| 摘要 |
PCT No. PCT/JP97/03573 Sec. 371 Date Sep. 8, 1998 Sec. 102(e) Date Sep. 8, 1998 PCT Filed Oct. 2, 1997 PCT Pub. No. WO98/15361 PCT Pub. Date Apr. 16, 1998In order to subject a cellulosic material such as insulating paper onto and into which transformer high-voltage insulating oil containing PCB has adhered and permeated to washing that removes the PCB etc. to an undetectable value, the cellulosic material to which PCB etc. has adhered is placed in DMI, sulfolane or other aprotic solvent containing an alkali such as caustic soda and stirred. |
