2-Ethylhexanoic Acid CAS 149-57-5

Add 500g of isooctyl alcohol, 258g of potassium hydroxide, 10g of zinc formate to a 2000ml autoclave. The reactor is replaced with nitrogen twice to exhaust the air from the system. After sealing, the reaction is carried out at 230°C and 2Mpa. The reaction proceeds. After 6h, keep holding for 50min, then lower the temperature to below 160℃, then reduce the pressure in the kettle to normal pressure, add 400ml of distilled water and stir for 30min to obtain an aqueous solution of potassium isooctanoate.

Transfer the potassium isooctanoate aqueous solution to the flask, slowly add 212g of 94wt% formic acid solution under stirring, control the reaction temperature to 60℃, react for 30min, transfer to a separatory funnel, stand for 30min, separate the water phase by layer, Simple concentration to obtain potassium formate solution (the solution can be sold directly as a commercial product or concentrated to a certain concentration such as 74%); the oil phase is washed twice with 60g distilled water to obtain crude isooctanoic acid, and the unreacted alcohol is removed by vacuum distillation, and the product is obtained by rectification The finished product of isooctanoic acid is 542 g, and the weight yield based on isooctyl alcohol is 108.4%, and the molar yield is 97.92%.

Add 250g of isooctyl alcohol, 172g of caustic soda, 1.6g of zinc acetate, and then add 250g of isooctyl alcohol to a 2000ml autoclave. After condensation, it is discharged outside. When there is no hydrogen evolution in the reaction, the pressure is maintained for 40 minutes, the temperature is lowered to below 120°C, then the pressure in the kettle is reduced to normal pressure, 500 ml of distilled water is added, and the mixture is stirred for 30 minutes to obtain an aqueous sodium isooctanoate solution.

Add 350g of distilled water to another flask, slowly add 250g of concentrated sulfuric acid under stirring, keep the temperature in the flask not exceeding 80°C, slowly pour the reactants in the autoclave into the flask, control the reaction temperature to 70°C, react for 40min, and move to Separate funnel, keep the temperature at rest for 1 hour, and then separate the water phase to remove the water phase. After the water phase is treated, refined sodium sulfate is recovered; the oil phase is washed twice with distilled water at about 70°C to obtain crude isooctanoic acid, and the unreacted alcohol is removed by distillation under reduced pressure , Rectification to get the finished product of isooctanoic acid with a yield of 105%.