Phase Equilibrium on Extraction Methylphenols from Aqueous Solution with 3,3-Dimethyl-2-butanone at 333.2 K and 353.2 K

Abstract

The phenols recovery process is a significant part of treating coal chemical wastewater with highly concentrated phenols and ammonia. Solvent extraction is an important unit for phenol recovery section. The accurate measurement of liquid−liquid equilibrium (LLE) data is essential for realizing partitioning. In this paper, the LLE data for the ternary system water + 2-, 3-, 4-methylphenol +3,3-dimethyl-2-butanone (also known as methyl tert-butyl ketone, MTBK) were studied at the temperatures of 333.2 K and 353.2 K under 101.3 kPa. The extraction performance of MTBK was estimated by partition coefficients and separation factors. The extraction efficiencies of MTBK were compared with those of MIBK, mesityl oxide, and those results of MTBK at five different temperatures from 298.2 K to 353.2 K were also contrasted with each other. In addition, the nonrandom two-liquid (NRTL) and universal quasi chemical (UNIQUAC) models were applied to fit the measured LLE data. The results indicate that the calculated data based on the NRTL and UNIQUAC equations are good as reported by the experimental data, and the root-mean-square error (RMSE) values are lower than 2.50%. The obtained binary interaction parameters in this study can be used in the calculation of the LLE about the ternary system (water + 2-, 3-, 4-methylphenol + MTBK) as well as for the design and optimization of industrial process to remove methylphenols from effluents.

Experimental and Correlated Liquid–Liquid Equilibrium Data for Ternary Systems (Water + Poly(oxymethylene) Dimethyl Ethers + Toluene) at T = 293.15 and 303.15 K and p = 101.3 kPa

“…As shown in Figure , the distribution coefficient for the ternary LLE equilibrium systems are not constant, which is consistent with the reported research. ,, The distribution coefficient at 303.15 K is higher than at 293.15 K, indicating that the extraction capacity of the extractant increases with increasing temperature. ,, As can be seen in Figure , the separation factors decreased with the increase of the mass fraction of PODE n in aqueous phase and hence as a result of the mass fraction of water in organic phase was also increased . Meanwhile, the separation factor of four studied systems decreased with the increasing temperature and the influence of temperature on the separation factor was slight. ,− As the ratio of feed (water + PODE n ) to toluene increases, the separation capacity of the solvent decreases.…”

Experiments and COSMO-SAC Modeling of Methyl Isobutyl Ketone + Dimethylphenols + Water Mixtures

“…Solvent extraction is a common chemical technique for the removal and recovery of phenols, and this method achieves good results. − At the same time, liquid–liquid extraction has many advantages such as ease of running automatically, large throughput, low operating cost, and high extraction efficiency. − Although there are some alcohols or ester solvents used to extract phenols, they have some deficiencies, such as high solubility in water, strong volatility, low extracting efficiency, and so on. Methyl isobutyl ketone (MIBK) is a very promising extractant that can effectively avoid these shortcomings. − Thus, adopting MIBK as a solvent to extract dimethylphenols from aqueous solution would be a nice way.…”

Liquid–Liquid Equilibrium for 2-Methyl-2-butanol + Water + o-Xylene at Different Temperatures

“…Liquid–liquid equilibrium (LLE) data are indispensable for design and optimization of solvent extraction processes. − A lot of LLE data concerning the system 2-methyl-2-butanol + water + solvent have been investigated by researchers. Cháfer et al measured the LLE data of 2-methyl-2-butanol + water + glycerol at 283.2 and 323.2 K and at atmospheric pressure.…”