Influence of Reaction System Properties on the Energy Saving Potential of the Reactive Dividing‐Wall Column: Separation Properties

Self Cite

The reactive dividing-wall column (RDWC) presents a highly integrated process that enables significant reductions in investment costs and energy consumption. However, the high degree of integration of this apparatus causes numerous interactions between kinetics, vapor-liquid equilibrium, and mass transfer. To ensure a reliable operation of the RDWC, suitable control schemes need to be developed and experimentally validated. A decentralized control scheme for the RDWC is presented and for the first time experimentally investigated on an RDWC pilot plant. A comparison of experimental and simulated data is carried out and shows good agreement.The transesterification of n-butyl acetate with 1-hexanol (Eq. (1)), catalyzed by the immobilized enzyme Novozym 435, is selected as reference system. A detailed investigation of the

Section: Methodsmentioning

confidence: 99%

“…A comprehensive review of these works is presented by Weinfeld et al [5]. Several experimentally validated steady-state models are available [8][9][10] and methods for an efficient column design have been developed [11,12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Decentralized Process Control for Reactive Dividing‐Wall Columns

Egger

Fieg

2020

Self Cite

“…Kiss gave an extensive review about the production of biofuels such as bioethanol and biodiesel using the RDWC which is also well‐known for reducing energy requirement and costs as compared to the reactive distillation (RD) unit , . Most of the work reported in literature emphasizes the comparative assessment of the RDWC with conventional process alternatives to establish the merits of this technology . The design of an RDWC was reported by a few researchers , .…”

Section: Introductionmentioning

confidence: 99%

Optimization of Reactive Dividing‐Wall Distillation Column for Ethyl t‐Butyl Ether Synthesis

Kaur

Sangal

2018

Ethyl t‐butyl ether (ETBE) was synthesized via reaction of ethanol and isobutene by means of a reactive dividing‐wall distillation column (RDWC). The RDWC was simulated using the RADFRAC model of Aspen Plus. Multi‐response optimization by response surface methodology (RSM) with desirability function approach was applied for maximizing product purities and minimizing energy requirements and CO2 emissions simultaneously with a constraint that the difference in pressure drop across the dividing wall should be zero. The prediction from the RSM optimization agrees well with the simulation. The optimized RDWC provided an excellent purity of 99.99 mol % of the product ETBE with about one‐third reduction in energy requirements and CO2 emissions as compared to reactive distillation.

“…They believed that the advantage of this new integrated design was the ability to overcome vapor‐liquid equilibrium (VLE) and chemical equilibrium limitations. Fieg and Schröder determined the influence of the separation performance of the reaction system on the energy‐saving potential systematically. In 2009, Hernandez et al studied steady and dynamic simulations of the RDWC for the esterification of EtOH and acetate to form EA.…”

Section: Introductionmentioning

confidence: 99%

Coproduction of Ethyl Acetate and n‐Butyl Acetate by Using a Reactive Dividing‐Wall Column

Xie

Peng

et al. 2018

The performance of the reactive distillation dividing-wall column for coproduction of ethyl acetate and butyl acetate was experimentally studied. n-Butanol and ethanol are raw reaction materials that react with acetic acid in the reaction zone to produce n-butyl acetate and ethyl acetate, respectively. n-Butyl acetate is not only a product, but also acts to remove water generated by the esterification reactions. The effects of various parameters, such as catalyst loading per stage, reflux ratio, liquid split and molar feed ratios, ethyl acetate/n-butyl acetate purity, pressure drop, and total energy consumption, are investigated. Results show that ethanol could be completely converted and the products could be easily separated, which shows great industrial application potential in the coproduction of ethyl acetate and n-butyl acetate.