计算机与应用化学
計算機與應用化學
계산궤여응용화학
COMPUTERS AND APPLIED CHEMISTRY
2013年
7期
818-822
,共5页
杨金杯%余美琼%陈玉成%陈文韬
楊金杯%餘美瓊%陳玉成%陳文韜
양금배%여미경%진옥성%진문도
甲缩醛%甲醇%Aspen Plus%热集成%变压精馏
甲縮醛%甲醇%Aspen Plus%熱集成%變壓精餾
갑축철%갑순%Aspen Plus%열집성%변압정류
methylal%methanol%Aspen Plus%heat-integrated%pressure swing distillation
在分析甲缩醛和甲醇二元体系共沸特性基础上,提出热集成变压精馏分离甲缩醛和甲醇共沸体系的工艺方法。利用Aspen Plus软件对该分离过程进行模拟计算,采用NRTL方程作为物性计算模型,其二元交互作用参数由汽液相平衡数据回归,详细分析了加压塔和常压塔的理论板数、进料位置和回流比对分离过程的影响,并进行能耗比较。结果表明,采用热集成变压精馏分离工艺,可很好地实现甲缩醛与甲醇的分离,较佳的操作条件为:加压塔操作压力1.0 MPa,理论板数28,第18块板进料,回流比3.2,塔釜甲缩醛含量可达99.9%;常压塔操作压力0.1 MPa,理论板数24,第14块板进料,回流比2.6,塔釜甲醇含量可达99.5%。与常规变压精馏相比较,热集成变压精馏可节省能耗达35.5%,为共沸物分离过程的设计和改造提供依据。
在分析甲縮醛和甲醇二元體繫共沸特性基礎上,提齣熱集成變壓精餾分離甲縮醛和甲醇共沸體繫的工藝方法。利用Aspen Plus軟件對該分離過程進行模擬計算,採用NRTL方程作為物性計算模型,其二元交互作用參數由汽液相平衡數據迴歸,詳細分析瞭加壓塔和常壓塔的理論闆數、進料位置和迴流比對分離過程的影響,併進行能耗比較。結果錶明,採用熱集成變壓精餾分離工藝,可很好地實現甲縮醛與甲醇的分離,較佳的操作條件為:加壓塔操作壓力1.0 MPa,理論闆數28,第18塊闆進料,迴流比3.2,塔釜甲縮醛含量可達99.9%;常壓塔操作壓力0.1 MPa,理論闆數24,第14塊闆進料,迴流比2.6,塔釜甲醇含量可達99.5%。與常規變壓精餾相比較,熱集成變壓精餾可節省能耗達35.5%,為共沸物分離過程的設計和改造提供依據。
재분석갑축철화갑순이원체계공비특성기출상,제출열집성변압정류분리갑축철화갑순공비체계적공예방법。이용Aspen Plus연건대해분리과정진행모의계산,채용NRTL방정작위물성계산모형,기이원교호작용삼수유기액상평형수거회귀,상세분석료가압탑화상압탑적이론판수、진료위치화회류비대분리과정적영향,병진행능모비교。결과표명,채용열집성변압정류분리공예,가흔호지실현갑축철여갑순적분리,교가적조작조건위:가압탑조작압력1.0 MPa,이론판수28,제18괴판진료,회류비3.2,탑부갑축철함량가체99.9%;상압탑조작압력0.1 MPa,이론판수24,제14괴판진료,회류비2.6,탑부갑순함량가체99.5%。여상규변압정류상비교,열집성변압정류가절성능모체35.5%,위공비물분리과정적설계화개조제공의거。
Heat-integrated pressure swing distillation for separating a homogeneous azeotropic mixture composed of methylal and methanol was developed based on the dependency of the azeotropic composition on the system pressure. The Aspen Plus was used to simulate the separation process, using NRTL activity coefficient equation as the physical model, and the NRTL binary interaction parameters for methylal and methanol were correlated by experimental VLE data. The effect of theory stage, feed location and reflux ratio were detailed analyzed. The results shown that the methylal and methanol could be high efficiently separated by heat-integrated pressure swing distillation, the optimal condition: for high pressure tower, the pressure 1.0 MPa, theory plates 28, the 18th plate as feed plate, reflux ratio 3.2, and the purity of methylal of 99.9%at the bottom of tower;for atmospheric pressure tower, the pressure 0.1 MPa, theory plates 24, the 14th plate as feed plate, reflux ratio 2.6, and the purity of methanol of 99.5%at the bottom of tower. The heat-integrated pressure swing distillation could save energy consumption by 35.5%, compared to the conventional pressure swing distillation, thus realizing a remarkable energy-saving. The results could be provided for the design and improvement of the separation of azeotropic system.