| 摘要 |
PURPOSE:To produce isoprene, by reacting an isobutylene source with a formaldehyde source in a low-temperature reaction zone in a completely liquid phase to obtain an isoprene precursor, carrying out the heat-exchange of the obtained reaction liquid with the liquid discharged from the high-temperature reaction zone, and decomposing the reaction liquid to isoprene in the high-temperature reaction zone. CONSTITUTION:An isobutylene source (e.g. isobutylene, t-butanol, alkyl t-butyl ether, etc.) is made to react with a formaldehyde source in the presence of water and an acidic catalyst in a low-temperature reaction zone in a completely liquid phase at 60-140 deg.C to obtain the isoprene precursor. The obtained reaction liquid is subjected to the heat-exchange with the liquid discharged from the high- temperature reaction zone, and is decomposed to isoprene at 150-230 deg.C and <=40atm in the mixed stage of gas and liquid in the high-temperature reaction zone. EFFECT:The objective compound can be produced easily in high yield without separating the isoprene precursor. The high-temperature reaction can be stabilized, and the energy cost can be remarkably saved. |
