几种有机废气吸收液对甲苯吸收效果的对比

采用自行设计的吸收装置,对比研究了国内外文献报道的几种有机废气吸收液(二乙基羟胺、聚乙二醇400、硅油、食用油、废机油、0#柴油)对模拟甲苯废气的吸收效果。结果表明,通过改变吸收液种类、废气中甲苯浓度等条件能够对甲苯废气吸收效果产生显著影响。随着吸收时间的延长,吸收液对甲苯的吸收率逐渐降低,直至达到动态饱和。随甲苯废气中甲苯浓度的增大,吸收液的有效吸收量减小,而饱和吸收量则增大。在相同实验条件下,二乙基羟胺对甲苯的有效吸收量与饱和吸收量均最大,其次是食用油、机油、0#柴油,而聚乙二醇与硅油吸收效果最差。本研究结果为合理选择甲苯废气的高效吸收液提供了理论依据。

A comparison study of toluene absorption capability by several kinds of organic solvents

A comparison study of absorption capability of several types of organic solvent: di(2-ethylhexyl) adipate (DEHA), polyethylene 400 (PEG400), polydimethyl siloxane (PDMS), vegetable oil, waste lubricant oil, 0^# diesel was conducted using a self-designed absorption device. The results show that changing of the types of solvents or toluene concentration in the waste gases can obviously influence the toluene absorption capability. The toluene absorptive efficiency of the organic solvents will decrease with increasing absorption duration, up to a dynamic saturation. With increasing toluene concentration of the inlet gas, the effective absorption amount of an organic solvent to toluene will decrease, but its saturated absorption amount will increase. Under the same experimental conditions, DEHA shows the biggest toluene absorption capability, followed by vegetable oil, waste lubricant oil and 0# diesel, and PEG400 and PDMS are the worst absorption solvents to toluene. The present result provides a theoretical basis to select a high performance absorption liquid of toluene waste gases for engineering design.