PROCESS FOR MAINTAINING A LOW SODIUM CHLORIDE CONTENT IN RECYCLED SODIUM CHEMICALS OF SODIUM-BASED PULP MANUFACTURING PROCESSES

摘要

16-204PROCESS FOR MAINTAINING A LOW SODIUM CHLORIDE CONTENTIN RECYCLED SODIUM CHEMICALS OF SODIUM-BED PULPMANUFACTURING PROCESSESABSTRACT OF THE DISCLOSUREprocess is provided for the separation of sodium chloride in thesodium chemicals recovery stage of sodium-based pulp manufacturingprocesses so as to maintain a low sodium chloride content in the recycledsodium chemicals, comprising the steps of treating an aqueous sodium chloride-containing solution with carbon dioxide gas, thereby forming a saturatedsodium bicarbonate solution; precipitating sodium values of the solution assodium bicarbonate while retaining sodium chloride in solution separatingsuch sodium bicarbonate; withdrawing the residual aqueous sodium chloride-containing solution from the process; and recycling the separated sodiumbicarbonate.