Multiple transesterifications in a reactive dividing wall column integrated with a heat pump

Lee, Heecheon; Jang, Wonjoon; Lee, Jae Woo

doi:10.1007/s11814-019-0271-5

Cited by 17 publications

(10 citation statements)

References 35 publications

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“…To solve this problem, we should find the optimal feed stages of alcohols (NF OH ) and acetic acid (NF AC ) that can significantly affect each reaction extent of the three reactions. To find NF OH and NF AC , we performed sensitivity analyses with a bottom liquid composition constraint of x AmAC > 0.33, x BuAC > 0.33, and x HexAC > 0.33 because the bottom product stream needs to contain over 99 mol % esters in the RD column …”

Section: Design Alternativesmentioning

confidence: 99%

“…Significant reductions in energy consumption are essential for decreasing operating costs and CO 2 emissions in distillation processes. One of the methods for energy savings is an integrated process that incorporates a vapor recompression heat pump (VRHP) into the RD system. − The VRHP recompresses the overhead gas stream to provide heat to the reboiler, and the control valve depressurizes the cooled vapor stream for endowing the condenser with an extra cooling duty. Several studies have shown the effect of the installation of the VRHP to the RD process with a total reduction of energy consumption by 32.1–32.8% over the energy consumption of the VRHP-free RD process. , …”

Section: Introductionmentioning

confidence: 99%

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Enhanced Energy Savings from Simultaneous Triple Esterification of C4–C6 Alcohols in a Single Reactive Distillation Column

Jang

Namgung

Lee

et al. 2019

Ind. Eng. Chem. Res.

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This paper introduces multiple esterification reactions of three alcohols occurring in a single reactive distillation (RD) column and reports significant energy savings by combining three reactions in the single unit. To realize a feasible integration of the three reactions, the removal of the common water product from the unstable heterogeneous azeotrope should be possible through liquid–liquid decantation in the eight-component system. For this multireaction system, only the direct sequence can produce three esters with a purity higher than 99.0 mol % due to the behavior of liquid–liquid phase equilibrium. We demonstrate an economic evaluation of the direct sequence of a single RD column simultaneously producing the three esters by comparing the direct sequence with the two parallel RD sequences in the same design basis. The total annual cost of the triple esterification direct sequence is reduced by 21.3–25.2% compared to that of the parallel esterification system.

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Section: Design Alternativesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Energy Savings from Simultaneous Triple Esterification of C4–C6 Alcohols in a Single Reactive Distillation Column

Jang

Namgung

Lee

et al. 2019

Ind. Eng. Chem. Res.

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“…TUC is calculated by summing all reboiler and condenser duties in each process. TAC is the sum of annual operating cost and the total capital cost for a payback time of 3 years 54 …”

Section: Pressure Effect On Energy Savings In Hipsdmentioning

confidence: 99%

Synthesis of heat‐integrated pressure‐swing azeotropic distillation using a graphical pinch analysis

et al. 2021

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A new graphical method for the fundamental design of pressure‐swing distillation (PSD) and valid heat integration of the designed process is demonstrated based on a pinch analysis. As the minimum pressure constraint, the pinch pressure is determined by this graphical method to secure the necessary temperature driving force and circumvent the distillation boundaries. For a feasibility evaluation of heat‐integrated PSD (HIPSD), the suggested approach requires visualization of the pinch temperature contours and the feasible composition region of an initial feed according to the pressure change and dynamic properties of ternary azeotropic systems. We thus carried out an in‐depth examination by conducting case studies to show the feasible integration into HIPSD. The new insight is that the HIPSD system can have different pinch pressures depending on the column sequence or the separation order of pure components. In addition, the analysis verifies that energy‐efficient HIPSD can be generated by considering pinch constraints.

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“…Heat integration techniques for recovering heat between separation units or between rectifying and stripping sections of the column are classified into external and internal heat integration. , The external heat integration regards an overhead vapor stream as a heat source and a bottom liquid stream as a heat sink. , As an example, a vapor recompression heat pump (VRHP), which can reduce the reboiler duty of the column, pressurizes the overhead vapor stream, and the compressed vapor is used to boil the bottom liquid. − In the case of an internally heat-integrated distillation column (HIDiC), the vapor stream in the rectifying section provides latent heat to the liquid stream in the stripping section and can reduce the external reboil . External and internal heat integration, which are usually combined for improvement of the energy efficiency and economic performance, complement their own limitations such as complexities of the equipment design and difficulties of the system operation. , In the HIDiC proposed in an earlier study, all trays in the stripping and rectifying sections are thermally coupled using heat exchangers, and a VRHP is employed for additional energy recovery and pressure drop for stream connections.…”

Section: Introductionmentioning

confidence: 99%

Energy-Efficient Design of a Novel Double Annular Separation Column Using Pinch Pressure

Lee

Namgung

et al. 2020

Ind. Eng. Chem. Res.

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This study introduces a pinch-based method to design an internally heat-integrated pressure swing distillation (HIPSD) with a double annular column. In the configuration, the annular stripping section of a low-pressure (LP) column partially wraps around the rectifying section of an inner high-pressure (HP) column to minimize exergy loss. In order to enable adequate heat transfer and azeotropic separation, the key factor is setting the pressure of the columns by considering the so-called pinch pressure, which is determined by the minimum temperature approach and circumvention of the azeotropic boundary. This heat integration between two individual columns reflects different overall heat transfer coefficients for each stage, because they are affected by the composition of the fluid and its hydrodynamic characteristics. Each column is also sized to meet hydraulic conditions to ensure separation efficiency. The HIPSD of several azeotropic mixtures was described and the maximum energy savings reached 23.80%.

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Multiple transesterifications in a reactive dividing wall column integrated with a heat pump

Cited by 17 publications

References 35 publications

Enhanced Energy Savings from Simultaneous Triple Esterification of C4–C6 Alcohols in a Single Reactive Distillation Column

Enhanced Energy Savings from Simultaneous Triple Esterification of C4–C6 Alcohols in a Single Reactive Distillation Column

Synthesis of heat‐integrated pressure‐swing azeotropic distillation using a graphical pinch analysis

Energy-Efficient Design of a Novel Double Annular Separation Column Using Pinch Pressure

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