多级萃取回收精对苯二甲酸精制废水中对甲基苯甲酸的模拟研究  

Simulation of Multistage Extraction to Recover p-Toluic Acid from Pure Terephthalic Acid Refined Wastewater

作　　者：殷孝谦 何摇岳 Yin Xiaoqian;He Yaoyue(Sinopec Yizheng Chemical Fibre Co.,Ltd.,Yizheng 211900,China;Faculty of Information Technology,Macao University of Science and Technology,Macao 999078,China)

机构地区：[1]中国石化仪征化纤有限责任公司,江苏仪征211900 [2]澳门科技大学资讯科技学院,澳门999078

出　　处：《南京师范大学学报（工程技术版）》2021年第3期56-61,共6页Journal of Nanjing Normal University(Engineering and Technology Edition)

摘　　要：对苯二甲酸精制过程中会产生大量的废水,该废水中含有一定量的对甲基苯甲酸、对苯二甲酸及苯甲酸等有机物.针对主要成分对甲基苯甲酸,提出了多级连续逆流萃取回收工艺方案,应用Aspen Plus过程模拟软件对水-对甲基苯甲酸-对二甲苯体系进行二元交互参数回归,并对单级萃取进行模拟计算.实验证明,模拟值与实验值吻合度较高,模型准确可靠.应用灵敏度分析研究了萃取级数、萃取剂用量及温度等因素对多级连续逆流萃取工艺的影响,在常压、30 000 kg/h处理量、对甲基苯甲酸含量350 mg/kg的废水工况下,确定了较优的工艺条件:萃取级数为六级、萃取剂用量为4 500 kg/h、温度为常温,此时处理后废水中对甲基苯甲酸含量可降至0.66 mg/kg,回收率接近100%,对二甲苯夹带量为9.4 mg/kg,同时处理后废水中对苯二甲酸及苯甲酸含量均有所降低.A large amount of waste water is produced during the refining process of terephthalic acid,which contains a certain amount of organic matters,such as p-Toluic acid,terephthalic acid and benzoic acid.The process of multistage continuous countercurrent extraction to recover p-Toluic acid(main component)from pure terephthalic acid refined wastewater is proposed.Aspen Plus process simulation software is used to regress binary interaction parameters of the water-p-Toluic acid-p-xylene system.The influence of key factors,such as extraction stages,extractant dosage and tempera-ture,on the multistage continuous countercurrent process are studied by using sensitivity analysis tools.The optimum process conditions are determined under the conditions of normal pressure,30000 kg/h treatment amount,PT acid content 350 mg/kg.The optimum extraction stages:6,extractant dosage:4500 kg/h,temperature:normal temperature,in which case,the PT acid content in the treated wastewater can be reduced from 350 mg/kg to 0.66 mg/kg,the recovery rate of PT acid is close to 100%,the entrainment quantity of PX is 9.4 mg/kg,and the terephthalic acid and benzoic acid content is also reduced.

关 键 词：模拟 建模 精对苯二甲酸精制废水 对甲基苯甲酸 萃取 

分 类 号：TQ028.4[化学工程]