异丁烷精馏过程的模拟优化及热力学分析  

Simulation optimization of isobutane distillation and thermodynamic analysis

作　　者：唐超[1] 吴越峰 崔鹏[1] 陈亚中[1] 胡存 钱俊 

机构地区：[1]合肥工业大学化工学院,安徽合肥230009 [2]东华科技股份有限公司,安徽合肥230009

出　　处：《化学工程》2015年第1期69-72,共4页Chemical Engineering(China)

摘　　要：针对工业上对异丁烷纯度要求以及精馏分离过程能耗较大等特点,首先对要分离的C3和C4混合物体系深入分析,建立了异丁烷精馏新工艺方案,应用流程模拟软件Aspen Plus进行设计,采用严格计算模块和SRK热力学方法。目前,模拟过程准确性的关键在于热力学模型的选用上,为了解决这一问题,提出了对现场实测数据进行热力学一致性原则检验,并与SRK模型数据进行比较以验证其准确性。通过设计规定与灵敏度分析工具来优化操作参数,并对结果进行了热力学分析。研究结果表明:最合适的工艺方案为精馏塔理论塔板数为93,三股原料分别在第24,28,46块板位置进料,质量回流比为7.0,分离效果可达到塔顶异丁烷质量分数大于98.5%,热力学效率达到50.072%。模拟和优化结果表明新工艺方案效果较佳,为实际生产提供了准确的依据。By considering the high energy consumption and the needful I-butane purity in the industry, a new conventional process was proposed to separate I-butane from a mixture of the compound with C3 and C4. The simulations of various process parameters treating different heat duty and separation requirements were performed by Aspen Plus software whose RADFRAC block and SRK physical property set were used. The current accuracy of simulation results depended on the appropriate of the physical property method. For this problem, thermodynamic consistency test was used to verify the actual data, and compared with the calculated results of SRK property method. With the tools of sensitivity and design specifications, the operating parameters were generated, and the thermodynamic analysis was carried on for this process. The results show that under the optimal operating conditions of theoretical stages 93, feed stage at 24, 28, 46, and mass reflux ratio of 7.0, the mass fraction of I-butane is to exceed 98.5%, and the thermodynamics efficiency is to reach 50. 072%. The results show that the process has excellent effects, which demonstrates that the proposed process is an energy-saving, cost-effective and green technology. This provides a basis for the actual production process.

关 键 词：ASPEN PLUS 异丁烷精馏 热力学一致性 热力学效率 

分 类 号：TQ221.14[化学工程—有机化工]