scholarly journals Aldol condensation of acetic acid with formaldehyde to acrylic acid over Cs(Ce, Nd) VPO/SiO2 catalyst

RSC Advances ◽  
2017 ◽  
Vol 7 (76) ◽  
pp. 48475-48485 ◽  
Author(s):  
Aili Wang ◽  
Jing Hu ◽  
Hengbo Yin ◽  
Zhipeng Lu ◽  
Wuping Xue ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Acrylic Acid ◽  
Aldol Condensation

The Cs-, Ce-, and Nd-modified VPO/SiO2 exhibited higher activity for aldol condensation of acetic acid with formaldehyde to acrylic acid.

scholarly journals Acrylic acid synthesis by aldol condensation of acetic acid and formaldehyde on V-Ti-PO4 catalysts

2017 ◽  
Vol 0 (32(1254)) ◽  
pp. 117-122
Author(s):  
Iryna Shpyrka ◽  
Roman Nebesnyi ◽  
Zorian Pikh ◽  
Volodymyr Sydorchuk ◽  
Volodymyr Ivasiv ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Acrylic Acid ◽  
Aldol Condensation ◽  
Acid Synthesis

Aldol condensation of acetic acid and formaldehyde to acrylic acid over a hydrothermally treated silica gel-supported B-P-V-W oxide

2020 ◽  
Vol 594 ◽  
pp. 117472 ◽  
Author(s):  
R. Nebesnyi ◽  
Z. Pikh ◽  
V. Sydorchuk ◽  
S. Khalameida ◽  
I. Kubitska ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Acrylic Acid ◽  
Silica Gel ◽  
Aldol Condensation

Aldol condensation of acetic acid with formaldehyde to acrylic acid over SiO2-, SBA-15-, and HZSM-5-supported V-P-O catalysts

2016 ◽  
Vol 40 ◽  
pp. 145-151 ◽  
Author(s):  
Jing Hu ◽  
Zhipeng Lu ◽  
Hengbo Yin ◽  
Wuping Xue ◽  
Aili Wang ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Acrylic Acid ◽  
Aldol Condensation

scholarly journals Effect of Support Nature on the Efficiency of B–P–V–W–Ox Catalysts of Acrylic Acid Synthesis with Aldol Condensation of Acetic Acid with Formaldehyde

2019 ◽  
Author(s):  
Roman Nebesnyi ◽  
Iryna Kubitska ◽  
Oksana Orobchuk ◽  
Volodymyr Ivasiv ◽  
Volodymyr Sydorchuk ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Acrylic Acid ◽  
Aldol Condensation ◽  
Acid Synthesis ◽  
Effect Of Support

scholarly journals Effect of metal-doped VPO catalysts for the aldol condensation of acetic acid and formaldehyde to acrylic acid

RSC Advances ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 5958-5966 ◽  
Author(s):  
Yumeng Wang ◽  
Yuelin Hou ◽  
Xue Hao ◽  
Zhenlu Wang ◽  
Wanchun Zhu
Keyword(s):  
Acetic Acid ◽  
Acrylic Acid ◽  
Active Site ◽  
Aldol Condensation ◽  
Catalytic Performance ◽  
Moderate Amount ◽  
Vpo Catalysts ◽  
Metal Doped

The acidity of the catalyst is a major factor affecting the catalytic performance of the catalyst. It is presumed that B acid is the main active site of this reaction, and a moderate amount of acid is favorable to facilitate the reaction.

scholarly journals Kinetics of aldol condensation of acetic acid with formaldehyde on B–P–V–W–OX/SiO2 catalyst

2020 ◽  
Vol 3 (2) ◽  
pp. 39-45
Author(s):  
N. S. Pavliuk ◽  
◽  
V. V. Ivasiv ◽  
O. M. Orobchuk ◽  
D. S. Shevchenko ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Chemical Composition ◽  
Acrylic Acid ◽  
Gas Phase ◽  
Silicon Oxide ◽  
Aldol Condensation ◽  
Condensation Reaction ◽  
Kinetic Equations ◽  
Stable Chemical ◽  
Kinetics Of

New catalysts B–P–V–W–Ox/SiO2 of gas-phase condensation of acetic acid from formaldehyde to acrylic acid on an industrial carrier of stable chemical composition (colloidal silicon oxide, Aerosil A-200) were synthesized. It is shown that the hydrothermal treatment of the carrier allows to increase the activity and selectivity of the catalyst in the reactions of aldol condensation of acetic acid with formaldehyde. It was found that the developed catalyst is effective in the condensation reaction of acetic acid with formaldehyde, which allows to obtain acrylic acid with a yield of 68.7% and a selectivity of 94.1%. The kinetic regularities of the reaction on this catalyst are established. According to the proposed kinetic equations, kinetic parameters are calculated that describe the condensation reaction of acetic acid with formaldehyde.

The use of catalyst to enhance the wet oxidation process

2007 ◽  
Vol 55 (12) ◽  
pp. 189-193 ◽  
Author(s):  
C. Maugans ◽  
B. Kumfer
Keyword(s):  
Acetic Acid ◽  
Catalytic Activity ◽  
Acrylic Acid ◽  
Oxidation Process ◽  
Wet Oxidation ◽  
Test Results ◽  
Pure Compound ◽  
Spent Caustic

Wet oxidation tests were performed on two pure compound streams: acetic acid and ammonia; and on two wastewater streams: acrylic acid wastewater and sulphide laden spent caustic. Test results showed that Mn/Ce and Pt/TiO2 were effective catalysts that greatly enhanced acetic acid, ammonia and acrylic acid wastewater destruction. However, the Mn/Ce catalyst performance appears to be inhibited by concentrated salts dissolved in solution. This could limit the applicability of this catalyst for the treatment of brackish wastewaters. Zr, Ce and Ce nanoparticles were also shown to exhibit some catalytic activity, however not to the extent of the Mn/Ce and the Pt/TiO2.

scholarly journals Syn-selective silicon Mukaiyama-type aldol reactions of (pentafluoro-λ6-sulfanyl)acetic acid esters with aldehydes

2018 ◽  
Vol 14 ◽  
pp. 373-380 ◽  
Author(s):  
Anna-Lena Dreier ◽  
Andrej V Matsnev ◽  
Joseph S Thrasher ◽  
Günter Haufe
Keyword(s):  
Acetic Acid ◽  
Aldol Condensation ◽  
Aldol Reactions ◽  
Complex Structures ◽  
Bond Forming ◽  
Hydroxyalkanoic Acid ◽  
Mukaiyama Aldol ◽  
Substituted Benzaldehydes ◽  
Acetic Acid Esters ◽  
Acid Esters

Aldol reactions belong to the most frequently used C–C bond forming transformations utilized particularly for the construction of complex structures. The selectivity of these reactions depends on the geometry of the intermediate enolates. Here, we have reacted octyl pentafluoro-λ6-sulfanylacetate with substituted benzaldehydes and acetaldehyde under the conditions of the silicon-mediated Mukaiyama aldol reaction. The transformations proceeded with high diastereoselectivity. In case of benzaldehydes with electron-withdrawing substituents in the para-position, syn-α-SF5-β-hydroxyalkanoic acid esters were produced. The reaction was also successful with meta-substituted benzaldehydes and o-fluorobenzaldehyde. In contrast, p-methyl-, p-methoxy-, and p-ethoxybenzaldehydes led selectively to aldol condensation products with (E)-configured double bonds in 30–40% yields. In preliminary experiments with an SF5-substituted acetic acid morpholide and p-nitrobenzaldehyde, a low amount of an aldol product was formed under similar conditions.

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