How to pickling the glass lined reactor

Pickling has become one of the common cleaning methods for glass lined reactors, and the so-called acids are corrosive, so the acid we use for cleaning also requires special configuration, so the pickling cleaning solution suitable for the enamel layer material is How to configure it, we will introduce them one by one.

Pickling cleaning solution formula:

(1) nitric acid 5%～1.0%, hydrofluoric acid 0.5%～10%, corrosion inhibitor Lan-826 0.25%～0.30%;

(2) Hydrofluoric acid 1%～2%, corrosion inhibitor Lan-826 0.20%～0.25%;

(3) Citric acid 2%～3%, ammonia water (adjust pH=3.5～4.0), corrosion inhibitor Lan-826 0.1%～0.2%.

Pickling is one of the methods of washing glass lined reactors. The method of pickling is to drain the flushing water with nitrogen and pump the prepared pickling solution into the system. When the cleaning solution returns, pass the venting and guide shower inspection Whether the pickling liquid is full, make sure it is full, then use the pump to circulate cleaning and switch the direction regularly. In the circulation process, the sewage and venting are carried out at regular intervals to avoid air resistance and guide leaching clogging, which will affect the cleaning effect.

The purpose of washing with water after pickling is to remove residual pickling liquid and solid particles falling off the system to facilitate rinsing and passivation. The method is to discharge the pickling liquid with nitrogen and clean the entire system with a large amount of water. Continuously rotate and open the guide showers of the system to drain the debris and residual liquid deposited in the short tube. The pH value is measured every 10mm during the flushing process, and the flushing is stopped when the pH value is neutral.