Ipratropium bromide crystal

The invention provides an ipratropium bromide crystal preparation method, which specifically comprises: adding ipratropium bromide into a benign solvent, heating, stirring, dissolving, adding a poor solvent in a dropwise manner after the solution is clarified, and carrying out programmed cooling crystallization to obtain the high-purity ipratropium bromide crystal. According to the invention, thepreparation method is simple to operate, high in product yield and high in product purity, and the prepared ipratropium bromide crystal has good solubility and good chemical stability and is suitablefor industrial production. 本发明提供了一种异丙托溴铵晶体的制备方法。具体步骤为：将异丙托溴铵加入到良性溶剂中后，加热搅拌溶解，溶液澄清后，滴加不良溶剂，通过程序降温析晶得到高纯度的异丙托溴铵晶体。本发明所述的制备方法操作简单、产品收率高、纯度高，并且该晶体具有较好的溶解性与化学稳定性，适合于工业化生产。