夹点技术在醋酸丙烯酯法生产环氧氯丙烷过程的应用研究

Application of Pinch Technology for epichlorohydrin production via propylene acetate method

环氧氯丙烷作为重要的化工中间体,是环氧树脂和某些精细化工品的主要原料,但是现有醋酸丙烯酯法生产装置的能量利用存在部分不合理的环节,为了降低能耗、减少蒸汽消耗,提高其市场竞争力,本文首先依据夹点技术原理,对现有醋酸丙烯酯法生产环氧氯丙烷工艺进行了研究;通过工艺流程模拟软件(ASPEN PLUS)和换热网络计算软件(ASPEN ENERGYANALYZER)的分析,确定了原有醋酸丙烯酯法生产环氧氯丙烷的工艺流程中存在的瓶颈,并提出了优化的换热网络;进而,对整体工艺流程进行能量利用优化,通过引入蒸汽喷射式热泵实现跨越夹点的换热,进一步降低了生产过程中的能耗。研究结果表明,上述能量利用优化的节能效果显著,优化后的换热网络比原有工艺流程中的换热网络节省蒸汽消耗18.8%,节省循环水消耗26.6%。

Epichlorohydrin as an important chemical intermediate,is the main raw material of epoxy and some important fine chemical,but the existing production via propylene acetate has some irrational part in energy-using unit.In order to save energy,reduce the steam consumption and enhance the market competitiveness,firstly the industiral epichlorohydrin process produced via the propylene acetate method was studied according to the Pinch Technology,then based on the process simulation software（ASPEN PLUS） and the heat exchanger network computing software （ASPEN ENERGY ANALYZER）,the bottleneck of the existing floweet was found,and an optimized heat exchanger network was put forward to optimize the energy efficiency of the whole process.Then,a steam jet pump was introduced in the flowsheet to realize the heat exchanging across the pinch point,which can save more energy.The obtained optimized heat exchanger network has significant advantages of energy-saving,i.e.,saving 18.8%steam consumption and 26.6%water consumption according to on the simulation.