Abstract:

The corrosion of the ketobenzene dewaxing unit often occurs in the solvent recovery system. The temperature and pH values of the corrosive medium in the solvent recovery system were tested to study the corrosion law. It is found that there are small molecule organic acids in the circulating solvent, and the corrosion of the solvent system may be caused by small molecule organic acids; the corrosion rate of the deketone tower bottom drainage increases with the increase of temperature, and the corrosion rate of the circulating solvent increases first and then decreases with the increase of temperature, and the corrosion product is iron oxide, which is easy to be washed away. The corrosion rate of the deketone tower bottom drainage decreases first, then increases, and then decreases with the increase of pH value. For the corrosion of small molecule organic acid, it is suggested that the pH value can be controlled at 6～9 to control the corrosion of solvent system.