NMSBA produced from NMST under the catalysis of supported H3PW12O40 and Co/Mn/Br catalytic system

He, Heng; Fang, Zhou-wen; Zhang, Chao; Long, Xiang‐li

doi:10.1002/cjce.23085

Cited by 7 publications

(2 citation statements)

References 24 publications

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“…Long et al [ 10 ] put forward a homogeneous quaternary system composed of Co/Mn/Br/H 3 PW 12 O 40 to catalyze the oxidation of NMST to NMSBA by air in acetic acid at 215°C and 3.0 MPa. He et al [ 11 ] decreased the usage of H 3 PW 12 O 40 , accelerated NMST oxidation, and increased NMSBA yield with a heterogeneous catalytic system by immobilizing H 3 PW 12 O 40 on activated carbon. Wen et al [ 12 ] improved the catalytic capability of H 3 PW 12 O 4 @C by modifying the carbon with a ZnCl 2 solution.…”

Section: Introductionmentioning

confidence: 99%

Production of NMSBA from the oxidation of NMST in the homogeneous Co/Mn/Br/H₃PMo_xW_12−xO₄₀ catalytic system

et al. 2023

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2-nitro-4-methylsulphonylbenzoic acid (NMSBA) is an important intermediate for the preparation of the highly effective herbicide mesotrione. NMSBA is produced from the oxidation of 2-nitro-4-methylsulphonyltoluene (NMST) by nitric acid commercially, which suffers from the serious problems of low yield and heavy pollution. In this paper, a homogeneous system consisting of Co/Mn/Br/ Á H 3 PMo x W 12Àx O 40 has been applied to catalyze the production of NMSBA by oxidizing NMST with oxygen in acetic acid. The experiments indicate that the best value of x in the phosphomolybdenum tungsten heteropoly acid is 3. The optimum composition of this catalyst system is 1163 ppm H 3 Pmo 3 W 9 O 40 Á 12.17H 2 O, 247.5 ppm Co, 453.5 ppm Mn, and 1075 ppm Br. Such a catalytic system is able to achieve a NMST conversion of 94.93% and a NMSBA selectivity of 99.84%. H 3 PMo 3 W 9 O 40 exceeds both H 3 PMo 12 O 40 and H 3 PW 12 O 40 as a catalyst in the production of NMSBA from the oxidation of NMST by oxygen. K E Y W O R D S 2-nitro-4-methylsulphonylbenzoic acid, 2-nitro-4-methylsulphonyltoluene, catalytic oxidation, phosphomolybdenum tungsten heteropoly acid

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Section: Introductionmentioning

confidence: 99%

Production of NMSBA from the oxidation of NMST in the homogeneous Co/Mn/Br/H₃PMo_xW_12−xO₄₀ catalytic system

et al. 2023

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“…Long et al 8 obtained a NMSBA yield of over 80% at 215 °C and 3.0 MPa by oxidizing NMST with air for 2.5 h in acetic acid under the aid of the multi component homogeneous catalytic system composed of Co-Mn-Br-phosphotungstic acid. He et al 9 constructed the heterogeneous catalytic system of Co-Mn-Br-phosphotungstic acid@CAC by supporting phosphotungstic acid on commercial activated carbon (CAC) to speed up the oxidation of NMST to NMSBA. It was found that the amount of phosphotungstic acid was greatly reduced and the NMSBA yield was improved conspicuously.…”

Section: Introductionmentioning

confidence: 99%

Production of NMSBA catalyzed by Co/Mn/Br together with the porous carbon made from coconut shell with ZnCl₂ as activator

Wang

Yang

Guo

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND 2‐nitro‐4‐methylsulfonylbenzoic acid (NMSBA) is commercially produced from the oxidation of 2‐nitro‐4‐methylsulfonyltoluene (NMST) with nitric acid as oxidant and V2O5 as catalyst in a strong acid solution; this process suffers from the following shortcomings: the discharge of large amounts of wastewater and waste gas, as along with the generation of polynitro compounds. It is necessary to develop a technology to avoid the pollution caused by oxidizing NMST with nitric acid. NMSBA can be synthesized by oxidizing NMST with air under the catalysis of the porous carbon made from coconut shell with ZnCl2 as an activator together with Co/Mn/Br. RESULTS The optimum conditions for the preparation of the porous carbon are as follows: impregnation temperature 60 °C, ZnCl2 concentration 0.50 mol L−1, impregnation duration 6 h, carbonization temperature 600 °C, and carbonization time 4 h. The surface characterization suggests that the carbon made in this study holds smaller surface area, acidic groups, and basic groups than the commercial carbon but owns more carboxyl. CONCLUSION The Co/Mn/Br/AC (AC,the porous carbon made in this study) catalytic system is superior to the Co/Mn/Br/H3PMo12O40@CAC(CAC,commercial activated carbon) catalytic system in the production of NMSBA from the oxidation of NMST. The NMSBA selectivity gained by the former is 93.40%, while that gained by the latter is 87.14%. The former can cut down the consumption of NMST and the expenditure of catalysts. The catalytic ability of the AC catalyst relies on its surface chemical characteristics and physical properties. More carboxyl on AC is the reason for the upgrade of NMSBA selectivity. © 2022 Society of Chemical Industry (SCI).

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Metal-free catalyzed aerobic oxidation of 2-nitro-4-methylsulfone toluene to 2-nitro-4-methylsulfonylbenzoic acid using a continuous-flow reactor

Liu

et al. 2022

J Flow Chem

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NMSBA produced from NMST under the catalysis of supported H₃PW₁₂O₄₀ and Co/Mn/Br catalytic system

Cited by 7 publications

References 24 publications

Production of NMSBA from the oxidation of NMST in the homogeneous Co/Mn/Br/H₃PMo_xW_12−xO₄₀ catalytic system

Production of NMSBA from the oxidation of NMST in the homogeneous Co/Mn/Br/H₃PMo_xW_12−xO₄₀ catalytic system

Production of NMSBA catalyzed by Co/Mn/Br together with the porous carbon made from coconut shell with ZnCl₂ as activator

Metal-free catalyzed aerobic oxidation of 2-nitro-4-methylsulfone toluene to 2-nitro-4-methylsulfonylbenzoic acid using a continuous-flow reactor

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NMSBA produced from NMST under the catalysis of supported H3PW12O40 and Co/Mn/Br catalytic system

Cited by 7 publications

References 24 publications

Production of NMSBA from the oxidation of NMST in the homogeneous Co/Mn/Br/H3PMoxW12−xO40 catalytic system

Production of NMSBA from the oxidation of NMST in the homogeneous Co/Mn/Br/H3PMoxW12−xO40 catalytic system

Production of NMSBA catalyzed by Co/Mn/Br together with the porous carbon made from coconut shell with ZnCl2 as activator

Metal-free catalyzed aerobic oxidation of 2-nitro-4-methylsulfone toluene to 2-nitro-4-methylsulfonylbenzoic acid using a continuous-flow reactor

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NMSBA produced from NMST under the catalysis of supported H₃PW₁₂O₄₀ and Co/Mn/Br catalytic system

Production of NMSBA from the oxidation of NMST in the homogeneous Co/Mn/Br/H₃PMo_xW_12−xO₄₀ catalytic system

Production of NMSBA from the oxidation of NMST in the homogeneous Co/Mn/Br/H₃PMo_xW_12−xO₄₀ catalytic system

Production of NMSBA catalyzed by Co/Mn/Br together with the porous carbon made from coconut shell with ZnCl₂ as activator