Separation of phenanthrene/N‐tetradecane mixtures (model diesel) via pervaporation using an aromatic polyimide membrane

Abstract

The present investigation focuses on the separation of phenanthrene (a polyaromatic hydrocarbon) from n-tetradecane (model diesel composition) via pervaporation using a fabricated aromatic polyimide membrane. The experiments demonstrate preferential permeation of the polyaromatic for all films within the studied experimental range. The influence of operating temperature, membrane pretreatment time, membrane composition, and membrane thickness on the pervaporative performance were investigated. Statistical software Design Expert 7.1.4 was used to derive the regression equation describing the effect of the above mentioned factors on the pervaporation separation index. These factors are optimized using response surface methodology. The highest value of pervaporation separation index obtained is 1.5277 kg m 22 h 21 and the corresponding optimized condition is: operating temperature 493 K, pretreatment time 16.55 h with a membrane composition of 2.76 wt% of phenanthrene in polyamic acid and thickness 53.22 mm.

Preparation of a SiOx coating with a lot of micro–nanometre wrinkles on the polyimide surface and its resistance to corrosion

“…After the hydrothermal treatment with the low concentration of NaOH, the samples to be further treated by the APTES/PhMe solvothermal process, the tensile strength and elongation at break were all decreased again. It may be related to the toluene swelling of Kapton matrix [35]. However, after an acid silica sol formed a coating on the Kapton surface, the tensile strength and elongation at break changed from decreasing to increasing.…”

Separation of polyaromatic hydrocarbons from model diesel composition via pervaporation using a fabricated aromatic polyimide membrane and process optimization

“…In our previous work , total permeation flux and enrichment factor of the PAH were measured. The focus of this work is separation of the PAHs as a whole from the model diesel composition.…”

“…PAHs are the major components of diesel automobile emission particles due to incomplete combustion; most of these are known human carcinogens . According to Worldwide Fuel Charter, organized jointly by automakers and engine manufacturers, the maximum allowable concentration of PAHs in automotive diesel should be <2% volume (max) . Hence, removal of PAHs from diesel is absolutely necessary.…”

“…From our previous studies , permeability of components, present in prepared model diesel (phenanthrene in n ‐tetradecane) through fabricated API membrane reveals successful separation of desired PAH via pervaporation (PV). In addition, the sorption and subsequent permeation explain the interaction of fabricated membrane component (containing phenanthrene) with feed mixture quite predominant at an elevated temperature, higher feed concentration, and lower downstream pressure.…”

Desulfurization performance of polydimethylsiloxane membranes by pervaporation: Effect of crosslinking agents

“…Pervaporation (PV), as a new separation technology, has been widely used in gasoline desulfurization due to its low capital investment, less energy consumption and environmentally friendly . In recent years, several types of membrane materials have been developed and investigated for the deep desulfurization of FCC gasoline via pervaporation, include polydimethylsiloxane (PDMS) , polyethylene glycol (PEG) , polyimides (PI) , hydroxy ethyl cellulose (HEC) , etc. Among these membranes, PDMS, as one of the typical membrane, has been widely used for pervaporation desulfurization.…”