【摘要】 为了开发节能、低耗、绿色清洁的精对苯二甲酸(PTA)生产工艺,在传统PTA生产工艺以及利用反应热进行精馏脱水的氧化-精馏集成工艺基础上,提出了氧化-多级精馏耦合工艺,并采用ASPEN PLUS软件建立并模拟了三种PTA氧化与精馏脱水工艺方案。模拟结果表明,直接利用反应热作为精馏热源,实现氧化-精馏耦合操作,大幅降低了精馏能耗,与传统工艺比较,脱水能耗下降76%;使用精制母液作为脱水塔回流,去离子水消耗降低65%,对二甲苯(PX)物耗减少1.65 kg/t-PTA。在此基础上,提出了多级精馏的优化工艺,实现了溶剂的进一步高效利用,模拟分析表明优化工艺可进一步降低醋酸消耗0.32 kg/t-PTA,废水量进一步减少64%。说明氧化-多级精馏耦合操作的工艺流程是一种节能、减排、低耗的PTA新型工艺技术。更多还原

【Abstract】 To develop energy-saving, low consumption, green and clean production process of purified terephthalic acid(PTA), a coupling process of oxidation-multistage distillation was proposed based on the traditional PTA production process and distillation dehydration oxidation-distillation process using reaction heat. Three different integrated PX oxidation and distillation dehydration process schemes were established and simulated by using ASPEN PLUS software. Simulation results showed that the oxidation-dehydration coupling process directly using the reaction heat as the rectification heat source, and the refined mother liquor as the dehydration tower reflux could greatly reduce the consumption of dehydration energy, deionized water and raw material. Compared with the traditional process, the dehydration energy consumption was reduced by 76%, deionized water was decreased by 65% and PX usage was reduced by 1.65 kg/t-PTA. On this basis, an optimized multi-stage distillation process was proposed to utilize acetic acid solvents of different concentrations from the dehydration process. Calculation results showed that the new process could further reduce the consumption of acetic acid by 0.32 kg/t-PTA and wastewater by 64%. The oxidation-multistage distillation coupling process may be promising for PTA production with energy-saving, and emission reduction.更多还原