Characteristics and Applications of Dry-ice as Refrigerant for Sample Preservation and Efficiency of the Thermal Insulation Containers.
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概要
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Dry-ice has higher heat absorption capacity by 1.5-2.5 times than others among common refrigerants and is versatile to use for sample preservation in cooling condition because of its changing phase from solid at the beginning to gas at the end of use. In this report, the practical use of dry-ice in the form of pulverized state as well as with organic solvents or water are at first described. Then, the efficiency of the various thermal insulation containers such as plastic boxes and dewar vessels were tested. The loss rates of dry-ice in the containers were indicated as the weight decrease and were determined to be 40-100 g/hr* and 10-50 g/hr for plastics boxes (wall thickness; 1.6-6.5 mm, volume; 2-40l) and dewar vessels (made of glass and stainless steel, volume; 1-10l), respectively, at 24-28°C . Heat transfer rates (HTR) for these were also estimated from the loss rates to be 0.3-1.3 kcal/ (m<SUP>2</SUP>·hr·°C) and 0.2-0.6 kcal/ (m<SUP>2</SUP>· hr· °C), respectively. The samples can be safely preserved for 3 or 7 days under - 70°C with 10 kg or 36 kg of pulverized dry-ice without adding any dry-ice while storing, respectively, by using FRP (fiber reinforced plastics) boxes, of which the wall inside is packed by urethane foam (wall thickness 4-6.5 cm) . It allowed us to shipsuccessfully the samples with maintaining below -70 °C from far places such as remote islands or overseas area to the analytical laboratory by commercial delivering systems. The problems on getting the dry-ice at various places and on packing of sample traps into pulverized dry-ice bed in the boxes are also herein described.<BR>*; hr = hour.
- 日本環境化学会の論文
日本環境化学会 | 論文
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