| 摘要 |
<p>PURPOSE:To enhance the ratio of removing polyphenylene sulfide from a filter and facilitate after washing, by a method wherein a filter on which polyphenylene sulfide is adhered is washed with an alkali sulfide and an organic solvent while heating. CONSTITUTION:N-methylpyrrolidone as an organic solvent and an alkali sulfide are charged into an autoclave, and the filter to be washed on which polyphenylene sulfide is adhered is placed into the autoclave. Then, the temperature is gradually elevated and the liquid temperature is maintained at a temperature of 100-400 deg.C. The pressure in the autoclave is maintained at 1-20gk/cm<2>, and the treatment is continued at said temperature and said pressure for at least 1hr. After the treatment, the temperature is lowered, whereby the pressure is returned to normal pressure and the filter can be taken out by opening the autoclave. Thereafter, oligomers of polyphenylene sulfide formed through depolymerization and the like are washed out from minute parts of the filter with a fresh organic solvent.</p> |
