影响焦亚硫酸钠质量的几个因素

The Factors Impairing the Quality of Sodium Pyrosulfite

考察了影响焦亚硫酸钠质量的几项指标,发现以碳酸钠为原料合成焦亚硫酸钠时,原料中的铁、重金属几乎全部随焦亚硫酸钠析出,而氯化物只有少量析出。用对苯二胺作抗氧化剂可有效地降低硫酸盐的含量,用乙醇作为析出剂,使焦亚硫酸钠中亚硫酸钠含量增加。

The factors impairing the quality of sodium pyrosulfite have been investigated. In the process of preparing sodium pyrosulfite making use of sodium carbonate, The iron and heavy metal in the raw material were almost completely precipitated as sodium pyrosulfite, however the chloride was precipitated a little, the sulfate content of sodium pyrosulfite decreased by using antioxidant p-aminophenylamine, and the sodium sulfite content of sodium pyrosulfite increased in using alcohol for precipitation.