| 摘要 |
A method of producing solid carbon dioxide comprises the steps of providing a supply of refrigerant (1) which is arranged to flow along a path at least part of which is adjacent to a die (4) so that the refrigerant is in thermal contact with the die (4), providing a supply of liquid carbon dioxide (9) to an inlet at one end of the die (4) and allowing the carbon dioxide to flow into the die (4), and, extruding solid carbon dioxide (16) from an outlet (12) at the other end of the die (4) under the pressure exerted by liquid carbon dioxide at the die inlet. In a preferred embodiment, solid carbon dioxide is formed by directly refrigerating liquid carbon dioxide using liquid nitrogen as refrigerant. <IMAGE> |
