Liquid-phase ethylbenzene oxidation to hydroperoxide with barium catalysts

Toribio, P.P.; Campos‐Martín, Jose M.; Fierro, J.L.G.

doi:10.1016/j.molcata.2004.10.003

Cited by 27 publications

(14 citation statements)

References 9 publications

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“…Consequently, alkaline-earth compounds have been used as the catalysts for the oxidation of the alkylbenzenes to the corresponding hydroperoxides [12]. MgO is often chosen as the supporter to enhance the specific surface area of the catalyst [13].…”

Section: Introductionmentioning

confidence: 99%

Catalytic activity of Cu/MgO in liquid phase oxidation of cumene

Huang

Zhang

et al. 2009

Korean J. Chem. Eng.

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Cumene was oxidized with air as the oxidant and Cu/MgO as the catalyst. Cu/MgO with different compositions was prepared by co-precipitation and then characterized by X-ray diffraction (XRD), H 2 -temperature programmed reduction (H 2 -TPR) and X-ray photoelectron spectroscopy (XPS). The characterization results showed that CuO dispersed on MgO well in the cases that the Cu content in Cu/MgO was 1% by molar. In this catalytic system, MgO did not only act as the supporter, but also as the catalyst to activate the tertiary C-H of cumene. The conversion of cumene was increased by using CuO as the promoter on MgO catalyst. The cumene conversion and cumene hydroperoxide (CHP) selectivity were in a trade-off relationship because cumene oxidation was subject to the decomposition of CHP. Thus, the effects of the operating variables were investigated and the relevant mechanism was discussed.

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Section: Introductionmentioning

confidence: 99%

Catalytic activity of Cu/MgO in liquid phase oxidation of cumene

Huang

Zhang

et al. 2009

Korean J. Chem. Eng.

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“…In the industrial unit, the EB conversion is controlled at less than 13% to ensure that the PEHP selectivity is greater than 90%. 4 Temperature effect. In order to evaluate the effect of temperature on EB conversion and selectivity to PEHP for EB autoxidation reaction, four temperatures of 120, 140, 148, and 155 °C were selected.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…1−3 The organic hydroperoxides (ROOHs) are interesting products of hydrocarbon autoxidation which are used as oxidizing agents for olefins. 4 Important examples include cumene hydroperoxide production (more than 5 × 10 6 annual tons) from the oxidation of the cumene (Hock process; for phenol and acetone production) 5 and the synthesis of terephthalic acid from p-xylene oxidation 6 or from methane 7 (50 × 10 6 annual tons) for the polyester industry.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The selective liquid phase air oxidation (autoxidation) of alkylbenzenes to valuable oxygenated products (ketones, aldehydes, and carboxylic acids) through their hydroperoxide intermediates is a chemical reaction of great industrial importance. − The organic hydroperoxides (ROOHs) are interesting products of hydrocarbon autoxidation which are used as oxidizing agents for olefins . Important examples include cumene hydroperoxide production (more than 5 × 10 6 annual tons) from the oxidation of the cumene (Hock process; for phenol and acetone production) and the synthesis of terephthalic acid from p -xylene oxidation or from methane (50 × 10 6 annual tons) for the polyester industry.…”

Section: Introductionmentioning

confidence: 99%

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Noncatalytic Liquid Phase Air Oxidation of Ethylbenzene to 1-Phenyl Ethyl Hydroperoxide in Low Oxygen Volume Fraction

Roohi

Rajabi

2018

Org. Process Res. Dev.

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The catalyst- and solvent-free liquid phase air oxidation reaction of ethylbenzene (EB) to 1-phenyl ethyl hydroperoxide (PEHP) was investigated at scheduled temperature and pressure with a separate deacidifying zone. The oxidation reaction was done in the titanium fabricated reactor at an oxygen volume fraction in the outlet gas less than 0.3%. The effects of several reaction parameters were studied in detail. In the optimal reaction conditions and instructions given in this work, the high selectivity to PEHP (above 95%) was achieved with EB conversion around 13%, and a clean feed (water and acid-free) was provided for the propene epoxidation reaction.

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“…Nonetheless, some authors have described the use of NHPI in hydrocarbon autoxidation, in which it acts as a catalyst and does not require the presence of a transition metal compound [16,17] In present industrial practice, ethylbenzene oxidation to its hydroperoxide is performed without solvent, using air as a source of oxygen, at temperatures ranging from 400 to 443 K, and slightly over atmospheric pressure to keep ethylbenzene in liquid phase (0.2 to 1.0 MPa) [24][25][26][27][28][29]. Another common practice is the addition to the reaction mixture of minute quantities of alkaline metals, such as sodium [24][25][26][27], alkaline-earth compounds, in particular barium [29,30], or organic salts [31] to increase the yield to hydroperoxides.…”

Section: Abstract: Autoxidation Organocatalysis Homogeneous Catalysmentioning

confidence: 99%