脱沥青油糠醛萃取过程中液-液相平衡模拟研究
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摘要
溶剂脱沥青工艺(SDA)副产的脱油硬沥青(DOA)生产高等级道路沥青时需要大量高价格的优良软组分,脱沥青油(DAO)-糠醛萃取工艺可以为沥青调和工艺提供优良软组分,实现DOA的合理增值。本文采用族组分划分法(Kuop法)将脱沥青油各温度馏分划分为饱和分、芳香分、胶质和沥青质;然后基于UNIFAC热力学方程对DAO-糠醛萃取体系进行了模拟研究,结果显示:计算值与实验值最大误差小于5%;随着温度的升高,精制油收率增加,饱和分含量增大;随着剂油比(质量比)的增加,精制油收率呈线性增加,组成基本不变;在液-液相平衡操作条件下,随着理论级数增加,精制油收率及组成基本不变;在非平衡操作条件下,精制油收率为30.1%(wt);升高温度降低了糠醛对芳香分的选择性溶解性能,剂油比不影响糠醛的选择性溶解能力。
A large amount of expensive and high quality soft components are needed when using deoiled asphalt(DOA) from solvent deasphalt processes(SDA) to produce high grade road blending asphalt.Furfural-deasphalted oils(DAO) extraction processes can provide soft component thus increase DOA value. The Kuop method was adopted to describe the four components(saturates, aromatics, resins and asphaltene) in DAO,and a model based on the UNIFAC thermodynamic equation describing liquid–liquid equilibrium in furfural-deasphalted oils was developed to simulate the extraction process. The results show that the maximum error between calculated values and experimental values is less than 5%. Refined oil yields and saturates contents increase with the increase of temperature, and refined oil yields increase linearly with the increase of furfural-DAO mass ratio, while the contents remain unchanged. Under liquid-liquid equilibrium conditions, the yield and content of refined oil remain unchanged with the increase of theoretical stage. However, the yield of refined oil increases to 30.1%(wt) under non-equilibrium conditions. These results indicate that the selective dissolution of aromatics in furfural can be reduced under higher temperatures, but it is not affected by furfural-DAO mass ratios.
A large amount of expensive and high quality soft components are needed when using deoiled asphalt(DOA) from solvent deasphalt processes(SDA) to produce high grade road blending asphalt.Furfural-deasphalted oils(DAO) extraction processes can provide soft component thus increase DOA value. The Kuop method was adopted to describe the four components(saturates, aromatics, resins and asphaltene) in DAO,and a model based on the UNIFAC thermodynamic equation describing liquid–liquid equilibrium in furfural-deasphalted oils was developed to simulate the extraction process. The results show that the maximum error between calculated values and experimental values is less than 5%. Refined oil yields and saturates contents increase with the increase of temperature, and refined oil yields increase linearly with the increase of furfural-DAO mass ratio, while the contents remain unchanged. Under liquid-liquid equilibrium conditions, the yield and content of refined oil remain unchanged with the increase of theoretical stage. However, the yield of refined oil increases to 30.1%(wt) under non-equilibrium conditions. These results indicate that the selective dissolution of aromatics in furfural can be reduced under higher temperatures, but it is not affected by furfural-DAO mass ratios.
引文
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[11]Joaquim J.C.Aparicio,Manuel A.S.Jerónimo,Fernando G M.Two different approaches for RDC modeling when simulating a solvent deasphalting plant[J].Computers and Chemical Engineering,2002,26(10):1369-1377.
[12]CAO Fa-hai,JIANG Dan,LI Wu-dong,et al.Process analysis of the extract unit of vacuum residue through mixed C4 solvent for deasphalting[J].Chemical Engineering and Processing,2010,49(1):91-96.
[13]LI Wu-dong(李武东),DU Ping-an(杜平安),CAO Fa-hai(曹发海),et al.Simulation and optimization of the extract segment of solvent deasphalting plant(溶剂脱沥青抽提段的模拟与优化)[J].Computer and Applied Chemistry(China)(计算机与应用化学),2009,26(4):455-460.
[14]LI Wu-dong(李武东).Simulation and optimization of solvent deasphalt process and DAO refining technology(溶剂脱沥青过程和DAO精制工艺的模拟与优化)[D].Shanghai(上海):East China University of Science and Technology(华东理工大学),2009.
[15]DU Ping-An,REN Man-Nian,JIANG Dan.An experimental study on optimization utilization of deasphalted oil[J].Fuel Processing Technology,2012,99(7):64-68.
[2]REN Man-nian(任满年),DU Ping-an(杜平安),CAO Fa-hai(曹发海),et al.Novel method for obtaining concoction soft component of high-grade road asphalt(一种获得高等级道路沥青调合软组分的新方法):CN,101880548A[P].2010-11-10.
[3]ZHAO Zhen-hui(赵振辉),CAO Fa-hai(曹发海),REN Man-nian(任满年),et al.Heavy oil processing combined process capable of using deasphalted oil efficiently(一种高效利用脱沥青油的重油加工组合工艺):CN,101892074A[P].2010-11-24.
[4]DU Ping-an(杜平安).Combination technologies of bidirectional utilization of deasphalting oil(脱沥青油高效利用双向组合工艺研究)[D].Shanghai(上海):East China University of Science and Technology(华东理工大学),2011.
[5]JIANG Dan(姜丹).Research of deasphalted oils extraction process(脱沥青油溶剂抽提工艺的研究)[D].Shanghai(上海):East China University of Science and Technology(华东理工大学),2010.
[6]SHEN Ben-xian(沈本贤).Advanced separation engineering(高等分离工程)[M].Shanghai(上海):East China University of Science and Technology Press(华东理工大学出版社),2004.
[7]Grieken R V,Baudilio C,Espada J J.Prediction of liquid-liquid equilibrium in the system furfural+heavy neutral distillate lubricating oil[J].Industrial&Engineering Chemistry Research,2005,44(21):8106-8112.
[8]Baudilio C,Grieken R V,Peńa J,Espada J J.A generalized model to predict the liquid–liquid equilibrium in the systems furfural+lubricating oils[J].Chemical Engineering Science,2006,61(24):8028-8039.
[9]Grieken R V,Baudilio C,Espada J J.Application of a generalizedmodelto the estimation of physical properties and description of the aromatic extraction from a highly paraffinic lubricating oil[J].Chemical Engineering Science,2008,63(3):711-720.
[10]Espada J J,Baudilio C,Peňa J.Liquid-liquid equilibrium in the systems furfural+light lubricating oils using UNIFAC[J].Fluid Phase Equilibria,2007,259(2):201-209.
[11]Joaquim J.C.Aparicio,Manuel A.S.Jerónimo,Fernando G M.Two different approaches for RDC modeling when simulating a solvent deasphalting plant[J].Computers and Chemical Engineering,2002,26(10):1369-1377.
[12]CAO Fa-hai,JIANG Dan,LI Wu-dong,et al.Process analysis of the extract unit of vacuum residue through mixed C4 solvent for deasphalting[J].Chemical Engineering and Processing,2010,49(1):91-96.
[13]LI Wu-dong(李武东),DU Ping-an(杜平安),CAO Fa-hai(曹发海),et al.Simulation and optimization of the extract segment of solvent deasphalting plant(溶剂脱沥青抽提段的模拟与优化)[J].Computer and Applied Chemistry(China)(计算机与应用化学),2009,26(4):455-460.
[14]LI Wu-dong(李武东).Simulation and optimization of solvent deasphalt process and DAO refining technology(溶剂脱沥青过程和DAO精制工艺的模拟与优化)[D].Shanghai(上海):East China University of Science and Technology(华东理工大学),2009.
[15]DU Ping-An,REN Man-Nian,JIANG Dan.An experimental study on optimization utilization of deasphalted oil[J].Fuel Processing Technology,2012,99(7):64-68.