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621 results on '"Marrucho, Isabel M."'

23. Greening the physical recycling of HDPE: dissolution precipitation with natural solvents.

Author

Aparício, Sofia C., Castro, Pedro M., Ribeiro, Bernardo D., and Marrucho, Isabel M.

Subjects
PINENE, SOLVENTS, HIGH density polyethylene, PLASTIC recycling, POLYETHYLENE terephthalate, ENERGY consumption, PLASTIC scrap recycling
Abstract

Polyolefins comprise some of the most abundant plastics, but their recycling faces several difficulties. This work focuses on the recycling of high-density polyethylene (HDPE) through the dissolution–precipitation method. Although few works have been published on this topic, this is an extremely promising plastic recycling strategy. However, for this kind of process to become a viable alternative, the replacement of conventional solvents by green solvents and the minimization of energy usage need to be implemented. In this work, several natural terpenes were screened based on COSMO-SAC predictions for HDPE solubility, and three were tested: limonene, α-pinene, and p-cymene. These solvents showed a good capability of dissolving HDPE, confirming the computational predictions. The dissolution and precipitation conditions were optimized based on the results for limonene, with the optimal values being 3 wt% initial concentration of the polymer in the solvent, a dissolution period of 10 min at a temperature of 110 °C, and an antisolvent/solvent ratio of 2/1. Comparing both HDPE and solvent recoveries for the three selected solvents, the best results were obtained for α-pinene as the solvent and ethanol as the antisolvent. The recovered HDPE samples were analyzed by TGA, FTIR, and DSC, showing little modification between the recycled and pristine materials. Scaling up of the process and solvent reuse were also investigated. Through process simulation, it was concluded that solvent recovery and reuse is a crucial step for economic viability. HDPE dissolution–precipitation with α-pinene was found to be a sustainable process from preliminary sustainability analysis, and the separation of HDPE and PET (polyethylene terephthalate) was successfully carried out. [ABSTRACT FROM AUTHOR]

Published
2024
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38. Application of Aqueous Biphasic Systems Extraction in Various Biomolecules Separation and Purification: Advancements Brought by Quaternary Systems.

Author

Marchel, Mateusz and Marrucho, Isabel M.

Subjects
*BIOMOLECULES, *EUTECTICS, *BIOLOGICAL products, *SEPARATION (Technology), *IONIC liquids, *RESEARCH personnel
Abstract

Aqueous biphasic systems (ABS) extraction is a simple, selective, efficient and easy to scale-up technology that, over the years, has attracted a considerable attention from the researcher community as an alternative methodology in downstream processing of a wide variety of biomolecules. This review summarizes and discusses the fundamental features of ABS, as well as its advantages and disadvantages, as a separation and purification technology of biomolecules. Nevertheless, the focus of this review are quaternary ABS formed by the addition of neutral salts and ionic liquids to conventional ABS or those ABS composed by deep eutectic solvents and another phase forming compound. The advantages brought by quaternary ABS in terms of separation and purification of biomolecules, as well as the main issues governing the phase behavior of these systems, are discussed. With examples of application of quaternary ABS as an alternative extraction and purification methodology, it is shown that such ABS are a promising method to improve the effectiveness of biomolecules downstream processing, potentially providing a response to the increasing demand for high purity bioproduct. Furthermore, some of the discussed quaternary ABS have a great potential as a novel, sustainable and cost-effective purification platform for biomolecules downstream processing that can potentially simplify the whole ABS-based purification process due to no need for target bioproduct recovery or phase formers removal. Finally, perspectives of such quaternary ABS are made, and some future challenges pointed out. [ABSTRACT FROM AUTHOR]

Published
2023
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