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. |