双进料混合二甲苯连续悬浮结晶工艺的优化  

Optimization of Xylol Continuous Suspension Crystallization Process with Two Separate Feed Streams

作　　者：吴俊[1] 黄民[1] 郭思斯[1] 王琰[1] 李佟茗[1] 孔德金[2] 

机构地区：[1]同济大学化学系,上海200092 [2]中国石油化工股份有限公司上海石油化工研究院,上海201208

出　　处：《高校化学工程学报》2010年第4期705-708,共4页Journal of Chemical Engineering of Chinese Universities

摘　　要：甲苯选择性歧化法与传统歧化组合工艺(简称SITDP工艺)得到对二甲苯(PX)含量为90%左右和65%左右的两种混合二甲苯产品,探索将SITDP工艺得到的两种不同浓度PX产品结合成一套分离提纯装置,研究进一步结晶提纯优化方案。通过二甲苯同分异构体三元系固液相平衡实验求取真实二甲苯固液相平衡的模型及数学表达式,结合物料衡算和能量衡算对双进料混合二甲苯连续悬浮结晶工艺进行计算,考察两种含量料液在不同进料比率下的单位质量产品最低能耗QR及其对应的成核区温度T2。计算结果得到最优成核温度的调节范围为248～265K,与实际生产操作工艺中的成核温度调节范围250～266K相当接近。计算结果同时提供了不同进料比率下为获得单位质量产品最低能耗QR时的最优成核区温度T2。A continuous suspension crystallization process with two different p-xylene （PX） concentration feeds was studied.The xylene isomers ternary solid-liquid phase equilibria were investigated and their mathematically expressed equations were derived.Combining with the calculations of material and energy balances,the continuous suspension crystallization process was optimized.The optimum crystal nucleation temperature range between 248～265 K was found,which agrees well with the industrial operation conditions.

关 键 词：混合二甲苯 对二甲苯 固-液相平衡 能耗 

分 类 号：TQ026.5[化学工程]