草浆漂白过程中二噁英类生成机理探讨

FORMATION MECHANISMS OF DIOXINS DURING HYPOCHLORITE BLEACHING OR CHLORINATION OF NON-WOOD PLANT FIBERS PULP

本文以氯苯、氯酚、二苯并二噁英（DBD）和二苯并呋喃（DBF）为PCDD/Fs前生体,模拟工业草浆漂白条件,探讨了次氯酸盐和氯气漂白苇浆过程中二噁英类的生成机制,研究表明,在苇浆中加入二噁英类前生体如DBD/F,其氯化产物与在木浆中有所区别,在实验条件下,二噁英类的生成量分别为:15μg PCDDs·mg^（-1）DBD。1.5μg PCDFs·mg^（-1）DBF。

Experiments have been conducted to help establish the source of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) that are produced during hypochlorite bleaching or chlorina-tion of non-wood plant fibers pulp. The role of chlorobenzenes ( CBs), chlorophenols (CPs ) , dibenzo-p-dioxin (DBD) and dibenzofurans (DBF) as dioxins precursors were investigated. It was shown that CBs and CPs are not significant in the formation of dioxins. Some of evidences suggest that there are different formation mechanisms between DBD/F spiked wood fiber and non-wood plant fibers.