Provided is a method of preparing and recovering 2-methyl-5-iodobenzoic acid. The method utilizes o-methylbenzoic acid as raw material, iodinating via iodine/potassium persulfate in a mixed acid solvent to obtain a mixture of 2-methyl-5-iodobenzoic acid, 2-methyl-3-iodobenzoic acid, and 2-methyl-3, 5-diiodobenzoic acid; refining to obtain 2-methyl-5-iodobenzoic acid and recoverable mother liquor, the recoverable mother liquor being a mixture of 2-methyl-5-iodobenzoic acid, 2-methyl-3-iodobenzoic acid, and 2-methyl-3, 5-diiodobenzoic acid; conducting catalytic hydrogenation and deiodination to recover o-methylbenzoic acid and iodide ions; and oxidating the iodide ions to recover iodine. The whole process is recycled. The preparation and recovery method has cheap and easily available raw materials, and is easy of operation, has low requirements for equipment, and is suitable for large-scale industrial production.
本发明提供了一种制备和回收 2-甲基-5-
碘苯甲酸的方法。该方法以邻甲基
苯甲酸为原料,在混合酸溶剂中通过
碘/过
硫酸钾进行
碘化,得到 2-甲基-5-
碘苯甲酸、2-甲基-
3-碘苯甲酸和 2-甲基-3,5-二
碘苯甲酸的混合物;精制以获得 2-甲基-5-
碘苯甲酸和可回收母液,可回收母液是 2-甲基-5-
碘苯甲酸、2-甲基-
3-碘苯甲酸和 2-甲基-3,5-二
碘苯甲酸的混合物;进行催化加氢和脱
碘反应以回收邻甲基
苯甲酸和
碘离子;以及氧化
碘离子以回收
碘。整个过程可循环使用。该制备和回收方法原料便宜易得,操作简便,对设备要求不高,适合大规模工业化生产。