•A model is developed to represent the supply chain of renewable methanol in Mexico.•The model considers multiple potential residues to be used as raw materials.•The supply chain is optimized in ...terms of economic, environmental, and social objectives.•The use of captured carbon dioxide as raw material significantly reduces the environmental objective.
Methanol is one of the most important chemical compounds, as it is the basis for producing a wide variety of derivatives. Its production through fossil sources such as natural gas in countries like Mexico is not entirely viable due to the fluctuations in the availability of this resource. The use of renewable sources to produce methanol represents an interesting area of opportunity to reduce the dependence on a single raw material. This work proposes the design of the methanol supply chain in Mexico using residual materials, finding a solution with the best compromise between profit, social impact, and CO2 emissions. The solution with the best compromise corresponds to a profit of 7,334,100 USD/y, a marginalization index of 2592.536 and CO2 emissions of -0.021 Mt/y. This solution has 8 different types of raw materials, 18 process plants and the use of three processing technologies: gasification, anaerobic digestion, and catalysis from CO2.
Wood-based panels play an important role in the furniture and decoration industries worldwide. However, the adhesives used in the manufacture of those panels are a subject of concern. Therefore, the ...aim of this study is twofold: (i) to critically analyze the available reports on the formulation of bio-based adhesives for the manufacture of wood panels, evaluating the different renewable raw material options, and (ii) to identify the advantages, disadvantages and difficulties encountered that hinder further development. For this purpose, the Methodi Ordinatio was used to assist identifying high impact research on the topic, and the VOSviewer software was used for analyzing the co-occurrence of keywords. Visual graphs were used to discuss the main research themes, type of study, publications per year, and publications per journal. This served to draw on the main aspects of the referenced body of literature. This review provides a rationale for showing the suitability of the methodological approaches and research designs used, as well as the production of bio-adhesives under the premises of synthesis routes, techniques and procedures. In view of the potential development of bio-adhesives with the prospect of market implementation, two approaches are essential to ensure a step forward in their development at full scale, namely techno-economic analysis and the assessment of the environmental profile associated with the production of bio-adhesives based on the life cycle assessment methodology.
•Critical analysis of bio-based adhesives in the manufacture of wood-based panels.•There is a range of experimental studies, but few literature reviews and patents.•Soybean seems to be the renewable raw material of highlight for bio-based adhesives.•Further analysis from a life cycle perspective is needed.
Oligo and polyesters of polyglycerol and polyricinoleic acid are widely used as emulsifiers in various industries. New promising emulsifiers for oil–water systems were obtained based on the ...condensation of glycerol and its oligomers with epoxidized derivatives of vegetable oils. The type of the resulting emulsion was studied. The influence of the composition of the emulsion and the hydrophilic–lipophilic balance (HLB) of the emulsifier on the type of the resulting emulsions was investigated. It was shown that the synthesized emulsifiers significantly increase the viscosity of the emulsion. Complex structural and functional spectral analysis of synthesized substances showed that the main reactions leading to the formation of the desired products were the opening of epoxide cycles, the transesterification of esters, and the condensation of fatty‐acid derivatives. This new combination of renewable raw materials is of undoubted interest for deeper chemical processing of vegetable oils.
For a long time polymers have supplied most of common packaging materials because they present several desired features like softness, lightness and transparency. However, increased use of synthetic ...packaging films has led to a serious ecological problems due to their total non-biodegradability. Although their complete replacement with eco-friendly packaging films is just impossible to achieve, at least for specific applications like food packaging the use of bioplastics should be the future. The aim of this review was to offer a complete view of the state of the art on biodegradable polymer packages for food application.
The utilization of agriculture waste-based adsorbents in the treatment of real industrial wastewater represents an unexplored frontier with significant potential. In this study, the cobalt ...ferrite-supported activated carbon derived from orange peels (CF40-AC) was used as a magnetic adsorbent for the treatment of real pulp and paper mill effluent (PPME). Detailed insights into the properties and functionalities of the CoFe2O4-AC adsorbent were obtained through an accurate characterization analysis that included X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX), BET and pore size histogram techniques. Both pure activated carbon (AC) and CF40-AC displayed excellent textural properties with surface area (SBET) equal 2014 and 1345 m2.g−1, respectively. TEM and SEM images display that the magnetic ferrites were well dispersed on the surface of AC. Following the characterization process, the CoFe2O4-AC adsorbent was evaluated for its ability to remove several key pollutants from PPME, including chemical oxygen demand (COD), total dissolved solids (TDS) and turbidity. Moreover, various operational parameters, such as pH, adsorbent dosage, contact time, and stirring rate, were investigated to achieve optimal contaminants removal rates. Remarkably, the CoFe2O4-AC adsorbent demonstrated highly efficient removal rates, with 86.9%, 59,9% and 93.1% for COD, TDS and turbidity, respectively, under optimal conditions (pH 7, adsorbent dose 0.4 gm, contact time 60 min, and stirring rate 150 rpm). The CoFe2O4-AC composite material exhibits promising potential for multiple applications reached 5 cycles without a significant loss in its adsorption or functional properties over successive uses. These results favor the promising potential of CoFe2O4-AC as a sustainable and efficient solution for addressing wastewater treatment challenges in the pulp and paper industry, contributing to both environmental protection and resource conservation.
Green and Bio-Based Solvents Calvo-Flores, Francisco G.; Monteagudo-Arrebola, María José; Dobado, José A. ...
Topics in current chemistry (2016),
06/2018, Letnik:
376, Številka:
3
Journal Article
Recenzirano
Chemical reactions and many of the procedures of separation and purification employed in industry, research or chemistry teaching utilize solvents massively. In the last decades, with the birth of ...Green Chemistry, concerns about the employment of solvents and the effects on human health, as well as its environmental impacts and its dependence on non-renewable raw materials for manufacturing most of them, has drawn the attention of the scientific community. In this work, we review the concept of green solvent and the properties and characteristics to be considered green. Additionally, we discuss the different possible routes to prepare many solvents from biomass, as an alternative way to those methods currently applied in the petrochemical industry.
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•We present the minimum selling price of biodiesel produced from SCGs.•The process is economically unattractive as economies of scale can not be exploited.•Further research in the ...co-production of high added value bioactive compounds is deemed necessary.•The environmental performance of the process is among the most promising that have been reported.
The valorization of the spent coffee grounds (SCGs) has attracted a lot of attention recently from both the academia and industry. The development of an economically attractive and environmentally sustainable process based on available experimental data on the SCGs valorization has not been investigated in the open literature. This is clearly a very important issue and is the subject of the present work. Evidence is presented to support the conclusion that the economic performance of the process can be acceptable only at large production capacities realized at centralized facilities. In addition, it is shown, using a “gate-to-gate” Life Cycle Assessment (LCI), that the environmental performance of the process is acceptable and the process can be considered sustainable. Further research is necessary in the area of efficient recovery of the bioactive compounds available in SCGs. These compounds have a significant added value that can render the process economically attractive at capacities that are low enough to be practically realizable.
Decreasing arable land, rising urbanization, water scarcity, and climate change exert pressure on agricultural producers. Moving from soil to soilless culture systems can improve water use ...efficiency, especially in closed-loop systems with a recirculating water/nutrient solution that recaptures the drain water for reuse. However, the question of alternative materials to peat and rockwool, as horticultural substrates, has become increasingly important, due to the despoiling of ecologically important peat bog areas and a pervasive waste problem. In this paper, we provide a comprehensive critical review of current developments in soilless culture, growing media, and future options of using different materials other than peat and rockwool. Apart from growing media properties and their performance from the point of view of plant production, economic and environmental factors are also important. Climate change, CO2 emissions, and other ecological issues will determine and drive the development of soilless culture systems and the choice of growing media in the near future. Bioresources, e.g., treated and untreated waste, as well as renewable raw materials, have great potential to be used as growing media constituents and stand-alone substrates. A waste management strategy aimed at reducing, reusing, and recycling should be further and stronger applied in soilless culture systems. We concluded that the growing media of the future must be available, affordable, and sustainable and meet both quality and environmental requirements from growers and society, respectively.
In this study polyurethane (PU) residues were mixed with residues of textile fibers (cotton, wool and synthetic fibers up to 70 wt/wt) to produce 100% recycled composites. In addition, the effect of ...the type of fiber on the performance of the ensuing composites was evaluated. The presence of fibers showed similar effect on the density, reducing the density in the 5.5-9.0% range. In a similar manner, the addition of fillers decreased their thermal conductivity. The 70 wt/wt wool composite presented 38.1% lower thermal conductivity when compared to the neat matrix, a reduction that was similar for the other type of fibers. Moreover, the presence of fillers yields stiffer materials, especially in the case of the Wool based composites, which with 70 wt/wt of filler content increased the tensile modulus of the ensuing material 3.4 times. This was attributed to the aspect ratio and stiffness of this type of fiber. Finally, the high-water absorption and lower thermal stability observed, especially in the case of the natural fibers, was associated with the hydrophilic nature of fibers and porosity of composites. Overall, the results suggest that these textile-based composites are suitable for construction and automotive applications, with the advantage of being produced from 100% recycled raw-materials, without compromised performance.
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