带有动态侧线出料的热敏物料间歇精馏-化学工程专业论文.docxVIP

中文摘要 针对热敏物料的问歇精俑分离提纯问题，本文提出了用于提纯热敏物料的 带有动态侧线出料的提饱式间歇精馆过程，建立了适用于分离热敏物料的带有动 态侧线出料的提馆式间歇精馈数学模型，模型采用 Gear 法进行求解，并采用模 拟退火算法进行了优化计算。 通过模拟计算研究了塔顶贮罐温度、反应皮、蟠底再沸器持液量、侧线出 料位置等对带侧线出料的热敏物料间歇精偏过程的影响。通过模拟计算可知，当 塔顶贮罐料液维持在炮点状态时，塔顶贮罐内热敏反应最大，产品收事低，而当 塔顶贮罐内物料维持冷态进料时，可以大大减少塔顶贮罐内物料发生热敏反应的 可能性，提高产品收率:一般情况下，反应度越小，热敏物料的收率越南:踏底 再沸器持液盘磁低，热敏性产品的收率越高，因为低持液量可以大大减少热敏物 料在塔釜的停留时间，减少热敏损失嚣。在带侧钱出料的提馄式问歇精馆培中， 有一个最优的侧线出料位置，而最优出料位置与物料的相对挥发度有关。另外， 通过对带侧线动态出料的提馈式间歇精馆塔和精馈式间歇精锢墙的比较可以发 现z 不管产品在精铺过程中生成轻组分还是重组分，由于倒立培塔顶贮罐物料可 以保持冷态的优势，对于热敏物料的间歇精愧，带侧线出料提馆式问歇精俑塔优 于精馆式间歇精馆塔。 采用苯·甲苯.邻二甲苯体系进行了带有动态侧钱出料的提惰式间歇精馆过 程实验，对所建立的数学模型进行了实验验证，实验结果与模拟计算结果明合良 好。另外，还进行了带有直接接触传热燕发釜和动态侧线出料的提馈式间歇精馆 实验研究，该过和由于物料在塔釜停留时间饵，更荷利于热敏物料的分离。 关键词z 间歇精馆侧钱出料热敏物料模拟苯幡甲苯 邻工甲苯 ABSTRACT A batch distillation process with a side withdrawal for purification of heat sensitive material in batch stripper was proposed in this paper. A mathematic model for batch distillation with a side withdrawal for purification of heat sensitive material was established ，the model was solved by the Gear integration method and optimized by a simulated annealing algorithm. 叽le e仔ects of temperature of the top storage vessel，reaction rate，liquid holdup in ‘ reboiler and location of side withdrawal to batch distillation process were investigated 电 by the optimization results. When the feedstock in the ωp storage vessel is kept in bubble point， the thermal reaction in the top storage is large，but when the temperature in the top storage is kept in a cold state，thermallosses can be gre剖Iy reduced，and the recovery is greatly improved. Generally，the smaller reaction rate is，the higher the recovery of heat sensitive material is;ηle lower Iiquid holdup of bottom reboiler is， the higher the recove叩 of heat sensitive material is，because low liquid holdup can greatly reduce the residence time of heat sensitive material in the reboiler and reduce the thermalloss. In the batch stripper with a side withdrawal ，there is an optimal sid