METHOD FOR PREPARING PRECURSOR OF HOLLOW FIBER CARBON MOLECULAR SIEVE MEMBRANE FOR RECOVERING FLUORINATED GAS, AND PRECURSOR OF HOLLOW FIBER CARBON MOLECULAR SIEVE MEMBRANE FOR RECOVERING FLUORINATED GAS AND HOLLOW FIBER CARBON MOLECULAR SIEVE MEMBRANE PREPARED THEREBY

摘要

The present invention provides a method for preparing a precursor of a hollow fiber carbon molecular sieve membrane for recovering fluorinated gas, comprising the steps of: i) obtaining a dope solution by mixing a polyimide, a solvent, a cosolvent and a nonsolvent; ii) supplying and discharging the dope solution via a spinning nozzle along with a bore solution; iii) forming a hollow fiber by bringing the discharged dope solution into contact with a coagulating solution; and iv) winding, washing and drying the hollow fiber formed in step iii). The present invention allows the preparation of a precursor of a hollow fiber carbon molecular sieve membrane for recovering fluorinated gas having high nitrogen permeability and nitrogen selectivity for fluorinated gas and excellent thermal and chemical characteristics, and a hollow fiber carbon molecular sieve membrane prepared by thermally treating the same. In addition, it is expected that fluorinated gas can be recovered with high efficiency from a fluorinated gas/nitrogen gas mixture by modularizing the hollow fiber carbon molecular sieve membrane.