碳酸钠/甘油体系中六氯苯脱氯去除及影响因素研究

以六氯苯(HCB)为对象,以HCB脱氯和去除效率为考察指标,通过研究不同的氢供体、碱性物质、催化剂和反应温度等因素,逐步建立基于碳酸钠(Na2CO3)/甘油的高效碱催化脱氯(BCD)体系.结果表明,碱性物质的投加量对HCB的脱氯效率影响显著,当HCB、铁粉、Na2CO3和甘油的投加质量比为1:1:12:90时,在250℃下反应2.5h后,HCB的去除率达到99.9%,脱氯效率达到91.9%,部分氯苯已完全脱氯生成苯.研究结果证明了弱碱性物质也能高效催化HCB的脱氯降解.碳酸钠/甘油体系对HCB具有高效的脱氯效率,所用原料资源丰富、廉价,具有较好的应用前景.

Dechlorination and removal of hexachlorobenzene and influence factors in a sodium carbonate/glycerol system

Series of batch experiments were set up to evaluate the effects of hydrogen donors, bases, catalysts and temperature on the removal and dechlorination efficiencies (HRE and HDE) of hexachlorobenzene (HCB, as a case compound). The results indicated that the Na2CO3/glycerol system was an efficient BCD system for HCB. The amount of base significantly influenced the dechlorination efficiency of HCB in the Na2CO3/glycerol system. When the mass ratio of HCB: iron: Na2CO3: glycerol was 1:1:12:90, HRE and HDE were 99.9% and 91.9%, respectively. Some chlorobenzenes were completely dechlorinated to benzene and volatilized from the system. The research showed weak base could also effectively catalyze the removal and dechlorination of HCB, which was similar to strong base. Since the Na2CO3/glycerol system was efficient for the organochlorine compounds, like HCB, and reagents used were cheap and abundant could be a promising system for BCD application.