Design and Control of a Reactive Distillation System with Partial Thermal Coupling
Process intensification is a design philosophy that deliberately integrates different processes into a single operation to reduce energy consumption and capital investment. Reactive distillation and thermally coupled distillation are the successful examples of process intensifications. In the study, the design and control strategies of a reactive distillation system with partial thermal coupling for the production of methanol and n-butyl acetate by transesterification of methyl acetate and n-butanol are investigated. Since methanol and methyl acetate formed an azeotrope, the products of a reactive distillation column include n-butyl acetate and the mixture of methanol and methyl acetate, which must be separated by an additional column. Partial thermal coupling can be used to eliminate the condenser of the second column. Not only energy reduction but also better operability can be obtained for the thermally coupled reactive distillation system. The keys of controlling the system, in which the reaction is kinetically controlled, are (1) to maintain the quality of two products, (2) to maintain the correct stoichiometric balance between the feeds, (3) to account for possible changes in control objective when throughput rate changes. Proper selection and pairing of controlled and manipulated variables chosen for these three objectives were determined by using steady-state analysis. A simple control scheme with three temperature control loops is sufficient to maintain product purities.
Reactive distillation Thermal coupling Design and control Transesterification reaction
San Jang Wang David Shan-Hill Wong
Department of Chemical and Material Engineering,Ta Hwa Institute of Technology,Chiunglin,Hsinchu Department of Chemical Engineering,Tsing Hua University,HsinChu
国际会议
西安
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）