Use of carbon dioxide as a reaction medium in the thermo-chemical process for the enhanced generation of syngas and tuning adsorption ability of biochar

2016 ◽  
Vol 117 ◽  
pp. 106-114 ◽  
Author(s):  
Dong-Wan Cho ◽  
Eilhann E. Kwon ◽  
Hocheol Song
Keyword(s):  
Carbon Dioxide ◽  
Chemical Process ◽  
Reaction Medium ◽  
Adsorption Ability

scholarly journals The Effect of Polymerization Temperature on the Properties of Polyvinyl Fluoride Polymerization in Supercritical Carbon Dioxide

2021 ◽  
Vol 2101 (1) ◽  
pp. 012063
Author(s):  
Wei Liu ◽  
Yanzhong Zhang ◽  
Huaiyun Chang ◽  
Rong Cai ◽  
Peiliang Ma
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Reaction Medium ◽  
Chemical Processes ◽  
Light Transmittance ◽  
Polymerization Temperature ◽  
Irregular Structure ◽  
Lower Melting Point ◽  
Application Fields ◽  
Supercritical Carbon

Abstract The ongoing search for environmentally friendlier alternative to the organic solvents used in chemical processes has led to the development of technologies based on supercritical carbon dioxide (scCO2), which is non-flammable, non-toxic and relatively inert fluid. Polymer chemistry does not escape this trend. Fluoropolymers prepared in scCO2 have many special properties, which are different from fluoropolymers that use water as the reaction medium, this paper studies the effect of polymerization temperature on polyvinyl fluoride polymerization in supercritical carbon dioxide. The results show that as the polymerization temperature increases, the intrinsic viscosity and shear viscosity of the polymer gradually decreases; at the same time, the increasing of polymerization temperature leads to higher proportion of irregular structure of the polymer, which causes lower melting point and lower crystallinity, and the film prepared by the resin also exhibits a higher visible light transmittance. The above results show that the resin polymerized in supercritical carbon dioxide can impart better performance to conventional polymerization, which expands the potential application fields of the resin.

Highly CO2-Soluble Chelating Agents for Supercritical Extraction and Recovery of Heavy Metals

1994 ◽  
Vol 344 ◽  
Author(s):  
A. Yazdi ◽  
E. J. Beckman
Keyword(s):  
Carbon Dioxide ◽  
Chemical Process ◽  
Chelating Agents ◽  
Main Chain ◽  
Molecular Design ◽  
Metal Extraction ◽  
Extraction Recovery ◽  
Metal Chelating ◽  
Low Toxicity ◽  
Poor Solvent

AbstractCarbon dioxide is an attractive organic solvent in today's chemical process environment in that it is non-flammable, inexpensive, and exhibits low toxicity. Further, materials solubilized in carbon dioxide are easily and completely recovered/concentrated from solution via a simple pressure quench. Despite these favorable properties, CO2 is non-polar, and as such is a very poor solvent for materials such as conventional metal chelating agents, thus blocking application of carbon dioxide in metal extraction/recovery. Consequently, we are exploring the molecular design of materials which are highly CO2-philic, that is, they exhibit solubilities in carbon dioxide which are significantly greater than alkanes with the same number of main-chain atoms. By functionalizing chelating moieties with CO2-philic oligomers, we have generated materials which both effectively extract metals from solid matrices and which dissolve in carbon dioxide in significant quantities.

Distillable ionic liquids for a new multicomponent reaction

2007 ◽  
Vol 79 (11) ◽  
pp. 1869-1877 ◽  
Author(s):  
Anthony E. Rosamilia ◽  
Christopher R. Strauss ◽  
Janet L. Scott
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Multicomponent Reaction ◽  
Reaction Medium ◽  
Building Blocks ◽  
Substituted Anilines ◽  
Reaction Sequence ◽  
Unsaturated Ketones ◽  
Direct Preparation

Adducts of dimethylamine and carbon dioxide form a "distillable ionic liquid" (DIMCARB) that may used as both a reaction medium and catalyst in the direct, atom-economical synthesis of useful synthetic building blocks, such as mono-condensed α,β-unsaturated ketones. The utilization of such building blocks in the synthesis of two new classes of versatile macrocycles, by a sequence of condensation reactions (H2O by-product), is described. Investigation into the mechanism of action of DIMCARB catalysis and observation of an aniline impurity arising from a competing reaction sequence led to development of a new multicomponent reaction for the direct preparation of 2- or 4-substituted anilines. Some of the macrocycles and anilines are, respectively, supramolecular host compounds and ligands for the preparation of metal complexes.

scholarly journals Biodiesel Production Using Supercritical Methanol with Carbon Dioxide and Acetic Acid

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Chao-Yi Wei ◽  
Tzou-Chi Huang ◽  
Ho-Hsien Chen
Keyword(s):  
Carbon Dioxide ◽  
Acetic Acid ◽  
Reaction Temperature ◽  
Methyl Esters ◽  
Reaction Medium ◽  
International Standards ◽  
Biodiesel Production ◽  
Supercritical Methanol ◽  
Optimal Reaction Temperature ◽  
Hydrolysis Of

Transesterification of oils and lipids in supercritical methanol is commonly carried out in the absence of a catalyst. In this work, supercritical methanol, carbon dioxide, and acetic acid were used to produce biodiesel from soybean oil. Supercritical carbon dioxide was added to reduce the reaction temperature and increase the fats dissolved in the reaction medium. Acetic acid was added to reduce the glycerol byproduct and increase the hydrolysis of fatty acids. The Taguchi method was used to identify optimal conditions in the biodiesel production process. With an optimal reaction temperature of 280°C, a methanol-to-oil ratio of 60, and an acetic acid-to-oil ratio of 3, a 97.83% yield of fatty acid methyl esters (FAMEs) was observed after 90 min at a reaction pressure of 20 MPa. While the common approach to biodiesel production results in a glycerol byproduct of about 10% of the yield, the practices reported in this research can reduce the glycerol byproduct by 30.2% and thereby meet international standards requiring a FAME content of >96%.

A Robust Ionic Liquid as Reaction Medium and Efficient Organocatalyst for Carbon Dioxide Fixation

ChemSusChem ◽  
2008 ◽  
Vol 1 (1-2) ◽  
pp. 67-70 ◽  
Author(s):  
Wing-Leung Wong ◽  
Pak-Ho Chan ◽  
Zhong-Yuan Zhou ◽  
Kam-Han Lee ◽  
Kwong-Chak Cheung ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquid ◽  
Reaction Medium ◽  
Carbon Dioxide Fixation
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