[Preparation method] Toluene and anhydrous aluminum trichloride are heated, the temperature is controlled at 45 to 50 ° C, phthalic anhydride is added under external cooling, and the mixture is kept warm until the reaction is completed. The reaction mixture was poured into a 10% aqueous solution of sulfuric acid, and the product-containing slurry was washed with water, separated, and separated. The solvent layer containing the product is mixed with 5% sodium carbonate solution, filtered, washed, and dried to obtain 2-p-toluobenzoic acid, which is then closed with fuming sulfuric acid at 115 ° C for 1 h, and the product is poured into cold water, filtered, Washed and dried.
[Safety] Low toxicity. Can cause allergic eczema, rhinitis, bronchial asthma. The production equipment should be sealed, the workshop should be well ventilated, and the operators should wear protective equipment. It is packed in a plastic bag lined with a woven bag or iron drum and stored in a cool, dry and ventilated place. Keep away from fire and heat. Store and transport according to the general toxic chemicals regulations.