Detail of "16712-20-2"

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Removal of 1,1,1-trichloroethane from water using a polyvinylidene fluoride hollow fiber membrane module: Vacuum membrane distillation operation

All Rights Reserved. Removal of 1,1,1-trichloroethane from water using a polyvinylidene fluoride hollow fiber membrane module: Vacuum membrane distillation operation. Wu, Bing; Tan, Xiaoyao; Li, K.; Teo, W. K. (Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 119260, Singapore). Separation and Purification Technology, 52(2), 301-309 (English) 2006 Elsevier B.V. CODEN: SPUTFP. ISSN: 1383-5866. DOCUMENT TYPE: Journal CA Section: 61 (Water) Polyvinylidene fluoride (PVDF) hollow fiber membranes with an asym. structure were prepd. by the phase inversion method using dimethylacetamide (DMAc) as solvent and LiCl-H2O as additives and applied for volatile org. compds. (VOCs) removal from water. The membrane was characterized using SEM for observing its microstructures and a gas permeation method for measuring its porosity, pore size and pore size distribution. The results have provided the conditions for tailor-made hollow fiber membranes with the desired morphol. suitable for vacuum membrane distn. (VMD). The structural parameters such as mean pore size and effective porosity detd. are being used as parameters in the math. modeling of the VMD process. A hollow fiber membrane module was then fabricated using a selected PVDF hollow fiber membranes and applied for removal of 1,1,1-trichloroethane (TCA) from water. 71-55-6 and 16712-20-2 are cas registry numbers of chemicals which are used as reagents here. The effects of various operating parameters including downstream vacuum level, feed temp., feed flow rate and TCA feed concn. on the performance of the module were investigated both theor. and exptl. A high feed temp. and/or a low downstream pressure favored the enhancement of TCA removal, but also yielded dramatically a high water permeation flux, resulting in an excessive diln. of the permeated VOC. Under optimal operating conditions, particularly the downstream vacuum level, feed temp. and feed flow rate, TCA removal efficiency ￡97% was achievable. A math. model, which takes into consideration of mass transfer resistances in both liq. and membrane phases, predicts well the TCA removal data in comparison with the exptl. obsd. results under the favorable operation ranges employed in vacuum membrane distn. .