oxiracetam one kind of crystal form and preparation method

The present invention relates to a crystalline form of oxiracetam and its preparation method, the present invention is less crystalline -oxiracetam type impurities, high purity, in particular crystalline form is very stable, good quality stability, excellent particle flow, facilitate transport, storage and production of pharmaceutical preparations, in clinical applications to better protect the efficacy and safety of its pharmaceutical formulations. The present invention further provides a crystalline form of the preparation of oxiracetam method for green technology, using only water as the solvent, simple operation, low cost, and the product obtained free of residual organic solvents, good safety particularly suitable for industrial production.