Heat-Integrated Distillation Columns as a Retrofit Cannot Bring Energy Savings to the Ethylene Plant

2021 ◽  
Author(s):  
Panagiotis Kagioulis ◽  
Rajaram Ramesh ◽  
Marco van Goethem ◽  
Marija Saric ◽  
Yvonne C. van Delft
Keyword(s):  
Energy Savings ◽  
Distillation Columns ◽  
Ethylene Plant

scholarly journals Innovation in Continuous Rectification for Tequila Production

Processes ◽  
2019 ◽  
Vol 7 (5) ◽  
pp. 283
Author(s):  
Estarrón-Espinosa Mirna ◽  
Ruperto-Pérez Mariela ◽  
Padilla-de la Rosa José Daniel ◽  
Prado-Ramírez Rogelio
Keyword(s):  
Energy Savings ◽  
Distillation Process ◽  
Distillation Columns ◽  
Continuous Rectification ◽  
New Process ◽  
Volatile Profiles ◽  
First Time ◽  
Continuous Distillation ◽  
Manual Mode ◽  
Rectification Process

In this study, a new process of continuous horizontal distillation at a pilot level is presented. It was applied for the first time to the rectification of an ordinario fraction obtained industrially. Continuous horizontal distillation is a new process whose design combines the benefits of both distillation columns, in terms of productivity and energy savings (50%), and distillation stills in batch, in terms of the aromatic complexity of the distillate obtained. The horizontal process of continuous distillation was carried out at the pilot level in a manual mode, obtaining five accumulated fractions of distillate that were characterized by gas chromatography (GC-FID). The tequila obtained from the rectification process in this new continuous horizontal distillation process complies with the content of methanol and higher alcohols regulated by the Official Mexican Standard (NOM-006-SCFI-2012). Continuous horizontal distillation of tequila has potential energy savings of 50% compared to the traditional process, besides allowing products with major volatile profiles within the maximum limits established by the regulation for this beverage to be obtained.

Energy savings in heat-integrated distillation columns

Energy ◽  
1997 ◽  
Vol 22 (6) ◽  
pp. 621-625 ◽  
Author(s):  
M Nakaiwa
Keyword(s):  
Energy Savings ◽  
Distillation Columns

scholarly journals Divided Wall Column Modeling and Simulation in an Open-Source Environment

2020 ◽  
Vol 34 (3) ◽  
pp. 149-167
Author(s):  
João Paulo Henrique ◽  
Ruy de Sousa Jr. ◽  
Argimiro Resende Secchi ◽  
Mauro Antonio da Silva Sá Ravagnani ◽  
Abdessamad Barbara ◽  
...  
Keyword(s):  
Modeling And Simulation ◽  
Open Source ◽  
Chemical Process ◽  
Energy Savings ◽  
Vapor Flow ◽  
Flow Rates ◽  
Distillation Columns ◽  
Simulation And Optimization ◽  
Modeling Simulation ◽  
Divided Wall Column

The divided wall column (DWC) can achieve sharp separations of three or more components in a single shell, substituting conventional sequences of two or more binary<br /> distillation columns, with lower expenses. Despite these advantages, DWC models are not available in commercial chemical process simulators. To simulate DWC, users must employ instances of conventional column model and couple them in different configurations. In this paper, a DWC model was developed in EMSO (Environment for Modeling, Simulation and Optimization). DWC model was then used for simulating the separation of an equimolar mixture of three hydrocarbons. Results show that, depending on the number of trays, DWC presented energy savings compared to two ordinary distillation columns. Better separation was obtained when the number of divided trays was close to half the number of total trays. However, the liquid and vapor flow rates split into the divided section play a key role in the separation.

ENERGY EFFICIENT DISTILLATION COLUMNS ANALYSIS FOR AN AROMATIC SEPARATION PROCESS

2016 ◽  
Vol 78 (3-2) ◽  
Author(s):  
Muhammad Zakwan Zaine ◽  
Mohd. Faris Mustafa ◽  
Onn Hassan ◽  
Kamarul Asri Ibrahim ◽  
Norazana Ibrahim ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Energy Efficient ◽  
Driving Force ◽  
Energy Savings ◽  
Energy Analysis ◽  
Optimal Sequence ◽  
Separation Unit ◽  
Distillation Columns ◽  
Improve Energy Efficiency ◽  
Force Method

Energy savings is a major challenge in distillation operations. However, there is still one problem, which is how do we improve the energy efficiency of the existing distillation column systems without major modifications. Recently, a new energy efficient distillation columns methodology that will be able to improve energy efficiency of the existing separation systems without having major modifications has been developed. Therefore, the objective of this paper is to present a new improvement of the existing methodology by designing an optimal sequence of energy efficient distillation columns using a driving force method. Accordingly, the methodology is divided into four hierarchical sequential stages: i) existing sequence energy analysis, ii) optimal sequence determination, iii) optimal sequence energy analysis, and iv) energy comparison and economic analysis. The capability of this methodology is tested in designing an optimal synthesis of energy efficient distillation columns sequence of an aromatics separation unit. The existing aromatics separation unit consists of six compounds (Methylcyclopentane (MCP), Benzene, Methylcyclohexane (MCH), Toluene, m-Xylene and o-Xylene) with five direct sequence distillation columns being simulated using a simple and reliable short-cut method and rigorously tested within an Aspen HYSYS® simulation environment. The energy and economic analyses show that the optimal sequence determined by the driving force method has a better energy reduction with a total of 6.78% energy savings and a return of investment of 3.10 with a payback period of 4 months. It can be concluded that, the sequence determined by the driving force method is not only capable in reducing energy consumption, but also has a better economic cost for an aromatic separation unit

scholarly journals Dynamic Behaviour of Thermally Coupled Distillation Arrangements: Effect of the Interconnection Flowrate

2008 ◽  
Vol 3 (1) ◽  
Author(s):  
Erick Yair Miranda-Galindo ◽  
Juan Gabriel Segovia - Hernández
Keyword(s):  
Energy Consumption ◽  
Energy Savings ◽  
Complex Structure ◽  
Minimum Energy ◽  
Control Analysis ◽  
Thermally Coupled Distillation ◽  
Distillation Columns ◽  
Minimum Energy Consumption ◽  
Coupled Structures ◽  
Value Decomposition

Thermally coupled distillation sequences can provide significant energy savings with respect to the operation of conventional distillation columns. Coupled sequences exhibit a complex structure, with recycle streams, that appear to affect their controllability properties. One potential solution to this problem has been suggested through the operation of complex schemes under conditions that do not provide minimum energy consumption. The basic idea is that if one changes the value of the interconnection flowrate, the control properties might change as well. In this work, we analyze the dynamic behavior of two coupled structures under different operating points, including the one with minimum energy consumption. The control analysis properties are analyzed with the application of the singular value decomposition technique in all frequency domains. The results show that the controllability properties of distillation sequences may change significantly depending on the selected value of interconnection flowrate.

Ethylene (plant physiology)

AccessScience ◽  
2015 ◽  
Keyword(s):  
Plant Physiology ◽  
Ethylene Plant

Ethylene Plant Scheduling System Based on a MINLP Formulation

1997 ◽  
Vol 21 (1-2) ◽  
pp. S1073-S1077 ◽  
Author(s):  
I Tjoa
Keyword(s):  
Scheduling System ◽  
Ethylene Plant

Copenhagen Agreement - A New Paradigm of Climate Problem Solving

2010 ◽  
pp. 115-132 ◽  
Author(s):  
S. Agibalov ◽  
A. Kokorin
Keyword(s):  
Climate Change ◽  
Energy Savings ◽  
Global Climate ◽  
Climate Change Policy ◽  
New Order ◽  
Paradigm Shifts ◽  
New Paradigm ◽  
Energy Efficiency Policy ◽  
Policy Paradigm ◽  
Change Policy

Copenhagen summit results could be called a failure. This is the failure of UN climate change policy management, but definitely the first step to a new order as well. The article reviews main characteristics of climate policy paradigm shifts. Russian interests in climate change policy and main threats are analyzed. Successful development and implementation of energy savings and energy efficiency policy are necessary and would sufficiently help solving the global climate change problem.

Pilot trials of hemicelluloses extraction prior to thermomechanical pulp production: Part 1

TAPPI Journal ◽  
2011 ◽  
Vol 10 (5) ◽  
pp. 21-28 ◽  
Author(s):  
CARL HOUTMAN ◽  
ERIC HORN
Keyword(s):  
Oxalic Acid ◽  
Energy Savings ◽  
Wood Chip ◽  
Strength Properties ◽  
Thermomechanical Pulp ◽  
Sugar Solution ◽  
Bisulfite Treatment ◽  
Pilot Trials ◽  
Pulp Production ◽  
Production Part

Pilot data indicate that wood chip pretreatment with oxalic acid reduced the specific energy required to make thermomechanical pulp. A combined oxalic acid/bisulfite treatment resulted in 21% refiner energy savings and 13% increase in brightness for aspen. A low level of oxalic acid treatment was effective for spruce. Energy savings of 30% was observed with no significant change in strength properties. Adding bisulfite did not significantly increase the brightness of the spruce pulp. For pine, the optimum treatment was a moderate level of oxalic acid, which resulted in 34% energy savings and an increase in strength properties. For all of these treatments 1–3 w/w % carbohydrates were recovered, which can be fermented to produce ethanol. The extract sugar solution contained significant quantities of arabinose.

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