Novel method of recovering phenolic substances from aqueous alkaline waste streams

Abstract

A novel two-phase method has been proposed to remove as well as to recover phenolic materials from aqueous alkaline waste streams. This is based on the reaction of phenolic materials with substances such as benzoyl chloride, p -toluenesulfonyl chloride, etc. dissolved in a water-immiscible solvent such as toluene in the presence of a phase transfer catalyst. In a continuous reactor-settler arrangement it was possible to bring down the phenol content of an aqueous alkaline stream from 2035 ppm to 45 ppm with phenol recovered as phenyl benzoate. Won, K. W.; Prausnitz, J. M. J . Chem. Thermodyn. 1975, 7 , 661.

Effect of phase transfer catalysts on the interfacial tension of water/toluene system

“…The interfacial tension is always lower for aliquat-336 than HTPB at a given concentration and thus the RA a value for a given reaction under otherwise identical conditions is expected to be higher for aliquat-336 than HTPB. Indeed the higher RA a value is observed in case of aliquat-336 (Krishnakumar and Sharma, 1984) than HTPB (Dutta et al, 1992) for the reaction between benzoyl chloride and phenol to phenyl benzoate, under two phase condition. However, one must be cautious in interpreting the results with surfactant PTC in terms of increased interfacial area above its CMC (Lele et al, 1983).…”

“…In this communication we report the data on IFT of tricaprylmethyl ammonium chloride (aliquat-336), hexadecyltributyl phosphonium bromide (HTPB) , hexadecyltrimethyl ammonium chloride (HTMAC) and hexadecyltrimethyl ammonium bromide (HTMAB) at water/toluene interface at 25°C. The above PTCs are effective in converting phenolics in alkaline water to useful product (Krishnakumar and Sharma, 1984;Dutta et al, 1992). The effect on IFT of phenol in aqueous alkaline phase in the presence of aliquat-336 is also reported.…”

Synthesis and performance of a novel polyurethaneurea as pervaporation membrane for the selective removal of phenol from industrial waste water

“…Phenols and other aromatic hydroxy-compounds are common pollutants often found in wastewater streams of petroleum refineries and petrochemical industries (Mancy and Weber 1971). Separation of phenol from industrial waste stream has gathered significant interest over past few decades (Krishnakumar and Sharma 1984). Some important methods regarding recovery of phenols include solvent extraction (Ge and Jin 1996), activated carbon and polymer adsorption (Cook et al 1975;Bercie et al 1996), and membrane processes (Uramoto et al 1991;Ray et al 1997).…”

A novel process for recovery of phenol from alkaline wastewater: laboratory study and predesign cost estimate

“…tions can be used to provide the basis of a novel process for treatment of phenolic wastewater; this process may be attractive when the phenolic content is more than 2 000 mg/L (Krishnakumar and Sharma, 1984). The disadvantages of homogeneous phase-transfer-catalyzed reactions and advantages of supported phase transfer catalysts have been discussed in previous publications (Dutta et at., 1992a and1992b).…”