Hydrogen response in liquid propylene polymerization: Towards a generalized model

Ali, Majid; Betlem, Bernardus H.L.; Roffel, Brian; Weickert, G.

doi:10.1002/aic.10783

Cited by 27 publications

(28 citation statements)

References 42 publications

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“…The effect of hydrogen and electron donor as regulating agents of Ziegler-Natta-catalyzed propylene polymerization is supported by several experimental studies, e.g. Al-haj Ali et al (2006) and Garoff et al (2003). A rigorous kinetic model would consider separate effects of initiation, propagation, chain transfer to hydrogen, chain transfer to monomer, various types of deactivation, reactivation with hydrogen, etc.…”

Section: Polymerization Reaction Modelmentioning

confidence: 99%

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Optimal planning and feedstock-mix selection for multiproduct polymer production

Marchetti

Zamarripa

Reyes‐Labarta

et al. 2016

Computers & Chemical Engineering

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Highlights•Manufacture of multiple polymer grades in a polypropylene production facility is addressed. •Single and multiple product NLP formulations are presented for production planning •The trade-off between feedstocks costs and production rates is considered.•Proposed formulation has been implemented with user-friendly computer interface. AbstractIn this paper, we describe a nonlinear programming model to determine the optimal balance of feedstocks to manufacture multiple polymer grades in a polypropylene production facility. The main units of the process are a distillation column and a polymerization reactor, for which accurate short-cut process models were developed. Both a single and multiple product formulations are presented. The proposed models seek to maximize the plant throughput while minimizing the production costs. The possibility of adding extra production is also considered. The formulations are applied to several case studies, both to analyze the performance of the model and to illustrate its potential economic impact. The trade-off between feedstocks costs and production rates is analyzed by solving the multiple-product model with different time horizons. An annualized-slate long term case study is presented. The proposed formulation with a user-friendly interface has been deployed to assist with commercial and operation decisions at the plant.2

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Section: Polymerization Reaction Modelmentioning

confidence: 99%

“…Simplified kinetic models with kinetic parameters obtained from quantitative experimental data have been developed by Matos et al (2001), Matos et al (2002), and Al-haj Ali et al (2006), among others.…”

Section: Polymerization Reaction Modelmentioning

confidence: 99%

Optimal planning and feedstock-mix selection for multiproduct polymer production

Marchetti

Zamarripa

Reyes‐Labarta

et al. 2016

Computers & Chemical Engineering

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“…Olefin polymerization kinetics with Ziegler-Natta catalysts is fairly complex. The subject has been discussed in Al-haj Ali et al [10].…”

Section: Process Descriptionmentioning

confidence: 99%

Optimal grade transition control for liquid‐propylene polymerization reactor

Ali

2010

Asian Journal of Control

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A nonlinear control system integrating an off-line optimizer and a nonlinear model-based controller is developed to perform optimal grade transition operations in a continuous pilot plant reactor. A simple black-box model is developed and used to determine optimal trajectories of inputs and outputs for a series of three polypropylene grades. The simplified model is also used to develop a nonlinear controller. This controller is similar to generic model control; however, the integral action is omitted and an on-line updating scheme is incorporated to update pre-specified model parameters using delayed process measurements. The time optimal inputs, which are calculated by the off-line optimizer, are introduced to the plant in a feedforward manner. At the same time, the deviations from the optimal output are corrected using the feedback nonlinear controller. The simulations on a complex mechanistic model of the process reveal that the nonlinear control scheme performs well for both set point tracking and disturbance rejection. This paper integrates well-known methodologies, such as the generic-model control algorithm, parameter update schemes, and off-line optimization, together to develop an applicable and robust control technique for continuous polymerization reactors.

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“…The information during this period given by dilatometry is consistent with the present state of knowledge concerning this type of polymerization process. This issue is discussed in more detail in Al-haj Ali et al [26] Second, since the difference between the estimated polymerization rates using both techniques is small, the assumption of constant fitting parameters, M 1 and M 2 in Equation (9), seems acceptable; consequently band k could be assumed constant since other parameters in Equation (10) and (11) are independent of the specific experiment. Polymerization rate is calculated also using isoperibolic calorimetry.…”

Section: Pressure-drop Dilatometrymentioning

confidence: 99%

Estimation of the Polymerization Rate of Liquid Propylene Using Adiabatic Reaction Calorimetry and Reaction Dilatometry

Ali

Betlem

Roffel

et al. 2007

Macro Reaction Engineering

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The use of pressure‐drop and constant‐pressure dilatometry for obtaining rate data for liquid propylene polymerization in filled batch reactors was examined. The first method uses reaction temperature and pressure as well as the compressibility of the reactor contents to calculate the polymerization rate; in the second, the polymerization rate is calculated from the monomer feed rate to the reactor. Estimated polymerization rates compare well to those obtained using the well‐developed isoperibolic calorimetry technique, besides pressure‐drop dilatometry provides more kinetic information during the initial stages of the polymerization than the other methods.magnified image

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Hydrogen response in liquid propylene polymerization: Towards a generalized model

Cited by 27 publications

References 42 publications

Optimal planning and feedstock-mix selection for multiproduct polymer production

Optimal planning and feedstock-mix selection for multiproduct polymer production

Optimal grade transition control for liquid‐propylene polymerization reactor

Estimation of the Polymerization Rate of Liquid Propylene Using Adiabatic Reaction Calorimetry and Reaction Dilatometry

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