for cleaning are inputs in the process, The mass of solvent captured in vapor phase was given by air samples collected before treatment and analyzed in lab
Where VE is grams of VOC per area painted (g/m2 J; VCn, volume of raw material per month (L/months); VOCn, VOCs concentration in each raw material; Solvn, mass of solvent used per month; RSA, mass of solvent captured in vapor phase; RSs. mass of solvent captured in liquid phase; B, vehicle bodies painted per month; and S, vehicle body area painted (m2 vehicle)
Summary
Volatile Organic Compounds (VOCs) are emitted from different types of sources. Surface coating operations, such as painting, are common sources of VOCs emissions. The amounts and types of VOCs emitted from any process depend greatly on the type of paint, process and the configuration and rate of air flow through the paint booth and dry oven. Automotive coating raises relevant environmental issues such as VOCs emissions, global wam1ing and waste generation. Coatings consist of solids (e.g. resin, pigments, extenders, additives) and solvents. The air emissions come from the evaporation of organic solvents. They consist primarily of VOCs, such as toluene, xylene, ethyl acetate, and n-butyl acetate [I)
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