摘要:
隔壁精馏塔可以用于分离三组分混合物,本文将其运用至氯乙烯高沸物的回收分离中.通过对氯乙烯高沸物进行Aspen模拟计算,优化隔壁精馏塔的压力、进料板位置、侧线采出位置、回流比以及分气比、分液比等操作参数,得出最优操作参数为:压力0.7 MPa,进料位置第7块塔板,侧线采出位置第10块塔板,回流比35,分液比0.239,分气比0.342.在上述参数下,隔壁塔有效地改善了产品的分离效果,并对高沸物中的氯乙烯、二氯乙烷以及三氯乙烷进行回收,以达到节能减排的目的.最后,将隔壁精馏塔与常规双塔流程进行比较,在相同产品分离要求的情况下,隔壁精馏塔全年总费用节省20.2%,节能效果明显.%A dividing wall column has been employed in the recovery and separation of vinyl chloride high-boiling mixtures,and used to separate the three-component mixture.The distillation process of the high-boiling mixtures was simulated by Aspen Plus software.In order to improve economic efficiency and reduce pollutant emission,this study optimized the operating parameters of the process,such as pressure,feed stage,side-draw stage,reflux ratio,and liquid by analyzing the relationship between each parameter and the energy consumption and purity of products.The optimal operating parameters of the column are as follows:pressure of 0.7 MPa,7 feed-stages,10 side-draw stages,a reflux ratio of 35,a distribution ratio of liquid of 0.239 and a distribution ratio of vapor of 0.342.Compared with the conventional two-column process,the total annual cost saving when employing the dividing wall column is 20.2% in the case of the same product separation requirements.