多效反应精馏过程生产氯化苄的能量集成

Energy integration of multi-effect reactive distillation for benzyl chloride production

以甲苯氯化生产氯化苄为研究对象,对带侧反应器的反应精馏与精制塔串联工艺(CSRRT)进行研究及能量分析,建立了分段反应精馏与精制塔串联生产氯化苄的新工艺。利用精制塔塔顶蒸汽潜热加热第一段反应精馏塔的塔釜,建立了多效反应精馏(MERD);进一步利用侧反应器的甲苯氯化反应热加热第一段反应精馏塔的塔板物料,建立了多效透热反应精馏(MEDRD)。在相同生产要求下,对3种工艺的能耗进行比较。结果表明,MERD和MEDRD过程实现了能量的优化利用,与CSRRT过程相比,塔釜总再沸器热负荷分别降低16.8%和33.7%。

Based on the energy analysis of distillation column with side reactors （CSR） and refining tower （CSRRT） for benzyl chloride production, a new process with two reactive distillation stages was established. Using the steam latent heat of refining tower to heat the kettle of the first reactive distillation tower, a multi-effect reactive distillation （MERD） was proposed. Furthermore, using the reaction heat to heat the tray of the first reactive distillation tower, a multi-effect diabatic reactive distillation （MEDRD） was also investigated. The energy consumptions of the above three processes were compared under the same production requirement. The results showed that comparing with CSRRT, the energy consumption of MERD and MEDRD declined 16.8% and 33.7%, respectively.