Investigation of Extraction of Phenol from Wastewater UsingN,N-Didodecyl-1-dodecanamine (Tridodecylamine) in Benzene

Abstract

Tridodecylamine (TDDA) is used as an extractant in benzene for the separation of phenol from the aqueous streams generated from industrial effluents. The effects of aqueous solution pH (at five different pH values, 3 to 11) and concentration of TDDA (at three different compositions, 100 w = 5 to 100 w = 20) in the organic phase are investigated on the distribution coefficient (D). Results show that the neutral phenol molecule is effectively extracted by TDDA into the organic phase by H-bonding. A maximum value of D (5.027, 83.41 %E) is observed at equilibrium pH of 5 and at highest concentration of TDDA (100 w = 20). A mathematical expression for equilibrium D is proposed based on the mass action law, and the apparent equilibrium constants (K) and the stoichiometric coefficient (n) are estimated from the regression of the experimental data. The K and n are found to be 10.17 and 0.60, respectively, at pH of 5. The D values are also predicted and show a good agreement with R 2 > 0.99 and SD < 0.0141.

Removal of Phenol from Sour Water by Poly(vinyl Alcohol)/Polyamide‐Reverse Osmosis Membranes

“…These concerns have led national and international environmental regulators to establish stricter limit values for discharges [6], encouraging implementation and the development of efficient treatments and more sustainable practices. [7]. The concentration of phenol in wastewater (called before treatment sour water [8]) is from 0.1 to 80 000 mg L -1 [9].…”

Extraction Equilibria of Glycolic Acid Using Tertiary Amines: Experimental Data and Theoretical Predictions

“…Several recovery processes are used for the recovery of carboxylic acids from their aqueous solutions such as ion exchange chromatography, , adsorption, − electrodialysis, , anion exchange, , liquid–liquid extraction, , membrane separation, , ultrafiltration, nanofiltration, reverse osmosis, distillation, , precipitation, , and reactive extraction. − Among the studied techniques, reactive liquid–liquid extraction has gained attention as a promising method for the recovery of carboxylic acids from a dilute fermentation broth. Compared with other recovery methods, reactive liquid–liquid extraction is expected to require less energy input, provide higher yields and selectivity, and facilitate the establishment of closed-loop processes. − Although tertiary amines such as trioctylamine (TOA) − , or tridodecylamine (TDA) − dissolved in some diluents were used actively in the recovery of different organic acids with higher distribution coefficients, there is a lack of knowledge concerning the effect of mixed-amine extractant on the recovery of carboxylic acids, especially glycolic acid. However, a mixture of two different amines was chosen since they have a high affinity and extraction capability for carboxylic acids as obvious from a recent study .…”