This
paper considers the design and control of the separation of benzene
and cyclohexane process via extractive distillation in a dividing
wall column. To aid the separation, furfural is used as the heavy
boiling entrainer. The optimal flow sheet with minimum energy requirements
has been established using the multiobjective genetic algorithm with
constrains. Three control strategies are proposed: the basic control
strategy uses four composition controllers, and two improved control
strategies with and without vapor split ratio use temperature controllers
that are more practical in application than the basic control strategy.
The dynamic simulations reveal that the three control strategies can
object to the feed disturbances well. The dynamic responses of two
improved control structures show that vapor split ratio as a manipulated
variable can maintain the product purities at their set points when
a feed disturbance is introduced.
As an emerging green and sustainable
solvent, a deep eutectic solvent
(DES) applied to the carbon capture process is considered to be a
promising absorbent. This work aims to comprehensively evaluate the
potential and effectiveness of DESs for CO2 capture. First,
a hydrophobic DES, which is composed of tetrabutylammonium bromide
as the hydrogen bond acceptor (HBA) and decanoic acid as the hydrogen
bond donor (HBD) with a molar ratio of 1:2, was screened out from
280 DESs by the conductor-like screening models–segment activity
coefficient (COSMO-SAC) model. Then, quantum chemistry methods were
used to investigate the interaction mechanism between the DES and
CO2. The results show that the interactions between CO2 and the DES are mainly weak hydrogen bonds and van der Waals
dispersion attraction forces. Next, gas–liquid equilibrium
experiments were performed to investigate the effects of temperature
and pressure, the types of HBAs and HBDs, and the molar ratios of
HBA to HBD on the solubility of CO2. The results show that
the process of DES absorbing CO2 obeys Henry’s law
and confirm the reliability of the COSMO-SAC model prediction. Finally,
a rigorous rate-based model for the DES-based postcombustion CO2 capture process was simulated, and the life cycle environmental
sustainability was evaluated and compared with that of the traditional
solvent monoethanolamine, confirming the advantages of the negligible
vapor pressure, thermal stability, and low ecological toxicity of
the DES. This study provides a technical reference for applying new
solvents developed in the laboratory to practical industrial processes.
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