Carbon Dioxide

Pierantozzi, Ronald

doi:10.1002/0471238961.0301180216090518.a01

Cited by 4 publications

(4 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Toluene is a byproduct generated from steam cracking of crude oil . Carbon dioxide is made as a byproduct from the water–gas shift reaction during ammonia synthesis . In the GaBi process model, the environmental impacts stemming from the mining of the catalytic metals (cobalt and rhodium) were not considered due to a lack of information and the fact that the consumption of these catalytic metals is rather small compared to amounts of the other raw materials.…”

Section: Methodsmentioning

confidence: 99%

Development of a Greener Hydroformylation Process Guided by Quantitative Sustainability Assessments

Xie

Subramaniam

2014

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Environmental impacts and economics associated with a potentially greener, Rh-catalyzed, 1-octene hydroformylation process in CO 2 -expanded liquid (CXL) medium are quantitatively assessed against a conventional Cocatalyzed process. The economic analysis shows a more than 30% lower capital investment for the CXL process compared to the conventional Co-catalyzed process of similar capacity. This is due to the higher reaction and catalyst recovery efficiencies at milder reaction temperature and pressures (compared to the conventional process) used in the CXL process. The total production cost (TPC) associated with the CXL process is lower than the conventional process when the Rh makeup rate is lower than 0.94% (of the total amount of Rh in the reactor) per hour at the current Rh price ($20,800/ lb). This translates to an economic viability criterion of ($makeup Rh/$TPC) being 0.042 or less. Life cycle analysis (LCA) was performed using GaBi software and an EIO-LCA method based on plant scale simulation of both the conventional and continuous CXL processes to produce 150 kton/year of nonanal. Gate-to-gate LCA projections show that the CXL process is environmentally friendlier than the conventional process in most impact categories such as ecotoxicity, greenhouse gas emissions, and smog formation. Predicted emissions for the conventional process are of the same order of magnitude as those reported from an actual plant of similar capacity. Cradle-to-gate environmental impacts are 1 to 2 orders of magnitude greater than the gate-to-gate impacts with energy usage for the production of raw materials being the major source of adverse environmental impacts. The EIO-LCA results agree with the GaBi analysis. Our results show that the environmental performance of the CXL process can be further improved with lower solvent usage, thus also providing valuable guidance for process optimization.

show abstract

Section: Methodsmentioning

confidence: 99%

Development of a Greener Hydroformylation Process Guided by Quantitative Sustainability Assessments

Xie

Subramaniam

2014

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…On the one hand, Feher investigated the simple recuperated supercritical cycle (see Figure 2a) and performed a sensitivity assessment to the main operating parameters (maximum cycle temperature, minimum cycle temperature and minimum cycle pressure) as well as to the performance of the individual components (recuperator effectiveness, and turbomachinery isentropic efficiency). The reasons for considering supercritical CO 2 as alternative working fluid were, and remain, multiple: high thermal stability, low chemical reactivity, abundant in nature, non-flammable and inexpensive [17]. Nevertheless, its differential features are the critical temperature and pressure at 31.04 • C and 73.83 bar, respectively.…”

Section: Supercritical Co 2 Power Cycles: History and Fundamentals Of...mentioning

confidence: 99%

Supercritical Carbon Dioxide Cycles for Concentrated Solar Power Plants: A Possible Alternative for Solar Desalination

et al. 2021

View full text Add to dashboard Cite

This manuscript investigates the supercritical carbon dioxide (sCO2) power cycle employed in the power block of concentrated solar power (CSP) plants—solar tower—as an alternative for solar desalination, developed with either distillation or reverse osmosis. This concept is investigated as a possible up-scaling of the SOLMIDEFF project, originally based on a hot-air micro gas turbine combined with a solar dish collector. For the upscaled concept, five different sCO2 cycles are considered, chosen amongst the best-performing configurations proposed in the literature for CSP applications, and modelled with Thermoflex software. The influence of ambient conditions is studied, considering two minimum cycle temperatures (35 °C and 50 °C), corresponding to Santa Cruz de Tenerife and Abu Dhabi, respectively. The results show that the low temperatures at the inlet of the heat rejection unit compromise the viability of distillation technologies. On the other hand, the high thermal efficiency achieved by these cycles, especially with the recompression and partial cooling layouts, reduces the specific energy consumption when combined with reverse osmosis (RO), below that of photovoltaic (PV)+RO. Feed-water preheating is explored as a solution to further reduce energy consumption, concluding that its actual interest is not clear and strongly depends on the location considered and the corresponding water quality standards.

show abstract

“…Carbon dioxide (CO 2 ), as an indispensable component of the atmosphere, plays important roles in the carbon cycle of the biosphere and has huge impacts on the global climate and human health. , It is involved in many vital biological processes, such as photosynthesis, respiration, CO 2 transport, and so on. Many detailed studies − on CO 2 are those that involve bioreactions and processes, especially with respect to how CO 2 is fixed by enzymes and protein-aggregates found in cells.…”

Section: Introductionmentioning

confidence: 99%

Oxazolidine Transient Bases as Molecular Platforms for Testing Dynamic CO₂ Capture in Biochemical Systems

et al. 2018

View full text Add to dashboard Cite

Understanding the dynamic processes of CO 2 capture in biosystems is important because of the great effect CO 2 has on the carbon cycle, human health, the global climate, and living environments. After years of multidisciplinary studies, researchers have gained only basic mechanistic knowledge about how enzymes or protein-aggregates capture and deliver CO 2 , a process involving reversible bonding of CO 2 with basic amino acid residues. However, vital mechanistic details of how the activated basic residues within these enzymes or protein-aggregates are initially formed, a crucial step for CO 2 capture, are still lacking. Herein, we designed specific molecules, i.e., oxazolidines, which are able to reversibly change their alkalinity via ultrafast isomerizations. Serving as so-called transient bases, these oxazolidines mimic the activated/deactivated states of enzymes or protein-aggregates responsible for dynamic CO 2 capture/release. A detailed mechanism for CO 2 capture, which involves dynamic covalent bonding and multimolecular cooperative interactions among functional groups that occur with the help of a polyhydroxyl environment, is demonstrated by UV−vis and multiple NMR spectroscopies as well as theoretical calculations. Using suitable oxazolidine transient bases, applications for visual CO 2 detection under different detection limit requirements were also developed. Insights for further understanding the process of dynamic CO 2 capture in biosystems are also discussed. This oxazolidine-inspired biomimetic CO 2 capture serves as a platform for the future development of additional biomimicking systems, as well as offers unique perspectives for other complicated life processes.

show abstract

Carbon Dioxide

Cited by 4 publications

References 14 publications

Development of a Greener Hydroformylation Process Guided by Quantitative Sustainability Assessments

Development of a Greener Hydroformylation Process Guided by Quantitative Sustainability Assessments

Supercritical Carbon Dioxide Cycles for Concentrated Solar Power Plants: A Possible Alternative for Solar Desalination

Oxazolidine Transient Bases as Molecular Platforms for Testing Dynamic CO₂ Capture in Biochemical Systems

Contact Info

Product

Resources

About

Carbon Dioxide

Cited by 4 publications

References 14 publications

Development of a Greener Hydroformylation Process Guided by Quantitative Sustainability Assessments

Development of a Greener Hydroformylation Process Guided by Quantitative Sustainability Assessments

Supercritical Carbon Dioxide Cycles for Concentrated Solar Power Plants: A Possible Alternative for Solar Desalination

Oxazolidine Transient Bases as Molecular Platforms for Testing Dynamic CO2 Capture in Biochemical Systems

Contact Info

Product

Resources

About

Oxazolidine Transient Bases as Molecular Platforms for Testing Dynamic CO₂ Capture in Biochemical Systems