Simulation and Optimization on the Process of Acetic Acid Dehydration via Extraction Combined with Azeotropic Distillation

Some azeotropic entrainers in the process of acetic acid dehydration could extract acetic acid from its dilute solution; this text would observe the ability of extraction about these entrainers mentioned in the literatures. By using the EXTRACT module in Aspen Plus, it is found that isopropyl acetate was the most effective extracting agent. The process of acetic acid dehydration via extraction combined with azeotropic distillation by using isopropyl acetate was established. Acetic acid was first extracted from its dilute solution and then was distilled in the azeotropic column, finally acetic acid having 99.8%(weight percent) purity was obtained. This process avoided evaporating a lot of water from the solution, and the entrainer’s existence effectively enhanced the relative volatility between acetic acid and water. The simulation result indicated that when dealing with the acetic acid solution used in this research, the total heat exhaustion was reduced from 11.73MW to 2.98MW and the number of theoretical plates needed in the distillation was also reduced from 65 to 34 compared with simple distillation.

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Recovery of acetic acid from waste streams by extractive distillation

Water Science & Technology ◽

10.2166/wst.2003.0570 ◽

2003 ◽

Vol 47 (10) ◽

pp. 183-188 ◽

Cited By ~ 13

Author(s):

H. Demiral ◽

M. Ercengiz Yildirim

Keyword(s):

Acetic Acid ◽

Feed Rate ◽

Environmental Problem ◽

Azeotropic Distillation ◽

Extractive Distillation ◽

Industrial Wastes ◽

Reflux Ratio ◽

Waste Streams ◽

Relative Volatility ◽

Solvent Type

Wastes have been considered to be a serious worldwide environmental problem in recent years. Because of increasing pollution, these wastes should be treated. However, industrial wastes can contain a number of valuable organic components. Recovery of these components is important economically. Using conventional distillation techniques, the separation of acetic acid and water is both impractical and uneconomical, because it often requires large number of trays and a high reflux ratio. In practice special techniques are used depending on the concentration of acetic acid. Between 30 and 70% (w/w) acetic acid contents, extractive distillation was suggested. Extractive distillation is a multicomponent-rectification method similar in purpose to azeotropic distillation. In extractive distillation, to a binary mixture which is difficult or impossible to separate by ordinary means, a third component termed an entrainer is added which alters the relative volatility of the original constituents, thus permitting the separation. In our department acetic acid is used as a solvent during the obtaining of cobalt(III) acetate from cobalt(II) acetate by an electrochemical method. After the operation, the remaining waste contains acetic acid. In this work, acetic acid which has been found in this waste was recovered by extractive distillation. Adiponitrile and sulfolane were used as high boiling solvents and the effects of solvent feed rate/ solution feed rate ratio and solvent type were investigated. According to the experimental results, it was seem that the recovery of acetic acid from waste streams is possible by extractive distillation.

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Some Approaches to Viscometric Study of Chitosan in Acetic Acid Solution

Chemistry & Chemical Technology ◽

10.23939/chcht10.02.135 ◽

2016 ◽

Vol 10 (2) ◽

pp. 135-139 ◽

Cited By ~ 3

Author(s):

Valentina Chernova ◽

◽

Angela Shurshina ◽

Elena Kulish ◽

Gennady Zaikov ◽

...

Keyword(s):

Acetic Acid ◽

Acid Solution ◽

Intrinsic Viscosity ◽

Acetic Acid Solution ◽

Conformational State ◽

Macromolecular Coil ◽

Degree Of Swelling ◽

Current Value ◽

Viscometric Study

Some ways of estimating the values of the intrinsic viscosity of chitosan were analyzed. It was shown that the method of Irzhak and Baranov for estimating the current value of the intrinsic viscosity allows to adequately estimates the conformational state of the macromolecular coil and its degree of swelling.

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HPLC-UV Method for Determination of Famotidine from Pharmaceutical Products

Revista de Chimie ◽

10.37358/rc.18.2.6093 ◽

2018 ◽

Vol 69 (2) ◽

pp. 297-299

Author(s):

Adriana Nita ◽

Delia Mirela Tit ◽

Lucian Copolovici ◽

Carmen Elena Melinte (Frunzulica) ◽

Dana Maria Copolovici ◽

...

Keyword(s):

Acetic Acid ◽

Quantitative Analysis ◽

Linear Response ◽

Mobile Phase ◽

Acetic Acid Solution ◽

Pharmaceutical Products ◽

Quantification Limit ◽

Validation Parameters ◽

Hplc Analyses

The aim of this study was to develop and validate a rapid, accurate, and exact method for the quantitative determination of famotidine in pharmaceutical products. The HPLC analyses were performed by using a mobile phase containing methanol:1% acetic acid solution=30:7 (v/v), at a flow rate of 0.4 mL/min.The total time of the method was 10 min, and the retention time of famotidine was 4.16 min. The detection was evaluated at l=267 nm. The method has been validated by using different validation parameters. The linear response of the detector for famotidine peak area was observed at concentrations ranging from 0.1 to 0.0001 mg mL-1 , resulting in a correlation coefficient of 0.99998. The values of the detection limit and of the quantification limit are 0.00048 mg mL-1 and 0.00148 mg mL-1, respectively. The method proposed allowed accurate (with a relative error of less than 2%) and precise (RSD values less than 2.0%) determination of famotidine content in pharmaceutical products and can be used for its rapid quantitative analysis.

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Study on the initiation mechanism upon oxidation of methylaromatic hydrocarbons in presence of cobalt acetate and sodium bromide in acetic acid solution

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19752084 ◽

1975 ◽

Vol 40 (7) ◽

pp. 2084-2092 ◽

Cited By ~ 2

Author(s):

S. Ivanov ◽

M. Hinkova

Keyword(s):

Acetic Acid ◽

Acid Solution ◽

Acetic Acid Solution ◽

Cobalt Acetate ◽

Sodium Bromide ◽

Initiation Mechanism

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Kinetic studies on esterification of acetic acid with isopropyl alcohol in presence of novel solid catalyst

International Journal of Chemical Reactor Engineering ◽

10.1515/ijcre-2020-0141 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Mallaiah Mekala

Keyword(s):

Acetic Acid ◽

Kinetic Model ◽

Isopropyl Alcohol ◽

Frequency Factor ◽

Activation Energies ◽

Catalyst Loading ◽

Solid Catalyst ◽

Heat Of Reaction ◽

Resin Catalyst ◽

Isopropyl Acetate

AbstractThe reaction of isopropyl alcohol with acetic acid was carried out in an isothermal batch reactor in presence of solid resin catalyst to produce isopropyl acetate and water. A novel solid resin catalyst Indion 140 was used in the present study. The temperature of reaction mixture was maintained in the range of 333.15 – 363.15 K. The effects of reaction temperature, catalyst loading, mole ratio, size of catalyst, agitation speed were investigated on acetic acid conversion. Further, pseudo-homogeneous kinetic model was developed for the catalyzed reaction. The forward reaction rate constants and activation energies were determined from the Arrhenius plot. The forward and backward activation energies are found to 53,459 J/mol and 54,748 J/mol, respectively. The heat of reaction is −1.289 kJ/mol with Indion 140 catalyst. The mathematical equation was developed for frequency factor as function of the catalyst loading and found that it follows a linear relationship between frequency factor and catalyst loading. The simulations were performed for pseudo homogeneous kinetic model and found that the model is able to predict the experimental data very well. The developed kinetic equation is useful for the simulation of a reactive distillation column for the synthesis of isopropyl acetate.

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Durability of Red Mud Based Geopolymer Paste in Acid Solutions

Materials Science Forum ◽

10.4028/www.scientific.net/msf.866.99 ◽

2016 ◽

Vol 866 ◽

pp. 99-105 ◽

Cited By ~ 3

Author(s):

Smita Singh ◽

M.U. Aswath ◽

R.V. Ranganath

Keyword(s):

Mechanical Properties ◽

Acetic Acid ◽

Fly Ash ◽

Red Mud ◽

Acetic Acid Solution ◽

Strength Loss ◽

Acid Solutions ◽

Test Results ◽

Acid Attack ◽

Geopolymer Paste

The present investigation is on the effect of red mud on the mechanical properties and durability of the geopolymer paste in sulphuric and acetic acid solution. Red mud and fly ash were used to form the geopolymer paste along with the alkalies. The variation of red mud in the paste composition was from 0% to 90%. Cylindrical shaped specimens of 1 inch diameter and 1 inch height were prepared. The specimens were immersed in 5% sulphuric acid and 5% acetic acid for 1, 7, 14, 28, 56 and 84 days and tested for weight loss, visual deformation, strength loss and colour of the solvent, based on the procedure specified by ASTM C 267 – 01. SEM/EDX Tests were performed on the geopolymer specimens. Test results show that initially, the strength of the geopolymer increased upon the addition of red mud. The strength was maximum when the percentage of red mud was 30%. The maximum strength obtained was 38 MPa for the paste containing 30% red mud using 10M alkali solution as against 31.69 MPa, when only fly ash was used. Geopolymer paste containing 30% and 50% red mud showed better resistance to acid attack. The strength loss was minimum for the samples containing 30% red mud in both inorganic and organic acid i.e. sulphuric and acetic acid.

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Enzymatic Synthesis of Isopropyl Acetate by Immobilized Bacillus cereus Lipase in Organic Medium

Enzyme Research ◽

10.4061/2011/919386 ◽

2011 ◽

Vol 2011 ◽

pp. 1-7 ◽

Cited By ~ 21

Author(s):

Madan Lal Verma ◽

Wamik Azmi ◽

Shamsher Singh Kanwar

Keyword(s):

Acetic Acid ◽

Bacillus Cereus ◽

Water Activity ◽

Molecular Sieves ◽

Immobilized Lipase ◽

Molar Ratio ◽

Ester Synthesis ◽

Initial Water ◽

Isopropyl Acetate ◽

Mg Addition

Selective production of fragrance fatty acid ester from isopropanol and acetic acid has been achieved using silica-immobilized lipase of Bacillus cereus MTCC 8372. A purified thermoalkalophilic extracellular lipase was immobilized by adsorption onto the silica. The effects of various parameters like molar ratio of substrates (isopropanol and acetic acid; 25 to 100 mM), concentration of biocatalyst (25–125 mg/mL), reaction time, reaction temperature, organic solvents, molecular sieves, and initial water activity were studied for optimal ester synthesis. Under optimized conditions, 66.0 mM of isopropyl acetate was produced when isopropanol and acetic acid were used at 100 mM: 75 mM in 9 h at 55°C in n-heptane under continuous shaking (160 rpm) using bound lipase (25 mg). Addition of molecular sieves (3 Å × 1.5 mm) resulted in a marked increase in ester synthesis (73.0 mM). Ester synthesis was enhanced by water activity associated with pre-equilibrated saturated salt solution of LiCl. The immobilized lipase retained more than 50% of its activity after the 6th cycle of reuse.

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