Time-Optimal Startup of a Packed Distillation Column

Flender, M.; Wozny, Günter; Fieg, Georg

doi:10.1016/s1474-6670(17)44915-9

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…The transition between distillation without reflux and distillation with reflux is very fast (10 min), and the column achieves quickly a pseudo-steady-state operation. The start-up of distillation columns is not a straightforward procedure because of the complex transient responses of hydraulic and thermodynamic variables . Hence, the pattern exhibited by the distillation column during the start-up period is considered an important achievement since it reveals an adequate control strategy, which is hard to reach in processes using unknown hydrocarbon feedstocks such as TPO.…”

Section: Resultsmentioning

confidence: 99%

“…The start-up of distillation columns is not a straightforward procedure because of the complex transient responses of hydraulic and thermodynamic variables. 42 Hence, the pattern exhibited by the distillation column during the start-up period is considered an important achievement since it reveals an adequate control strategy, which is hard to reach in processes using unknown hydrocarbon feedstocks such as TPO. Both bottom and top temperatures reach this pseudo-steady state as the liquid is stripped in the reboiler and as the vapor is rectified, respectively.…”

Section: Resultsmentioning

confidence: 99%

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On Fractioning the Tire Pyrolysis Oil in a Pilot-Scale Distillation Plant under Industrially Relevant Conditions

et al. 2023

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Tire pyrolysis oil (TPO) is one of the most interesting products derived from the pyrolysis of end-of-life tires. Among others, it contains valuable chemicals, such as benzene, toluene, ethylbenzene, and xylene (BTEX), as well as limonene. In order to recover these chemicals, a pilot-scale distillation plant has been designed, erected, and operated using TPO derived from an industrial-scale pyrolysis plant. The distillation facility consists of a packed column (20 kg/h) and is within the fifth technological readiness level. This work describes for the first time the fractioning of the TPO in a continuous operational mode under industrially relevant conditions. For this purpose, different reboiler temperatures (250–290 °C) and reflux ratios (up to 2.4) were preliminarily assessed on the yields and properties of the resulting products: light fraction (LF) and heavy fraction (HF). Thus, the distillation plant is capable of producing 27.0–36.7 and 63.3–73.0 wt % of LF and HF, respectively. The highest BTEX concentration in the LF (55.2 wt %) was found using a reboiler temperature of 250 °C and a reflux ratio of 2.4. Contrarily, the highest limonene concentration (4.9 wt %) in the LF was obtained at 290 °C in the reboiler without reflux. In this sense, the lower the reboiler temperature, the higher the BTEX, and the lower the limonene concentration in the LF. The main results herein obtained serve to gain key insights to operate packed distillation columns using complex and promising hydrocarbons as TPO in order to recover valuable products. In addition, this work provides significant information for optimizing the recovery efficiencies of both BTEX and limonene, as well as their potential applications including that for the resulting HF.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

On Fractioning the Tire Pyrolysis Oil in a Pilot-Scale Distillation Plant under Industrially Relevant Conditions

et al. 2023

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“…Albet et al (1994) published a dynamic model for startup, in which equations were switched as soon as certain criteria are met, e.g., the reboiler reaches the boiling temperature. Flender et al (1998) and Flender (1998) also developed modeling approaches for column startup but neglected the transition from an empty column until the startup of the reboiler. This approach was extended by Wang et al (2003) for batch distillation.…”

Section: Introductionmentioning

confidence: 99%