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On-line Access: 2016-10-08

Received: 2015-10-23

Revision Accepted: 2016-03-05

Crosschecked: 2016-09-23

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Citations:  Bibtex RefMan EndNote GB/T7714


Qing-ran Kong


Xi Li


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Journal of Zhejiang University SCIENCE A 2016 Vol.17 No.10 P.828-840


Non-dispersive solvent extraction of p-toluic acid from purified terephthalic acid plant wastewater with p-xylene as extractant

Author(s):  Qing-ran Kong, You-wei Cheng, Li-jun Wang, Xi Li

Affiliation(s):  College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   lixi@zju.edu.cn

Key Words:  Non-dispersive solvent extraction (NDSE), Purified terephthalic acid (PTA) wastewater, p-toluic (PT) acid, p-xylene (PX), Mass transfer

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Qing-ran Kong, You-wei Cheng, Li-jun Wang, Xi Li. Non-dispersive solvent extraction of p-toluic acid from purified terephthalic acid plant wastewater with p-xylene as extractant[J]. Journal of Zhejiang University Science A, 2016, 17(10): 828-840.

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author="Qing-ran Kong, You-wei Cheng, Li-jun Wang, Xi Li",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Non-dispersive solvent extraction of p-toluic acid from purified terephthalic acid plant wastewater with p-xylene as extractant
%A Qing-ran Kong
%A You-wei Cheng
%A Li-jun Wang
%A Xi Li
%J Journal of Zhejiang University SCIENCE A
%V 17
%N 10
%P 828-840
%@ 1673-565X
%D 2016
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1500281

T1 - Non-dispersive solvent extraction of p-toluic acid from purified terephthalic acid plant wastewater with p-xylene as extractant
A1 - Qing-ran Kong
A1 - You-wei Cheng
A1 - Li-jun Wang
A1 - Xi Li
J0 - Journal of Zhejiang University Science A
VL - 17
IS - 10
SP - 828
EP - 840
%@ 1673-565X
Y1 - 2016
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1500281

non-dispersive solvent extraction (NDSE) with p-xylene as extractant was employed as a novel separation method to recover both p-toluic (PT) acid and water from purified terephthalic acid (PTA) wastewater. The mass transport behavior of PT acid from aqueous solution to p-xylene was investigated by experiments and numerical simulation. Experiments showed that NDSE is feasible and effective. Residual PT acid in the raffinate can be reduced to lower than the permitted limit of wastewater re-use (100 g/m3) with extraction time longer than 60 s in industrial conditions. A mathematical model of PT acid mass transport was developed to optimize the membrane module performance. The model was validated with the experimental results with relative errors of less than 6%. Numerical analysis for mass transfer through the lumen side, the porous membrane layer, and the shell side showed that PT acid transport in the aqueous solution is the rate determining step. The effects of the membrane and operating parameters on membrane module performance were investigated by means of computational simulations. The key parameters suggested for industrial NDSE design are: fiber inner radius r1=200–250 μm, extraction time te=50–60 s, aqueous/ organic volumetric ratio a/o=9.0, and temperature T=318 K.

The manuscript is well documented and the study has relevance. Experiments on extraction have been conducted and the results have been explained through mathematical modeling.


创新点:1. 采用非分散相溶剂萃取有效地实现了工业条件下PTA废水的净化和资源的回收利用;2. 采用数学模拟优化工业萃取的操作参数。
方法:1. 进行对二甲苯萃取实验,考察操作条件对萃取效率和萃余水杂质浓度的影响;2. 通过数学模拟,建立膜萃取过程的数学模型,对操作参数与膜结构参数进行敏感性分析。
结论:1. 非分散相溶剂萃取可以有效解决PTA工业废水的回收利用问题;2. 质量传递的速率控制步骤是管程中的水相扩散;3. 优化的工业操作条件为:中空纤维膜内径为200~250 μm,萃取时间为50~60 s,水油两相体积比为9.0,萃取温度为318 K。


Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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