粗酚的间歇精馏分离模拟

Simulation on batch distillation of crude phenol

以工业粗酚原料为研究对象,利用Aspen Batch Modeler对其进行间歇精馏分离过程模拟计算,物性方法选择NRTLRK,未知物性采用UNIFAC估算,在目标产物苯酚、邻甲酚、间甲酚的质量分数分别为99.0%、96.0%、90.0%的前提下,分别考察了塔操作压力、理论板数、回流比、过渡馏分、杂质含量等多个因素对苯酚、邻甲酚、间对甲酚产品收率的影响情况。结果表明,塔板数增加、回流比增加均可以提高产品收率;操作压力减小会使苯酚的收率略微下降,而邻甲酚和间对甲酚的收率增加;过渡馏分的采集,可使组分的纯度和收率显著增加;中性油和吡啶等杂质的存在会导致产品质量和收率明显下降。模拟结果与现有工业化装置分离情况基本相符。

Aspen Batch Modeler is used to simulate the batch distillation separation process of industrial crude phenol.Taking NRTL-RK as property methods and using UNIFAC to estimate unknown properties,the effects of the operation pressure for tower,number of theoretical tower plate,reflux ratio,slop cut in batch distillation,impurities and other factors on the yields of phenol,o-cresol,m-cresol are investigated respectively under the the premise that the purity of the target products phenol,o-cresol and m-cresol are 99. 0%,96. 0% and 90. 0% separately.The results show that the increase of both the number of tower plates and reflux ratio can improve products＇ yields; the decrease of tower ＇s operation pressure will decrease the yield of phenol slightly while increase the yields of o-cresol and m-cresol; the collection of slop cuts in batch distillation can improve the purity of the composition and yields significantly. The existences of neutral oils and pyridine can result in the significant decrease of quality and yield of products. The simulation results are basically consistent with the separation of existing industrial plants.