The dipentaerythritol crystal of more than 90% in purity from pentaerythtitol waste residue can be achieved by analyzing the different crystal characteristic of two materials.

• 通过对两种不同物质结晶特征的分析,成功地从季戊四醇废渣中结晶分离二季戊四醇,一次结晶纯度达到90%25以上。