Plant-wide design and control of acetic acid dehydration system via heterogeneous azeotropic distillation and divided wall distillation

Wang, San-Jang; Lee, Chi-Ju; Jang, Shi-Shang; Shieh, Shyan-Shu

doi:10.1016/j.jprocont.2007.05.008

Cited by 44 publications

(47 citation statements)

References 18 publications

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“…Continuous distillations using a low boiling azeotrope entrainer to reach higher purities efficiently are common in industry, so it is likely that a continuous distillation system could purify acetic acid to greater than 99 wt%. Continuous azeotropic distillation is commonly used to recovery acetic acid from aqueous solutions in the terephthalic acid industry [20]. This conclusion was verified by process simulation, demonstrating that these lab-scale inefficiencies and challenges can be overcome by well controlled continuous separation, as is possible in a larger scale system.…”

Section: Acetic Acid Production and Extractionmentioning

confidence: 78%

The Production of Vinyl Acetate Monomer as a Co-Product from the Non-Catalytic Cracking of Soybean Oil

et al. 2015

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Abstract:Valuable chemical by-products can increase the economic viability of renewable transportation fuel facilities while increasing the sustainability of the chemical and associated industries. A study was performed to demonstrate that commercial quality chemical products could be produced using the non-catalytic cracking of crop oils. Using this decomposition technique generates a significant concentration of C2−C10 fatty acids which can be isolated and purified as saleable co-products along with transportation fuels. A process scheme was developed and replicated in the laboratory to demonstrate this capability. Using this scheme, an acetic acid by-product was isolated and purified then reacted with ethylene derived from renewable ethanol to generate a sample of vinyl acetate monomer. This sample was assessed by a major chemical company and found to be of acceptable quality for commercial production of polyvinyl acetate and other products.

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Section: Acetic Acid Production and Extractionmentioning

confidence: 78%

The Production of Vinyl Acetate Monomer as a Co-Product from the Non-Catalytic Cracking of Soybean Oil

et al. 2015

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“…Equilibrium-stage models, using mass, equilibrium, summation of mole fractions, and enthalpy (MESH) equations (Eqs. (1-5)) for each stage are more common in simulators and widely used in azeotropic distillation systems [23,24,27]. Rigorous simulation used in the present study is based on the equilibrium-stage model.…”

Section: Design Methodsmentioning

confidence: 99%

“…2a)) usually includes two columns: an azeotropic column and a recovery column, which has been studied thoroughly by many chemical experts [21][22][23]. However, only a few efforts have been focused on the thermally coupled azeotropic distillation sequence (TCADS) [24]. Based on the CHADS, this paper proposes a thermally coupled azeotropic distillation sequence with a side stripper (TCADS-SS) for purifying isopropanol (see Fig.…”

Section: Introductionmentioning

confidence: 99%

Reducing Energy Consumption and CO₂ Emissions in Thermally Coupled Azeotropic Distillation

et al. 2010

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The design and optimization procedures of a heterogeneous thermally coupled azeotropic distillation sequence with a side stripper (TCADS-SS) for the purification of isopropanol has been investigated. The proposed procedures can detect the optimal values of the design variables and thereby guarantee the minimum energy consumption, which is related to the minimum CO 2 emissions and the lowest total annual cost (TAC). The procedures are applied to the study of the separation of azeotropic mixtures using the two distillation sequences. In the TCADS-SS, the top end of the side stripper has both liquid and vapor exchange with the main column, which eliminates a condenser in contrast with the conventional heterogeneous azeotropic distillation sequence (CHADS). The results show that not only reductions in energy consumption and CO 2 emissions but also higher thermodynamic efficiency can be obtained for the TCADS-SS.

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“…DWC has been also applied to complex distillation systems. Wang extended DWC to azeotropic distillation [12], while other references deal with extractive and reactive DWC [13,14].…”

Section: Control Strategies For Divided-wall Columnsmentioning

confidence: 99%

Control of integrated unit operations

Chinea-Herranz¹,

Rodríguez²

2012

Computer Aided Chemical Engineering

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As a thermal separation method, distillation is one of the most important technologies in the chemical industry. Given its importance, it is no surprise that increasing efforts have been made in reducing its energy inefficiencies. A great deal of research is focused in the design and optimization of the Divided-Wall Column. Its applications are still reduced due to distrust of its controllability. Previous references studied the decentralized control of DWC but still few papers deal about Model Predictive Control. In this work we present a decentralized control of both a DWC column along with its equivalent MPC schema.Keywords: Process Control, Thermally coupled distillation, Model Predictive Control. Main TextBasically, in every production process some of the chemicals go through at least one distillation column on their way from raw species to final product. Distillation is and will remain the main separation method in the chemical industry (there are more than 50,000 columns in operation around the world). Despite its flexibility and widespread use, distillation is very energy demanding. It can generate more than 50% of plant operating costs and it is the responsible of 3% of the energy usage in the U.S. (notice that the thermodynamic efficiency of a distillation column is between 5-20%). In order to reduce this drawback new approaches and configurations have appeared. The divided-wall column (DWC, the name is given because the middle part of the column is split into two sections by a wall) is an important example of process intensification and integration. DWC is very appealing to the chemical industry, with Montz and BASF as the leading companies. Kenig et al. state that there are more than 125 industrial applications nowadays and if the exponential trend continues there will be more than 350 by 2015 [1]. DWC can separate three or more components in one vessel using a single condenser and reboiler, hence reducing capital and operating costs compared to conventional twocolumn sequences. In fact, DWC can save up to 30% in the capital invested and up to 40% in the energy costs, particularly for close boiling species. DWC is considered to be on the path for energy conservation and green house gases emissions decrease. DWC is not widespread due to distrust of its controllability. Its control is more difficult than the control of a conventional schema with two columns for the separation of ternary mixtures because there is more interaction among control loops. Besides, the absence of controllability could mean the absence of the energy savings if the optimal operation is not accomplished. The remaining of the paper is organized as follows. Section two discusses thermally coupled distillation columns, making emphasis in DWC columns. Section three presents the control strategies used in the paper. Section four applies decentralized (PID controllers) control and MPC to a ternary system separation. Finally, section five draws conclusions and introduces further work.

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Plant-wide design and control of acetic acid dehydration system via heterogeneous azeotropic distillation and divided wall distillation

Cited by 44 publications

References 18 publications

The Production of Vinyl Acetate Monomer as a Co-Product from the Non-Catalytic Cracking of Soybean Oil

The Production of Vinyl Acetate Monomer as a Co-Product from the Non-Catalytic Cracking of Soybean Oil

Reducing Energy Consumption and CO₂ Emissions in Thermally Coupled Azeotropic Distillation

Control of integrated unit operations

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Plant-wide design and control of acetic acid dehydration system via heterogeneous azeotropic distillation and divided wall distillation

Cited by 44 publications

References 18 publications

The Production of Vinyl Acetate Monomer as a Co-Product from the Non-Catalytic Cracking of Soybean Oil

The Production of Vinyl Acetate Monomer as a Co-Product from the Non-Catalytic Cracking of Soybean Oil

Reducing Energy Consumption and CO2 Emissions in Thermally Coupled Azeotropic Distillation

Control of integrated unit operations

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Reducing Energy Consumption and CO₂ Emissions in Thermally Coupled Azeotropic Distillation