Hydrogenation of 2‐ethylanthraquinone under Taylor flow in single square channel monolith reactors

Abstract

in Wiley InterScience (www.interscience.wiley.com).The hydrogenation of 2-ethylanthraquinone (EAQ) to 2-ethylanthrahydroquinone (EAHQ) was carried out under Taylor flow in single square channel monolith reactors. The two opening ends of opaque reaction channel were connected with two circular transparent quartz-glass capillaries, where Taylor flow hydrodynamics parameters were measured and further used to obtain practical flow state of reactants in square reaction channels. A carefully designed gas-liquid inlet mixer was used to supply steady gas bubbles and liquid slugs with desired length. The effects of various operating parameters, involving superficial gas velocity, superficial liquid velocity, gas bubble length, liquid slug length, two-phase velocity and temperature, on EAQ conversion were systematically researched. Based on EAQ conversion, experimental overall volumetric mass transfer coefficients were calculated, and also studied as functions of various parameters as mentioned earlier. The film model, penetration model, and existing semi-empirical formula were used to predict gas-solid, gas-liquid, and liquid-solid volumetric mass transfer coefficients in Taylor flow, respectively. The predicted overall volumetric mass transfer coefficients agreed well with the experimental ones.

Fabrication of supported Pd–Ir/Al2O3 bimetallic catalysts for 2‐ethylanthraquinone hydrogenation

“…[1][2][3] The main industrial method for synthesis of H 2 O 2 is the anthraquinone process. [4][5][6][7] In this cyclic process (Scheme 1), 2ethylanthraquinone (eAQ) is hydrogenated to yield 2ethylanthrahydroquinone (eAQH 2 ). Oxidation of eAQH 2 by O 2 results in the formation of H 2 O 2 and the regeneration of the original eAQ.…”

“…Hydrogen peroxide (H 2 O 2 ) is widely used as an environmentally friendly oxidizing agent in the electronics, pharmaceutical, papermaking and wastewater treatment industries . The main industrial method for synthesis of H 2 O 2 is the anthraquinone process . In this cyclic process (Scheme ), 2‐ethylanthraquinone (eAQ) is hydrogenated to yield 2‐ethylanthrahydroquinone (eAQH 2 ).…”

Hydrogenation of dimethyl oxalate to ethylene glycol on a Cu/SiO2/cordierite monolithic catalyst: Enhanced internal mass transfer and stability

“…Compared with the traditional packed‐bed reactor, the monolithic catalyst has several inherent advantages such as high‐transport rates of heat and mass per unit pressure drop, high surface area to volume ratios, small transverse temperature gradients and ease of scale‐up 27–29. It has been widely used in treating the exhaust from gasoline powered vehicles, catalytic oxidation of VOCs, removal of NO x from lean burn and diesel engines, power plant, and furnace exhaust gases for the last two decades 30–33.…”

Synthesis of hydrogen peroxide over Pd/SiO2/COR monolith catalysts by anthraquinone method

“…Damkohler number (Da) (defined as Da = chemicalreaction rate/external diffusion rate) was introduced to determine whether the hydrogenation process is controlled by chemical reaction or by external diffusion [39]. The external diffusion rate was calculated by the correlation [40], and the chemical reaction rate came from literature [41,42]. The results shows that Da ≥ 10 (Da = 12-20 when the pressure is in the range of 0.1-1.0 MPa), indicating that the hydrogenation process rate is more predominated by external diffusion than by reaction rate.…”