Vacuum film etching effect of carbon alumina mixed matrix membranes

Song, Yingjun; Wang, David; Birkett, Greg; Smart, Simon; Costa, João C. Diniz da

doi:10.1016/j.memsci.2017.06.082

Cited by 13 publications

(5 citation statements)

References 40 publications

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“…3), indicating porous membranes contrary to the dense xerogels. These results are in line with reports that impregnation using an assisted-vacuum method causes oligomers to get entrained with solvent and diffuse into porous substrates to form porous structures [18,19,24]. Therefore, molecular weight (MW) cut-off tests were carried out as the best approach to determine pore sizes.…”

Section: Resultssupporting

confidence: 87%

Novel inorganic membrane for the percrystallization of mineral, food and pharmaceutical compounds

Motuzas

Yacou

Madsen

et al. 2018

Journal of Membrane Science

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This work demonstrates for the first time the phenomenon of continuous percrystallization using a carbon membrane derived from the pyrolysis of food grade sugar. In addition, it is also the first demonstration of membranes separating solute from solvent and delivering dry crystals in a single step. This is contrary to membrane crystallization, which requires two further processing steps to filter crystals from a solution followed by drying the wet crystal particles. The results indicate that carbonised sugar membranes can confer ideal conditions of super-saturation, leading to instantaneous and continuous percrystallization of compounds at the permeate side of the membrane. As a result, very high percrystallization production rates of up to 55,000 kg m-2 per year are achieved. It is proposed that the percrystallization occurs in a wet thin-film modulated by solution permeation via the mesopores of the membrane, where vapour and crystals are separated at the membrane's solid-liquid-vapour interface. The potential deployment of this novel 2 technology is further demonstrated for a wide range of crystallization applications in chemical, hydrometallurgy, food and pharmaceutical industries.

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Section: Resultssupporting

confidence: 87%

Novel inorganic membrane for the percrystallization of mineral, food and pharmaceutical compounds

Motuzas

Yacou

Madsen

et al. 2018

Journal of Membrane Science

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“…Porous substrates are also extensively used for the preparation of inorganic membranes for microfiltration, [1][2][3] desalination, [4][5][6][7] gas separation, [8][9][10][11] and percrystallization processes. [12,13] These inorganic membranes are known as asymmetric membranes as they are conventionally prepared by coating ceramic [14][15][16] or carbon [17][18][19] thin films as top layers on porous substrates. The importance of the porous substrate is to provide the mechanical strength otherwise not available in thin films.…”

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confidence: 99%

Manufacture of Highly Porous Tubular Alumina Substrates with Anisotropic Pore Structure by Freeze‐Casting

et al. 2020

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Porous substrates play a major role in devices requiring the flow of fluids such as in filters and membranes. Porous substrates are also extensively used for the preparation of inorganic membranes for microfiltration, [1][2][3] desalination, [4][5][6][7] gas separation, [8][9][10][11] and percrystallization processes. [12,13] These inorganic membranes are known as asymmetric membranes as they are conventionally prepared by coating ceramic [14][15][16] or carbon [17][18][19] thin films as top layers on porous substrates. The importance of the porous substrate is to provide the mechanical strength otherwise not available in thin films. Many inorganic materials such as ceramics [20][21][22] and stainless steel [23][24][25] have been manufactured as porous substrates, though alumina is the most used material due to lower costs and processing versatility. Porous substrates come in several geometries such as tubes, [14,[26][27][28] hollow fibers, [29][30][31] and flat surfaces. [19,32] Traditionally, inorganic porous substrates are prepared from conventional ceramic processes such as slip-casting, [33,34] extrusion, [35,36] dry pressing, [37] tapecasting, [38][39][40] and phase inversion hollow fibers. [41,42] A relatively more recent method is the freeze-casting technique for processing porous ceramic substrates. [43][44][45][46] Due to the ability of forming an aligned pore structure, this technique can overcome problems associated with lower fluid fluxes conferred by conventional ceramic processing methods such as tortuous pore structure, constrictions, and dead-end and isolated pores. [47] Freeze-cast starts with the preparation of a stable ceramic suspension (or slurry) at normal conditions followed by controlled freezing of the solvent of the ceramic

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“…The feed NaCl 17.5 wt% concentration used in this work would generate an osmotic pressure over 135 bar, well beyond the RO plant operation capabilities. In addition, the high water fluxes in this work are also much higher than those obtained in pervaporative desalination using inorganic membranes operating at higher temperatures and lower NaCl feed concentration such as 22.9 L m -2 h -1 for cobalt oxide silica membranes (7.5 wt% at 60 ºC)[32], 25.4 L m -2 h -1 for carbon alumina membranes (3.5 wt% at 75 ºC)[33] and 9.2 L m -2 h -1 for hybrid carbon silica membranes (15 wt% at 60 ºC)[34]. This great performance of the carbonised sucrose membranes for pure water recovery proved to be a bonus for using this technology to crystallise solutes whilst recovering the solvent.As the best performance in terms of water and NaCl fluxes was delivered by the membrane carbonised at 750 ºC, this membrane was further tested to investigate the effect of the vacuum pressure in the permeate side.Fig.…”

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confidence: 77%

Fine control of NaCl crystal size and particle size in percrystallisation by tuning the morphology of carbonised sucrose membranes

Madsen

Motuzas

Vaughan

et al. 2018

Journal of Membrane Science

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This work investigates the morphological features of porous carbon membranes and operation effects for the percrystallisation of NaCl. The carbon membranes were prepared by dip coating of -alumina tubes in a sucrose solution, followed by a post vacuum-assisted impregnation and carbonisation in an inert gas atmosphere. The carbonisation temperature played an important role, as the highest pore volume and wet contact angle were achieved at the highest carbonisation temperature of 750 °C. In turn, this created hydrophobic carbon membranes delivering the highest water flux of 33 L m-2 h-1 (NaCl 17.5 wt%) and NaCl flux of 6.9 kg m-2 h-1. The solvent (water) and the solute (NaCl) crystals were separated in a single-step in a wet thin-film formed on the permeate face of the membrane under pervaporation conditions, delivering almost pure water (>99%) and dry NaCl crystals. The carbon membrane with the highest water flux delivered the smallest NaCl crystallite sizes, the smaller particle sizes, and the narrowest particle size distribution (< 2 µm). This was attributed to the fast water evaporation rate from the wet thin-film, as crystal growth rate was reduced and NaCl particle aggregation was restricted. A finer control of NaCl crystallite and 2 particle size was achieved by tailoring the morphological features of the carbon membranes and operating at the lowest vacuum pressure.

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Vacuum film etching effect of carbon alumina mixed matrix membranes

Cited by 13 publications

References 40 publications

Novel inorganic membrane for the percrystallization of mineral, food and pharmaceutical compounds

Novel inorganic membrane for the percrystallization of mineral, food and pharmaceutical compounds

Manufacture of Highly Porous Tubular Alumina Substrates with Anisotropic Pore Structure by Freeze‐Casting

Fine control of NaCl crystal size and particle size in percrystallisation by tuning the morphology of carbonised sucrose membranes

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