Extraction of tar acids with glycols

Tiwari, Kaushal K.

doi:10.1016/0378-3820(91)90081-m

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…4 An alternative process in which aqueous ethylene, diethylene, and triethylene glycol are contacted with a distilled tar fraction before washing with a light petroleum ether has also been investigated. 8 In this investigation it was concluded that 80% aqueous ethylene glycol was the optimum solvent with respect to phenolic recovery and product purity. The product purities obtained were however very low, with values ranging from 82 to 93%.…”

Section: Introductionmentioning

confidence: 90%

“…The nonpolar solvents most commonly used are hexane, heptane, petroleum ether, diesel, and various nonaromatic naphthas . An alternative process in which aqueous ethylene, diethylene, and triethylene glycol are contacted with a distilled tar fraction before washing with a light petroleum ether has also been investigated . In this investigation it was concluded that 80% aqueous ethylene glycol was the optimum solvent with respect to phenolic recovery and product purity.…”

Section: Introductionmentioning

confidence: 99%

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Liquid−Liquid Equilibria for Phenolic Compounds, Neutral Oils, and Nitrogen Bases at 313.15 K

Venter

Nieuwoudt

2001

J. Chem. Eng. Data

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Liquid−liquid extraction with triethylene glycol as solvent, water as cosolvent, and hexane as countersolvent is being investigated as a process for the separation of phenolic compounds from neutral oils and nitrogen bases. To this end, liquid−liquid equilibria at 313.15 K and atmospheric pressure have been determined for the systems triethylene glycol + hexane + water + (phenol + aniline + benzonitrile + 5-ethyl-2-methyl pyridine + mesitylene) or (m-cresol + o-tolunitrile + o-toluidine + indene + pseudocumene + undecane) or (2,4-xylenol + 3,4-xylenol + 3,5-xylenol + indane + naphthalene + dodecane). From the experimental results it is concluded that triethylene glycol, hexane, and water are effective solvents for the separation of phenolic compounds from neutral oils and nitrogen bases by means of liquid−liquid extraction. LLE binary parameters for the NRTL equation were obtained for each of the three systems by regression of the equilibrium data. The NRTL equation fit the experimental data with a root-mean-square-deviation (RMSD) of 0.0037, 0.0100, and 0.0058 for the systems containing phenol, m-cresol, and the xylenol isomers, respectively.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Liquid−Liquid Equilibria for Phenolic Compounds, Neutral Oils, and Nitrogen Bases at 313.15 K

Venter

Nieuwoudt

2001

J. Chem. Eng. Data

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“…However, the alkali washing method has some obvious drawbacks, including easy emulsification, equipment corrosion problems and serious pollution (Liu and Qang 2001;Jia and Jia 2008;Ye et al 2010;Wang et al 2011). The solvent extraction method is based on the polarity property of phenol, which will be the developing direction of extraction phenol from coal tar, and it has many advantages, such as low price, nontoxic extraction agent, corrosion-free, moderate operation conditions, no waste water and no exhaust gas in the course of production (Tiwari and Sen 1991;Wu et al 2001;Liu and Xie 2014). The extraction method has been used in industry (Zong et al 2013), yet the most adopted solvent extraction equipment is the mixer-settler, which have obvious disadvantages of large liquid holdup, significant solvent loss, long mixing and refining time, large land occupied and only intermittent operation.…”

Section: Introductionmentioning

confidence: 99%

Study on extraction phenol from coal tar with high flux centrifugal extractor

Zhao

Mao

et al. 2017

Int J Coal Sci Technol

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Solvent extraction phenol from coal tar were carried out with novel composite YH-3 as extraction agent, and the high flux centrifugal extractor was used as extraction device. Under the premise of high phenol extraction rate, composite YH-3 extraction agent reduces p-p interaction between phenolic compounds and aromatic hydrocarbons, thus decreasing the entrainment of neutral oil. The optimization of operation conditions, such as the diameter of heavy phase weir HWD, the flow ratio, the total flow rate and the rotation speed, are necessary. For single stage extraction experiment, the mass transfer efficiency was up to 84% while the rate of extraction agent loss was lower than 0.28% with the operation conditions of 29 mm of the heavy phase weir diameter (HWD), 1:1-1.4:1 of the flow ratio range, 160-200 mL/min of the total flow rate and the rotation speed varied from 2200 to 2600 r/min. For three stage counter-current test, the mass transfer efficiency reached up to 92.6% with the optimum operation condition of 29 mm of the HWD, 1:1 of the flow ratio, 200 mL/min of the total flow rate and 2400 r/min of the rotation speed. The results indicated that phenol could be extracted effectively from coal tar in the process of multistage continuous count current centrifugal extraction.

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