(53ab) Simultaneous Design and Control of an Inherently Safer Extractive Distillation Column

Abstract for 2018 AIChE Spring Meeting and 14th Global
Congress on Process Safety April 22-25, 2019 Orlando, FL
Session Selection:  Process Safety
Spotlights(T1F)
T1F00 Inherently
Safer Design - Oral Session
Simultaneous Design and Control of an Inherently
Safer Extractive Distillation Column
Denis
Su-Feher^1,2, Bin Zhang^1,2, Yogesh Koirala^1,2,
Efstratios Pistikopoulos^2,3, and M. Sam Mannan^1,2
Mary
Kay O’Connor Process Safety Center¹
Artie
McFerrin Department of Chemical Engineering²
Texas
A&M Energy Institute³
Texas
A&M University
College
Station, Texas 77843-3122, USA
+1(408)838-8716,
denis@tamu.edu

Abstract: Current inherently safer design
strategies in the early stage of design focus on reducing the overall hazard of
a process without considering its operability. The process is first designed to
be inherently safer with respect to a nominal, steady state case and then,
after the process is designed, layers of protection are added and operability
issues are addressed. However, the way a process is designed heavily impacts
its operability. An intensified process may contain less of a hazardous
substance and thus be inherently safer, but if the design restricts the
controllability of the process, then the design may pose a higher risk and the
process will be less safe overall. Therefore, in the early stage of design, it
is necessary to consider of both the inherent hazard contained within the
process and the ease by which these hazards can be controlled. With the dynamic behaviour of process systems
becoming increasingly complex, the consideration of operability issues in the
design stage becomes even more necessary to prevent incidents. Hence, a considerable amount of research has been
done to simultaneously optimize the design and control system of extractive distillation
columns, but no such approach has integrated inherent safety, only seeking to
produce an economically optimal design rather than a safe one CITATION Vas03 \l 1033  [1].
The objective of this research is to implement a strategy to
simultaneously design and control an inherently safer extractive distillation
column. The PARametric Optimization and Control (PAROC) framework is used as a
basis for the simultaneous design and control of an extractive distillation
column^{CITATION Pro17 \l 1033}  [2].  An
extensive literature review has identified inherent safety indices that can
compare the hazard level of different column designs CITATION FIK01 \l 1033  \m Fai04 \m Nan14 [3, 4, 5]. The inherent safety
index is incorporated into the PAROC framework, and the extractive distillation
column is simultaneously optimized for optimal control, design, and safety. The
integration of inherently safer design and control substantially reduces
operability issues that result from an uncontrollable process design and allows
for greater tolerance and ease of control.
Keywords

Safe Design, Design/Green Engineering, Distillation,
Multi-parametric Programing

References

 BIBLIOGRAPHY

[1]	V. Sakizlis, “Design of Model Based Controllers via Parametric Programming,” Department of Chemical Engineering and Chemical Technology, Imperial College, London, London, 2003.
[2]	N. A. Diangelakis, B. Burnak, J. Katz and a. E. N. Pistikopoulos, “Process design and control optimization: A simultaneous approach by multi-parametric programming,” AIChE Journal, vol. 00, no. 00, p. 20, 2017.
[3]	T. H. F. I. Khan and S. A. Abbasi, “SAFETY WEIGHTED HAZARD INDEX (SWeHI) A New, User-friendly Tool for Swift yet Comprehensive Hazard Identi®cation and Safety Evaluation in Chemical Process Industries,” Trans IChemE, vol. 79, pp. 65-80, 2001.
[4]	F. I. Khan and P. R. Amyotte, “Integrated Inherent Safety Index (I2SI): A Tool for Inherent Safety Evaluation,” Process Safety Process, vol. 23, no. 2, pp. 136-148, 2004.
[5]	N. Medina-Herrera, I. E. Grossmann, M. S. Mannan and A. Jimenez-Gutierrez, “An Approach for Solvent Selection in Extractive Distillation Systems Including Safety Considerations,” Ind. Eng. Chem. Res., vol. 53, p. 12023−12031, 2014.