GAS APPLICATION

The sulphuric acid used as a neutralising agent during tall oil production can be partially replaced by CO₂. By adding CO₂, the tall soap is adjusted to a neutral pH and the NaHCO₃ liquor separated, which can then be fed to chemical recovery. In a further step, acidification and boiling with sulphuric acid (H₂SO₄) is performed. About 50 % of the H₂SO4 can be replaced by CO₂.

Possible advantages of using this technology:

• Lower sulphate emissions
• Improved control of the Na/S ratio in chemical recovery cycle
• Savings in H₂SO₄ and NaOH

MESSER SOLUTION 

As hardware for the feed and dissolution of carbon dioxide, especially in highly viscous mixtures, especially designed nozzles must be used whose tendency to clog is as low as possible.