Development of A Thermal Regeneration Method of Organic Vapor Respirator Cartridges

由于有机蒸汽口罩对活性炭的吸附亲和力较弱，其对极性和高挥发性化合物的突破时间一般较短。这种较低的吸附亲和成分很容易通过加热解吸。本研究研究了单组分蒸汽（甲醇、丙酮、异丙醇（IPA）、醋酸甲酯或甲基乙基酮）和双组分蒸汽（IPA -甲苯或醋酸甲酯-甲苯）对呼吸器保护套的热再生特性。将蒸汽引入呼吸器筒（Shigematsu works, CA-104NII），得到了突破曲线。检测到突破后，对滤筒进行加热，连续送风得到解吸曲线。在解吸温度为65℃，空气流量为20 L/min的条件下，重复进行吸附-解吸循环，考察循环对突破时间的影响。在单一组分中，当解吸空气相对湿度较低时，再生筒体的突破时间比新筒体短，但当相对湿度大于50%（25℃）时，这一变化不显著。在这两种情况下，重复吸附-解吸循环后，再生药筒上的突破时间没有显著变化。在双组分混合体系中，当较早的突破组分（异丙酸或乙酸甲酯）超过突破点时，开始解吸。随着吸附-解吸循环次数的增加，早期突破组分的突破时间有减小的趋势，但循环次数超过5次后基本保持不变。

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.