Terephthalic Acid Hydropurification over Pd/C Catalyst

Zhou, Jinghong; Shen, Guobin; Zhu, Jin; Wang, Yuan

doi:10.1016/s0167-2991(06)81591-0

Cited by 22 publications

(21 citation statements)

References 1 publication

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“…The dissolved oxygen increases the decarbonylation reaction rate. 39 The 4-CBA hydropurification reactions and the corresponding rates are given in Table 2; 52 r 1 , r 2 , and r 3 introduce the rate of the first, second, and third reactions in kmol/(kg•s). R is the universal gas constant in J/(mol The industrial Pd/C catalysts deactivate during the hydropurification process because of thermal sintering.…”

Section: Mathematical Model Developementmentioning

confidence: 99%

“…One of the important applications of TBRs is in the hydropurification process of a purified terephthalic acid (PTA) production plant, which is a raw material/ precursor for production of polyethylene terephthalate (PET). , PTA and ethylene glycol (EG) are the feedstocks for the commercial production of PET, which is extensively utilized to produce fibers, beverage bottles, pharmaceutical products, cosmetics, and food packaging films. Since PET market demand is increasing, the PTA production has significantly increased as well.…”

Section: Hydropurification Process Overviewmentioning

confidence: 99%

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Dynamic Modeling Strategy To Assess Impacts of Hydrodynamic Parameters on Industrial Hydropurification Process by Considering Catalyst Deactivation

Azarpour

Rezaei

Zendehboudi

2018

Ind. Eng. Chem. Res.

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In this study, modeling and simulation of the dynamic behavior of an industrial-scale trickle bed reactor (TBR) with application to a hydropurification process for production of purified terephthalic acid (PTA) are carried out. The impacts of hydrodynamic parameters such as reactor bed porosity, liquid hourly space velocity (LHSV), and liquid–solid and gas–liquid mass transfer coefficients on the industrial hydropurification TBR performance (in particular, on the catalyst lifetime) are analyzed. As the palladium supported on carbon (Pd/C) catalyst deactivates with time, the concentration of impurities in the product, especially 4-carboxybenzaldehyde (4-CBA) as the main impurity of PTA, increases. The three-phase dynamic mathematical model developed in this research work is validated against the plant data, and an average relative error of 2.2% is obtained for the concentration of 4-CBA. The lifetime of the catalyst based on plant data is 348.2 ± 5.0 days; this value is estimated to be 365.1 days from the simulation results, showing a 4.8% error. According to the sensitivity analysis on the model parameters, the effects of LHSV and bed porosity are in the same direction and magnitude, while the effects of the liquid–solid and gas–liquid mass transfer coefficients are in the opposite direction, and their impacts are also less significant. These parameters are disturbed in a range of up to ±15%, compared to the normal operating conditions that results in an absolute catalyst lifetime change of 2.9%–14.2%. The maximum and minimum variations in the catalyst lifetime are obtained when LHSV is disturbed by ±10%, exhibiting a catalyst lifetime change of 14.2% at a −10% disturbance (416.9 days) and −6.5% at a +10% disturbance (341.3 days). A +15% disturbance in the liquid–solid mass transfer coefficient increases the catalyst lifetime by 2.9% (375.8 days), and a −15% disturbance decreases this vital parameter by 3.7% (351.8 days). Eventually, the findings of this study might be applied to the relevant industrial sectors, providing the required close and meticulous control of the process.

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Section: Mathematical Model Developementmentioning

confidence: 99%

Section: Hydropurification Process Overviewmentioning

confidence: 99%

Dynamic Modeling Strategy To Assess Impacts of Hydrodynamic Parameters on Industrial Hydropurification Process by Considering Catalyst Deactivation

Azarpour

Rezaei

Zendehboudi

2018

Ind. Eng. Chem. Res.

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“…PET in SubCW decomposes into the major monomers TPA and EG and other secondary products [19][20][21]. TPA is an organic component usually produced by homogeneous oxidation of p-xylene in the liquid phase [22]. TPA is of great industrial importance as a raw material for various widely used plastics, such as PET, polybutyl terephthalate (PBT), and bioplastics, which have been in great demand recently [23].…”

Section: Introductionmentioning

confidence: 99%

Kinetics Study of Hydrothermal Degradation of PET Waste into Useful Products

et al. 2021

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Kinetics of hydrothermal degradation of colorless polyethylene terephthalate (PET) waste was studied at two temperatures (300 °C and 350 °C) and reaction times from 1 to 240 min. PET waste was decomposed in subcritical water (SubCW) by hydrolysis to terephthalic acid (TPA) and ethylene glycol (EG) as the main products. This was followed by further degradation of TPA to benzoic acid by decarboxylation and degradation of EG to acetaldehyde by a dehydration reaction. Furthermore, by-products such as isophthalic acid (IPA) and 1,4-dioxane were also detected in the reaction mixture. Taking into account these most represented products, a simplified kinetic model describing the degradation of PET has been developed, considering irreversible consecutive reactions that take place as parallel in reaction mixture. The reaction rate constants (k1-k6) for the individual reactions were calculated and it was observed that all reactions follow first-order kinetics.

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“…Chemical reaction kinetics, as an important component of chemical theory, can answer the question of the rate and mechanism of chemical reaction. Up to now, the firstorder or second-order reaction kinetic model is often used in the literature to deal with the reaction process kinetic curve and find out the first-order or second-order reaction kinetic rate constant; The apparent activation energy can be calculated based on the rate constant at different temperatures and Arrhenius equation [2] .…”

Section: Introductionmentioning

confidence: 99%

Study on Hydrolysis Reaction Rate of Several Chemical Warfare Agents

Dai

2021

E3S Web Conf.

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According to the first-order kinetic reaction equation, the hydrolysis rate constants of homogeneous and heterogeneous phase of eight poisons under different conditions were calculated, and the relationship between hydrolysis rate constants and temperature was obtained according to the arrhenius formula, and the activation energy of hydrolysis reaction of some poisons was calculated. The evolution curve of homogeneous hydrolysis rate of 0.5 g/L HD with time was collected by T-135 method, and the hydrolysis rate was 0.1 min-1 and the half-life was 7 min. Poison concentration, pH of system, environmental temperature and structural composition of soil all affect the hydrolysis rate of Chemical Warfare Agents.

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Terephthalic Acid Hydropurification over Pd/C Catalyst

Cited by 22 publications

References 1 publication

Dynamic Modeling Strategy To Assess Impacts of Hydrodynamic Parameters on Industrial Hydropurification Process by Considering Catalyst Deactivation

Dynamic Modeling Strategy To Assess Impacts of Hydrodynamic Parameters on Industrial Hydropurification Process by Considering Catalyst Deactivation

Kinetics Study of Hydrothermal Degradation of PET Waste into Useful Products

Study on Hydrolysis Reaction Rate of Several Chemical Warfare Agents

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