scholarly journals The Separation of a Binary Water/Ethanol Solution via a Continuous Feed Distillation Column as a Function of Feed Stage Location and Reflux Ratio

2015 ◽  
Vol 4 (12) ◽  
pp. 807-812
Keyword(s):  
Distillation Column ◽  
Ethanol Solution ◽  
Reflux Ratio ◽  
Continuous Feed

Reactive Divided Wall Distillation Column: Simulation and Experiment of Methyl Acetate Hydrolysis

2012 ◽  
Vol 468-471 ◽  
pp. 2785-2789 ◽  
Author(s):  
Yan Wang ◽  
He Xu Ma ◽  
Huai Gong Zhu ◽  
Wei Tang
Keyword(s):  
Methyl Acetate ◽  
Distillation Column ◽  
Reactive Distillation ◽  
Molar Ratio ◽  
Reflux Ratio ◽  
Liquid Distribution ◽  
Divided Wall Column ◽  
New Process ◽  
Simulation And Experiment ◽  
Complex Technology

As a combination of divided wall column (DWC) and reactive-distillation column, the reactive divided wall distillation column is a highly complex technology that reaction and separation can occur simultaneously, which can reduce the energy consumption and decrease the costs of captial and operation. This new process was simulated with PROⅡ software and mini plant experiments were implemented. In addition, we investigated the influences of reflux ratio, liquid distribution ratio and molar ratio of ester in water on the conversion rate of methyl acetate and the purity of the product respectively. It could be seen that the trend from experiments was suitable with simulation results.

Synthesis of High-Purity Methylal by Reactive and Extractive Distillation

2015 ◽  
Vol 723 ◽  
pp. 629-632
Author(s):  
Ji Quan Liu ◽  
Peng Wang
Keyword(s):  
Cation Exchange ◽  
High Purity ◽  
Distillation Column ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Extractive Distillation ◽  
Molar Ratio ◽  
Reflux Ratio ◽  
Optimum Conditions ◽  
Resin Catalyst

The process for production high-purity methylal, which used methanol and formalin in the presence of cation-exchange resin catalyst, was investigated in the reactive and extractive distillation column. Effect of feed mole ratio of formaldehyde in the extracting and reacting section, molar ratio of methanol and formaldehyde, reflux ratio on the content of methylal in the distillate were investigated. The results show that the purity of methylal can reach 99.1% under the optimum conditions.

scholarly journals Minimum reflux ratio and possibility of energy saving on a plate-to-plate heat-integrated distillation column.

1988 ◽  
Vol 31 (1) ◽  
pp. 81-86 ◽  
Author(s):  
Masaru NAKAIWA ◽  
Masaru OWA ◽  
Takaji AKIYA ◽  
Shigetake KAWASAKI ◽  
Masahito SATO ◽  
...  
Keyword(s):  
Energy Saving ◽  
Distillation Column ◽  
Reflux Ratio ◽  
Plate Heat

Study on Recycling of Organic Solvents

2012 ◽  
Vol 610-613 ◽  
pp. 2372-2377
Author(s):  
Run Ze Yang ◽  
Yue Jin Li ◽  
Zhen Yu Li
Keyword(s):  
Organic Solvents ◽  
Distillation Column ◽  
Butyl Acetate ◽  
Separation Efficiency ◽  
Experimental Results ◽  
Reflux Ratio ◽  
Batch Distillation ◽  
Before And After ◽  
Separation Temperature

The research of dimethylbenzene and butylacetate from industrial spent solvent oil by batch distillation was studied, and the batch distillation experiment was by pretreated material. The effects of separation temperature and reflux ratio on separation efficiency were investigated,and compared the new tower with the old one. The experimental results showed that: when the reflux ratio R was 3, Butyl acetate and Xylene product purity were low, the R ≥ 4, the purity of the product of Xylene and Butyl acetate were significantly increased; both yield were lower with the increase of reflux ratio. When R was 4, the top temperature of the distillation column was between 109 and 111.4 °C, before and after device upgrading, Butyl acetate product purity were 90.03% and 72.88% respectively.When the top temperature was above 120 °C, the device after upgrading Xylene product purity was 98% and 94.42% before the upgrading. Both of the purity and the yield improved after device upgrading.

scholarly journals ACETONE RECOVERY USING BATCH DISTILLATION

2019 ◽  
Vol 2 (2) ◽  
pp. 82-98
Author(s):  
Ebrahim Ali Mohamed Hawaidi ◽  
Mustafa T. Yagub ◽  
Riyad Ageli Saleh
Keyword(s):  
Chemical Analysis ◽  
Heat Load ◽  
Distillation Column ◽  
Operating Conditions ◽  
Reflux Ratio ◽  
Column Efficiency ◽  
Batch Distillation ◽  
Acetone Concentration ◽  
Acetone Water ◽  
Mole Percentage

This study focuses on determining the feasibility of obtaining maximum mole percentage of acetone (99 mole%) in the distillate stream from a 3 mole% acetone waste stream using batch distillation. The device which is used in this work has eight trays that will act as the stages of the batch distillation. The effects of varying reflux ratio and heat load (power) on acetone concentration were studied. Moreover, the operating conditions for the bath distillation column such as flooding and weeping with the extreme limits of operation were considered. The temperatures were also be recorded at each tray. The McCabe-Thiele method was used to determine the theoretical number of trays and compared with actual trays (column efficiency). For a chemical analysis of acetone/water compositions a refractometer was used for a chemical analysis, known acetone/water concentrations were analysed and used to construct a calibration curve. The results obtained showed that, the acetone concentration increases with increasing reflux ratio until a highest concentration was reached. Then, the concentration gradually decreases with increasing reflux ratio. However, the distillate stream with 99 mole % acetone was achieved at a reflux ratio of R=3 and at both powers 0.5 kw and 0.7 kw. Finally, the highest overall column efficiency reached by this work was about 75%.

PARAMETRIC INVESTIGATION OF FIXED-TRAY, SEMI-CONTINUOUS DISTILLATION COLUMN FOR ETHANOL SEPARATION FROM WATER

2016 ◽  
Vol 78 (11) ◽  
Author(s):  
Nur Atirah Ibrahim ◽  
Muhammad Abbas Ahmad Zaini
Keyword(s):  
Distillation Column ◽  
Ethanol Concentration ◽  
Fermentation Broth ◽  
Distillation Unit ◽  
Reflux Ratio ◽  
Trial And Error ◽  
Parametric Investigation ◽  
Tray Efficiency ◽  
Continuous Distillation ◽  
Ethanol Separation

This work was aimed to evaluate the parameters affecting the separation of model fermentation broth (7 mole% ethanol) using 10-tray, semi-continuous distillation column. Ethanol compositions in distillate and bottoms were determined at different reflux ratios and feed locations. Results show that the distillation of lower ethanol concentration is better carried out at higher reflux ratio with feed charged at the middle or bottom tray for good overall tray efficiency. The distillation unit is able to purify the feed to 78 mole% ethanol in distillate. Through trial-and-error stepping off, about 81 mole% was predicted as optimum ethanol purity at reflux ratio of 2.33, while a lower reflux ratio of 1.44 was estimated for 78 mole%.  Fixed-tray, semi-continuous distillation is a suitable option to concentrate fermentation broth with sufficient ethanol purity. 

An Analysis of Increasing the Purity of Ethylene Production in the Ethylene Fractionation Column by the Genetic Algorithm

2019 ◽  
Vol 15 (3) ◽  
Author(s):  
Asadollah Karimi ◽  
Hadi Soltani ◽  
Aydin Hasanzadeh
Keyword(s):  
Energy Consumption ◽  
Ethylene Production ◽  
Distillation Column ◽  
Initial Conditions ◽  
Minimum Energy ◽  
Operating Conditions ◽  
Reflux Ratio ◽  
Simulation And Optimization ◽  
Minimum Energy Consumption ◽  
Fractionation Column

AbstractDistillation columns are among the most common fractionation systems with numerous applications in petrochemical units. Hence, the optimization of these columns is a large step in reducing energy consumption and increasing process productivity. This study was, therefore, carried out as a case study of the simulation and optimization of the parameters influencing the ethylene production of the ethylene distillation column in an olefin unit. The two defined objective functions in this research were maximum mass flow of ethylene in the upstream flow of the distillation column and the minimum energy consumption in the distillation column. The optimal operating conditions for the independent variables were estimated using the NSGAII algorithm. The sensitivity analysis of the results was, thereafter, carried out and the optimization results introduced tray no. 71 as the most suitable feed location. In addition, the optimal reflux ratio and the optimal feed flow temperature were 5.26 and −18.49 °C, respectively. In this condition, the upstream ethylene flow rate and energy consumption in the unit increased by approximately 0.74 % and 0.9 % as compared to the initial conditions, respectively.

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