FOERFARANDE FOER AVLAEGSNANDE AV SODIUM CHLORIDE FRAON KEMIKALIEAOTERVINNINGSSYSTEMET AV SULFATCELLULOSAKOK

摘要

A process of removing sodium chloride which has accumulated in the precipitator catch of the kraft pulping process chemical recovery systems without undue loss of sodium sulfate and other useful chemicals. The process basically comprises leaching precipitator catch, which contains sodium sulfate, sodium carbonate, sodium chloride and organic material, with sufficient aqueous sulfuric acid solution to produce a leached slurry of pH 3-6, thereby converting sodium carbonate to sodium sulfate and recovering sodium chloride.