scholarly journals Pengaruh Jenis Pelarut Pada Distilasi Ekstraktif Pemisahan Campuran Aseton-Metanol Dengan Dinding Pemisah

Eksergi ◽  
2021 ◽  
Vol 18 (2) ◽  
pp. 77
Author(s):  
Reynardi Risyad Raytama ◽  
Herry Santoso ◽  
Yansen Hartanto
Keyword(s):  
Dimethyl Sulfoxide ◽  
Annual Cost ◽  
Aspen Plus ◽  
Extractive Distillation ◽  
Payback Period ◽  
Total Annual Cost ◽  
Pressure Swing ◽  
Pressure Swing Distillation

Distilasi adalah pemisahan dua campuran atau lebih ke dalam fraksi komponennya dari kemurnian yang diinginkan berdasarkan perbedaan titik didih serta volatilitas antar komponen. Pemisahan dengan metode distilasi biasa tidak efektif untuk memisahkan campuran azeotrop. Oleh karena itu, menggunakan dengan metode pressure swing distillation, azeotrope distillation, dan extractive distillation. Aseton dan metanol merupakan campuran azeotrop yang harus dipisahkan dengan pelarut. Metode yang digunakan adalah distilasi ekstraktif dengan tiga entrainer yaitu air, chlorobenzene, dan dimethyl sulfoxide (DMSO). Kolom distilasi ekstraktif konvensional dapat dimodifikasi menjadi distillation wall column (DWC) dengan menambahkan dinding pemisah untuk mengurangi konsumsi energi dan penghematan biaya. Tujuan penelitian ini adalah menentukan jenis pelarut terbaik pada setiap sistem (kolom distilasi ekstraktif konvensional dan EDWC) dengan membandingan nilai ekonomis (biaya capital, biaya energi, dan nilai total annual cost). Penelitian dilakukan menggunakan Aspen Plus® untuk melakukan simulasi. Simulasi dengan menggunakan kolom dinding pemisah dilakukan dengan tiga kolom karena pada Aspen Plus® tidak tersedia kolom distilasi dengan dinding pemisah. Hasil simulasi menunjukkan bahwa jenis pelarut yang terbaik untuk memisahkan campuran azeotrope aseton dan methanol adalah DMSO dengan menggunakan sistem kolom distilasi ekstraktif konvensional. Biaya capital yang dihasilkan sebesar $653.999/tahun, Biaya Energi $3.245.929/tahun, dan Nilai TAC $3.899.927/tahun (payback period 3 tahun).

scholarly journals Comparison of the Economy and Controllability of Pressure Swing Distillation with Two Energy-Saving Modes for Separating a Binary Azeotrope Containing Lower Alcohols

Processes ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 730
Author(s):  
Lv ◽  
Li ◽  
Zhang ◽  
Huang
Keyword(s):  
Energy Saving ◽  
Simulation Analysis ◽  
Good Control ◽  
Total Annual Cost ◽  
Control Stage ◽  
Binary Azeotrope ◽  
Detailed Simulation ◽  
Pressure Swing ◽  
Pressure Swing Distillation ◽  
Selection Of

The pressure swing distillation (PSD) with two different energy-saving modes are put forward to separate a binary azeotrope containing lower alcohols: benzene/methanol. A comparison of the economy and controllability for the partial and fully heat integrated pressure swing distillation (HIPSD) is made by detailed simulation analysis. The optimal operating parameters of partial and fully HIPSD processes are obtained by minimizing total annual cost (TAC). These results show that the fully HIPSD mode saves 5.88% TAC compared with the partial HIPSD mode. Meanwhile, this paper proposes that the composition slope profile can help to select the temperature control stage (TCS), when the temperature profile in the column is rising rapidly near the bottom and the maximum of temperature slope value occurs in the bottom of the column. Several control structures are developed to check the rationality of the selection of the TCS and evaluate the industrial application. These results illustrate the composition/temperature cascade control structure for the PSD with two energy-saving modes can both get good control performances, and the purities of benzene and methanol can be brought close back to the initial value. However, the fully HIPSD mode can only handle much smaller composition disturbances (<10%) compared with the partial HIPSD mode. Therefore, the selection of energy-saving modes for the separation process should weigh economy against controllability.

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.

scholarly journals Process Simulation of the Separation of Aqueous Acetonitrile Solution by Pressure Swing Distillation

Processes ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 409 ◽  
Author(s):  
Jing Li ◽  
Keliang Wang ◽  
Minglei Lian ◽  
Zhi Li ◽  
Tingzhao Du
Keyword(s):  
Acetonitrile Solution ◽  
Optimum Process ◽  
Total Annual Cost ◽  
Heat Integration ◽  
Reflux Ratio ◽  
Water Mixture ◽  
Aqueous Acetonitrile ◽  
Design Variables ◽  
Pressure Swing ◽  
Pressure Swing Distillation

The separation of aqueous acetonitrile solution by pressure swing distillation (PSD) was simulated and optimized through Aspen Plus software. The distillation sequence of the low pressure column (LPC) and high pressure column (HPC) was determined with a phase diagram. The pressures of the two columns were set to 1 and 4 atm, respectively. Total annual cost (TAC) was considered as the objective function, and design variables, such as the tray number, the reflux ratio, and the feeding position, were optimized. The optimum process parameters were obtained. For the reduction of energy consumption, the PSD with full-heat integration was designed. The TAC of this method is lower by 32.39% of that of the PSD without heat integration. Therefore, it is more economical to separate acetonitrile and water mixture by PSD with full-heat integration, which provides technical support for the separation design of such azeotropes.

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.

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