Abstract
Chemical tankers in Japan transport various kinds and large amount of chemical substances. Some of them have adverse effects to the human health condition. However emissions of cargoes to environment occur during tank cleaning operation that is conducted to avoid contamination with next cargo. The emission amount during tank cleaning operation corresponds to the residue amount in cargo tanks after unloading operation. Thus, to evaluate the pollution level caused from chemical tanker activities, it is necessary to estimate the residue amount after unloading. We built up a calculation model to estimate the gas residue amount in cargo tank after unloading operation. Combining with results by a calculation model estimating liquid residue amount, emission amount of benzene, recognized as human carcinogen, is estimated under various temperature conditions.
