scholarly journals Design of Batch Distillation Columns Using Short-Cut Method at Constant Reflux

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
Asteria Narvaez-Garcia ◽  
Jose del Carmen Zavala-Loria ◽  
Luis Enrique Vilchis-Bravo ◽  
Jose Antonio Rocha-Uribe
Keyword(s):  
Mole Fraction ◽  
Annual Cost ◽  
Quality Index ◽  
Distillation Column ◽  
Total Annual Cost ◽  
Reflux Ratio ◽  
Batch Distillation ◽  
Distillation Columns ◽  
Cut Method ◽  
Quality Indexes

A short-cut method for batch distillation columns working at constant reflux was applied to solve a problem of four components that needed to be separated and purified to a mole fraction of 0.97 or better. Distillation columns with 10, 20, 30, 40, and 50 theoretical stages were used; reflux ratio was varied between 2 and 20. Three quality indexes were used and compared: Luyben’s capacity factor, total annual cost, and annual profit. The best combinations of theoretical stages and reflux ratio were obtained for each method. It was found that the best combinations always required reflux ratios close to the minimum. Overall, annual profit was the best quality index, while the best combination was a distillation column with 30 stages, and reflux ratio’s of 2.0 for separation of benzene (i), 5.0 for the separation of toluene (ii), and 20 for the separation of ethylbenzene (iii) and purification of o-xylene (iv).

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 Optimization and technical-economic analysis of the production of 5-hydroxymethylfurfural from glucose / Otimização e análise técnico-econômica da produção de 5-hidroximetilfurfural a partir da glicose

2021 ◽  
Vol 7 (12) ◽  
pp. 120240-120262
Author(s):  
Damázio Borba Sant’Ana Júnior ◽  
Fábio de Ávila Rodrigues
Keyword(s):  
Economic Analysis ◽  
Computer Program ◽  
Lignocellulosic Biomass ◽  
Annual Cost ◽  
Levulinic Acid ◽  
Economic Feasibility ◽  
Operating Costs ◽  
Total Annual Cost ◽  
Distillation Columns ◽  
Wide Applicability

In this study, the optimization of four processing schemes were developed for the production of 5 hydroxymethylfurfural (HMF), a chemical platform compound obtained from lignocellulosic biomass and used to make the connection with products from fossil resources. Despite its wide applicability, problems associated with its synthesis hindered its greater use. In this scenario the use of a computer program stands out, as the optimization of processes can be used, evaluating the factors and finding parameters that minimize the costs associated with its production. The optimization of these systems was made from the minimization of the total annual cost of the process carried out through the  Aspen Plus® v.11 software, in addition, the economic feasibility of the process was analyzed and it was possible to obtain the HMF at 1.00$ .kg-1 and the co-product levulinic acid between 1.92 and 3.08 $.kg-1. It was also possible to note that among the operating costs, those from glucose had the greatest effect on its value, whereas in relation to equipment costs, reactors and distillation columns were the ones that had the greatest influence.

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%.

Optimization of the Variable Reflux Ratio in a Batch Distillation Column through a Heuristic Method

2007 ◽  
Vol 2 (1) ◽  
Author(s):  
Davide Manca
Keyword(s):  
Distillation Column ◽  
Heuristic Method ◽  
Graphical Analysis ◽  
Computational Effort ◽  
Capacity Factor ◽  
Optimal Time ◽  
Reflux Ratio ◽  
Batch Distillation ◽  
Time Intervals ◽  
Good Trade

The manuscript is focused on the optimization of a batch distillation column that is actually formulated in terms of control problem. The final objective is finding the optimal time-dependent reflux profile. In order to fulfill the call for simplicity and functionality from the industries, the reflux profile was approximated by means of a piece-wise function with three time intervals. A first-principles model, derived from the literature, proved to be a good trade-off between computational effort and accuracy. The capacity factor (CAP), defined as the on-specification products produced per time unit, is the performance index that must be maximized. The optimization problem was solved by a specifically modified Simplex method that demonstrated a good behavior in case of discontinuous objective function. Finally, a graphical analysis of the capacity factor was performed to show the irregularities of such a function.

scholarly journals Modeling Gilliland Correlation using Genetic Programming

2010 ◽  
Vol 5 (5) ◽  
pp. 837 ◽  
Author(s):  
Marius Olteanu ◽  
Nicolae Paraschiv ◽  
Otilia Cangea
Keyword(s):  
Genetic Programming ◽  
Distillation Column ◽  
Petroleum Refining ◽  
Graphical Method ◽  
Analytical Form ◽  
Reflux Ratio ◽  
Programming Technique ◽  
Efficient Operation ◽  
Distillation Columns ◽  
Complex Process

The distillation process is one of the most important processes in industry, especially petroleum refining. Designing a distillation column assesses numerous challenges to the engineer, being a complex process that is approached in various studies. An important component, directly affecting the efficient operation of the column, is the reflux ratio that is correlated with the number of the theoretical stages, a correlation developed and studied by Gililland. The correlation is used in the case of simplified control models of distillation columns and it is a graphical method. However, in many situations, there is the need for an analytical form that adequately approximates the experimental data. There are in the literature different analytical forms which are used taking into account the desired precision. The present article attempts to address this problem by using the technique of Genetic Programming, a branch of Evolutionary Algorithms that belongs to Artificial Intelligence, a recently developed technique that has recorded successful applications especially in process modeling. Using an evolutionary paradigm and by evolving a population of solutions or subprograms composed of carefully chosen functions and operators, the Genetic Programming technique is capable of finding the program or relation that fits best the available data.

scholarly journals Design simulation and economic optimization of a benzene-toluene-xylene system distillation process upon the energy cost

2020 ◽  
Vol 202 ◽  
pp. 10003
Author(s):  
S. Silviana ◽  
Febio Dalanta ◽  
Dewi Qurrota A’yuni ◽  
Lu’luatul Khoiriyah ◽  
Putri Rousan Nabila ◽  
...  
Keyword(s):  
Process Optimization ◽  
Energy Cost ◽  
Annual Cost ◽  
Total Annual Cost ◽  
Reflux Ratio ◽  
Economic Optimization ◽  
Design Variables ◽  
Engineering Strategy ◽  
Benzene Toluene ◽  
System Properties

Distillation is the most extensively used in separation process of the chemical industry. Relationships between non-linear variables, multivariable interactions, dynamic system properties, and other irregularities render the study of design simulation and process optimization an interesting challenge for process engineers. The objective of the process optimization is to produce the most economical to conduct the system. This paper discusses the process engineering strategy started from the determination method of the degree of freedom, design variables, process tools, economic parameters, and the optimization process. The distillation variable optimized in this study was limited to reflux ratio. The optimum variable was construed from the reflux ratio producing the lowest total annual cost (TAC). Furthermore, it was analyzed the energy cost as optimization parameter in the total annual cost (TAC) calculation method to obtain minimum reflux ratio in distillation unit.

Reducing total annual cost and CO2 emissions in batch distillation for separating ternary wide boiling mixtures using vapor recompression heat pump

2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Radhika Gandu ◽  
Akash Kumar Burolia ◽  
Seshagiri Rao Ambati ◽  
Uday Bhaskar Babu Gara
Keyword(s):  
Heat Pump ◽  
Annual Cost ◽  
Cost Effective ◽  
Optimal Number ◽  
Total Annual Cost ◽  
Batch Distillation ◽  
High Compression Ratio ◽  
Multi Stage ◽  
Vapor Recompression ◽  
Energetic Performance

Abstract This paper presents cost-effective heat pump assisted vapor recompression (VRC) design algorithms for the separation of ternary wide boiling mixture in batch distillation in order to reduce total annual cost (TAC) and carbon dioxide (CO2) emissions. A minimum TAC and CO2 is required by the batch distillation process industry for any investments in heat integrated systems, such as VRC. Consequently, the design conditions for implementing VRC should be chosen such that the energetic performance is maximum at minimum TAC. The model system selected in this paper is an application involving high temperature lift, that is, hexanol–octanol–decanol ternary wide boiling mixture. First, a systematic simulation algorithm was developed for conventional multicomponent batch distillation (CMBD) and single-stage vapor recompressed multicomponent batch distillation (SiVRMBD) to determine the optimal number of stages based on the maximum TAC savings. The SiVRMBD saves more energy and TAC than CMBD. However, SiVRMBD has a high compression ratio (CR) throughout the operation, which is not practically feasible for the batch distillation processing. Second, in order to increase the performance and minimize the SiVRMBD weakness, a novel optimal multi-stage vapor recompression algorithm was proposed to operate at the lowest possible CR (<3.5) throughout the batch operation while also conserving the most TAC. Overall, the findings suggest that the proposed optimal multi-stage VRC reduces TAC and CO2 emissions significantly when compared to CMBD. Finally, the influence of the different feed compositions on VRC performance is also studied.

scholarly journals Techno Economic Optimization of Petlyuk Distillation Column Design Using Duelist Algorithm

2017 ◽  
Author(s):  
Totok R. Biyanto
Keyword(s):  
Design Stage ◽  
Total Annual Cost ◽  
Reflux Ratio ◽  
Economic Optimization ◽  
Modified Method ◽  
Distillation Column Design ◽  
Cut Method ◽  
Minimum Number ◽  
The Common ◽  
Column Design

Distillation process consume huge energy so the common method for reducing it is by applying Petlyuk configuration. In design stage, the important thing are the minimum number of stages and minimum reflux ratio. In this paper, four methods of Petlyuk configuration design were compared i.e. the short-cut method, the modified method using Winn equation, Vapor-Liquid Equilibrium (VLE) approach and the proposed method i.e incoorporated optimization algorithm in VLE approach using Duelist Algorithm (DA). Optimization was performed by techno economic consideration. The objective is minimizing the total annual cost for operating period over 10 years. The biggest saving is provide by the optimization using DA wtih VLE calculation, and could saved up to 34,38 %.

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