P-toluic acid is a white crystal. Used in organic synthesis intermediates, pesticide industry to prepare fungicide phosphoramide, can also be used in perfumery and film.
1. It is obtained by catalytic oxidation of p-xylene with air. When the atmospheric pressure method is used, xylene and cobalt naphthenate can be added to the reaction pot, and the air is introduced into the reactor when heated to 90 ° C, the temperature is controlled at 110-115 ° C, the reaction is about 24 h, and about 5% of the para-xylene is converted into p-Methylbenzoic acid. Cool to room temperature, filter, filter cake washed with p-xylene and dried to give p-methylbenzoic acid.
2. It is obtained by oxidation of p-isopropyl toluene with nitric acid. 20% nitric acid and p-isopropyl toluene were mixed, stirred and heated to 80-90 ° C, reacted for 4 h, and then heated to 90-95 ° C for 6 h. After cooling, filtration, the cake was recrystallized from toluene to give p-methylbenzoic acid in a yield of 50-53%.
4-METHYLBENZOIC ACID ZONE REFINED
Colorless crystal or white crystalline powder
Cool,dry and hermetic place