Scahill John, Wolfrum Edward J, Michener William E, Bergmann Michael, Blake Daniel M, Watt Andrew S
National Renewable Energy Laboratory, Golden, Colorado 80401, USA.
J Air Waste Manag Assoc. 2004 Jan;54(1):105-10. doi: 10.1080/10473289.2004.10470879.
The use of sorbents has been proposed to remove volatile organic compounds (VOCs) present in ambient air at concentrations in the parts-per-billion (ppb) range, which is typical of indoor air quality applications. Sorbent materials, such as granular activated carbon and molecular sieves, are used to remove VOCs from gas streams in industrial applications, where VOC concentrations are typically in the parts-per-million range. A method for evaluating the VOC removal performance of sorbent materials using toluene concentrations in the ppb range is described. Breakthrough times for toluene at concentrations from 2 to 7500 ppb are presented for a hydrophobic molecular sieve at 25%) relative humidity. By increasing the ratio of challenge gas flow rate to the mass of the sorbent bed and decreasing both the mass of sorbent in the bed and the sorbent particle size, this method reduces the required experimental times by a factor of up to several hundred compared with the proposed American Society of Heating, Refrigerating, and Air-Conditioning Engineers method, ASHRAE 145P, making sorbent performance evaluation for ppb-range VOC removal more convenient. The method can be applied to screen sorbent materials for application in the removal of VOCs from indoor air.
有人提出使用吸附剂来去除环境空气中存在的挥发性有机化合物（VOCs），其浓度处于十亿分之一（ppb）范围，这在室内空气质量应用中很典型。吸附剂材料，如颗粒活性炭和分子筛，在工业应用中用于从气流中去除VOCs，在这些应用中VOC浓度通常处于百万分之一范围。本文描述了一种使用ppb范围内甲苯浓度评估吸附剂材料去除VOC性能的方法。给出了在25%相对湿度下，疏水性分子筛对浓度为2至7500 ppb的甲苯的穿透时间。通过提高挑战气体流速与吸附剂床层质量的比率，并降低床层中吸附剂的质量和吸附剂颗粒尺寸，与美国供热、制冷与空调工程师协会提出的方法ASHRAE 145P相比，该方法将所需实验时间减少了多达数百倍，使得对ppb范围内VOC去除的吸附剂性能评估更加便捷。该方法可用于筛选吸附剂材料，以应用于从室内空气中去除VOCs。
