Evaluation of polymeric hydrophobic membranes for the purification of chlorine produced in electrochlorination processes using seawater desalination brines
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hdl:2099.1/17625
Tipus de documentProjecte Final de Màster Oficial
Data2012-09
Condicions d'accésAccés obert
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Abstract
The purification of chlorine from brines using polymeric hydrophobic membranes has been
evaluated in this work. The objectives have been both to determine the suitable membrane
to efficiently transport chlorine and the best operational conditions. Fluoride based polymeric
membranes like Polytetrafluoroethylene (FGLP) and (Polyvinylidene fluoride (GVHP) have
been selected. Mass transport properties of these membranes have been determined
experimentally using flat-sheet membrane modules. The transported chlorine is stabilized in
the receiving phase using concentrated solutions of NaOH. The experimental studies have
been carried out with under different initial total chlorine concentration and pH. It was
determined that most efficient membrane for purification of chlorine is GVHP as provided
higher permeability (3.11x10-3m.s-1) values in all operating conditions; the mass transfer
coefficient for the membrane varied from 7.59x10-7 to 5.31x10-5cm.s-1 while for the FGLP
membrane varied from 1.27x10-6 to 1.90x10-5cm.s-1. The membranes showed to be resistant
to the oxidizing conditions of these solutions as demonstrated by FT-IR and SEM-EDS.
Chlorine speciation is affecting the strongly the mass transport properties and for example
HOCl species are transported in major proportion when the pH of the feed solutions is higher
than 2 than the Cl2 species. The experimental results demonstrated the strong influence of
the membrane permeability to chlorine species on the pH of the feed solution.
MatèriesSaline water conversion, Water -- Purification -- Chlorination, Membranes (Technology), Polymers, Aigua salada -- Dessalatge, Aigua –- Depuració -- Cloració, Membranes (Tecnologia), Polimers
TitulacióMÀSTER UNIVERSITARI EN RECERCA EN ENGINYERIA DE PROCESSOS QUÍMICS (Pla 2009)
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TFM_Freddy Tinoco.pdf | Report | 1,790Mb | Visualitza/Obre |