Comparative Analysis of Separation Schemes of Reaction Mixtures of Epichlorohydrin Production in the Presence of Various Solvents

Okhlopkova, E. A.; Фролкова, А. К.

doi:10.1134/s0040579519060101

Cited by 5 publications

(13 citation statements)

References 3 publications

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“…The flowsheet of the chlorohydrin process was developed based on the available patents 6‐20 . Figure 3 shows the flowsheet of this process for ECH manufacturing.…”

Section: Resultsmentioning

confidence: 99%

“…However, it is unclear what the best solvent entails, as some papers suggested that methanol should not be used as solvent due to difficulties in the separation section for this case. 15 The choice of solvent for this process is important, because it has a major influence both on the reaction and separation section of the process. Danov et al 13 identified alcohols and ketones as potential solvents for homogenizing the HP/ACH mixture, yet the reactivity of ketones with HP, forming hazardous organic peroxides, excludes them as safe choices.…”

Section: Oxidation Routementioning

confidence: 99%

“…It was also suggested that isopropanol could be used instead since the separation sequence for methanol is unfeasible (as the reactor effluent contains components that form azeotropes, such as ACH/MeOH, ECH/water and ACH/water). 15 This claim is incorrect in the process context, and this study clearly proves that with proper constraints the separation sequence (using methanol as solvent) is actually possible, and this is further compared to the work by Wang et al 22 The previously proposed separation schemes 35 focused on the separation of every component in the mixture, which poses difficulties due to the fact that multiple azeotropes need to be broken by using a solvent, and this makes the separation sequence difficult and very energy demanding. However, these difficulties can be overcome by developing the separation system in such a way that only the necessary splits are performed.…”

Section: Enhanced Oxidation Processmentioning

confidence: 99%

“…Novel ways of manufacturing ECH have been proposed, but no clear data are available regarding possible improvements of a new process. Moreover, for the ECH process based on the oxidation route, it is known that using methanol as solvent provides the best yield, but the separation sequence for this path has been considered unviable due to the many separation steps involved and significant energy use 15 . Despite some research on the control and safety aspects of the process, 22 a direct comparison between the full novel oxidation route and chlorohydrin process has not yet been made.…”

Section: Problem Statementmentioning

confidence: 99%

“…From the kinetic perspective, methanol is the most suitable solvent, as it does not react with hydrogen peroxide (HP) and provides the highest yields of reaction. However, it is unclear what the best solvent entails, as some papers suggested that methanol should not be used as solvent due to difficulties in the separation section for this case 15 . The choice of solvent for this process is important, because it has a major influence both on the reaction and separation section of the process.…”

Section: Introductionmentioning

confidence: 99%

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Eco‐efficiency improvements in the propylene‐to‐epichlorohydrin process

Madej

Kiss

2023

J of Chemical Tech & Biotech

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BACKGROUND Epichlorohydrin (ECH) production is an important industrial process, owing to its importance in windmill blade manufacture, but it suffers from several drawbacks such as high energy use, large wastewater production and low atom efficiency. This original study investigates a novel chlorohydrin‐free technology with an enhanced separation system for ECH production. Rigorous process simulations were performed in Aspen Plus for the classic and novel processes, and a fair techno‐economic and sustainability comparison was made between the new catalytic oxidation route and the classic chlorohydrin process. RESULTS For the hydrogen peroxide (HP) process route, a novel separation system was developed using methanol as solvent, which enables high purity of ECH. Moreover, allyl chloride (ACH) purification was optimized using thermally coupled distillation to improve the energy efficiency of ACH production. The novel HP process provides 88% higher atom efficiency, about 10% higher yield and a smaller amount of by‐products, as well as a 13% increase in production capacity and major savings of 98% in wastewater production, while also achieving lower energy use (<40 MJ kg−1 ECH) and reduced carbon dioxide emission (1.13 kg kg−1 ECH). CONCLUSION The developed HP process route is feasible and economically viable. Also, it can be partly retrofitted to existing ECH plants based on the chlorohydrin route. As both processes use the same intermediate product, only the ECH part of a classic process would be replaced by the novel route, while keeping the common ACH part. This approach is the most profitable, as only 55% of capital expenditure is required for this modification, while the plant would benefit from all the improvements provided by the novel process. © 2023 The Authors. Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).

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“…The flowsheet of the chlorohydrin process was developed based on the available patents 6‐20 . Figure 3 shows the flowsheet of this process for ECH manufacturing.…”

Section: Resultsmentioning

confidence: 99%

Section: Oxidation Routementioning

confidence: 99%

Section: Enhanced Oxidation Processmentioning

confidence: 99%

Section: Problem Statementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Eco‐efficiency improvements in the propylene‐to‐epichlorohydrin process

Madej

Kiss

2023

J of Chemical Tech & Biotech

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Evaluation and control of energy‐efficient processes for separating epichlorohydrin‐oriented quaternary system

Qi,

Yang,

Zhang

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDThe direct epoxidation of allyl chloride is a clean and efficient synthesis method for producing Epichlorohydrin (ECH), which is a crucial organic intermediate widely used in the fields of renewable energy and aerospace. However, the presence of multiple azeotropes in the synthesized product using this method complicates the separation process and results in high energy consumption. To efficiently separate high‐purity ECH, this paper investigates and analyzes three separation schemes based on the phase‐equilibrium analysis, including hybrid extractive distillation (HED), pressure swing distillation (PSD), and three‐column batch distillation (TCBD).RESULTSThe operating parameters of the three separation processes are optimized by the sequential iterative optimization method that the minimum total annual cost (TAC) can reach 493 491 $/y. The thermal integration method is used for process energy‐saving optimization, and the TAC can be further reduced by 6.9%. In addition, a comprehensive evaluation based on economic, energy, environmental, and exergy analysis is conducted, and reveals that TCBD process with thermal integration is optimal. A control structure is designed for the TCBD process to enhance its robustness that the purity of ECH remains above 99.9 mol% under ±10% disturbances in feed flowrate and composition.CONCLUSIONSCompared with HED and PSD processes, the TCBD process has better economic and environmental benefits, and its control structure can effectively resist disturbances. It is reasonable to believe that the TCBD process can be an excellent solution for the industrial production of ECH.This article is protected by copyright. All rights reserved.

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