Using PEG400-CuCl_2-NiCl_2 as composite catalyst,pinacolone is synthesized by 2-chloro-2-methylbutane with formaldehyde. Effecting of PEG400-CuCl_2-NiCl_2 catalyst on the percent conversion of2-chloro-2-methylbutane and the various factors such as usage of PEG400-CuCl_2-NiCl_2 composite catalyst,different moral ratio of CuCl_2 and NiCl_2,reaction temperature,titration time of formaldehyde and concentration of hydrochloric acid solution have been studied,testing the substance content and structure in the rea...