| 摘要 |
A method to provide polyether polyols comprises the steps of
€¢ Providing a crude polyether polyol mixture comprising polyether polyol and a base catalyst;
€¢ neutralizing said base catalyst;
€¢ removing, in a first dehydration step, at least part of the water from the neutralized polyether polyol;
€¢ redissolving at least part of the salt crystals obtained by removal of at least part of the water;
€¢ removing, in a second dehydration step, at least part of the water from the neutralized polyether polyol mixture, thereby providing salt crystals;
€¢ removing the salt crystals from the neutralized polyether polyol, thereby providing the polyether polyol mixture. |
