Solvent-free catalytic deoxygenation of oleic acid via nano-Ni/HZSM-5: Effect of reaction medium and coke characterization

2018 ◽  
Vol 179 ◽  
pp. 324-333 ◽  
Author(s):  
Shiyou Xing ◽  
Pengmei Lv ◽  
Che Zhao ◽  
Ming Li ◽  
Lingmei Yang ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Reaction Medium ◽  
Solvent Free ◽  
Coke Characterization ◽  
Catalytic Deoxygenation

Room Temperature Solvent-Free Synthesis of Monodisperse Magnetite Nanocrystals

2006 ◽  
Vol 6 (3) ◽  
pp. 852-856 ◽  
Author(s):  
X. R. Ye ◽  
C. Daraio ◽  
C. Wang ◽  
J. B. Talbot ◽  
S. Jin
Keyword(s):  
Oleic Acid ◽  
Solid State ◽  
Large Scale ◽  
Room Temperature ◽  
Solvent Free ◽  
Two Dimensional ◽  
New Process ◽  
High Boiling Point ◽  
Magnetite Nanocrystals ◽  
Solvent Free Synthesis

We have successfully demonstrated a facile, solvent-free synthesis of highly crystalline and monodisperse Fe3O4 nanocrystallites at ambient temperature avoiding any heating. Solid state reaction of inorganic Fe(II) and Fe(III) salts with NaOH was found to produce highly crystalline Fe3O4 nanoparticles. The reaction, if carried out in the presence of surfactant such as oleic acid–oleylamine adduct, generated monodisperse Fe3O4 nanocrystals extractable directly from the reaction mixture. The extracted nanoparticles were capable of forming self-assembled, two-dimensional and uniform periodic array. The new process utilizes inexpensive and nontoxic starting materials, and does not require a use of high boiling point and toxic solvents, thus is amenable to an environmentally desirable, large-scale synthesis of nanocrystals.

Reactivity and selectivity under microwaves in organic chemistry. Relation with medium effects and reaction mechanisms

2001 ◽  
Vol 73 (1) ◽  
pp. 161-166 ◽  
Author(s):  
André Loupy ◽  
Laurence Perreux ◽  
Marion Liagre ◽  
Karine Burle ◽  
Michel Moneuse
Keyword(s):  
Organic Chemistry ◽  
Reaction Mechanisms ◽  
Reaction Medium ◽  
Solvent Free ◽  
Microwave Activation ◽  
Medium Effects ◽  
Specific Effects ◽  
Solvent Free Conditions

Typical applications of solvent-free conditions and microwave activation are described. Non-purely thermal specific effects are evidenced and discussed in terms of reaction medium and mechanisms, taking into account the variations in polarity of the systems.

scholarly journals Conversion of Oleic Acid into Azelaic and Pelargonic Acid by a Chemo-Enzymatic Route

Molecules ◽  
2020 ◽  
Vol 25 (8) ◽  
pp. 1882 ◽  
Author(s):  
Elisabetta Brenna ◽  
Danilo Colombo ◽  
Giuseppe Di Lecce ◽  
Francesco G. Gatti ◽  
Maria Chiara Ghezzi ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Azelaic Acid ◽  
Atmospheric Oxygen ◽  
Reaction Medium ◽  
Chemical Oxidation ◽  
Pelargonic Acid ◽  
Dihydroxystearic Acid ◽  
Chemical Purity ◽  
Enzymatic Route

A chemo-enzymatic approach for the conversion of oleic acid into azelaic and pelargonic acid is herein described. It represents a sustainable alternative to ozonolysis, currently employed at the industrial scale to perform the reaction. Azelaic acid is produced in high chemical purity in 44% isolation yield after three steps, avoiding column chromatography purifications. In the first step, the lipase-mediated generation of peroleic acid in the presence of 35% H2O2 is employed for the self-epoxidation of the unsaturated acid to the corresponding oxirane derivative. This intermediate is submitted to in situ acid-catalyzed opening, to afford 9,10-dihydroxystearic acid, which readily crystallizes from the reaction medium. The chemical oxidation of the diol derivative, using atmospheric oxygen as a stoichiometric oxidant with catalytic quantities of Fe(NO3)3∙9∙H2O, (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO), and NaCl, affords 9,10-dioxostearic acid which is cleaved by the action of 35% H2O2 in mild conditions, without requiring any catalyst, to give pelargonic and azelaic acid.

Catalytic deoxygenation of oleic acid over a Ni-CeZrO2 catalyst

Fuel ◽  
2019 ◽  
Vol 258 ◽  
pp. 116179 ◽  
Author(s):  
Kyung-Won Jeon ◽  
Hyun-Suk Na ◽  
Yeol-Lim Lee ◽  
Seon-Yong Ahn ◽  
Kyoung-Jin Kim ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Catalytic Deoxygenation

scholarly journals Consecutive reactions in an oleic acid and acetic anhydride reaction medium

2009 ◽  
Vol 111 (7) ◽  
pp. 723-729 ◽  
Author(s):  
Jerome Peydecastaing ◽  
Carlos Vaca-Garcia ◽  
Elisabeth Borredon
Keyword(s):  
Oleic Acid ◽  
Acetic Anhydride ◽  
Reaction Medium ◽  
Consecutive Reactions

scholarly journals Continuous Catalyst-Free Esterification of Oleic Acid in Compressed Ethanol

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Ana Carolina de Araujo Abdala ◽  
Vitor Augusto dos Santos Garcia ◽  
Caroline Portilho Trentini ◽  
Lúcio Cardozo Filho ◽  
Edson Antonio da Silva ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Residence Time ◽  
Tubular Reactor ◽  
Reaction Medium ◽  
Ethyl Esters ◽  
Molar Ratio ◽  
Molar Ratios ◽  
Catalyst Free ◽  
Free Process ◽  
Positive Effect

The esterification of oleic acid in a continuous catalyst-free process using compressed ethanol was investigated in the present study. Experiments were performed in a tubular reactor and variables investigated were temperature, pressure, and oleic acid to ethanol molar ratio for different residence time. Results demonstrated that temperature, in the range of 473 K to 573 K, and pressure had a positive effect on fatty acid ethyl esters (FAEE) production. In the experimental range investigated, high conversions can be obtained at low ethanol concentrations in the reaction medium and it was observed that oleic acid to ethanol molar ratios greater than 1 : 6 show no significant increase in conversion. Nonnegligible reaction conversions (>90%) were achieved at 573 K, 20 MPa, oleic acid to ethanol molar ratio of 1 : 6, and 20 minutes of residence time.

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