隔壁塔用于多氯甲烷分离单元的模拟研究
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摘要
以某26万t/a甲烷氯化物装置为研究对象,选取其中多氯甲烷分离单元,采用隔壁塔热耦合技术将混合物分离为3种高纯度产品。利用Aspen Plus软件中Petlyuk模型对分离过程进行模拟,利用灵敏度分析模块进行参数优化,并与实际工况进行对比。结果表明:当进料位置为第24块塔板,侧线出料位置为第38块塔板,回流比为7.0时,二氯甲烷、三氯甲烷、四氯化碳的分离纯度分别为99.99%,99.90%,99.70%,达到分离要求。当二氯甲烷和三氯甲烷进料组成比例保持1∶1.5,四氯化碳的进料质量分数在6%—8%变化时,适宜的气、液相回流流量范围分别为148—150,103—105 kmol/h。与常规双塔精馏过程相比,隔壁塔冷凝器、再沸器负荷分别减少17.98%,23.01%,节能效果显著。
The dividing wall column thermal coupling technology was employed to separate polychloromethane mixtures into three high-purity products, in the polychloromethane separation unit of a 260 kt/a methane chlorides facility. The polychloromethane separation process was simulated by using the Petlyuk model in Aspen Plus software, and its optimized parameters was obtained by using sensitivity analysis module, which was compared with actual working conditions subsequently. The results show that when the feed stage number is 24, and the side product stage number is 38, and the reflux ratio is 7.0, the product purity of dichloromethane, chloroform and carbon tetrachloride is 99.99%, 99.90% and 99.70%, respectively. It meets the separation requirements. As the feed composition ratio of dichloromethane and trichloromethane keeps at 1 ∶1.5, and the feed composition of carbon tetrachloride is changed from 6% to 8%, the appropriate vapor and liquid phase reflux flow ranges are 148-150 and 103-105 kmol/h, respectively. Compared with the traditional two-column distillation process, the heat duty of condenser and reboiler in the dividing wall column are reduced by 17.98% and 23.01%, respectively, and the energy saving effect is remarkable.
The dividing wall column thermal coupling technology was employed to separate polychloromethane mixtures into three high-purity products, in the polychloromethane separation unit of a 260 kt/a methane chlorides facility. The polychloromethane separation process was simulated by using the Petlyuk model in Aspen Plus software, and its optimized parameters was obtained by using sensitivity analysis module, which was compared with actual working conditions subsequently. The results show that when the feed stage number is 24, and the side product stage number is 38, and the reflux ratio is 7.0, the product purity of dichloromethane, chloroform and carbon tetrachloride is 99.99%, 99.90% and 99.70%, respectively. It meets the separation requirements. As the feed composition ratio of dichloromethane and trichloromethane keeps at 1 ∶1.5, and the feed composition of carbon tetrachloride is changed from 6% to 8%, the appropriate vapor and liquid phase reflux flow ranges are 148-150 and 103-105 kmol/h, respectively. Compared with the traditional two-column distillation process, the heat duty of condenser and reboiler in the dividing wall column are reduced by 17.98% and 23.01%, respectively, and the energy saving effect is remarkable.
引文
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[13] 罗俊文.隔壁塔最优操作的稳态分析方法研究[D].天津:天津大学,2014.
[2] KAIBEL G.Distillation columns with vertical partitions [J].Chemical Engineering and Technology,1987,10(2):92-98.
[3] KISS A A,PRAGT H,VAN STRIEN C.Overcoming equilibrium limitations in reactive dividing-wall columns[M].Plesu V,Agachi P S:Computer-Aided Chemical Engineering,2007:24,467-472.
[4] KKISS A A,PRAGT J J,VAN STRIEN C J G.Reactive dividing-wall columns-defying equilibrium restrictions[J].Chemical Product and Process Modeling,2009,4(5):2-15.
[5] OPREA F,FENDU E,NICOLAE M,et al.Process for separating and recovering octanol fractions from the reaction effluent resulting from octanol preparation by oxo synthesis:RO,132345-A2[P].2018-01-30.
[6] OPREA F,FENDU E,NICOLAE M,et al.Process for separating 1,2-dichloropropane by using a dividing-wall column consists in that the organic phase separated from the residue:RO,131635-A2[P].2017-01-30.
[7] JANG N J,LEE M,KIM J Y,et al.Dividing wall column used for purifying neopentyl glycol,includes main column divided into top section,feed section,outflow section,and bottom section and,equipped with dividing wall,condenser and reboiler:WO,2016047960-A1[P].2016-03-31.
[8] OPREA F,FENDU E,NICOLAE M,et al.Process for separation of propenoxide by using a dividing-wall column consists in that the the liquid flow issued from the top of the saponification column:RO,130851-A2[P].2016-01-29.
[9] 凌笑媚,郑伟跃,王晓达,等.隔壁反应精馏技术进展[J].化工进展,2017(8):2776-2786.
[10] 叶青,裘兆蓉,施凤芹,等.用分隔壁精馏塔分离三组分混合物的节能研究[J].化学工程,2007,35(11):54-57.
[11] BECKER H,GODORR S,KREIS H.Partitioned distillation columns-Why,When & How[J].Chemical Engineering,2001,108(1):68-74.
[12] 孙兰义,王汝军,李军,等.反应精馏隔壁塔的模拟研究[J].化学工程,2011,39(7):1-4.
[13] 罗俊文.隔壁塔最优操作的稳态分析方法研究[D].天津:天津大学,2014.