| 摘要 |
The present invention relates to a process for removing basic catalysts from polyether-polyols which remain in these products from the preparation of polyether-polyols. The removal is carried out by hydrolysis and introduction of CO2 and subsequent removal of the resultant carbonate by filtration. Finally, the content of residual bases is adjusted to any desired level by post-neutralisation by means of acids, preferably by means of oxalic acid. |
