abstract |
The invention relates to the production of polyphenylene oxidenby oxidative polycondensation of phenol with oxygen catalysedncopper complexes with nitrogen bases.nFor solvent regeneration on filmnThe rotary evaporator is used as a fluidizerndistillation-residue condensate formednin the chemical purification of 2,6-xylenolnby reaction with formaldehyde or paraformaldehyde. |