| 摘要 |
<p>A process for neutralizing an unneutralised polyether polyol prepared using a base catalyst according to the invention comprises the steps of addition of a polyprotic acid to the unneutralised polyether polyol, the highest pKa-value of the polyprotic acid being less than 3.5, wherein, per kilogram of unneutralised polyether polyol,“A”moles of said polyprotic acid are added to the unneutralised polyether polyol, such that (n−1 )*A<B<n*A, wherein▪B being the moles of protons necessary to completely neutralize a kilogram of unneutralised polyether polyol;▪n being the number of protons which said polyprotic acid can donate; removing water from said neutralised polyether polyol at a temperature between 100 deg C and 160 deg C, providing dewatered neutralised polyether polyol with a water content of less than 1%w based upon the weight of the dewatered neutralised polyether polyol; removing the crystals formed during the steps of addition of acid and removal of water from the neutralised polyether polyol.</p> |
