Treatment of Sebacic Acid Industrial Wastewater by Extraction Process Using Castor Oil Acid as Extractant

doi:10.1016/S1004-9541(13)60546-7

Chin.J.Chem.Eng. ›› 2013, Vol. 21 ›› Issue (9): 967-973.DOI: 10.1016/S1004-9541(13)60546-7

• SEPARATION SCIENCE AND ENGINEERING • Previous Articles Next Articles

Treatment of Sebacic Acid Industrial Wastewater by Extraction Process Using Castor Oil Acid as Extractant

XU Hang^1,2, ZHOU Quan², WANG Jinfu²

1 Chemical Engineering and Pharmaceutics School, Henan University of Science and Technology, Luoyang 471023, China;
2 Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

Received:2012-02-14 Revised:2012-11-26 Online:2013-10-01 Published:2013-09-28
Contact: WANG Jinfu
Supported by:
Supported by the National Natural Science Foundation of China (21006057) and the National Science Foundation for Post-doctoral Scientists of China (20100470351)

Treatment of Sebacic Acid Industrial Wastewater by Extraction Process Using Castor Oil Acid as Extractant

徐航^1,2, 周全², 王金福²

1 Chemical Engineering and Pharmaceutics School, Henan University of Science and Technology, Luoyang 471023, China;
2 Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

通讯作者: WANG Jinfu
基金资助:
Supported by the National Natural Science Foundation of China (21006057) and the National Science Foundation for Post-doctoral Scientists of China (20100470351)

Abstract

Abstract: Wastewater containing high concentrations of phenol and sodium sulfate is generated in sebacic acid (SA) industry. Castor oil acid, a raw material for producing SA, can be used to extract phenol from wastewater in order to reduce the amount of phenol used in the process and discharge of phenol. The results show that the extraction mechanism is that hydroxyl group of phenol is linked to carboxyl group of castor oil acid by hydrogen bond. The extraction process approaches equilibrium in 30 min. Extraction ratio increases with the increase of sodium sulfate and castor oil acid, and decreases as phenol increases. When the oil-water ratio is 1:3, the optimal distribution coefficient of 40 is obtained. Phenol saturation concentration in castor oil acid is 1.03 mol·L^-1 after extraction for 4 times. The equilibrium constant (K_ex) at 25℃ is 8.41 and the endothermic enthalpy (ΔH) is 1.513 kJ·mol^-1. The Gibbs free energy (ΔG) is -5.277 kJ·mol^-1 and the value of ΔS is calculated to be 22.3 J·mol^-1·K^-1.

Key words: castor oil acid, wastewater, extraction, phenol, sodium sulfate

摘要： Wastewater containing high concentrations of phenol and sodium sulfate is generated in sebacic acid (SA) industry. Castor oil acid, a raw material for producing SA, can be used to extract phenol from wastewater in order to reduce the amount of phenol used in the process and discharge of phenol. The results show that the extraction mechanism is that hydroxyl group of phenol is linked to carboxyl group of castor oil acid by hydrogen bond. The extraction process approaches equilibrium in 30 min. Extraction ratio increases with the increase of sodium sulfate and castor oil acid, and decreases as phenol increases. When the oil-water ratio is 1:3, the optimal distribution coefficient of 40 is obtained. Phenol saturation concentration in castor oil acid is 1.03 mol·L^-1 after extraction for 4 times. The equilibrium constant (K_ex) at 25℃ is 8.41 and the endothermic enthalpy (ΔH) is 1.513 kJ·mol^-1. The Gibbs free energy (ΔG) is -5.277 kJ·mol^-1 and the value of ΔS is calculated to be 22.3 J·mol^-1·K^-1.

关键词: castor oil acid, wastewater, extraction, phenol, sodium sulfate

XU Hang, ZHOU Quan, WANG Jinfu. Treatment of Sebacic Acid Industrial Wastewater by Extraction Process Using Castor Oil Acid as Extractant[J]. Chin.J.Chem.Eng., 2013, 21(9): 967-973.

徐航, 周全, 王金福. Treatment of Sebacic Acid Industrial Wastewater by Extraction Process Using Castor Oil Acid as Extractant[J]. Chinese Journal of Chemical Engineering, 2013, 21(9): 967-973.

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Treatment of Sebacic Acid Industrial Wastewater by Extraction Process Using Castor Oil Acid as Extractant

Treatment of Sebacic Acid Industrial Wastewater by Extraction Process Using Castor Oil Acid as Extractant

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