Abstract
Investigating the influence of operating parameters is a critical step in development of diffusion dialysis for acid recovery. A series of novel anion exchange membranes consisted of methyl 6-(dimethylamino) hexanoate (MDMH) and poly (2, 5-dimethylphenyl oxide) are successfully fabricated and used for acid recovery via DD process. Initially, the 6-(dimethylamino) hexanoic acid and MDMH are synthesized via condensation reaction and its chemical structure is confirmed by 1H NMR spectroscopy. After membranes fabrication, the chemical composition and morphological structures are confirmed by Fourier transform infrared spectroscopy and scanning electron microscopy. The MDMH-QPPO AEMs possess good acid permeability, selectivity, and outstanding thermo-mechanical stability. A synthesized membrane (MDMH-QPPO-5) with better performance of acid permeability and selectivity is selected for mathematical and statistical studies of process parameters in diffusion dialysis. The effect of process parameters including temperature, time and feed concentration are studied through full factorial design (FFD). The half normal plot is used to investigate the order of process parameters that considerably affecting the acid dialysis coefficient and separation factor. The results showed that the investigation of significant process parameters is useful to improve the acid recovery via diffusion dialysis.
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