双金属氰化络合物催化剂用于聚醚多元醇生产

Double metal cyanating complex catalysts for preparing polyether polyols

在聚合反应器中考评了自制的双金属氰化络合物催化剂性能。结果表明,该催化剂活性高、诱导期短,相应的聚醚多元醇不饱和度低和分子量易于调节,其残留的催化剂浓度低,无需后处理即可使用。本反应系统以循环冷却、喷雾为手段,既快速移走了聚合热,又实现大面积接触的气体-液滴反应,减少了反应延迟时间,降低了聚合釜中液相环氧丙烷浓度,从而使整个工艺流程的物耗、能耗明显下降。

The performance of the homemade double metal cyanating complex (DMC) catalysts were evaluated in a non-stirred tank reactor equipped with an external heat exchanger. The results showed that DMC catalysts exhibited features of high activity and short induction period. The unsaturation degree and molecular weight of the polyester polyols prepared with the catalyst were easily adjustable; the resultant contains low concentration of residual catalyst and could be directly applied without further processing. The reactive system in the present work used cyclic cooling and spraying as means for quickly removing polymerization heat and realizing gas-droplet reaction on a larger contact area. The material consumption and energy consumption in the whole process flow was obviously lowered because of the shortened reactive time delay and the reduced concentration of propylene oxide in liquid phase inside the polymerization reactor.