Feasibility study of polyetherimide membrane for enrichment of carbon dioxide from synthetic biohydrogen mixture and subsequent utilization scenario using microalgae

Abstract

In this work, the potential of utilizing a polyetherimide (PEI) hollow-fiber membrane to separate synthetic biohydrogen mixture (H 2 /CO 2 ) was studied.From the gas separation experiments, where the effects of feed to permeate pressure ratio (P feed /P permeate ) and stage-cut as key factors were evaluated, it was found that the PEI membrane had the capacity to purify either H 2 or CO 2 .It turned out that different separation settings should be chosen in accordance with the actual technological purpose, defined either as the enrichment of H 2 or CO 2 . The highest H 2 concentration (66.4 vol%) in the permeate was achieved at P feed /P permeate of 4.62 and stage-cut of 0.47, while the peak CO 2 concentration (79.2 vol%) in the retentate was obtained by applying P feed /P permeate of 4.55 and stage-cut of 0.65. The assessment and discussion of results indicated the possible utilization of the CO 2 -rich fraction (produced by the PEI membrane) for the biological sequestration using microalgae. To our knowledge, PEI membranes have not yet been tested in such a concept and thus, the results and experiences can mean a new contribution to the literature.

Assessing Detoxification Performance of Metal Hydroxide@Polymer Composites Prepared via Matrix-Incorporation and Spray-Coating Techniques

“…While Ultem is primarily considered a nonporous polymer, we investigated the possibility of employing the composites of this polymer for the detoxification of DMNP due to its high mechanical strength (see Figure S6). 60,61 As seen in Figure 5a, the Zr(OH) 4 @Ultem-Coat displayed superior catalytic performance than Zr(OH) 4 @ Ultem-Inc by displaying a τ 1/2 of ∼128 min and a k value of 0.005 min −1 , compared to 342.4 min and 0.002 min −1 values for Zr(OH) 4 @Ultem-Inc (see Table 4). Conversely, both Ce(OH) 4 @Ultem-Inc and Ce(OH) 4 @Ultem-Coat samples outperformed their Zr(OH) 4 @Ultem analogues despite their lower porosity and surface area (Figure 5b).…”

Membrane Unit for Integrated Gas Separation – Membrane Bioreactor (GS-MBR) System

“…PEI (ULTEM™ 1000 Resin grade) was purchased from SABIC. The chemical structure of a repeated unit of UL-TEM™ 1000 Resin and the details regarding its preparation have previously been presented [2].…”

“…located in the Czech Republic. The procedure was described in our previous paper [2]. The spinline used for fabrication of the membranes is shown in Fig.…”

“…P2-type HF membrane modules were constructed in a similar manner to those reported in [2], that is, from an arranged bundle of 250 A5-7 fibers (membrane area: 844 cm 2 ) inserted into a PVC pipe. A schematic diagram of the P2-type HF membrane module and a photograph of it are presented in Fig.…”