Separation of supercritical fluid mixtrues of CO2 and petroleum components with an asymmetric polyimide membrane

Higashijima, Takeshi; Ohya, Haruhiko; Tsuchiya, Y.; Tokunaga, Hitoshi; Aihara, Masahiko; Negishi, Youichi

doi:10.1016/0376-7388(94)80005-7

Cited by 14 publications

(9 citation statements)

References 4 publications

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“…In the interest of clarity, this concept is depicted as a two-step process; however, it is important to note that the steps actually occur concurrently. 20 years (Afrane and Chimowitz, 1996;Chiu and Tan, 2001;Higashijima et al, 1994;Kulcke, 2001;Nakamura et al, 1993;Ohya et al, 1993;Sarrade et al, 2001;Semenova et al, 1992b). Much of the emphasis has been on ultrafiltration or nanofiltration membranes, which are either used in dense form or supported by a ceramic support.…”

Section: Introductionmentioning

confidence: 99%

“…Much of the emphasis has been on ultrafiltration or nanofiltration membranes, which are either used in dense form or supported by a ceramic support. However, an interesting series of papers published by Ohya et al (Higashijima et al, 1994;Semenova et al, 1992a,b) describes the successful separation of ethanol and iso-octane mixtures from supercritical carbon dioxide using asymmetric polymeric Kapton ® membranes. These findings are highly unusual because preferential separations of larger components from smaller components are typically not easily achieved in glassy materials.…”

Section: Introductionmentioning

confidence: 99%

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“Sorp‐vection”: An unusual membrane‐based separation

Damle

Koros

2005

AIChE Journal

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in Wiley InterScience (www.interscience.wiley.com). A nonstandard membrane process is described that involves highly selective sorption of a compound "A" at a large absolute weight fraction A , coupled with a significant diffusionally induced flux of a second component "B." The flux of B convectively moves A from a dilute external mass fraction relative to component B upstream to an enriched mass fraction downstream. The general form of the process has potential applications involving dilute feeds where current membranes processes perform poorly for such removal as a result of excessive solubility of the smaller component B. The most important IntroductionSeparations of condensables from effluent streams can be achieved by low-temperature condensation or pressure swing adsorption. These technologies have the disadvantage that they are energy intensive and tend to have large footprints. Membranes, on the other hand, are compact, simple to operate, and economical. Development of membranes for separation of condensable components from effluent streams is being pursued and provides a potentially attractive separation avenue (Baker et al., 2002(Baker et al., , 1994(Baker et al., , 1998. If properly supported against mechanical deformation, polymer membranes can be used to separate dilute concentrations of highly condensable bulky components from smaller, less condensable components such as air. The highly condensable nature of heavier and polar hydrocarbons tends to make them sorb easily into rubbery or glassy polymers, whereas highly supercritical components such as N 2 exhibit low sorption uptakes, even at relatively high pressures of 10 bars or so (Mark et al., 1984). On the other hand, for rubbery polymers, the intrinsically higher diffusion coefficient for smaller vs. larger molecules tends to be much less extreme than that in glassy materials. Therefore, rubbery polymers are the preferred materials for such solubility-based separations where the sorption level of the small molecule is sufficiently low. An increasingly important class of systems, however, constitutes a sufficiently high intrinsic sorption coefficient that may prevent effective application of this simple solubility-controlled sorption-diffusion permeation mechanism of separation. This type of application is the focus of this article.Separations involving supercritical carbon dioxide are of great interest, and development of CO 2 technology for use in industrial processing has become a research focal point. Worldwide, billions of pounds of organic solvents are used as processing tools, cleaning agents, and dispersants. Concern for workers' safety and a drive to protect the environment have prompted industrial and academic research efforts to develop acceptable solvent alternatives (DeSimone 1998 and has a broad range of dissolving power, especially in the supercritical region (Kazarian et al., 1999;McHugh and Krukonis, 1986). For the CO 2 to be recycled and reused in processing applications, separation of the CO 2 from bulkier organic solutes wil...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“Sorp‐vection”: An unusual membrane‐based separation

Damle

Koros

2005

AIChE Journal

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“…[5][6][7][8][9][10] On the other hand, permeation through materials under high-pressure environments is an active topic that is of increasing importance. [11][12][13][14][15][16][17][18][19][20] Both inorganic and organic materials have been considered for these applications. Several researchers have begun to investigate both inorganic and organic materials for these applications.…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17] The materials used in these separations were either inorganic/ organic composites or purely inorganic. Higashijima et al 13 studied hydrocarbon/supercritical CO 2 separations utilizing asymmetric Kapton polyimide materials. Both Higashijima and Sarrade briefly describe a high-pressure system that was used to obtain experimental data.…”

Section: Introductionmentioning

confidence: 99%

Permeation Equipment for High-Pressure Gas Separation Membranes

Damle

Koros

2003

Ind. Eng. Chem. Res.

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This paper describes the development of a constant volume, variable pressure permeation system for use in testing membrane materials up to pressures of 276 bar with both a vacuum and pressurized downstream. In addition, a membrane masking technique that is well-suited for use with this system in high-pressure applications is also described. To illustrate the utility of the equipment, permeation and selectivity results for a commercially available polyimide, Matrimid, under pure and mixed gas conditions are presented and discussed in relation to studies reported at lower feed pressures with more conventional systems.

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“…Scaling up is easy and energy consumption is generally low. Numerous studies have reported the use of membranes in the processes of separation of SCCO 2 and a solute: ethanol (Semenova et al, 1992), light fractions of petroleum (Higashijima et al, 1995), fractionation of triglycerides in supercritical medium (Sarrade et al, 1999), and nutmeg essential oil (Spricigo et al, 2001), all achieving different degrees of separation in which a linear relationship was found between the permeate flux and the applied pressure differential. Sartorelli and Brunner (2000) observed a characteristic common to many of the processes involving membranes that appears in some separations of SCCO 2 and certain types of extract: high selectivity of the membranes is characterised by low permeate flux or high permeate flux combined with low selectivity.…”

Section: Introductionmentioning

confidence: 99%

Use of reverse osmosis membranes for the separation of lemongrass essential oil and supercritical CO2

Sarmento¹,

Machado

Bolzan

et al. 2004

Braz. J. Chem. Eng.

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-Although it is still used very little by industry, the process of essential oil extraction from vegetable matrices with supercritical CO 2 is regarded as a potentially viable technique. The operation of separating the extract from the solvent is carried out by reducing the pressure in the system. Separation by membranes is an alternative that offers lower energy consumption and easier operation than traditional methods of separation. Combining the processes essential oil extraction with supercritical CO 2 and separation by membranes permits the separation of solvent and oil without the need for large variations in extraction conditions. This results in a large energy savings in the case of solvent repressurisation and reuse. In this study, the effectiveness of reverse osmosis membranes in separating lemongrass essential oil from mixtures with supercritical CO 2 was tested. The effects of feed oil concentration and transmembrane pressure on CO 2 permeate flux and oil retention were studied for three membrane models.

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Separation of supercritical fluid mixtrues of CO2 and petroleum components with an asymmetric polyimide membrane

Cited by 14 publications

References 4 publications

“Sorp‐vection”: An unusual membrane‐based separation

“Sorp‐vection”: An unusual membrane‐based separation

Permeation Equipment for High-Pressure Gas Separation Membranes

Use of reverse osmosis membranes for the separation of lemongrass essential oil and supercritical CO2

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