摘要
采用常规反应精馏塔系分离具有最不利相对挥发度排序的四元可逆反应物系会要求反应精馏塔侧线出料具有过低的反应物浓度,这既不利于反应物的转化又增加了系统的能耗。为解决这一问题,可对常规反应精馏塔系做如下改进:从常规精馏塔引出一条气相物流加热反应精馏塔;在两塔连接物流中引入物质传递操作;将两塔集成于一个塔壳中,由此给出了一种新型的双隔壁反应精馏塔。该双隔壁反应精馏塔能够容忍左隔离壁顶端处轻反应物浓度较高。以四元理想反应物系的分离为例,对常规反应精馏塔系与该双隔壁结构进行比较与分析。结果表明,后者明显优于前者,具有较低的设备投资与操作能耗。基于化学平衡常数和产物摩尔分数进行摄动分析,所得结果也表明该双隔壁反应精馏塔的稳态性能具有较强的鲁棒性。
Separation of quaternary reversible reactants with the worst relative volatility ranking by conventional reactive distillation column system(CRDS) requires too low reactant concentration for side-line outlet of reactive distillation column,which is unfavorable to the conversion of reactants and will augment the energy consumption of the system.To solve this problem,three renovation ways can be selected:(ⅰ) a vapor flow is withdrawn from the conventional distillation column to heat the reactive distillation column;(ⅱ) mass transfer operation is added into the interlinking flows between two distillation columns;(ⅲ) these two columns are integrated in one shell,thereby leading to the proposal of a novel double dividing-wall reactive distillation column(DD-RDC). This DD-RDC allows a relatively high concentration profile of the lightest reactant at the top end of the left dividing wall.In terms of the separation of an ideal quaternary reacting mixture system,CRDS and DD-RDC are compared and analyzed.The obtained results show that the latter shows more advantageous over the former with reduced capital investment and operating cost. The parametric analysis is further carried out with reference to the chemical equilibrium constant and product purity.The obtained results demonstrate again that the steady-state behaviors of DD-RDC are quite robust.
作者
顾克
陈海胜
苑杨
钱行
黄克谨
GU Ke;CHEN Hai-sheng;YUAN Yang;QIAN Xing;HUANG Ke-jin(College of Information Science and Technology,Beijing University of Chemical Technology,Beijing 100029,China)
出处
《现代化工》
CAS
CSCD
北大核心
2019年第11期202-206,共5页
Modern Chemical Industry
基金
国家自然科学基金项目(21676011)
中央高校基本科研业务费专项资金(ZY1930)
关键词
双隔壁反应精馏塔
物质和能量耦合
过程设计
稳态性能
参数分析
double dividing-wall reactive distillation column
coupling substances with energy
process design
steady-state performance
parametric analysis
