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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。
Toluene selective disproportionation and traditional disproportionation combined process (referred to as SITDP process) to get p-xylene (PX) content of about 90% and about 65% of the two mixed xylene products to explore the SITDP process obtained two different concentrations of PX Products combined into a set of separation and purification device, to study further crystallization purification optimization program. Through the xylene isomer ternary system solid-liquid equilibrium experiment to get real xylene solid-liquid equilibrium model and mathematical expression, combined with the material balance and energy balance of double feed mixed xylene continuous suspension crystallization Process calculations were conducted to investigate the minimum energy consumption per unit mass of product QR and its corresponding nucleation zone temperature T2 for two feed stocks at different feed ratios. The calculated optimum nucleation temperature is in the range of 248-265 K, which is quite close to the nucleation temperature range of 250-266 K in the actual production and operation process. The calculation results also provide the optimal nucleation zone temperature T2 for obtaining the minimum energy consumption QR of unit mass products at different feed ratios.