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Processes
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Green Chemistry: From Wastes to Value-Added Products (2nd Edition)
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Green Chemistry: From Wastes to Value-Added Products (2nd Edition)

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Environmental and Green Processes".

Deadline for manuscript submissions: 15 December 2024 | Viewed by 3014

Special Issue Editors

Dr. Roberto Palos

E-Mail Website
Guest Editor
Department of Chemical Engineering, University of the Basque Country UPV/EHU, PO Box 644, 48080 Bilbao, Spain
Interests: heterogeneous catalysis; development of environmentally friendly processes; sustainable production of fuels
Special Issues, Collections and Topics in MDPI journals
Dr. Alazne Gutiérrez

E-Mail Website
Guest Editor
Department of Chemical Engineering, University of the Basque Country UPV/EHU, PO Box 644, 48080 Bilbao, Spain
Interests: environmental awareness and sustainability; waste treatment; intensification of processes; valorization of secondary streams and recycling processes
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The predominant linear mentality that is maintained in modern society has only advanced the serious environmental crises, such as the rampant deposition of waste in our environment, the regulated accumulation in landfills, and the mismanagement of waste through incineration, resulting in harmful substances which are detrimental to both human health and ecosystems. An urgent paradigm shift towards circular thinking is imperative, in which the conventional concept of “waste” is dissipated, giving way to its reclassification as “raw material”. This transformative approach not only mitigates environmental degradation, but also promotes resource efficiency and sustainability. Adopting this ethic opens avenues for innovative recycling technologies and closed-loop systems, underpinning a sustainable future in which waste is no longer a burden, but rather a valuable asset in the resource ecosystem.

A previous edition of this Special Issue on “Green Chemistry: From Waste to Value-Added Products” has described different methods of waste recovery processes to produce value-added products. This second issue “Green Chemistry: From Wastes to Value-Added Products (2nd Edition)” aims to continue to cover advances in the development and application of processes in this field. Topics include, but are not limited to, the following:

  • Production of medium and small chain fatty acids from organic waste;
  • Production of bioplastics from waste;
  • Production of biofuels and biogas from organic waste materials;
  • Production of hydrogen from waste materials;
  • Production of fuels from waste plastics by cracking, hydrocracking and pyrolysis;
  • Recovery of monomers from plastic waste;
  •  Application and optimization of pyrolysis processes for waste recovery (biowaste, MSW...);
  • Biochar applications (in agriculture, biochar and carbon sequestration...).

Dr. Roberto Palos
Dr. Alazne Gutiérrez
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Processes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • sustainability
  • circular economy
  • recycling technologies
  • closed-loop systems
  • waste management

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Published Papers (2 papers)

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Research

20 pages, 1299 KiB  
Article
Integration of an Autothermal Outer Electrified Reformer Technology for Methanol Production from Biogas: Enhanced Syngas Quality Production and CO2 Capture and Utilization Assessment
by Loretta Salano, Marcello M. Bozzini, Simone Caspani, Giulia Bozzano and Flavio Manenti
Processes 2024, 12(8), 1598; https://doi.org/10.3390/pr12081598 - 30 Jul 2024
Viewed by 756
Abstract
Biogas has emerged as a valid feedstock for biomethanol production from steam reforming. This study investigates an alternative layout based on an auto-thermal electrified reforming assuming a 1 MW equivalent anaerobic digestion plant as a source for methanol synthesis. The process considers an [...] Read more.
Biogas has emerged as a valid feedstock for biomethanol production from steam reforming. This study investigates an alternative layout based on an auto-thermal electrified reforming assuming a 1 MW equivalent anaerobic digestion plant as a source for methanol synthesis. The process considers an oxy-steam combustion of biogas and direct carbon sequestration with the presence of a reverse water–gas shift reactor to convert CO2 and H2 produced by a solid oxide electrolyzer cell to syngas. Thermal auto-sufficiency is ensured for the reverse water–gas shift reaction through the biogas oxy-combustion, and steam production is met with the integration of heat network recovery, with an overall process total electrical demand. This work compares the proposed process of electrification with standard biogas reforming and data available from the literature. To compare the results, some key performance indicators have been introduced, showing a carbon impact of only 0.04 kgCO2/kgMeOH for the electrified process compared to 1.38 kgCO2/kgMeOH in the case of biogas reforming technology. The auto-thermal electrified design allows for the recovery of 66.32% of the carbon available in the biogas, while a similar electrified process for syngas production reported in literature reaches only 15.34%. The overall energy impact of the simulated scenarios shows 94% of the total energy demand for the auto-thermal scenario associated with the electrolyzer. Finally, the introduction of the new layout is taken into consideration based on the country’s carbon intensity, proving carbon neutrality for values lower than 75 gCO2/kWh and demonstrating the role of renewable energies in the industrial application of the process. Full article
(This article belongs to the Special Issue Green Chemistry: From Wastes to Value-Added Products (2nd Edition))
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13 pages, 291 KiB  
Article
Utilizing Used Cooking Oil and Organic Waste: A Sustainable Approach to Soap Production
by Leila Zayed, Natalia Gablo, Ludmila Kalcakova, Simona Dordevic, Ivan Kushkevych, Dani Dordevic and Bohuslava Tremlova
Processes 2024, 12(6), 1279; https://doi.org/10.3390/pr12061279 - 20 Jun 2024
Viewed by 893
Abstract
This research examined the potential for utilizing waste materials generated during the production of dishes/meals and organic waste. Specifically, it evaluated the use of orange peel (OP), spent coffee grounds (SCG), and waste cooking oil in the production of soaps. For the purposes [...] Read more.
This research examined the potential for utilizing waste materials generated during the production of dishes/meals and organic waste. Specifically, it evaluated the use of orange peel (OP), spent coffee grounds (SCG), and waste cooking oil in the production of soaps. For the purposes of this study, homemade soaps were made from used food oils using the cold saponification method using sodium hydroxide. During the soap preparation, spent coffee grounds and orange peel were added to the samples in increasing concentrations of 1%, 2.5%, and 5%. The quality of the individual types of homemade soaps was evaluated on the basis of physicochemical properties such as pH, moisture, total alkalinity, total fatty matter, malondialdehyde content, fat content, foaminess, and hardness. All soaps produced using the cooking oil met the ISO quality criteria and reveal a high TFM content, low moisture content, and also very good foam stability and satisfactory foaming stability. However, no relationship was observed between the use of OP and SCG in soap production and these parameters. However, according to the ABTS test, OP and SCG significantly contributed to the antioxidant properties of the soaps, while SCG-impregnated soaps performed slightly better in this respect. Soaps with SCG also had the highest levels of flavonoids. On the other hand, the fillers used for the soap formulation reduced their hardness. All soaps showed 100% solubility in water, thus confirming the biodegradability of the product. This study demonstrated the novel potential of incorporating waste products like orange peel, spent coffee grounds, and waste cooking oil into homemade soaps, highlighting their contributions to its antioxidant properties and water solubility while ensuring high quality standards. Full article
(This article belongs to the Special Issue Green Chemistry: From Wastes to Value-Added Products (2nd Edition))
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