Preparation and characterization of methanol selective membranes based on polyheteroarylene − Cu(I) complexes for purification of methyl tertiary butyl ether

Abstract

A comparative study of metal − polymer complexes of Cu(I) with polybenzoxazinoneimide (PBOI) and its prepolymer imide-containing polyamic acid (PAA) as novel membrane materials for methyl tertiary butyl ether (MTBE) purification was undertaken. The structure, physical parameters and transport properties were characterized in detail to analyse the separation performance of the membranes and obtain new knowledge on the interdependence of the chemical structure and physical data with transport parameters. Thermally initiated conversion of PAA − Cu(I) to PBOI − Cu(I) was studied by TGA and DSC. The thermal conversion increases the polymer glass transition temperature and membrane density. Both polymers were applied to pervaporation separation of MTBE from methanol impurities. Membranes based on PAA are highly effective in MTBE purification and preferably permeate methanol. The transport properties of PAA − Cu(I) membrane are compared with those of known membranes.

Polyimide Asymmetric Membrane vs. Dense Film for Purification of MTBE Oxygenate by Pervaporation

“…Table 4 lists data on the operating temperature, composition of the feed and permeate, as well as the values of total flux and separation factor that were obtained for different polymer membranes in a number of published works. It can be stated that dense symmetric PI-PM membrane possesses high selective properties which are comparable or superior than various dense membranes [8,10,12]. At the same time, the flux through the asymmetric PI-PM membrane is higher as compared to other membranes, except for some modified membranes [21,25,26].…”

“…Thus, the PI-PM membrane has a considerable methanol capacity when separating the methanol/MTBE solutions. In our previous works [12,20], water contact angles were measured for various polyimide membranes: P84 (72.0 • ) and thermally rearranged polyimide (73.1 • ). It is indicating the similar wettability of polyimide membranes, which confirmed the data validity for PI-PM membrane.…”

“…Table 2 lists some physical properties of methanol and MTBE, such as molecular weight, density, molecular volume, boiling point, dipole moment, and solubility parameters. It should be underlined that methanol and MTBE form an azeotropic mixture composed of 14.3 wt% methanol and 85.7 wt% MTBE which cannot be separated by distillation [12,21]. The mass transfer in pervaporation occurs according to the solution-diffusion mechanism.…”

“…In our previous work [12], two dense flat membranes composed of polymer-metal complexes based on 2,2/-biquinoline-8,8/-dicarboxylic acid with Cu(I) and its thermally rearranged polybenzoxazinoneimide-8,8/-Cu(I) have been developed and studied in pervaporation of a methanol/MTBE mixture. These membranes were enough selective with respect to methanol, but they had moderate total flux (15 g•m −2 •h −1 ) in separation of azeotropic mixture.…”

Influence of Macromolecular Brushes with Polyimide Backbones and Poly(methyl methacrylate) Side Chains on Structure, Physical, and Transport Properties of Polyphthalamide

“…The resulting solid‐phase polymer compositions are usually heterogeneous . The development of microheterogeneous compositions with adjustable phase structures is an efficient method of obtaining new materials with improved properties , including effective polymer membranes . Currently, is known a lot of polymer hybrid membranes based on commercially available polymers .…”