Development of A Thermal Regeneration Method of Organic Vapor Respirator Cartridges

有机蒸气呼吸器滤筒对极性和高挥发性化合物的穿透时间通常较短，因为它们对活性炭的吸附亲和力较弱。这种较低吸附亲和力的组分可以通过加热容易地解吸。研究了吸附单组分（甲醇、丙酮、异丙醇（IPA）、乙酸甲酯或甲乙酮）和双组分（IPA -甲苯或乙酸甲酯-甲苯）的呼吸器滤筒的热再生特性，并将其通入Shigematsu works，CA-104 NII呼吸器滤筒，得到穿透曲线。在检测到穿透后，将柱加热并通过连续供应空气获得解吸曲线。在解吸温度为65℃、空气流量为20 L/min的条件下，重复该吸附-解吸循环，考察了该循环对穿透时间的影响。对于单一组分，当解吸空气相对湿度较低时，再生吸附柱的穿透时间比新吸附柱的穿透时间短，当相对湿度大于50%（25℃时）时，无明显变化。在这两种情况下，重复吸附-解吸循环后，再生滤芯上的穿透时间无显著变化。在双组分混合物体系中，当较早的穿透组分（IPA或乙酸甲酯）超过穿透点时开始解吸。较早穿透组分的穿透时间随吸附-脱附循环次数的增加而减小，但当循环次数超过5次后，穿透时间基本不变。

The breakthrough time of organic vapor respirator cartridges for polar and high volatile compounds is generally short because of their weak adsorption affinity to activated charcoal. Such lower adsorption affinity component may easily desorb by heating. In this study, thermal regeneration characteristics of a respirator cartridge that adsorbed single component of vapor (methanol, acetone, isopropyl alcohol (IPA), methyl acetate or methyl ethyl ketone) and two-component vapors (IPA -toluene or methyl acetate -toluene) were investigated.The vapor introduced into a respirator cartridge (Shigematsu works, CA-104NII), and the breakthrough curve was obtained. After the breakthrough was detected, the cartridge was heated and the desorption curve was obtained by supplying air continuously. This adsorption-desorption cycle was repeated and the effect of the cycle on the breakthrough time was investigated under the desorption temperature was up to 65℃ and the air flow rate was 20 L/min.In a single component, the breakthrough time on a regenerated cartridge was shorter than that on a new one when the relative humidity of desorption air was low, but there was no significant change when the relative humidity was greater than 50% (values at 25℃). In both cases, there was no significant change in the breakthrough time on a regenerated cartridge after the adsorption-desorption cycle was repeated. In the two-component mixture system, desorption was started when the earlier breakthrough component (IPA or methyl acetate), exceeded the breakthrough point. The breakthrough time of the earlier breakthrough component tended to decrease with the increasing adsorption-desorption cycle but it became almost constant after the cycle was repeated more than 5 times.