ARC® (Amine Recoverable Concentrate) Recycling for the Phenolic Urethane Cold Box Process
Foundries that utilize the Phenolic-Urethane Cold-Box process are required to capture and contain amine gases used in the curing process. Utilizing the ARC® Program, Triethylamine (TEA), Dimethylethylamine (DMEA), Dimethylpropylamine (DMPA) and Dimethylisopropylamine (DMIPA) can all be contained for recycling. The actual containment or "capturing" of the amine after the cores/molds are cured is done through the use of a chemical scrubber. The packed tower scrubber utilizes a sulfuric acid solution to concentrate the free amine into amine salts which prevents the amine from escaping back into the atmosphere. As the amine enters the scrubber and contacts the water-acid concentration, a reaction takes place between the components to form sulfates within the scrubber solution. Over time the sulfuric acid solution in the scrubber becomes saturated with amine salts and needs to be replaced.
Amine sulfate scrubber solutions can be sent to Novis Works’ partner facility. Here the scrubber solution will be put through a process that will liberate the amine out of solution allowing for capture. The reclaimed amine is chemically identical to freshly produced amines. The recycled amine is repackaged and resold to the foundry industry.
Benefits of recovering amine through the ARC® Program include, minimize the foundry’s environmental impact, elimination of a waste stream, VOC credits and cost reductions
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