Experimental liquid-liquid equilibria data of dilute hydroquinone concentration were determined for the ternary system methyl isobutyl ketone + water + hydroquinone at (25, 40, and 50) °C under atmospheric pressure. The experimental data were satisfactorily correlated with the UNIQUAC equation and the NRTL equation. The relative root-mean-square deviations and absolute mean deviations between the calculated and the experimental value are less than 1.2 %.
To
further reduce the total phenols of coal-gasification wastewater
which comes from the Lurgi pressurized coal-gasification process,
methyl isobutyl ketone (MIBK) instead of diisopropyl ether (DIPE)
is used as the extraction solvent in the process to remove the phenols.
To obtain process parameters for an industrial trial, process simulations
with a treatment capacity of 100 ton/h wastewater are carried out.
The simulation results show that with the use of MIBK as an extraction
solvent, the total phenol concentration of coal-gasification wastewater
can be reduced from 5410 ppm to less than 200 ppm. The operation cost
estimate shows that using MIBK as an extraction solvent to extract
and remove phenols from coal-gasification wastewater has good economic
feasibility. With the process parameters obtained from the simulation,
an industrial trial is implemented and satisfactory agreement is found.
With the total phenol concentration reduced to below 200 ppm in the
pretreatment, the coal-gasification wastewater can be decontaminated
in the subsequent biological treatment.
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