A novel split-reflux policy in batch reactive distillation for the optimum synthesis of a number of methyl esters

Aqar, Dhia Y.; Rahmanian, Nejat; Mujtaba, Iqbal M.

doi:10.1016/j.seppur.2019.03.071

Cited by 13 publications

(3 citation statements)

References 20 publications

(21 reference statements)

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“…The first phase involves several early studies on RDC for MEG production that provided the initial background on process synthesis, design concept and Advanced Process Control (APC). As example, several papers by García A [12] and Aqar DY et al [13] have proposed preliminary findings on the synthesis and RD design using a Mixed-Integer Nonlinear Programming (MINLP) concept. In addition, Blatkiewicz M et al [14], Cho M et al [15] and Dai SB et al [16] have provided further investigations into RD control system development involving a combined temperature controller and feed-forward compensator approach, nonlinear inversionbased controller and observer-based input/output linearizing Copyright © Jofry Othman PPS.000637.…”

Section: Previous Research and The Novelty Of This Studymentioning

confidence: 99%

Process Modelling and Simulation of Reactive Distillation for the Synthesis of High Purity Mono Ethylene Glycol

Othman

2024

PPS

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This study developed a suitable process modelling technique and simulation model for the non-catalytic synthesis of high purity Mono Ethylene Glycol (MEG) using the Reactive Distillation (RD) process. The feasibility of the RD process is demonstrated for performing the glycol reaction, dewatering and separation indistinguishable from the existing MEG production process with added advantages. Notably, a high purity MEG product of 99.8% is achieved within a single RD column configuration that avoids the need for the make-up of fresh demineralized water as in the current process. A working RD process model is generated that uses the established kinetics model parameters for MEG synthesis in combination with the equilibrium model and thermodynamic parameters in Aspen Plus® software. This included the power-law reaction variables for the main MEG synthesis along with the competing reactions that generate Diethylene Glycol (DEG), Triethylene Glycol (TEG) and Tetra Ethylene Glycol (TTEG) by-products. Hydrodynamics conditions for this process are also produced using a suitably packed column with the counter-current flow configuration of gas and liquid phases. The hydrodynamic variables including packing specification, maximum stage liquid holdup and maximum liquid superficial velocity, are generated to establish a maximum of 47.2% packing capacity and a low-pressure drop of 0.1kPa. Remarkably, compared with the conventional process RD promoted a 3.4% increase in MEG yield and a 53.2% reduction in energy usage. A lower water-to-ethylene oxide feed ratio of 12.9 is found to be suitable against the conventional ratio of 20 which reduces the separation loading while achieving a higher affinity for MEG selectivity of 91.4%. This subsequently generated a low energy usage through the utilization of reaction heat for separation with a net energy release of 0.24MW which lowers the operation cost.

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Section: Previous Research and The Novelty Of This Studymentioning

confidence: 99%

Process Modelling and Simulation of Reactive Distillation for the Synthesis of High Purity Mono Ethylene Glycol

Othman

2024

PPS

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“…SD is 2.32 m 3 , SQ ¼ 20,379 MJ and SED is 8,784 MJ/m 3 . By SBD2, f opt is the same as that of CD (11), R is 13.6. SD is the same as for SBD1, SQ ¼ 15,028 MJ.…”

Section: Influence Of Feed Composition Continuous Distillationmentioning

confidence: 99%

“…Fonseca et al 10 investigated an industrial tributyl citrate production process where butanol is periodically fed to the reboiler. Aqar et al 11 applied a new policy called split-reflux BRD to produce different methyl esters, where a part of the reflux (mostly methanol) was fed into the reboiler instead of feeding fresh methanol.…”

Section: Introductionmentioning

confidence: 99%

Decrease of energy demand of semi-batch distillation policies

Ferchichi

Hégely

Lang

2020

Energy & Environment

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Batch distillation (BD) has much higher energy demand than continuous distillation (CD). Different semi-batch distillation (SBD) policies, by which one part of the feed is continuously fed into a batch column, are investigated and optimised to minimise the energy demand. SBD has the advantage, that contrary to the batch distillation (BD), the liquid volume in the reboiler, can be kept constant, even at its maximal value. Usually, continuous feeding is performed into the reboiler (SBD1), but by shaping a feed plate in the batch column, it has not only a rectifying but also a stripping section. Several SBD policies differing in feeding location are studied by dynamic simulation and compared based on the specific energy demand (SED) of production. The different policies and effects of the variation of feed composition are studied for the separation of the mixture dichloromethane-acetone. The lowest SED is obtained by SBD with feeding at a variable location of the column (SBD3). However, feeding at a fixed location (SBD2) is much simpler to realise and only slightly inferior. Further reduction of SED is reached by using two SBD2 or one SBD2 and one BD step with different reflux ratios. The separation of the mixture n-hexane-n-heptane-n-octane is also studied by SBD1 and SBD2 policies with both direct and indirect sequences. The energy demand of SBD2 in indirect sequence is lower than that of the direct sequence by 25%. By applying SBD2, SED was reduced by 38% and 39% for binary and ternary mixtures, respectively, compared to BD.

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Mixed-Integer dynamic optimization of conventional and vapor recompressed batch distillation for economic and environmental objectives

Parhi

Rangaiah

Jana

2020

Chemical Engineering Research and Design

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A novel split-reflux policy in batch reactive distillation for the optimum synthesis of a number of methyl esters

Abstract: Citation Aqar DY, Rahmanian N and Mujtaba IM (2019) A novel split-reflux policy in batch reactive distillation for the optimum synthesis of a number of methyl esters. Separation and Purification Technology.

Cited by 13 publications

References 20 publications

Process Modelling and Simulation of Reactive Distillation for the Synthesis of High Purity Mono Ethylene Glycol

Process Modelling and Simulation of Reactive Distillation for the Synthesis of High Purity Mono Ethylene Glycol

Decrease of energy demand of semi-batch distillation policies

Mixed-Integer dynamic optimization of conventional and vapor recompressed batch distillation for economic and environmental objectives

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