摘要
利用Aspen Plus模拟软件对完全热集成变压精馏分离甲酸和水的过程进行了模拟,选用NRTL-HOC物性计算模型,模型的二元交互作用参数通过实验数据进行回归。在完全热集成下,分析了理论板数、回流比及进料位置对产品质量分数和塔釜能耗的影响。确定了较佳工艺条件:减压塔理论板数为34,回流比为7,原料和循环物料进料位置分别为第6和第14块塔板,塔顶甲酸质量分数为0.991;常压塔理论板数为32,回流比为8.6,进料位置为第17块塔板,塔顶水质量分数为0.994。与传统变压精馏比较,完全热集成变压精馏降低加热蒸汽能耗48.6%,冷凝水能耗48.9%,且无需附加再沸器或冷凝器。通过间歇变压精馏实验,验证了工艺的可行性。
Pressure-swing distillation with full heat integration for separation of formic acid and water is investigated.The simulation is performed by Aspen Plus using the NRTL-HOC equation with binary interaction parameters obtained by experimental data of vapor-liquid equilibrium.The influences of stage numbers,reflux ratio and feed stage on the product yield and energy consumption are studied.For vacuum column,the mass fraction of formic acid can reach 0.991 at the top of column under the following conditions：34 of theoretical plate number,7 of reflux ratio,6 and 14 of feed and recycle stream location,respectively.For atmospheric column,the mass fraction of the water at the top of column is 0.994 when theoretical plate number,reflux ratio and feed location are 32,8.6 and 17,respectively.Compared with conventional distillation,pressure-swing distillation with full heat integration can save the steam energy by 48.6％ and cooled water energy by 48.9％.The experiment of batch pressure-swing distillation demonstrates the possibility of the process.
出处
《现代化工》
CAS
CSCD
北大核心
2014年第6期137-141,共5页
Modern Chemical Industry
关键词
甲酸-水
完全热集成
变压精馏
流程模拟
节能
formic acid-water
full heat integration
pressure-swing distillation
simulation and optimization
energy saving
