Process synthesis and plantwide control of intensified extractive distillation with preconcentration for separating the minimum-boiling azeotropes: A case study of acetonitrile dehydration

•An improved systematic process synthesis method for ED with preconcentration.•Investigation of dynamics and control of potentially beneficial ED processes.•New robust control structures are developed based on temperature measurements.•Decoupling temperature loops to improve dynamic control performa...

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Bibliographic Details
Published in:Separation and purification technology Vol. 285; p. 120397
Main Authors: Cui, Chengtian, Zhang, Qingjun, Zhang, Xiaodong, Sun, Jinsheng, Chien, I-Lung
Format: Journal Article
Language:English
Published: Elsevier B.V 15.03.2022
Subjects:
Acetonitrile dehydration
Dynamic controllability
Extractive distillation
Process intensification
Process synthesis
PSD
HI
EG
Extractive distillation
EDC
SRC
VRC
HP
E-DWC
HAD
Process intensification
ACN
IAE
LSS
PDC
TC
Acetonitrile dehydration
Dynamic controllability
DWC
Process synthesis
TAC
PI
FEHE
ED
ISSN:1383-5866, 1873-3794
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Summary:•An improved systematic process synthesis method for ED with preconcentration.•Investigation of dynamics and control of potentially beneficial ED processes.•New robust control structures are developed based on temperature measurements.•Decoupling temperature loops to improve dynamic control performances.•Good quality control tackling throughput and composition disturbances up to 20 %. An investigation of the process synthesis and plantwide control of energy saving extractive distillation with preconcentration to produce anhydrous acetonitrile with ethylene glycol as a heavy entrainer is reported. In the process synthesis, process intensification introduces stripping column modification, heat integration, thermal coupling, vapor recompression, liquid side stream, and dividing wall column. These measures achieve significant reductions in energy costs of more than 30 % and the total annual cost of approximately 20 % as compared to the base case. The subsequent proposal of robust plantwide control structures brings about stable regulatory control when large ± 20% disturbances of throughput and composition are introduced. These control structures feature several decentralized proportional-integral temperature controller loops without composition measurements. The dynamic responses indicate that the control properties of complex arrangements can be comparable to those of a regular sequence, however, the intensified arrangements have the potential to offer significant energy savings.
ISSN:1383-5866
1873-3794
DOI:10.1016/j.seppur.2021.120397