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Chemical Engineering Science 57 (2002) 715733 www.elsevier.com/locate/ces

Summary: Chemical Engineering Science 57 (2002) 715733
Design and control of an olen metathesis reactive
distillation column
Muhammad A. Al-Arfaj, William L. Luyben
Department of Chemical Engineering, Lehigh University, Iacocca Hall, 111 Research Drive,
Bethlehem, PA 18015-4791, USA
Received 29 May 2001; accepted 19 October 2001
This paper considers the design and control of a reactive distillation column in which one reactant is consumed and two products are
formed (A B+C). The volatilities are B A C , i.e. the reactant is intermediate boiling between the two products. The metathesis
of 2-pentene is considered as the demonstrative example. The column has a single feed of the intermediate boiling reactant. The distillate
contains mostly light component and the bottoms mostly heavy.
Three designs are considered: the base case (low-conversion=low-pressure), a low-conversion=high-pressure case and a high-conversion=
high-pressure case. The base design is obtained from the literature, and the other two steady-state designs are optimized with respect to
the total annual cost. All the designs are found to be openloop stable. Five control structures are studied for the base design. Then the
best two structures are applied to the remaining two designs. This category of reactive distillation exhibits less challenging problems than
other categories since it uses a single feed, which eliminates the need for the control structure to perfectly balance two fresh feeds.
Simulation results demonstrate that e ective dynamic control is provided by a control structure that uses two temperatures to maintain
the purities of both product streams. No internal composition measurement is required. This structure is found to be robust and stable and


Source: Al-Arfaj, Muhammad A. - Department of Chemical Engineering, King Fahd University of Petroleum and Minerals


Collections: Engineering