Five production methods of o-chlorobenzoic acid

1. O-chlorotoluene is used as raw material for chlorination under photocatalysis to generate trichloromethyl o-chlorobenzene, which is then obtained by hydrolysis.

2. It is obtained by oxidation with o-chlorotoluene as raw material and potassium permanganate as oxidant.

3. Using anthranilic acid as raw material, diazotizing reaction with sodium nitrite in hydrochloric acid solution to generate diazonium salt, which is obtained by reacting with hydrochloric acid under the action of copper chloride.

4. Place the o-chlorotoluene in the reaction kettle, illuminate with ultraviolet light, the reaction temperature is 100 ℃, and pass chlorine gas to carry out the chlorination reaction, deepen the chlorination reaction depth to produce α, α, α, 2-tetrachlorotoluene, or use Ortho-chlorotoluene is used as the raw material, and azobisisobutyronitrile is used as the catalyst for chlorination to obtain α, α, α, 2-tetrachlorotoluene. Then the above product is transferred to the hydrolysis kettle, and a little acid is added to make it hydrolyze to form ortho Chlorobenzoyl chloride, o-chlorobenzoic acid and chlorobenzoic acid can be obtained when the depth of hydrolysis is large.

5. Add hydrochloric acid and sodium nitrite as raw materials for diazotization, and then add a solution of Cu2Cl2 dissolved in hydrochloric acid to the diazonium solution, stir while adding, and obtain o-chlorobenzoic acid after post-treatment.