Activity model and consistent thermodynamic features for acetic acid–isoamyl alcohol–isoamyl acetate–water reactive system

2013 ◽  
Vol 345 ◽  
pp. 68-80 ◽  
Author(s):  
Wilmar Osorio-Viana ◽  
Miguel Duque-Bernal ◽  
Jesús David Quintero-Arias ◽  
Izabela Dobrosz-Gómez ◽  
Javier Fontalvo ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Isoamyl Alcohol ◽  
Isoamyl Acetate ◽  
Reactive System ◽  
Activity Model

Catalytic Synthesis of Isoamyl Acetate Catalyzed by (NH4)6[MnMo9O32]•8H2O Supported Activated Carbon with Waugh Structure

2013 ◽  
Vol 781-784 ◽  
pp. 190-193
Author(s):  
Mei Xu ◽  
Hua Yuan ◽  
Wei Liu ◽  
Jian Wang ◽  
Feng Zhen Yang
Keyword(s):  
Acetic Acid ◽  
Activated Carbon ◽  
Reaction Time ◽  
Conversion Rate ◽  
Isoamyl Alcohol ◽  
Isoamyl Acetate ◽  
Catalytic Synthesis ◽  
Molar Ratio ◽  
Reaction Conditions ◽  
Optimum Reaction

The synthesis of isoamyl acetate with ammonium 9-molybdate manganese heteropolyacid salt supported activated carbon as catalyst was studied. The optimum reaction conditions are obtained as follows: isoamyl alcohol to acetic acid molar ratio = 1.646, the weight of catalyst is 40% of total weigh, m (acidulate catalyst)=0.2g, m (water carrying reagent toluene) = 3ml, reaction time is about 63 minutes. Selectivity is 100% and conversion rate is 89.48%.

Preparation of Isoamyl Acetate by Reaction-Distillation Using Ionic Liquid as Catalyst

2012 ◽  
Vol 550-553 ◽  
pp. 164-169 ◽  
Author(s):  
Zhen Yu Li ◽  
Hong Yan Tao ◽  
Run Ze Yang
Keyword(s):  
Ionic Liquid ◽  
Acetic Acid ◽  
Isoamyl Alcohol ◽  
Isoamyl Acetate ◽  
Reflux Ratio ◽  
Single Factor ◽  
Azeotropic Point ◽  
Extracting Agents

In this thesis, isoamyl acetate was synthesized by reaction-distillation , using acetic acid and isoamyl alcohol as starting materials, using acid ion-liquid as catalyst and extracting agent.These are some factors were investigated, including different catalysts, ratio between acid and alcohol, amount of Ion-Liquid, and reflux ratio. Technology to prepare iso-pentyl acetate was optimized with single factor experiments. Results showed that acid ion-liquids are good catalysts and extracting agents, which increased the purity and yield of iso-pentyl acetate, as well as diminished the azeotropic point of iso-pentyl acetate and acetic acid.The optimal technological conditions are as following: ratio of acid:alcohol 2:1 (mol), dosage of ion-liquid V = 2 mL, reflux ratio R = 2.5. Under this condition, purity of obtained iso-pentyl acetate is 99%, and the yield is 85%.

scholarly journals Quality Comparison of Hawthorn Wines Fermented by Saccharomyces cerevisiae with and without Pulp Contact and Pectase Treatment

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Wenye Zhang ◽  
Lei Chi ◽  
Yan Wu ◽  
Lei Zhang ◽  
Chunping Xu
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Acetic Acid ◽  
Principal Component ◽  
Isoamyl Alcohol ◽  
Isoamyl Acetate ◽  
Volatile Composition ◽  
Phenylethyl Alcohol ◽  
Ethyl Octanoate ◽  
Ph Decrease ◽  
Alcohol Ethyl

This study evaluated the chemical and volatile composition of hawthorn wines fermented with Saccharomyces cerevisiae A3.12 with and without pulp contact and pectase treatment during fermentation. The results indicated that the addition of pectase was in favor of pH decrease and clarification. The pectase-treated wines had significantly higher concentrations of acetic acid, ethyl octanoate, and isoamyl acetate than the non-enzyme-treated wines. Furthermore, the nonextracted wines had significantly higher concentrations of isoamyl alcohol, phenylethyl alcohol, ethyl lactate, and isoamyl acetate than the extracted wines. The first principal component separated the wine from the nonextracted juice with pectase from other samples based on the higher concentrations of isoamyl acetate (0.14 μg/g), diethyl butanedioate (0.07 μg/g), 2-phenylethyl acetate (0.23 μg/g), and acetoin (1.47 μg/g). The wine from nonextracted pulpy juice with pectase was significantly more aromatic than the others and 26.2% of the consumers were found to be willing to purchase this product.

scholarly journals Esterification of acetic acid with alcohol isoamyl in the presence of enzymatic catalyst

2019 ◽  
Vol 19 (2) ◽  
pp. 225-242
Author(s):  
Nádia Ligianara Nyari ◽  
Alessandro Rogerio Paulazzi ◽  
Raquel Vera Zamadei ◽  
Jamile Zeni ◽  
Rogério Marcos Dallago
Keyword(s):  
Acetic Acid ◽  
Reaction Time ◽  
Food Industry ◽  
Immobilized Lipase ◽  
Isoamyl Alcohol ◽  
Isoamyl Acetate ◽  
Ester Synthesis ◽  
Immobilized Catalyst ◽  
Ultrasound System ◽  
Enzymatic Catalyst

The Candida antarctica Lipase B immobilized on polyurethane catalysed esterification of acetic acid with isoamyl alcohol in mechanical and ultrasonic system in a system solvent-free, was studied. The maximum esterification of isoamyl acetate used immobilized catalyst was the highest esterification, 666.05 U/g with 19 cycles of reuse after 360 minutes of reaction time in mechanical system and 1319.48 U/g was observed and 14 cycles de reuse after 60 minutes of reaction time in ultrasound system. Thus, the process was considered efficient with significant reduction of the reaction time, low instrumental requirements and improve the bioprocess performance. Until now, there were no studies available in the open literature in relation to the ester synthesis catalyzed by immobilized Lipase in polyurethane as support in the ultrasound system. In addition, considered an environmentally correct and economically viable technology, it can be used in cosmetics, pharmaceuticals and food industry.

scholarly journals Estrification of Acetic Acid with Isoamyl Alcohol over Expandable Graphite Catalyst

2008 ◽  
Vol 5 (1) ◽  
pp. 149-154 ◽  
Author(s):  
Xiu-Yan Pang ◽  
Pu Lv ◽  
Yi-Shuang Yang ◽  
Hai-Li Ren ◽  
Fei Gong
Keyword(s):  
Acetic Acid ◽  
Reaction Time ◽  
Orthogonal Experiment ◽  
Isoamyl Alcohol ◽  
Isoamyl Acetate ◽  
Esterification Reaction ◽  
Expandable Graphite ◽  
Diffraction Spectrum ◽  
X Ray Diffraction ◽  
Reaction Conditions

The catalysis of expandable graphite for esterification of acetic acid with isoamyl alcohol has been studied. Expandable graphite was prepared with three different methods. In esterification reaction, the influences of catalyst amount, materials ratio, reaction time, prepared method of the expandable graphite on esterification reaction were discussed. X-ray diffraction spectrum of expandable graphite testified the existence of H2SO4intercalation reaction. Through L9(34) orthogonal experiment, optimum esterification reaction conditions were gained as: n(isoamyl alcohol):n(acetic acid)=1.5:1, w(catalyst with a expandable volume of 290 mL•g-1) = 7.5% total amount of materials, reaction time 1.5 h, and temperature keeping at the boiling point. Yield of isoamyl acetate reachs 96.0%. It was testified that expandable graphite was a kind of effective catalyst in the esterification of acetic acid with isoamyl alcohol.

Measurement of the thermodynamic properties for the reactive system ethylene glycol–acetic acid

2007 ◽  
Vol 258 (2) ◽  
pp. 115-124 ◽  
Author(s):  
Bastian Schmid ◽  
Michael Döker ◽  
Jürgen Gmehling
Keyword(s):  
Acetic Acid ◽  
Thermodynamic Properties ◽  
Ethylene Glycol ◽  
Reactive System

Study on the Synthesis of Isoamyl Acetate Catalyzed by Strong Acidic Cation Exchange Resin

2011 ◽  
Vol 396-398 ◽  
pp. 2411-2415 ◽  
Author(s):  
Ping Lan ◽  
Li Hong Lan ◽  
Tao Xie ◽  
An Ping Liao
Keyword(s):  
Acetic Acid ◽  
Reaction Time ◽  
Cation Exchanger ◽  
Cation Exchange Resin ◽  
Isoamyl Acetate ◽  
Molar Ratio ◽  
Esterification Reaction ◽  
Reaction Conditions ◽  
Optimum Reaction

Isoamyl acetate was synthesized from isoamylol and glacial acetic acid with strong acidic cation exchanger as catalyst. The effects of reaction conditions such as acid-alcohol ratio, reaction time, catalyst dosage to esterification reaction have been investigated and the optimum reaction conditions can be concluded as: the molar ratio of acetic acid to isoamylol 0.8:1, reaction time 2h, 25 % of catalyst (quality of acetic acid as benchmark). The conversion rate can reach up to 75.46%. The catalytic ability didn’t reduce significantly after reusing 10 times and the results showed that the catalyst exhibited preferably catalytic activity and reusability.

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