Yoon Y H, Nelson J H, Lara J, Kamel C, Fregeau D
DataChem Laboratories, Salt Lake City, UT 84123.
Am Ind Hyg Assoc J. 1992 Aug;53(8):493-502. doi: 10.1080/15298669291360021.
A theoretical model, developed previously to assess respirator cartridge service life, was applied to various acetone/styrene binary assault systems. Experimental data, collected for several binary mixtures differing only with respect to the concentration of each of the two compounds, were interpreted in terms of the model. Styrene concentrations varied from 228 to 1578 ppm; the range of acetone concentrations was 92-985 ppm. The specific influence of the compound assault concentrations on respirator cartridge service life was carefully characterized, as break-through curves were generated for both acetone and styrene for each of several different binary systems. Specifically, experimental data for each system were used to determine values of the following theoretical parameters: k'1, tau 1, k'2, tau 2, and Am. These parameters were employed with the theory to generate complete theoretical breakthrough curves and to determine the time-dependence of the weight of each compound adsorbed by the respirator cartridge carbon bed. An interesting phenomenon observed for the acetone/styrene systems was the displacement (from the carbon) of previously adsorbed acetone molecules by styrene molecules. Acetone breakthrough was observed first in each of the systems studied. Following the onset of this breakthrough, the acetone breakthrough concentration was enhanced by the displacement of acetone from the carbon bed by the adsorption of styrene. The theoretical model accurately predicts both this enhancement and the associated breakthrough characteristics of styrene. In addition, the theory is capable of predicting the ratio of the number of displaced acetone molecules to the corresponding number of displacing styrene molecules. For these studies, this ratio ranged from 0.3 to 0.7. The service life of respirator cartridges exposed to acetone/styrene mixtures depends on the assault concentration of each compound and is significantly influenced (shortened) by the displacement phenomenon.
先前开发的用于评估呼吸器滤毒罐使用寿命的理论模型，被应用于各种丙酮/苯乙烯二元攻击系统。针对几种仅在两种化合物各自浓度上有所不同的二元混合物收集的实验数据，依据该模型进行了解释。苯乙烯浓度在228至1578 ppm之间变化；丙酮浓度范围为92 - 985 ppm。仔细表征了化合物攻击浓度对呼吸器滤毒罐使用寿命的具体影响，因为针对几种不同的二元系统分别生成了丙酮和苯乙烯的穿透曲线。具体而言，每个系统的实验数据用于确定以下理论参数的值：k'1、τ1、k'2、τ2和Am。这些参数与该理论一起用于生成完整的理论穿透曲线，并确定呼吸器滤毒罐碳床吸附的每种化合物重量的时间依赖性。在丙酮/苯乙烯系统中观察到一个有趣的现象，即先前吸附的丙酮分子被苯乙烯分子从碳上置换下来。在所研究的每个系统中，首先观察到丙酮穿透。在这种穿透开始后，由于苯乙烯的吸附使丙酮从碳床中被置换，丙酮穿透浓度增加。该理论模型准确地预测了这种增加以及苯乙烯相关的穿透特性。此外，该理论能够预测被置换的丙酮分子数量与相应的置换苯乙烯分子数量之比。对于这些研究，该比例在0.3至0.7之间。暴露于丙酮/苯乙烯混合物中的呼吸器滤毒罐的使用寿命取决于每种化合物的攻击浓度，并受到置换现象的显著影响（缩短）。
