Design and control of extractive distillation process for separation of the minimum-boiling azeotrope ethyl-acetate and ethanol

Zhang, Qingjun; Liu, Meiling; Li, Chenxiaodong; Zeng, Aiwu

doi:10.1016/j.cherd.2018.04.043

Cited by 60 publications

(12 citation statements)

References 36 publications

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“…The composition of the feed was the input data: the chemical composition of the organic layer obtained at the end of the esterification process using 5 %mol catalyst was used. The purification process was designed by considering a first distillation of the reacted mixture with the aim of separating EA from the residual AA (DC1), followed by an extractive distillation of the distillate using dimethyl sulfoxide (DMSO) (Zhang et al, 2018) which consisted in two further columns (namely EC and DC2). The total number of plates, the feeding plate, the distillate flow and the reflux ratio were the independent variables (factors) for all the columns and were iteratively varied to obtain the best combination that satisfied the specific separation criteria defined for each column and had the minimum energy.…”

Section: Purification Of Ea: Process Modelling and The Optimisation Methodsmentioning

confidence: 99%

“…The distillate from DC1 appeared to be like an azeotropic EtOH:EA mixture, from which the purification of EA could be efficiently accomplished by extractive distillation (EC in Fig. 9) using DMSO (Zhang et al, 2018). Thus, pure EA can be distilled by EC, and the ethanol can be purely and quantitatively recovered through a third distillation (DC2).…”

Section: Advantages Related To the Use Of Alcl 3 •6h 2 O Instead Of H 2 So 4 As The Catalyst In Producing Eamentioning

confidence: 99%

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Process intensification for the production of the ethyl esters of volatile fatty acids using aluminium chloride hexahydrate as a catalyst

Bitonto

Menegatti

Pastore

2019

Journal of Cleaner Production

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A new process for obtaining the ethyl esters of volatile fatty acids with ethanol by using aluminium chloride hexahydrate as a catalyst is proposed. Aluminium chloride not only exhibits good activity, composition equilibrium is achieved within 3e4 h at 343 K, but also induces a phase separation with a convenient distribution of the components. In fact, more than 99 %wt of the ethyl esters, together with most of the unreacted acid and ethanol, were found in the upper layer, which was well separated from the bottom phase, which contained the co-formed water and over 97.8 %wt of the catalyst. The intensification of this reaction and separation was thoroughly investigated and the operational conditions optimised. The effects of this separation on the purification of the final ethyl esters is fully investigated. A new configuration of unit operations is designed for the specific production of ethyl acetate, simulated through Aspen Plus V9® and compared with the current industrial process based on sulfuric acid catalysis. The overall production and purification of ethyl acetate is economically competitive, reduces the energy requirements by more than 50%, and is potentially a zero-waste process, resulting in cleaner production.

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Section: Purification Of Ea: Process Modelling and The Optimisation Methodsmentioning

confidence: 99%

Section: Advantages Related To the Use Of Alcl 3 •6h 2 O Instead Of H 2 So 4 As The Catalyst In Producing Eamentioning

confidence: 99%

Process intensification for the production of the ethyl esters of volatile fatty acids using aluminium chloride hexahydrate as a catalyst

Bitonto

Menegatti

Pastore

2019

Journal of Cleaner Production

View full text Add to dashboard Cite

show abstract

“…The results of the study showed that the ERGA control strategy can effectively maintain the stability of the distillation process and the purity of the product. Zhang et al 24 used a new control scheme of bypassing a portion of hot stream around an economizer with double-point temperature control strategy to separate minimum-boiling azeotrope EAC and ethanol. This control structure could achieve robust control performance after adding disturbances.…”

Section: Introductionmentioning

confidence: 99%

Dynamic control of heat pump assisted extractive distillation process for separation of ethyl acetate/isopropanol/water mixture

Shan

Niu

Meng

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: Controlling the behavior of processes for the recovery of ethyl acetate and isopropanol from industrial wastewater is a hot topic. In this work, dynamic control structures of the extractive distillation process and heat pump combined with feeding preheating extractive distillation process are researched. The control performance of the proposed control structures is tested by adding feed flow and composition disturbance. In these two processes, two-point temperature control structure is first used. RESULTS:The results show that this structure can maintain product purity within a reasonable range under disturbance. Furthermore, the composition controller is used to improve control performance.CONCLUSION: The improved structure can effectively meet the requirements of product purity. The heat pump combined with feeding preheating extractive distillation process can use the same control structure as the extraction process and show good controllability. This study has a certain guiding value for the research of chemical dynamic control.

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“…Extractive distillation (ED) has been widely applied to separate azeotropes, such as isopropanol dehydration, tert ‐butanol dehydration, propylene glycol methyl ether dehydration, ethyl acetate/ethanol separation, 2‐methoxyethanol/toluene separation and methylal/methanol separation . The azeotropic feed in plants usually contains impurities.…”

Section: Introductionmentioning

confidence: 99%

Control of extractive distillation processes with intermediate impurities removed as a side withdrawal from the extractive distillation column

Jiang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND The design and control of extractive distillation (ED) for separating azeotropes has been widely investigated. However, most researches only deal with simple binary azeotropes without considering impurities. In fact, in industrial practices, intermediate impurities can be removed as a side withdrawal from the extractive distillation column. The dynamic control of such processes has not been investigated. Furthermore, there are many heat‐integrated alternatives of basic ED sequence. When considering impurities withdrawn, the dynamic control of these alternatives may face some difficulties. Thus, this article aims to establish the effective control structures of ED processes for separating azeotropes with intermediate impurities, including basic sequence and heat‐integrated alternatives. Ethanol dehydration is selected to be explored, including a basic sequence (BS), a heat‐integrated sequence (HIS) which combines the pre‐concentration column and the entrainer recovery column into one column and the thermodynamic equivalent sequence of the HIS (TEHIS). Overall assessment of the dynamic performances of these sequences is implemented. RESULTS For all the sequences, the dynamic performance with entrainer recycling stream being proportional to the extractive distillation column (EDC) feed is better than being proportional to the fresh feed. Meanwhile, large negative transient deviations in the water product purity and intensive fluctuations of sensitive‐stage temperatures can be observed for the HIS, but not for the TEHIS. CONCLUSIONS The TEHIS is the best sequence considering both economics and dynamics. These sequences and the analyses of their dynamic controllability are valuable in practice for multicompoent azeotropes purification. © 2020 Society of Chemical Industry

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Design and control of extractive distillation process for separation of the minimum-boiling azeotrope ethyl-acetate and ethanol

Cited by 60 publications

References 36 publications

Process intensification for the production of the ethyl esters of volatile fatty acids using aluminium chloride hexahydrate as a catalyst

Process intensification for the production of the ethyl esters of volatile fatty acids using aluminium chloride hexahydrate as a catalyst

Dynamic control of heat pump assisted extractive distillation process for separation of ethyl acetate/isopropanol/water mixture

Control of extractive distillation processes with intermediate impurities removed as a side withdrawal from the extractive distillation column

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