Effects of 4A Zeolite Additions on the Structure and Performance of LDPE Blend Microfiltration Membrane through Thermally Induced Phase Separation Method

Microfiltration membranes, 4A zeolite/LDPE, were prepared by blending low density polyethylene (LDPE) and4A zeolite through thermally induced phase separation (TIPS) process with diphenyl ether (DPE) as diluent. The effects of 4A zeolite loading on the pore structure and water permeation performance of the 4A zeolite/LDPE blend membranes were investigated. The incorporation of 4A zeolite particles greatly enhanced the connectivity of membrane pores, the pore size, and thus the water flux of 4A zeolite/LDPE blend membranes due to the gradually stronger DPE-zeolite affinity with the increase of the 4A zeolite loading. The water flux increased from 0 of LDPE control membrane to 87 L/m2h of 4A zeolite/LDPE blend membrane with 4A zeolite loading of 10 wt%. In addition, increasing the DPE content and cooling bath temperature is in favor of the water flux of 4A zeolite/LDPE blend membranes

Spectroscopic analysis of acetamide-AlCl3-based ionic liquid analog and their catalytic performance in isobutene oligomerization

The spectral structures of acetamide-AlCl3-based ionic liquid (IL) analogs were determined in detail through IR, NMR, and Raman spectroscopy. IR spectroscopy showed that 0.65AA-1.0AlCl3 was the coordination structure of Al and O atoms because of the resonance structure of acetamide. The mutual verification of the results of 27Al NMR and 1H NMR indicated that acetamide coexisted mainly in the form of cationic Al species and molecular Al species in xAA-1.0AlCl3, and AA/AlCl3 molar ratio affected the transformation of cationic Al species to molecular Al species. xAA-1.0AlCl3 was used as a green acidic catalyst for isobutene oligomerization, and the effects of AA/AlCl3 molar ratio, reaction temperature, reaction time, and volumetric ratio between IL analog and isobutene on product distribution were investigated. Optimal reaction conditions were AA/AlCl3 molar ratio of 0.75, reaction temperature of 60 °C, reaction time of 30 min, and catalyst/i-C4= volumetric ratio of 1.4 v/v. Under optimal conditions, isobutene conversion, (C8= + C12=) selectivity, (C16= + C20=) selectivity, and by-product selectivity were 85.26, 80.20, 6.80, and 13.00 wt%, respectively