|Table of Contents|

Simulation of Multistage Extraction to Recover p-Toluic Acidfrom Pure Terephthalic Acid Refined Wastewater(PDF)

南京师范大学学报（工程技术版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2021年03期
Page:
56-61
Research Field:
化学工程与技术
Publishing date:

Info

Title:
Simulation of Multistage Extraction to Recover p-Toluic Acidfrom Pure Terephthalic Acid Refined Wastewater
Author(s):
Yin Xiaoqian1; He Yaoyue2
(1.Sinopec Yizheng Chemical Fibre Co.,Ltd.,Yizheng 211900,China)(2.Faculty of Information Technology,Macau University of Science and Technology,Macau 999078,China)
Keywords:
simulation; modeling; pure terephthalic acid refined wastewater; p-Toluic acid; extraction
PACS:
TQ028.4
DOI:
10.3969/j.issn.1672-1292.2021.03.008
Abstract:
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 temperature,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,30 000 kg/h treatment amount,PT acid content 350 mg/kg. The optimum extraction stages:6,extractant dosage:4 500 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.

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Last Update: 2021-09-30