采用错流平板膜超滤技术，使用聚醚砜超滤膜精制低不饱和度聚醚多元醇，粗聚醚多元醇由正己烷1:1体积比稀释。在前期对操作压力，料液流速等条件研究的基础上，采用阻力叠加法建立膜通量与各影响因素之间的数学模型，通过实验数据拟合模型参数。结果表明：模型拟合值曲线与实验数据拟合良好，各曲线的相关系数均在0.99左右，且膜通量的理论值与实验值之间的相对偏差较小，在0.13%~14.02%范围内。根据该数学模型，可以预测不同操作条件下的膜通量值，同时为精制工艺的工业化生产提供有效的工艺参数。

Flat membrane ultrafiltration was applied to purification of low unsaturated degree polyether polyols, which flat membrane prepared from polyethersulphone(PES). Crude polyether polyols were used as polyols/hexane miscella in a 1:1 proportion. Based on the studies on operating pressure and flow speed, a mathematic resistance model describing membrane flux as a function of pressure and flow rate was established, and the model parameters were got by fitting the experimental data. The resullts showed that the predicted results of membrane flux as a function were in good agreement with the experimental results well, with a relative error varying between 0.13%~14.02%, and the correlation coefficients were all around 0.99. Using this model, flux change can be predicted and the effective process parameters were prvided for the industrial purification process.

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