| 摘要 |
This invention relates to an improvement in a process and apparatus for delivering ultra high purity liquid carbon dioxide to a point of use at pressures above ambient without pumping. In the process a high purity carbon dioxide feed in gaseous or liquid form is charged to a vessel and at least partially solidified, i.e., converted to a solid phase. As the liquid is converted to a solid phase, additional liquid is added until the vessel is at least substantially filled with slush. Once filled, the slush or solid is isochorically heated, i.e., heated at constant volume whereby the solid phase carbon dioxide is converted to a liquid. Liquid, then, is withdrawn from the vessel at a desired pressure at a rate at which the solid phase carbon dioxide is converted to a liquid.
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