| 摘要 |
PROBLEM TO BE SOLVED: To prevent contamination due to mixing of impurities from outside a container by mounting a gas permeable structure equipped with a filter on a large-sized container for marine-transportation of high purity hydrogen peroxide. SOLUTION: A gas permeable structure comprising a filter 1, filter presses 2, 3 and a vent hole 4 is placed higher than a liquid level of high purity hydrogen peroxide received in a large-sized container. Since the filter 1 is held by the filter presses 2, 3 from both sides, no leakage occurs from a pressed face between the filter and the filter presses. Thus since gas can flow out of or into the container via the filter 1, gas generation due to autolysis of hydrogen peroxide or generation of breakage or deformation of the container due to contraction of a gas layer part inside the container by a drop in an external temperature can be prevented. At this time, the maximum hole diameter of the filter 1 is made to be approximately 0.4μm or less, thereby preventing external contaminant from being mixed.
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