BFR(TM) - A NEW PROCESS TOWARD BLEACH PLANT CLOSURE

A technical and economic assessment of the feasibility of recovering c hloride-containing bleach filtrates in a conventional kraft recovery s ystem has been completed. This investigation has led to the developmen t of a process for recovering filtrates from the bleach plant. The pro cess is applicable for both hardwoods and softwoods. Filtrates from th e bleach plant are used for brownstock washing and are thereby recover ed in the conventional recovery cycle. A process was developed to remo ve chloride from the mill liquor cycle. Computer simulations predict t hat the chloride concentration in the mill liquor cycle can be maintai ned at concentrations typical of inland mills. The process for removin g chloride also removes potassium compounds.