A company’s isocyanate and polyether MMDI distillation column is a Dividing wall column (called DWC). During the trial operation, the dividing wall is distorted so that the distillation can not work on. Finite element method was used in this subject, considering the dividing wall with no flaw, unevenness and with initial stress, studying the deformation during the temperature loading, unloading and re-loading respectively. According to the results, main factors for the deformation of dividing wall were analyzed and possible solutions were proposed eventually.

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