热泵辅助变压精馏分离碳酸二甲酯/甲醇工艺及系统模拟优化

doi:10.16085/j.issn.1000-6613.2022-0110

摘要/Abstract

摘要：

针对传统变压精馏工艺分离碳酸二甲酯（DMC）/甲醇（MeOH）共沸物存在的高能耗问题，提出了基于热泵辅助的改进变压精馏工艺，并探索了不同热泵方案的可行性和经济性。该研究在ASPEN PLUS模拟平台上进行。首先，设计出传统的热集成变压精馏工艺（H-PSD），并通过塔总组合曲线分析了传统工艺用能瓶颈和工艺改进方向；然后，提出了4种不同型式的热泵辅助的改进工艺，并通过模拟技术取得不同方案的设计参数；最后，采用组合曲线和经济性分析相结合的方法，比较了不同热泵方案的节能效果和经济性。研究表明，各种热泵方案中，基于中间再沸器的蒸汽再压缩式热泵的节能效果及经济性最好。与传统热集成变压精馏比较，过程能耗降低了24.31%，年均操作费用降低了29.43%，年度总成本可降低12.58%，体现了热泵辅助工艺的良好节能效果和经济性。

关键词: 二元混合物, 碳酸二甲酯, 蒸馏, 模拟, 热泵

Abstract:

To solve the problem of high energy consumption in the separation of dimethyl carbonate (DMC)/methanol (MeOH) azeotrope by traditional pressure swing distillation, an improved pressure swing distillation process assisted by heat pump was proposed, and the feasibility and economy of different heat pump schemes were explored. The research was carried out on the ASPEN PLUS simulation platform. The typical heat integrated pressure swing distillation process (H-PSD) was designed, and the energy bottleneck of the typical process and the direction of process improvement were analyzed based on column grand composite curves. Four types of heat pump assisted improved processes were proposed, and the design parameters of different schemes were obtained by simulation. The energy-saving effect and economy of different heat pump schemes were compared by using the methods of composite curve and economic analysis. The research showed that among four kinds of heat pump schemes, the vapour recompression heat pump with intermediate reboiler had the best economic performance. Compared with the typical heat integrated pressure swing distillation, the energy consumption, the total annual operating cost and the total annual cost of the system were reduced by 24.31%, 29.43% and 12.58%, respectively, which indicated the good energy-saving effect and economy performance of the heat pump assisted process.

Key words: binary mixture, dimethyl carbonate, distillation, simulation, heat pump

中图分类号:

TQ028.3

林子昕, 田伟, 安维中. 热泵辅助变压精馏分离碳酸二甲酯/甲醇工艺及系统模拟优化[J]. 化工进展, 2022, 41(11): 5722-5730.

LIN Zixin, TIAN Wei, AN Weizhong. Separation of dimethyl carbonate/methanol via heat pump assisted pressure swing distillation process and system simulation optimization[J]. Chemical Industry and Engineering Progress, 2022, 41(11): 5722-5730.

图/表 11

参考文献 33

4	张建海, 秦俏, 任琪, 等. 反应精馏合成碳酸二甲酯过程优化及热集成研究[J]. 现代化工, 2020, 40(7): 226-229.
	ZHANG Jianhai, QIN Qiao, REN Qi, et al. Study on process optimization and thermal integration of dimethyl carbonate synthesis via reactive distillation[J]. Modern Chemical Industry, 2020, 40(7): 226-229.
5	HUANG Zhixian, LI Junlan, WANG Lieyun, et al. Novel procedure for the synthesis of dimethyl carbonate by reactive distillation[J]. Industrial & Engineering Chemistry Research, 2014, 53(8): 3321-3328.
6	MATSUDA Hiroyuki, TAKAHARA Hideyuki, FUJINO Satoshi, et al. Selection of entrainers for the separation of the binary azeotropic system methanol + dimethyl carbonate by extractive distillation[J]. Fluid Phase Equilibria, 2011, 310(1/2): 166-181.
7	刘立新, 李鲁闽, 刘桂丽, 等. 碳酸二甲酯-甲醇共沸体系分离的模拟与控制[J]. 化工进展, 2017, 36(3): 852-862.
	LIU Lixin, LI Lumin, LIU Guili, et al. Comparison of alternative configurations for separation of dimethyl carbonate-methanol mixture: steady state simulation and dynamic control[J]. Chemical Industry and Engineering Progress, 2017, 36(3): 852-862.
8	CIHAL Petr, VOPICKA Ondřej, DURDAKOVA Tereza-Markéta, et al. Pervaporation and vapour permeation of methanol-dimethyl carbonate mixtures through PIM-1 membranes[J]. Separation and Purification Technology, 2020, 217: 206-214.
9	LI Wenqi, Cristhian MOLINA-FERNÁNDEZ, ESTAGER Julien, et al. Supported ionic liquid membranes for the separation of methanol/dimethyl carbonate mixtures by pervaporation[J]. Journal of Membrane Science, 2019, 598: 117790.
10	张青瑞, 彭家瑶, 张凯. 热集成变压分离碳酸二甲酯-甲醇的优化与控制[J]. 化学工程, 2017, 45(1): 60-65.
	ZHANG Qingrui, PENG Jiayao, ZHANG Kai. Design and control of dimethyl carbonate and methanol separation via heat-integrated pressure swing distillation[J]. Chemical Engineering, 2017, 45(1): 60-65.
11	ZHANG Qingrui, PENG Jiayao, ZHANG Kai. Separation of an azeotropic mixture of dimethyl carbonate and methanol via partial heat integration pressure swing distillation[J]. Asia-Pacific Journal of Chemical Engineering, 2017, 12(1): 50-64.
12	ZHANG Qingjun, YANG Shunjin, SHI Pengyuan, et al. Economically and thermodynamically efficient heat pump-assisted side-stream pressure-swing distillation arrangement for separating a maximum-boiling azeotrope[J]. Applied Thermal Engineering, 2020, 173: 115228.
13	MA Zhaoyuan, YAO Dong, ZHAO Jiangang, et al. Efficient recovery of benzene and n-propanol from wastewater via vapor recompression assisted extractive distillation based on techno-economic and environmental analysis[J]. Process Safety and Environmental Protection, 2021, 148: 462-472.
14	ZHU Zhaoyou, QI Huaqing, SHEN Yuanyuan, et al. Energy-saving investigation of organic material recovery from wastewater via thermal coupling extractive distillation combined with heat pump based on thermoeconomic and environmental analysis[J]. Process Safety and Environmental Protection, 2021, 146: 441-450.
15	GU Jinglian, YOU Xinqiang, TAO Changyuan, et al. Analysis of heat integration, intermediate reboiler and vapor recompression for the extractive distillation of ternary mixture with two binary azeotropes[J]. Chemical Engineering and Processing, 2019, 142: 107546.
16	SAWITRI Dyah Retno, BUDIMAN Arief. Comparative study of heat pump assisted distillation column and its application for pressure swing distillation process[J]. IOP Conference Series: Materials Science and Engineering, 2020, 778(1): 012159.
17	FERCHICHI Mariem, HEGELY Laszlo, LANG Peter. Economic and environmental evaluation of heat pump-assisted pressure-swing distillation of maximum-boiling azeotropic mixture water-ethylenediamine[J]. Energy, 2022, 239:122608.
18	LI Xin, GENG Xueli, CUI Peizhe, et al. Thermodynamic efficiency enhancement of pressure-swing distillation process via heat integration and heat pump technology[J]. Applied Thermal Engineering, 2019, 154: 519-529.
19	于鲁汕, 张瑞英, 张程前, 等. 变压精馏分离甲醇与碳酸二甲酯工艺流程的模拟[J]. 化工设计通讯, 2017, 43(5): 121.
	YU Lushan, ZHANG Ruiying, ZHANG Chengqian, et al. Simulation of separation of methanol and dimethyl carbonate by pressure distillation[J]. Chemical Engineering Design Communications, 2017, 43(5): 121.
20	姚林祥, 刘振锋, 宋怀俊, 等. 变压精馏分离碳酸二甲酯与甲醇工艺流程的模拟[J]. 河南化工, 2013, 30(7): 32-36.
	YAO Linxiang, LIU Zhenfeng, SONG Huaijun, et al. Simulation of pressure swing distillation technology process for dimethyl carbonate and methanol separation[J]. Henan Chemical Industry, 2013, 30(7): 32-36.
21	WEI Hongmei, WANG Feng, ZHANG Junliang, et al. Design and control of dimethyl carbonate-methanol separation via pressure-swing distillation[J]. Industrial & Engineering Chemistry Research, 2013, 52(33): 11463-11478.
22	李春山, 张香平, 张锁江, 等. 加压-常压精馏分离甲醇-碳酸二甲酯的相平衡和流程模拟[J]. 过程工程学报, 2003, 3(5): 453-458.
	LI Chunshan, ZHANG Xiangping, ZHANG Suojiang, et al. Vapor-liquid equilibria and process simulation for separation of dimethyl carbonate and methanol azeotropic system[J]. The Chinese Journal of Process Engineering, 2003, 3(5): 453-458.
23	张立庆, 丁江浩, 陈建刚. 碳酸二甲酯-甲醇-正庚烷三元体系的汽液平衡研究[J].天然气化工, 2003, 28(2): 56-59.
1	SCHAFFNER Benjamin, SCHAFFNER Friederike, VEREVKIN Sergey P, et al. Organic carbonates as solvents in synthesis and catalysis[J]. Chemical Reviews, 2010, 110(8): 4554-4581.
2	ARICO F, TUNDO Pietro. Dimethyl carbonate as a modern green reagent and solvent[J]. Russian Chemical Reviews, 2010, 79(6): 479.
3	王红星, 李海勇, 刘雪艳. 酯交换合成碳酸二乙酯反应精馏工艺的模拟[J]. 计算机与应用化学, 2013, 30(5): 537-541.
	WANG Hongxing, LI Haiyong, LIU Xueyan. Simulation of reactive distillation for diethyl carbonate synthesis by transesterification[J]. Computers and Applied Chemistry, 2013, 30(5): 537-541.
23	ZHANG Liqing, DING Jianghao, CHEN Jiangang. Predication of atmospheric VLE for the ternary system dimethyl carbonate-methanol-n-heptane[J]. Natural Gas Chemical Industry, 2003, 28(2): 56-59.
24	MATSUDA Hiroyuki, INABA Koji, NISHIHARA Keiji, et al. Separation effects of renewable solvent ethyl lactate on the vapor-liquid equilibria of the methanol + dimethyl carbonate azeotropic system[J]. Journal of Chemical & Engineering Data, 2017, 62(9): 2944-2952.
25	RODRı́GUEZ A, CANOSA J, DOMı́NGUEZ A, et al. Vapour-liquid equilibria of dimethyl carbonate with linear alcohols and estimation of interaction parameters for the UNIFAC and ASOG method[J]. Fluid Phase Equilibria, 2002, 201(1): 187-201.
26	FUKANO Makoto, MATSUDA Hiroyuki, KURIHARA Kiyofumi, et al. Ebulliometric determination of vapor liquid equilibria for methanol + ethanol + dimethyl carbonate[J]. Journal of Chemical & Engineering Data, 2006, 51(4): 1458-1463.
27	HOLTBRUEGGE Johannes, LEIMBRINK Mathias, LUTZE Philip, et al. Synthesis of dimethyl carbonate and propylene glycol by transesterification of propylene carbonate with methanol: catalyst screening, chemical equilibrium and reaction kinetics[J]. Chemical Engineering Science, 2013, 104: 347-360.
28	DHOLE V R, LINNHOFF B. Distillation column targets[J]. Computers & Chemical Engineering, 1993, 17(5/6): 549-560.
29	ANNAKOU Omar, MIZSEY Peter. Rigorous investigation of heat pump assisted distillation[J]. Heat Recovery Systems and CHP, 1995, 15(3): 241-247.
30	Valentin PLEŞU, RUIZ Alexandra E Bonet, BONET Jordi, et al. Simple equation for suitability of heat pump use in distillation[M]// Computer Aided Chemical Engineering. Amsterdam: Elsevier, 2014, 33: 1327-1332.
31	YU Jieping, WANG Sanjang, HUANG Kejin, et al. Improving the performance of extractive dividing-wall columns with intermediate heating[J]. Industrial & Engineering Chemistry Research, 2015, 54(10): 2709-2723.
32	CHEN Yichun, HUNG Shihkai, LEE Haoyeh, et al. Energy-saving designs for separation of a close-boiling 1,2-propanediol and ethylene glycol mixture[J]. Industrial & Engineering Chemistry Research, 2015, 54(15): 3828-3843.
33	FAN Yufeng, YE Qing, CEN Hao, et al. Novel process design combined with reactive distillation and pressure-swing distillation for propylene glycol monomethyl ether acetate synthesis[J]. Industrial & Engineering Chemistry Research, 2019, 58(41): 19211-19225.

公用工程	价格/CNY·GJ^-1
电	106.66
低压蒸汽（0.6MPa，160℃）	49.10
中压蒸汽（1.0MPa，184℃）	51.88
高压蒸汽（4.2MPa，254℃）	62.36
冷却水（25～35℃）	2.23

公用工程	价格/CNY·GJ^-1
电	106.66
低压蒸汽（0.6MPa，160℃）	49.10
中压蒸汽（1.0MPa，184℃）	51.88
高压蒸汽（4.2MPa，254℃）	62.36
冷却水（25～35℃）	2.23

项目	H-PSD	方案Ⅰ	方案Ⅱ	方案Ⅲ	方案Ⅳ
高压塔再沸器负荷/MW	9.46	8.88	7.03	5.81	5.94
中间再沸器负荷/MW	0	0	0	3.07	2.94
高压塔压缩机压缩比	0	3.46	3.52	1.66	3.42
高压塔压缩机功率/MW	0	2.02	1.99	0.22	2
高压塔低压蒸汽消耗量/t·h^-1	0	0	0	0	0
高压塔中压蒸汽消耗量/t·h^-1	16.92	0	1.6	10.39	0
高压塔冷却水消耗量/t·h^-1	0	50.03	130.09	30.04	48.65
低压塔再沸器功率/MW	9.09	9.03	9.03	9.03	9.03
低压塔压缩机压缩比	0	1.56	1.56	1.56	1.56
低压塔压缩机功率/MW	0	0.52	0.52	0.23	0.52
低压塔冷却水消耗量/t·h^-1	339.87	105.85	105.85	523.43	105.85
总负荷/MW	9.46	7.62	8.43	7.16	7.56
总负荷降低/%	0	19.45	10.89	24.31	20.08
塔器成本/10⁶CNY·a^-1	6.34	5.76	5.76	5.38	5.38
换热器成本/10⁶CNY·a^-1	5.53	4.07	4.36	5.92	4.36
压缩机成本/10⁶CNY·a^-1	0	5.38	5.34	1.32	5.34
年均投资成本/10⁶CNY·a^-1	11.87	15.21	15.46	12.62	15.08
蒸汽费用/10⁶CNY·a^-1	12.72	0	1.21	7.81	0
冷却水费用/10⁶CNY·a^-1	0.60	0.10	0.16	0.37	0.10
电费/10⁶CNY·a^-1	0	7.03	6.96	1.22	6.97
年均运行成本/10⁶CNY·a^-1	13.32	7.13	8.33	9.40	7.07
年均总成本/10⁶CNY·a^-1	25.19	22.34	23.79	22.02	22.15
年均总成本降低/%	0.00	11.31	5.56	12.58	12.07

项目	H-PSD	方案Ⅰ	方案Ⅱ	方案Ⅲ	方案Ⅳ
高压塔再沸器负荷/MW	9.46	8.88	7.03	5.81	5.94
中间再沸器负荷/MW	0	0	0	3.07	2.94
高压塔压缩机压缩比	0	3.46	3.52	1.66	3.42
高压塔压缩机功率/MW	0	2.02	1.99	0.22	2
高压塔低压蒸汽消耗量/t·h^-1	0	0	0	0	0
高压塔中压蒸汽消耗量/t·h^-1	16.92	0	1.6	10.39	0
高压塔冷却水消耗量/t·h^-1	0	50.03	130.09	30.04	48.65
低压塔再沸器功率/MW	9.09	9.03	9.03	9.03	9.03
低压塔压缩机压缩比	0	1.56	1.56	1.56	1.56
低压塔压缩机功率/MW	0	0.52	0.52	0.23	0.52
低压塔冷却水消耗量/t·h^-1	339.87	105.85	105.85	523.43	105.85
总负荷/MW	9.46	7.62	8.43	7.16	7.56
总负荷降低/%	0	19.45	10.89	24.31	20.08
塔器成本/10⁶CNY·a^-1	6.34	5.76	5.76	5.38	5.38
换热器成本/10⁶CNY·a^-1	5.53	4.07	4.36	5.92	4.36
压缩机成本/10⁶CNY·a^-1	0	5.38	5.34	1.32	5.34
年均投资成本/10⁶CNY·a^-1	11.87	15.21	15.46	12.62	15.08
蒸汽费用/10⁶CNY·a^-1	12.72	0	1.21	7.81	0
冷却水费用/10⁶CNY·a^-1	0.60	0.10	0.16	0.37	0.10
电费/10⁶CNY·a^-1	0	7.03	6.96	1.22	6.97
年均运行成本/10⁶CNY·a^-1	13.32	7.13	8.33	9.40	7.07
年均总成本/10⁶CNY·a^-1	25.19	22.34	23.79	22.02	22.15
年均总成本降低/%	0.00	11.31	5.56	12.58	12.07

[1]	郑谦, 官修帅, 靳山彪, 张长明, 张小超. 铈锆固溶体Ce_0.25Zr_0.75O₂光热协同催化CO₂与甲醇合成DMC[J]. 化工进展, 2023, 42(S1): 319-327.
[2]	崔守成, 徐洪波, 彭楠. 两种MOFs材料用于O₂/He吸附分离的模拟分析[J]. 化工进展, 2023, 42(S1): 382-390.
[3]	徐若思, 谭蔚. C形管池沸腾两相流流场模拟与流固耦合分析[J]. 化工进展, 2023, 42(S1): 47-55.
[4]	张凤岐, 崔成东, 鲍学伟, 朱炜玄, 董宏光. 胺液吸收-分步解吸脱硫工艺的设计与评价[J]. 化工进展, 2023, 42(S1): 518-528.
[5]	郭强, 赵文凯, 肖永厚. 增强流体扰动强化变压吸附甲硫醚/氮气分离的数值模拟[J]. 化工进展, 2023, 42(S1): 64-72.
[6]	邵博识, 谭宏博. 锯齿波纹板对挥发性有机物低温脱除过程强化模拟分析[J]. 化工进展, 2023, 42(S1): 84-93.
[7]	李梦圆, 郭凡, 李群生. 聚乙烯醇生产中回收工段第三、第四精馏塔的模拟与优化[J]. 化工进展, 2023, 42(S1): 113-123.
[8]	张瑞杰, 刘志林, 王俊文, 张玮, 韩德求, 李婷, 邹雄. 水冷式复叠制冷系统的在线动态模拟与优化[J]. 化工进展, 2023, 42(S1): 124-132.
[9]	王太, 苏硕, 李晟瑞, 马小龙, 刘春涛. 交流电场中贴壁气泡的动力学行为[J]. 化工进展, 2023, 42(S1): 133-141.
[10]	孙继鹏, 韩靖, 唐杨超, 闫汉博, 张杰瑶, 肖苹, 吴峰. 硫黄湿法成型过程数值模拟与操作参数优化[J]. 化工进展, 2023, 42(S1): 189-196.
[11]	陈匡胤, 李蕊兰, 童杨, 沈建华. 质子交换膜燃料电池气体扩散层结构与设计研究进展[J]. 化工进展, 2023, 42(S1): 246-259.
[12]	许友好, 王维, 鲁波娜, 徐惠, 何鸣元. 中国炼油创新技术MIP的开发策略及启示[J]. 化工进展, 2023, 42(9): 4465-4470.
[13]	刘炫麟, 王驿凯, 戴苏洲, 殷勇高. 热泵中氨基甲酸铵分解反应特性及反应器结构优化[J]. 化工进展, 2023, 42(9): 4522-4530.
[14]	罗成, 范晓勇, 朱永红, 田丰, 崔楼伟, 杜崇鹏, 王飞利, 李冬, 郑化安. 中低温煤焦油加氢反应器不同分配器中液体分布的CFD模拟[J]. 化工进展, 2023, 42(9): 4538-4549.
[15]	张帆, 陶少辉, 陈玉石, 项曙光. 基于改进恒热传输模型的精馏模拟初始化[J]. 化工进展, 2023, 42(9): 4550-4558.