| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To efficiently obtain ice in which little amount of solvent is contained. <P>SOLUTION: Water absorbed the solvent in exhaust gas is frozen in a freezer 21 and the solvent is not frozen from a difference of a coagulation point while water is frozen to become ice and concentrated water. Next, ice is stored in an ice storage tank 56 and this ice storage tank 56 is reduced in pressure by a vacuum pump 92. The freezing point lowers by reducing the pressure in the ice storage tank 56 and melted water containing a large amount of the solvent is efficiently taken out and air bubbles (the solvent is taken in air bubbles) taken in ice can be taken out. Then, the melted water melted in early stages is excluded as concentrated water and separated from ice with high separation efficiency. Ice becomes near to pure water and clean ice not containing the solvent too much is melted to be reutilized as water. <P>COPYRIGHT: (C)2003,JPO</p> |
