Fabrication of 6FDA-based composite membranes loaded with MIL-125 (Ti) for CO₂/CH₄ separation

Abstract

Carbon dioxide (CO2 ) separation is necessary for natural gas purification to enhance the calorific value of methane gas (CH4 ), besides reducing the corrosion risk in pipelines with the presence of water or moisture. This work focuses on the development of new combination of composite membrane materials containing titanium-based metal organic frameworks (MOFs) and 6FDA-based polymer for CO2 and CH4 gases permeation. The composite membranes were successfully fabricated by incorporating 0.5, 1.0, 3.0 and 5.0 wt% of MIL-125 (Ti) fillers into 6FDA-durene polymer by using solvent evaporation method. The resultant fillers and composite membranes were characterized by using different analytical tools including XRD, FESEM and EDX. Then, the permeability test was conducted by using single gas of CO2 and CH4. The results showed that composite membrane loaded with 5wt% of MIL-125(Ti) showed the highest CO2 permeability of 814.9 Barrer, and CO2/CH4 ideal selectivity of 18.1 compared to pure 6FDA-durene membrane with CO2 permeability of 510.3 Barrer and CO2/CH4 ideal selectivity of 8.6. It was found that the incorporation of fillers, MIL-125 (Ti) into 6FDA-durene polymer matrix led to the enhancement of gas permeation performance due to good compatibility between fillers and polymer matrix. Besides, the presence of organic ligand in MIL-125 (Ti) filler has potentially reduced the interfacial voids between the filler and polymer.

Ethylene Recovery via Pebax-Based Composite Membrane: Numerical Optimization

“…where A and B denote the temperature (°C), and pressure (bar), respectively. (6) where A and B denote the temperature ( • C), and pressure (bar), respectively.…”

“…As an alternative, membrane separation technology looks to be more promising owing to the simplicity of operation, environmentally friendly nature, compact footprint, and energy efficient qualities [5]. Unfortunately, membrane technology, especially polymeric membranes, suffer a trade-off between permeability and selectivity [6]. In contrast, inorganic membrane exhibits superior performance, but has challenges involved in the high cost and the complexity of fabrication.…”

Altering sorption and diffusion coefficients of gases in 6FDA‐based membrane via addition of functionalized Ti‐based fillers

“…Three samples from each membrane were measured twice to obtain an average value for the reproducibility of the experimental results and the error of the data obtained is within ±3%-5%. Then, the permeability of gases is calculated by using Equation ( 5) as follows [20] :…”

“…where P is the gas permeability (Barrer, 1 Barrer = cm 3 (STP) cm/s cm 2 cmHg), t is the thickness of the membrane (cm), V p is the flowrate (cm 3 (STP)/s), A m is the membrane area (cm 2 ), p h and p l are the pressure of feed and permeate, respectively (cmHg). The gas pair selectivity of the membrane is obtained from the following Equation ( 6) [20] :…”