吸收法高效处理含苯系物废气的工艺研究

Process Study on Efficient Treatment of Benzene-Containing Waste Gas by Absorption Method

摘要: 热风工艺拆解印刷线路板上电子元器件过程中会释放多种苯系化合物，选用甲苯作为典型污染物，开发吸收法高效去除VOCs的工艺，以三种化学试剂水溶液作为高效吸收液的遴选目标，包括Tween-20水溶液，Tween-80水溶液及柠檬酸钠水溶液，考察了三种吸收液的吸收率及成本，发现0.3% Tween-80浓度的吸收液对甲苯的平均吸收率为91.30%，1.0% Tween-20浓度的吸收液的平均吸收率为95.47%，0.3% Tween-80吸收液成本比1.0% Tween-20吸收液低约80%，柠檬酸钠吸收液的平均吸收率为92.73%，成本约为Tween-80吸收液的3倍，表明Tween-80可作为较理想的高效吸收甲苯挥发物吸收液的有效组分。

Abstract: The process of dismantling electronic components on printed circuit boards by hot air process will release a variety of benzene compounds. In this paper, toluene was selected as a typical pollutant to develop an efficient volatile organic compounds (VOCs) removal process by absorption method. The absorption rate and cost of the three chemical reagent aqueous solutions were investigated as the selection target (including Tween-20 aqueous solution, Tween-80 aqueous solution and sodium citrate aqueous solution) for the efficient absorbent solution, and it was found that the average absorption rate of toluene was 91.30% for the absorbent solution with 0.3% Tween-80 concentration, 95.47% for the absorbent solution with 1% Tween-20 concentration, and the cost of 0.3% Tween-80 absorbent solution was about 80% lower than that of 1% Tween-20 absorbent solution. The average absorption rate of sodium citrate absorbent was 92.73%, and the cost was about three times of that of Tween-80 absorbent. It showed that Tween-80 can be used as an effective component of a more ideal and efficient absorbent for toluene volatiles.