This Roche facility in Belvidere was involved in the pilot manufacture of innovative Vitamin C products. One step in the manufacturing process utilized a vacuum belt filter operation which created undesir- able vapor by-products. These corrosive vapors were collected and removed via vent lines to be ab- sorbed using a carbon bed process (scrubbed). The vapors involved were HCL, chloroform and alcohol. Although the concentrations were u

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