摘要
基于对废弃酯类合成润滑油的氧化变质成分分析,利用化工流程模拟软件(Aspen Plus)模拟出一种高效分离和回收酯类合成润滑油的工艺。逆流双效精馏分离回收工艺中,液相的非理想性计算采用热力学活度系数模型(NRTL);气相模型采用热力学状态方程(SRK)、蒸汽表状态方程(STEAMNBS),其中,热力学状态方程和蒸汽表状态方程二元相互作用参数由气液相平衡(VLE)数据回归。在变压逆流双效精馏模型中,通过合理调整撕裂流股并为其赋予初值,使循环物料计算收敛。优化分析常压塔(T1)和加压塔(T2)的理论塔板数、进料位置及常压塔(T1)和加压塔(T2)回流比对分离效果的影响。结果表明:将工艺参数设定为常压塔(T1)理论塔板数7块,进料位置在第3块塔板,回流比9.8,塔顶温度221℃,全塔压力100kPa;加压塔(T2)理论塔板数7块,进料位置在第1块塔板,回流进料板数为7块,回流比4.6,塔顶温度293℃,全塔压力150kPa,分离得到的润滑油癸二酸二异辛酯产品质量分数为99.101%,回收率99.587%;与单效精馏相比,逆流双效精馏工艺能耗较低,再沸器和冷凝器热负荷分别降低16.6%和14.5%。
A highly efficient process of separating and recovering ester synthetic lubricating oil is simulated by Aspen Plus based on the analysis of oxidative metamorphic components of ester synthetic lubricating oil.The non-ideality calculation of the liquid phase used the thermodynamic activity coefficient model(NRTL),while the gas phase model used the thermodynamic equation of state(SRK)and the steam table equation(STEAMNBS),whose binary interaction parameters were determined by gas-liquid equilibrium(VLE)Data regression.The circulating material calculation was converged by rationally adjusting the tearing streams and giving it an initial value in the pressure-swing countercurrent double-effect distillation model.The effects of theoretical plate numbers,feed position and reflux ratio of atmospheric tower and pressure tower were optimized and analyzed on separation efficiency.The results showed that diisooctyl sebacate lubricating oil with mass fraction of 99.101% and a recovery rate of 99.587% were obtained when the process parameters of T1 are 7 theoretical plates,the position of feed plate is the third plate,the reflux ratio is 9.8,the temperature at the top of the tower is 221℃,the tower pressure is 100 kPa,parameters of T2 are 7 theoretical plates,the position of feed plates is the first plate,the position of reflux feed plate is seventh plate,the reflux ratio is 4.6,the temperature at the top of the tower is 293℃,and the tower pressure is 150 kPa.Variable pressure countercurrent double-effect rectification process has lower energy consumption,the thermal load of rboiler and condenser decreased by 16.6% and 14.5% respectively.
作者
张宏坤
左茂晟
李琳
Zhang Hongkun;Zuo Maocheng;Li Lin(School Engineering of Food,Harbin University,Harbin,Heilongjiang 150086,China)
出处
《化学世界》
CAS
CSCD
2020年第6期447-453,共7页
Chemical World
基金
黑龙江省自然科学基金(No.JJ2019LH0021)
哈尔滨学院青年博士科研启动基金(No.HUDF2017211)和哈尔滨学院大学生科技创新(No.HXS2018015)资助项目。
关键词
润滑油
化工流程模拟软件
变压逆流双效精馏
节能
lubricating oil
Aspen Plus
pressure-swing countercurrent double-effect distillation
energy-saving
