Pervaporation Removal of Pyridine from Saline Pyridine/Water Effluents Using PEBA-2533 Membranes: Experiment and Simulation

Abstract

Pervaporation technology using PEBA-2533 membranes was investigated to separate a low concentration of pyridine from the ternary mixture of pyridine, water, and NaCl. The experimental results showed that the studied membrane could achieve the enrichment of pyridine and the rejection of NaCl simultaneously. The permeation of pyridine was driven by the temperature and pyridine concentration in the feed solution. The experimental results for the effect of NaCl content on the fluxes correlated with the simulation values of water and pyridine activities. The pyridine activity values increased and water activity decreased on adding NaCl to the feed solution. What is more, it was confirmed that the accumulation of NaCl in the membrane increased with the NaCl concentration, which could influence the flux. According to the results of molecular dynamics (MD) simulations, the introduction of NaCl reduced the number of hydrogen bonds between pyridine and water, which was beneficial to the separation. The long-term operation tests for the pervaporation process showed that the poly(ether-block-amide) (PEBA) membrane had excellent stability, which proved the feasibility of pervaporation as an industrial process.

Application of a biodegradable poly(butylene adipate-co-terephthalate) membrane for phenol pervaporation recovery

“…In the NVT -MD simulation, a hydrogen bond script was used for each swelling model to automatically obtain the number of hydrogen bonds formed between phenol and water within the range of hydrogen bond action. 45 As such, the relationship between the swelling degree and the hydrogen bonds is plotted in Fig. 3.…”

“…Since the sample contained only water and phenol, after determining the water content, the phenol content in the sample could also be determined. 45…”

“…The pervaporation experimental equipment was homemade in the laboratory. 45 Around 800 mL of the phenol solution was added into the feed tank and contacted with one side of the membrane through a circulation pump. The effective area of the membrane used in the cell was 16.6 cm 2 .…”

“…This was because the permeate driving force rose. 45,52 However, the separation factor showed a decreasing tendency, which should be because with the phenol concentration increased, clusters occurred between phenol molecules by hydrogen bonding, reducing the diffusivity and permeability of the molecules. 20 4.3.2.…”

MOFTextile: Metal‐organic frameworks nanosheets incorporated cotton textile for selective vapochromic sensing and capture of pyridine

“…However, the current detection methods require sophistically instruments and tedious procedures. [3,4] Py can be removed via adsorption [2,[5][6][7][8][9][10] and degradation (via ozonation, [11] electrochemical, [12] atmospheric DC water plasma, [13] or biological biodegradation, [14,15] electrical bio-photodegradation, [16] or microbial fuel cells [17] ) methods. Some of those adsorbents require toxic reagents such as heavy metals.…”