CIESC Journal ›› 2019, Vol. 70 ›› Issue (5): 1815-1822.doi: 10.11949/j.issn.0438-1157.20181005

• Separation engineering • Previous Articles     Next Articles

Solvent evaluation model base on energy consumption objective for aromatic extraction distillation units

Qin WANG(),Bingjian ZHANG,Chang HE,Qinglin CHEN()   

  1. School of Chemical Engineering and Technology /Guangdong Engineering Technology Research Center for Petrochemical Energy Conservation, Sun Yat-sen University, Guangzhou 510275, Guangdong, China
  • Received:2018-09-10 Revised:2019-03-05 Online:2019-05-05 Published:2019-05-10
  • Contact: Qinglin CHEN E-mail:wangq356@mail2.sysu.edu.cn;chqlin@mail.sysu.edu.cn

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Abstract:

Based on the NRTL activity coefficient model, the whole process simulation and process parameters were optimized by using Aspen Plus for extractive distillation equipment for aromatics recovery from different single component extractants. With consideration of multiple variables and their interactions, a coordinative optimization strategy was further proposed from iterative optimization of local coupling parameters. At given separation specifications, energy consumption was optimized through adjusting critical operating parameters, such as the feed stages of extractive distillation column(EDC), the feed stage of entrainer recovery column(ERC) and the reflux ratio of ERC. An energy consumption model correlated with physical properties was presented based on the energy transfer rules. A solvent evaluation model based on the energy consumption objective for aromatic extraction distillation processes was put forward through the analysis of energy consumption and separation efficiency with different solvents. The results show that the molecular weight and boiling point of solvent are the pivotal factors influencing the energy consumption of aromatics extraction distillation units. There is a high correlation of the energy consumption model with the R 2 value bigger than 0.9 which can guide the selection, evaluation and design of the extracting solvent for an aromatic ED process.

Key words: extractive-distillation, thermodynamics, optimization, arene, property correlation, model

CLC Number: 

  • TQ 028.3

Table 1

Relative volatility of methyl cyclohexane (i) and benzene (j) varying with different solutions[25] "

溶剂组成 F Solvent/% T bub/℃ ɑij
无溶剂 80 0.81
环丁砜 87.8 121 4.2
环丁砜-0.8%H2O 87.8 113 4.7
环丁砜-10%COS 87.8 125 3.6

Fig.1

Typical flowsheet of aromatic extractive distillation unit"

Table 2

Typical operating conditions of process"

设备 操作参数 值

EDC[border:border-top:solid;]

 原料S2进料状态 饱和气相
塔板数 固定值
塔顶/底压力/MPa 0.07/0.075

ERC

 塔板数 固定值
塔顶/底压力/MPa -0.05/-0.025

Fig.2

Optimization procedure for adjustable parameters"

Table 3

Physical property and energy consume of different solvents for benzene-cyclohexane extractive distillation process"

溶剂 分子式 M/(g?mol-1) T b/K Q EDCR/(GJ?h-1) Q ERCR/(GJ?h-1) R ERC F S/(kmol?h-1)
N-methyl-2-pyrrolidone C5H9NO 99.130 477.420 5.115 5.561 1.096 288.220
N,N-dimethylformamide C3H7NO 73.100 425.150 5.170 5.205 1.881 362.223
N-formylmorphol C5H9NO2 115.130 513.150 5.417 9.010 1.440 242.481
triethylene glycol C6H14O4 150.170 561.500 5.873 13.701 1.381 193.689
tetraethylene glycol C8H18O5 194.230 602.700 6.180 15.707 0.248 175.638
dimethyl sulfone C2H6OS 78.130 464.000 4.943 9.312 3.060 344.661
tetramethylene sulfone C4H8O2S 120.170 560.450 5.275 9.688 0.847 260.632
furfural C5H4O2 96.090 434.850 5.033 4.824 1.588 349.152
aminobenzene C6H7N 93.130 457.150 5.039 10.448 3.418 272.229
methyl benzoate C8H8O2 136.150 472.650 5.256 4.810 0.708 258.181
2-pyrrolidone C4H7NO 85.110 524.320 5.175 12.041 2.852 292.076
glyceryl triacetate C9H14O6 218.210 532.150 6.061 10.541 0.551 180.986
quinoline C9H7N 129.160 510.310 5.332 6.189 0.452 254.335
benzyl acetate C9H10O2 150.177 487.150 5.472 4.283 14.790 230.040
phenol C6H6O 94.113 454.990 5.094 14.094 4.946 275.459
N-hexyl-acetate C8H16O2 144.214 444.650 5.351 7.084 2.000 219.166
methyl isobutyl ketone C6H12O 100.161 389.150 6.330 12.681 5.384 360.443

Fig.3

Relation of energy consumption, operating parameters and physical properties for benzene-cyclohexane extractive distillation process"

Table 4

Regression parameter of operating parameters vs physical properties for benzene-cyclohexane extractive distillation process"

关联关系 p 00 p 10 p 01 p 20 p 11 p 02 R 2
N min,ERC-R ERC,R min,ERC 0.9433 0.04556 1.502 -0.01314 0.2514 -0.5201 0.9889
F S-ΔH V,M 1842 -50.36 -5.63 0.4307 0.0813 0.002913 0.9218
Q solvent-T b,M 9.666 3.203 1.134 0.3232 0.6963 -0.1054 0.9919

Fig.4

Relation of energy consumption, operating parameters and physical properties for toluene-n-heptane extractive distillation process"

Table 5

Regression parameter of operating parameters vs physical properties for toluene-n-heptane extractive distillation process"

关联关系 p 00 p 10 p 01 p 20 p 11 p 02 R 2
N min,ERC-R ERC,R min,ERC 1.074 0.07526 2.27 -0.0224 0.2504 -0.6305 0.9849
F S-ΔH V,M -73.88 14.31 -0.7569 -1.369 -0.1749 0.003865 0.9138
Q solvent-T b,M 5.302 -0.06346 0.05997 0.0001166 -0.0001447 9.862×10-5 0.9742
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