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

摘要

16-204 PROCESS FOR MAINTAINING A LOW SODIUM CHLORIDE CONTENT IN RECYCLED SODIUM CHEMICALS OF SODIUM-BED PULP MANUFACTURING PROCESSES process is provided for the separation of sodium chloride in the sodium chemicals recovery stage of sodium-based pulp manufacturing processes so as to maintain a low sodium chloride content in the recycled sodium chemicals, comprising the steps of treating an aqueous sodium chloridecontaining solution with carbon dioxide gas, thereby forming a saturated sodium bicarbonate solution; precipitating sodium values of the solution as sodium bicarbonate while retaining sodium chloride in solution separating such sodium bicarbonate; withdrawing the residual aqueous sodium chloridecontaining solution from the process; and recycling the separated sodium bicarbonate.