| 摘要 |
A method is disclosed for controlling the interfacial level of solvent vapor and overhead gas in a vessel. The solvent vapor level is controlled by means of a displacement body which is suspended from a load cell. The displacement body is partially immersed in the solvent vapor with the remainder being immersed in the overhead gas covering the solvent vapor. The displacement body's apparent weight is measured by the load cell and used to control the rate of solvent vapor removal from the spin-cell thereby maintaining the solvent vapor/overhead gas interface in the spin-cell at a desired level.
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