Gas Desorption from Chemical Cartridges
Yuki
Nakata, Norikazu Kurano and Meguru Inai
Shigematsu Works Co., Ltd.
267 Yashita, Iwatsuki, Saitama
339-0046,
Tel:
048-757-2611 Fax: 048-756-7969
e-mail: y-nakata@sts-japan.com.
It is known that the sorbent
like activated carbon desorb gases which are adsorbed
physically. In order to find how the
phenomenon affects chemical cartridges for gas respirators, we carried out the
following tests on organic vapor cartridges.
TEST-A: Assuming that a gas respirator wearer
comes into a workplace with toxic gas and out to a resting place with clean air
by turns, we investigated the breakthrough time and desorption
of gases from organic vapor cartridges through which challenge gas such as Cyclohexane, Dichlorometane at
300ppm and clean air passed by turns.
TEST-B:
Assuming that the
organic vapor cartridges once stored would be re-used, we prepared the organic
vapor cartridges which were passed the organic vapor then stored in the laboratory for a certain period. The desorption
of the gas from the cartridges was investigated by passing clean air.
We obtained the result from TEST-A
that the breakthrough time of the cartridges passed challenge gas and clean air
by turns becomes shorter than the case of continuous challenge gas passing.
We obtained the result from TEST-B
that desorption might possibly occur by passing clean
air depending on both conditions of challenge gas and storage.
Based on the test results, we will
discuss on the management of gas respirators which are used repeatedly or after
storage.