摘要
采用NRTL方程和UNIFAC模型计算N-甲基吡咯烷酮(NMP)-C4物系的汽液平衡数据,由实验数据回归得到NRTL方程的二元交互作用参数。采用AspenPlus流程模拟软件对NMP法萃取精馏分离C4馏分中1,3-丁二烯的萃取精馏塔进行模拟,模拟结果与实验结果的相对误差小于10%,表明萃取精馏塔的数学模型可靠。考察了回流比、溶剂比(溶剂NMP与进料C4的质量比)、理论板数等因素对分离1,3-丁二烯的影响。模拟结果表明,萃取精馏塔的最佳工艺条件为:理论板数70～80块,原料进料位置为第48～52块理论板,溶剂比12,回流比0.5～1.0,溶剂进料温度40～50℃,塔顶采出量0.150～0.155kg/h。
The vapor-liquid equilibrium model of extractive distillation with N-methylpyrrolidone （NMP） as extractant for separating 1,3-butadiene from C4 fraction were set up by using NRTL equation and UNIFAC group model. With regard to the model and experimental data, process of separation of C4 fraction with NMP was optimized by Aspen Plus process simulating software. The optimization results were compared with experiment data,the error is within 10%. The model is considered to be reliable. Effects of column trays, reflux ratio, extractant ratio （mass ratio of NMP to feed C4 ） on separation were under observation. The optimized process parameters are as follows：theoretical tray number 70 - 80, feed tray 48 - 52th tray, extractant ratio 12, reflux ratio 0.5 - 1.0, feed input temperature 40 - 50℃ and top product output 0. 150 -0. 155 kg/h.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2008年第3期253-257,共5页
Petrochemical Technology
