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Phenol Extraction from Coal Gasification with PVDF Hollow Fiber Membrane Module

Author: DuanZuoShan
Tutor: YaoJie
School: Harbin Institute of Technology
Course: Environmental Science and Engineering
Keywords: Hollow fiber membrane extraction Phenol Cyanex 923 Extraction rate Separation factor Mass transfer coefficient
CLC: X703.1
Type: Master's thesis
Year: 2010
Downloads: 96
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Abstract


The hollow fiber membrane extraction is a new separation technology, especially for metal ion membrane process combined with liquid-liquid extraction, separation and extraction of the heat-sensitive material and difficult to separate substances. Compared with the traditional liquid-liquid extraction process, membrane extraction mass transfer area, high extraction efficiency, low energy consumption, little environmental pollution and flooding and backmixing extractant loss advantage. Currently, the technology is in the initial stage of industrial application, is a hot research field of environmental protection. Therefore, there are many issues worthy of study. In this thesis, the hydrophobic PVDF hollow fiber membranes for mass transfer interface, efficient extractant Cyanex 923 - kerosene-NaOH solution system simulation phenol wastewater Extraction - anti-extraction experiments to study the two-phase mass transfer mode, an aqueous phase and an organic phase The initial flow rate, influent concentration, membrane module loading factor, ionic strength, membrane modules in series and operating conditions of the back-extraction phase concentration on the extraction rate and mass transfer performance. And on this basis, the actual gasification wastewater extraction experiments. The experimental results fit the curve of the extraction equilibrium, and calculate the partition coefficient and phenol concentration in the aqueous phase: logD = 1.62-0.077caq. The pH value of the partition coefficient, pH gt; 8, the partition coefficient decreased rapidly. Increased water flow rate can significantly speed up the extraction process and improve the mass transfer coefficient, and change the flow rate does not influence the mass transfer coefficient of the organic phase. This shows that the aqueous phase boundary layer resistance is total control of the mass transfer resistance factors, calculated results also show that the relative resistance of the organic phase boundary layer resistance and film accounted for less than 20%. Within the scope of the water phase flow rate of 0.002m / s ~ 0.016m / s, the mass transfer unit height of the membrane module is 0.17m ~ 0.75m, significantly less than traditional extraction equipment. Increasing influent initial phenol concentration, but lower overall mass transfer coefficient of mass transfer across the interface, the one hand, the distribution coefficient with the initial concentration decreases, on the other hand, the concentration exacerbated concentration phenomenon. The membrane module of the uniform distribution and the density level of the filling factor and the film has a great influence on the mass transfer. The mass transfer area increases the filling factor can be improved, but also prevents the membrane fiber spacing becomes smaller, extrusion phenomenon easily occurs, so that the mass transfer coefficient is reduced. Series of low filling factor of the membrane module can shorten the extraction time saving investment. The salting effect can promote the extraction of the mass transfer process. Can be enhanced by increasing the ionic strength of the aqueous phase to the mass transfer. When the NaOH concentration increased by 0.1mol / L 0.5mol / L, back extraction coefficient increases by 4.83 × 10-7m / s to 5.93 × 10-7m / s. Phenol recovery rate of 93% or more. The mass transfer coefficient of the back-extracted one order smaller than the extraction of the mass transfer coefficient, which is due to the back extracted mass transfer interface does not exist pre-adsorption advantage of solute. The content of the actual wastewater SS have a significant effect on the extraction rate, mass transfer accelerated after coagulation pretreatment. In a continuous countercurrent extraction experiment, the water phase flow rate within a certain range to increase the extraction rate can be increased, but more than this range, the extraction rate began to decrease. The membrane modules in series extend the contact time of the two phases, and the extraction rate increases. SEM test, prolonged use of membrane and membrane fouling found no strong contamination resistance of the membrane extraction.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization > Technology and methods
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