| 摘要 |
PURPOSE: A recovering method of methylene chloride using a separation membrane is provided to make it possible to recycle recovered methylene chloride and prevent air pollution by recovering the methylene chloride with circulation separation process. CONSTITUTION: Nitrogen gas containing methylene chloride is pressurized by a compressor(1). Then, it is condensed by a condenser(2) to recover condensed methylene chloride. Then, the nitrogen gas containing methylene chloride is passed through a separation membrane(4) and a nitrogen gas containing highly-concentrated methylene chloride is recirculated to the compressor(1). A nitrogen gas containing low-concentrated methylene chloride is injected to an absorption tower(5) to remove the trace methylene chloride and discharge the nitrogen gas to atmosphere.
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