p-Toluic acid (p-Toluic acid)

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p-Toluic acid

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Benzoic acid, 4-methyl-
2PNS-Q06-0
p-Toluic acid
para-toluic acid
p-methyl benzoic acid
p-toluenecarboxylic acid
4-methyl-benzoic acid
4'-Methylbiphenyl-2-sulfonyl chloride
4'-methyl-2-biphenylsulphonyl chloride
p-toluenebenzenesulfonyl chloride
p-toluylic acid
p-Me-benzoic acid

+Expand -Stow

99-94-5

C8H8O2

136.148

29163900

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Nature Description

White Crystal. The melting point is 182 °c and the boiling point is 275 °c (sublimation). Soluble in methanol, ethanol, ether, insoluble in hot water. Volatilizing with the evaporation of water.

274-275oC

179-182oC

<0.1G/100MLAT19oC

Product Applications

Used for dye, medicine, pesticide and plastic synthesis.

Production method

1. It is prepared by catalytic oxidation of p-xylene with air. When normal pressure method is adopted, xylene and cobalt naphthenic acid can be added to the reaction pot, and air can be introduced when heated to 90℃. The temperature is controlled at 110-115 ℃, and the reaction time is about 24 hours, about 5 p-xylene can be converted to p-toluylic acid. Cool to room temperature, filter, filter cake wash with p-xylene, dry, get p-toluylic acid. And p-xylene is recycled. Yield 30-40. When the pressure oxidation method is adopted, the reaction temperature is 125℃, the pressure is 0.25MPa, the ventilation volume is 250L for 1 hour, and the reaction time is 6 hours. The unreacted xylene was then distilled off with steam, and the oxidation material was acidified with concentrated hydrochloric acid to a pH of 2. Stir to cool and filter. Filter cake soak it with p-xylene and then filter it. The drying result is p-toluylic acid, the content is above 96, the conversion rate of p-xylene is 40, and the yield is 60-70. 2. Prepared by oxidation of p-isopropyl toluene with nitric acid. Mix 20 nitric acid with P-isopropyl toluene, stir and heat up to 80-90 °c, react for 4 hours, and then raise the temperature to 90-95 °c for 6 hours. Cooling, filtering, filter cake with toluene to obtain p-toluylic acid, the yield is 50-53. In addition, paraxylene can be oxidized with concentrated nitric acid and reacted for 30 hours, with a yield of 58.