Concentration of aqueous hydrogen peroxide solution by pervaporation

Effects of hydrogen peroxide, temperature and treatment time on degradation properties of polyethersulfone ultrafiltration membrane

“…The three-level rotatable design matrix consisting of 17 runs was constructed by using the ranges of the independent variables (−1, 0, and +1) given in Table 1 . The values of independent variables were chosen to test of UP150 membrane performance in the harsh environment conditions [ 20 , 21 ]. In the BBD method, the number of experiments ( N ) is calculated using the following equation:…”

“…RSM designs are superior to single factor analysis methods (one-factor-at-a-time) in many aspects such as the ability to effectively evaluate the relationship between variables and the optimization of the system, requiring relatively few experiments, and deriving hypothetical mathematical equations of the response [ 17 , 18 ]. The Box-Behnken Design (BBD) is one of the widely used RSM designs and is considered to be more proficient and powerful than other designs such as the three-level full factorial design, central composite design (CCD), and Doehlert design [ 19 , 20 ]. Moreover, degradation of membrane structure was also investigated by evaluation of membrane flux recovery rate (FRR), contact angle, pore size, and porosity as responses in the BBD.…”

Polymeric Nanocomposite Membranes for Next Generation Pervaporation Process: Strategies, Challenges and Future Prospects

“…In fact, the highest H 2 O 2 selectivity of ~12 was observed for CMS-3 membrane at an H 2 O 2 concentration of 43 wt % with a total flux of 6.15 × 10 −3 gm cm −2 h −1 whereas for CMS-7, selectivity and total flux were found to be 9.2 and 9.6 × 10 −3 gm cm −2 h −1 , respectively, at the same H 2 O 2 concentration. However, both the membranes showed long-term stability at 35 wt % H 2 O 2 concentration [ 118 ]. Again, an aqueous pyridine solution was dehydrated using poly(AN- co -AA) membranes for separation of water-pyridine mixture [ 119 ].…”

Perfluoropolymer membrane behaves like a zeolite membrane in dehydration of aprotic solvents

“…It is therefore expected to be water selective over the aprotic organic solvents having low vapor pressures and large dimensions. This membrane has been used only recently in the separation of water from hydrogen peroxide solutions [12] and various alcohol-water systems [13]. In the latter study, the selectivities achieved were 319 and 500 at 22 1C for 1.3 wt% water solutions of ethanol and isopropanol respectively [13].The driving hypothesis there [13] is that solvent separation is based on a size exclusion mechanism rather than chemical affinity.…”