摘要
乙酸脱水是精对苯二甲酸生产过程中实现乙酸回收的一个重要的生产环节。文中从节能降耗角度出发,提出采用乙酸仲丁酯(SBA)作为乙酸脱水过程的萃取剂和共沸剂,替代传统工艺中使用乙酸异丁酯(IBA)溶剂。采用AspenPlus软件对江苏某石化企业的乙酸脱水单元进行模拟,分析采用SBA溶剂替代IBA的可行性,并对工艺过程进行系统的优化研究。稳态模拟分析结果表明:采用SBA作为乙酸脱水过程的萃取剂和共沸剂,在原有工艺参数基本不变的条件下,将乙酸脱水塔油相回流比从0.83调整至0.84,水相回流比从0.22调整至0.234,就可达到乙酸脱水系统的设计要求,同时节省蒸汽消耗2.71×10^4t/a,减少共沸剂损失578t/a。
Acetic acid dehydration system is an important unit to achieve acetic acid recovery in the production of PTA. In view of energy saving and consumption reduction, the use of sec-butyl acetate (SBA) as entrainer and extractant for the acetic acid dehydration process was proposed in this paper, to replace isobutyl acetate (IBA) solvent in traditional process. An acetic acid dehydration unit in petrochemical enterprises in Jiangsu Province was simulated by Aspen Plus. The feasibility of using SBA solvent instead of IBA was investigated, and the process was systematically optimized. The steady state results demonstrate that when SBA is used as extractant and entrainer, the design requirements of acetic acid hydration system can be satisfied through changing the oil phase reflux ratio from 0.83 to 0.84 and adjusting the aqueous phase reflux ratio from 0.22 to 0.234 with the other operating parameters unchanged. Under this condition, steam consumption can save 2.71×10^4 t/a and the loss of solvent can be reduced 578 t/a.
作者
冯立欣
黄智贤
FENG Li-xin;HUANG Zhi-xian(School of Chemical Engineering, Fuzhou University, Fuzhou 350116, Fujian Province, China)
出处
《化学工程》
CAS
CSCD
北大核心
2019年第7期63-67,72,共6页
Chemical Engineering(China)
基金
福建省自然科学基金资助项目(2017J01417)
关键词
乙酸脱水
乙酸仲丁酯
共沸精馏
模拟
优化
acetic acid dehydration
sec-butyl acetate
azeotropic distillstion
simulation
optimization
