Recent advances in smart integrated membrane assisted liquid extraction technology

Novel processes based on SIMALE have been proposed as effective methods for the selective separation of different chemical species such as metal ions, organic/biologically important compounds and gas mixtures from different waste streams including nuclear waste. The industrial use of supported liquid membranes based on conventional liquids is limited by their relative instability and short lifetime. Under SIMALE techniques, the stability of the SLM is ensured by a modified SLM with pseudo emulsion based hollow fiber strip dispersion or non-dispersive solvent extraction techniques. In order to promote operational stability, SIMALE, using ionic liquids, as a liquid membrane phase could overcome these inconveniences due to their negligible vapour pressure and the possibility of minimizing their solubility in the surrounding phases. SIMALE studies on membrane-based dense gas extraction reported higher extraction efficiencies when the near critical or supercritical solvent is used. This review also discuss important applications including scale up, process intensification aspects, current status of the technology and future directions.Peer ReviewedPostprint (author's final draft

Journal of Membrane Science & Research

Membrane assisted liquid extraction (MALE) technologies are gaining an important role as an extraction /separation technique for actinides and are being deployed as a promising tool for remediation of nuclear waste generated in the reprocessing plant and other radioactive wastes containing a trace level of radionuclides. The present contribution outlines the classification of membrane assisted liquid extraction techniques, its operating principle, associated transport mechanism and merits and demerits with respect to industrial applications. Finally, selected applications of MALE techniques (BLM, SLM and ELM) are presented for extraction/separation of actinides and other radiotoxic nuclides from .different streams of low level and high level radioactive wPostprint (author's final draft

Solvent extraction: principles and practices,

Recent advances in analytical chemistry are characterized by great progress toward more powerful methods of separation, equaling in significance the great forward strides made in instrument methods of determination. Problems of chemical analysis almost always involve two steps; separation of the desired constituent and measurement of the amount or concentration of this constituent. Much worthy research has been dedicated to the development of more discrimination methods of estimation, such as spectrographic, spectrophotometric, and polarographicmethods, whichminimize the need for separation steps preceding themeasurement step. However, with the rapid growth of chemical technology, the analytical chemist is called upon to deal with mixtures of increasing complexity. Therefore to meet this challenge, powerful separation technique like solvent extraction or solvent extraction based methods are needed which enjoys a favored position among the separation techniques because of its ease, simplicity, speed, and wide scope.Peer ReviewedPostprint (author's final draft

Solvent extraction: principles and practices,

Recent advances in analytical chemistry are characterized by great progress toward more powerful methods of separation, equaling in significance the great forward strides made in instrument methods of determination. Problems of chemical analysis almost always involve two steps; separation of the desired constituent and measurement of the amount or concentration of this constituent. Much worthy research has been dedicated to the development of more discrimination methods of estimation, such as spectrographic, spectrophotometric, and polarographicmethods, whichminimize the need for separation steps preceding themeasurement step. However, with the rapid growth of chemical technology, the analytical chemist is called upon to deal with mixtures of increasing complexity. Therefore to meet this challenge, powerful separation technique like solvent extraction or solvent extraction based methods are needed which enjoys a favored position among the separation techniques because of its ease, simplicity, speed, and wide scope.Peer Reviewe

Hollow fiber membrane-based analytical techniques recent advances

Problems of chemical analysis almost always involve two steps; separation of the desired constituent and measurement of the amount or concentration of this constituent. Under the scope of these two steps, sample preparation, proposed analytical technique, and instrumention coupled with analytical system are of paramount importance. Among various analytical techniques, membrane extraction has gained great attention due to its several merits as compared to conventional methods. In all types of membrane extraction, the membrane separates the sample phase (often called donor or feed solution) from the acceptor or strip phase, and the analyte molecules pass through the membrane from the donor to the acceptor. The membrane extraction techniques can be divided into porous and nonporous membrane techniques. Another distinction is between one-, two-, and three-phase membrane extraction techniques.Peer ReviewedPostprint (published version

Recent advances in smart integrated membrane assisted liquid extraction technology

Novel processes based on SIMALE have been proposed as effective methods for the selective separation of different chemical species such as metal ions, organic/biologically important compounds and gas mixtures from different waste streams including nuclear waste. The industrial use of supported liquid membranes based on conventional liquids is limited by their relative instability and short lifetime. Under SIMALE techniques, the stability of the SLM is ensured by a modified SLM with pseudo emulsion based hollow fiber strip dispersion or non-dispersive solvent extraction techniques. In order to promote operational stability, SIMALE, using ionic liquids, as a liquid membrane phase could overcome these inconveniences due to their negligible vapour pressure and the possibility of minimizing their solubility in the surrounding phases. SIMALE studies on membrane-based dense gas extraction reported higher extraction efficiencies when the near critical or supercritical solvent is used. This review also discuss important applications including scale up, process intensification aspects, current status of the technology and future directions.Peer Reviewe

Journal of Membrane Science & Research

Membrane assisted liquid extraction (MALE) technologies are gaining an important role as an extraction /separation technique for actinides and are being deployed as a promising tool for remediation of nuclear waste generated in the reprocessing plant and other radioactive wastes containing a trace level of radionuclides. The present contribution outlines the classification of membrane assisted liquid extraction techniques, its operating principle, associated transport mechanism and merits and demerits with respect to industrial applications. Finally, selected applications of MALE techniques (BLM, SLM and ELM) are presented for extraction/separation of actinides and other radiotoxic nuclides from .different streams of low level and high level radioactive

Hollow fiber membrane contactors. Introduction and perspectives

Over the last two decades, hollow fiber contactor-based technology has grown into an accepted unit operation for a wide variety of separations. The increase in the use of this technology, owing to strict environmental regulations and legislation, together with a growing preference for it over conventional separation processes, has led to a spectacular advance in membrane development, module configurations, and various applications. Future perspectives on the success of HFMC technology research and its impact on membrane separations are key directions for the researchers and experts working in this field. As considerable progress has been made in a number of key areas, with some important and unanticipated developments, this type of technology assessment can play an important role in setting the directions for future research and development, both for individual scientists and engineers and for the broader membrane community.Peer ReviewedPostprint (published version

Membrane based techniques in analytical applications

This article presents an overview of the various membrane-based systems and their role in analytical applications. This includes a systematic review of the various membrane extraction methods used to determine variuos compounds in different matrices in chemical and environmental application

Membrane based techniques in analytical applications

This article presents an overview of the various membrane-based systems and their role in analytical applications. This includes a systematic review of the various membrane extraction methods used to determine variuos compounds in different matrices in chemical and environmental applicationsPostprint (published version