二元塔顶累积全回流间歇精馏塔最少理论板数的近似计算  

Minimum Theoretical Trays for Binary Batch Distillation Under Total Reflux and Top Accumulation

作　　者：王为国[1] 曾真[2] 王存文[3] 吴元欣[3] 

机构地区：[1]武汉工程大学化工与制药学院,湖北武汉430073 [2]武汉工程大学机电工程学院,湖北武汉430073 [3]武汉工程大学绿色化工过程教育部重点实验室,湖北武汉430073

出　　处：《石油化工》2011年第11期1205-1210,共6页Petrochemical Technology

摘　　要：分析了二元塔顶累积全回流间歇精馏理论塔板数对塔顶产品中轻组分极限浓度的影响,得到当塔釜内的存液量超过一块理论板上的持液量时,塔顶产品中轻组分的极限浓度随理论塔板数的增加而提高;推导出二元塔顶累积全回流间歇精馏塔最少理论塔板数的近似计算公式并进行了经验修正,近似计算公式中最少理论塔板数为塔板持液量的显函数。对近似计算公式的验证结果表明,近似计算公式具有普适性,在塔板持液量较小时或塔板持液量较大但所需最少理论塔板数较多时,近似计算的最少理论塔板数与精确计算的最少理论塔板数的相对偏差小于1%。The effect of theoretical tray number on the limiting concentration of the light components in the top products in binary batch distillation under total reflux and top accumulation was investigated.It was concluded that the limiting concentration of the light components in the top products increased with the increase of the theoretical tray number when the liquid hold-up in the reboiler was more than the liquid hold-up on a theoretical tray.The approximate calculation formula for the minimum theoretical tray number in the binary batch distillation under total reflux and top accumulation was deduced and was modified empirically.The minimum theoretical tray number in the approximate calculation formula is a explicit function of the liquid hold-up on a theoretical tray.The verification of the approximate calculation formula indicated its universality.The relative deviation between the minimum theoretical tray numbers obtained by approximate and accurate calculations is less than 1% when the liquid hold-up on a tray is little or the liquid hold-up is much but the minimum theoretical tray number is large.

关 键 词：间歇精馏 塔顶累积全回流 极限浓度 最少理论塔板数 

分 类 号：TQ015[化学工程]