Premium
Rigorous design and control of thermally integrated pressure‐swing reactive distillation process for isobutyl acetate production considering the effect of column pressures
Author(s) -
Zhang Qingrui,
Liu Yan,
Xu Pengfei,
Wang Yujun
Publication year - 2020
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.23823
Subject(s) - azeotrope , reactive distillation , cascade , process integration , feed forward , chemistry , volatility (finance) , dynamic simulation , process control , relative volatility , distillation , control theory (sociology) , swing , fractionating column , temperature control , process (computing) , process engineering , computer science , mathematics , chromatography , control engineering , engineering , simulation , control (management) , mechanical engineering , artificial intelligence , econometrics , operating system
By studying the effect of pressure on relative volatility, azeotrope composition, and net reaction rate, a rigorous pressure‐swing thermally integrated reactive distillation (PST‐RD) process for isobutyl acetate synthesis is proposed. The steady‐state and dynamic characteristics of the PST‐RD process are evaluated based on Aspen and Aspen Dynamic. Steady‐state optimization results show that the energy consumption and the total annual cost (TAC) reduced by 42.32% and 34.20% compared with the conventional two‐column process, respectively. Subsequently, two control structures of the PST‐RD process under a rigorous model are developed and evaluated by large disturbances in throughput and feed composition. Dynamic simulation results show that peak dynamic transients can be effectively reduced by adding a Q/F feedforward control structure. Furthermore, the effective heat integration of high‐pressure (HP) and low‐pressure (LP) columns can be realized by implementing composition/pressure cascade control when the capacity of the LP column increases.