Research On The Synthesis Of Downstream Products From2-butyne

The utilization of C5fraction from the ethylene cracker byproduct is an important symbol to measure the utilization level of C5. With the development of ethylene industry, C5comprehensive utilization gradually attracted national attention.2-Butyne is one component of light C5fraction. The development of its downstream product can not only bring new profit growth point, but also improve the utilization of the C5. This paper focuses severaly on the hydration and the cyclotrimetrization of2-butyne as raw material to prepare methylethylketone and hexamethylbenzene, respectively. Based on the catalyst test and the optimization of reaction conditions, excellent experimental results were obtained.The hydration reaction of2-butyne for producing methylethylketone was carried out at atmospheric pressure. NaAuCl4was selected as an effective catalyst. By adding sulfuric acid into the reaction solution, the catalytic activity and selectivity couled be remarkably improved. Experimental results showed the2-butyne complete conversion and the yield of90%for methylethylketone respectively under reaction conditons as follows:n(H2SO4): n(NaAuCl4)=10:1,n(H2O):n(2-butyne)=10:1, w(NaAuCl4):w(2-butyne)=1:10, the reaction at75℃for4h in methanol solvent.In Study of2-butyne cyclotrimerization reaction for preparing hexamethylbenzene, PdCl2/CuCl2was selected as a catalyst. Effects of various factors on the reaction were examined. The conversion of100%for2-butyne and the yield of58.4%for hexamethylbenzene were obtained respectively under optimal reaction conditons as follows: the dichloromethane as solvent, n(PdCl2):nCuCl2)=1:20, n(PdCl2):n(2-butyne)=2.5:100, n(2-butyne):n(CH2Cl2)=1:16, the reaction at60℃for9h.