| abstract |
(57) [Problem] To provide a method for easily producing purified polyethersulfone in which the content of impurities such as inorganic substances is significantly reduced by a simple operation. A method for producing purified polyethersulfone, comprising contacting an organic solvent solution of crude polyethersulfone with an adsorbent. The organic solvent is at least one polar solvent selected from sulfoxide solvents, amide solvents, pyrrolidone solvents, piperidone solvents, 2-imidazolinone solvents, diphenyl compounds, hexamethylene sulfoxide, γ-butyrolactone, and sulfolane. The above-mentioned manufacturing method characterized by the above-mentioned. |