scholarly journals Comparison of alternative methods for methyl acetate + methanol + acetic acid + acetic anhydride mixture separation

2019 ◽  
Vol 14 (5) ◽  
pp. 51-60
Author(s):  
A. V. Frolkova ◽  
Yu. I. Shashkova ◽  
А. К. Frolkova ◽  
М. A. Mayevskiy
Keyword(s):  
Acetic Acid ◽  
Acetic Anhydride ◽  
Methyl Acetate ◽  
Topological Analysis ◽  
Extractive Distillation ◽  
Alternative Methods ◽  
Local Composition ◽  
Mixture Separation ◽  
Pressure Swing ◽  
Pressure Swing Distillation

Objectives. The paper is a comparative analysis of methyl acetate + methanol + acetic acid + acetic anhydride industrial mixture separation flowsheets based on the use of special distillation methods (extractive distillation and pressure-swing distillation). The results obtained illustrate the variability of the structure of the technological separation flowsheet.Methods. Mathematical modeling using the software package Aspen Plus V. 10.0 was chosen as the research method. The simulation was based on the local composition equation NRTL and the Hayden–O’Connell equation of state. The relative uncertainties of phase equilibrium description do not exceed 3%.Results. The vapor–liquid diagram of the quaternary mixture of methyl acetate + methanol + acetic acid + acetic anhydride was studied using thermodynamic topological analysis. It was shown that the system contains one binary azeotrope and is characterized by one distillation region. Although the structure is not complex, there is a possibility of using several methods for mixture separation: pressure-swing distillation, and extractive distillation with different entrainers. Twelve flowsheets with different structure were proposed, and 29 variants of separation were compared.Conclusions. It was shown that the most perspective structure for the separation of a methyl acetate + methanol + acetic acid + acetic anhydride mixture is a combination of distributed sequence separation and extractive distillation.

Exergoenvironmental Analysis of Tetrahydrofuran/Ethanol Separation through Extractive and Pressure-Swing Distillation

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Patrick Vaz Mangili ◽  
Diego Martinez Prata
Keyword(s):  
Carbon Emissions ◽  
Extractive Distillation ◽  
Exergy Destruction ◽  
Fuel Type ◽  
Ethanol Mixture ◽  
Destruction Rate ◽  
High Boiling Point ◽  
The Difference ◽  
Pressure Swing ◽  
Pressure Swing Distillation

AbstractExtractive distillation uses a high-boiling point solvent for changing the relative volatility of the azeotropic mixture, whereas pressure-swing distillation is based on the difference of operating pressures for such a purpose. In this paper, said separation technologies were applied to a tetrahydrofuran/ethanol mixture and compared with regard to their thermodynamic and environmental performances. The former was assessed by determining the total exergy destruction rate and rational efficiency of each configuration, while the latter was evaluated by estimating their respective indirect carbon emissions. The results showed that the pressure-swing process has not only the lowest exergy destruction rate (383.1 kW) but also the lowest CO2 emission rate (678.7 kg/h), which is mainly due to its lower thermal energy requirements. A sensitivity analysis was then carried out in order to determine how the carbon emissions respond to both the efficiency and the fuel type of the utility boiler.

Production of Anhydrous Ethanol Using Azeotropic Distillation with Petroleum Cuts or Gasoline Pool

2008 ◽  
Vol 59 (2) ◽  
pp. 231-242
Author(s):  
Florin Oprea ◽  
Ionut Stoica
Keyword(s):  
Energy Consumption ◽  
Thermodynamic Model ◽  
Azeotropic Distillation ◽  
Extractive Distillation ◽  
Anhydrous Ethanol ◽  
Continuous Increase ◽  
Commercial Gasoline ◽  
Per Se ◽  
Pressure Swing ◽  
Pressure Swing Distillation

It is now a fact that biofuels have a certain future, whether it is about �biodiesel� or �bioethanol�. EU intends to impose continuous increase of biofuels proportion in commercial products. Ethanol can be used �per se� in commercial gasoline (in different proportions) or can be used instead of methanol in etherification reaction. In both cases it is necessary to use anhydrous ethanol. There are several drying processes: azeotropic distillation, extractive distillation, pressure swing distillation, and adsorption. Present work proposes azeotropic distillation using like entrainer petroleum cuts or commercial gasoline pool. Finally, anhydrous ethanol contains hydrocarbons in several proportions and can be used like commercial gasoline component. The main advantage of this process is that the separation alcohol-hydrocarbons is not so tight, resulting important reducing of the energy consumption in process. There is used a rigorous thermodynamic model as the results are very trusted.

Study on the Separation of Azeotrope of Tetrahydrofuran-Water Using a Combined Method of Extractive and General Distillation

2013 ◽  
Vol 803 ◽  
pp. 149-152 ◽  
Author(s):  
Zhi Dong Fan ◽  
Xu Bin Zhang ◽  
Lu Yang Zhao ◽  
Wang Feng Cai ◽  
Fu Min Wang
Keyword(s):  
Ethylene Glycol ◽  
Boiling Point ◽  
Mass Fraction ◽  
Azeotropic Distillation ◽  
Extractive Distillation ◽  
Combined Method ◽  
Production Water ◽  
Pressure Swing ◽  
Pressure Swing Distillation

As an important solvent, tetrahydrofuran has broad applications. Due to its process of production, water will be mixed into the product and should be removed. However, tetrahydrofuran will form a minimum boiling azeotrope with water, which has a boiling point of 63.4°C, so general distillation can not separate them. Common methods to solve this include extractive distillation, pressure swing distillation, azeotropic distillation, pervaporation and so on. In this experiment, we coupled extractive distillation and general distillation, selecting ethylene glycol as the extractant, and successfully dehydrated the azeotrope. The mass fraction of water is reduced from 18% to less than 500ppm,which matches the requirement.

Comment: Concerning the Cleavage of Tertiary Amines With Acetic Anhydride

1973 ◽  
Vol 51 (13) ◽  
pp. 2177-2179 ◽  
Author(s):  
R. P. Mariella ◽  
K. H. Brown
Keyword(s):  
Acetic Acid ◽  
Acetic Anhydride ◽  
Methyl Acetate ◽  
Tertiary Amines

The failure of methyl-substituted tertiary amines to yield methyl acetate on cleavage by acetic anhydride indicates that the mechanism proposed by Gol'dfarb and Belen'kii cannot be correct. The results of cleavage of cinnamyldimethylamine are offered as support for the mechanism proposed by Mariella and Brown. Catalysis by acetic acid is not considered to be important.

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