One of these wastes is dirty caustic, most of which comes from LPG cleaning and kerosene cleaning units, but also from isomerization, hydrocracker and coker units. Sulfidic and phenolic dirty caustic are firstly mixed and stored in the same tank.
In addition, there is always a steady flow of dirty caustic in the refinery that is sent and stored to another unit. Here it is neutralized and H2S and mercaptan are removed from caustic. Subsequently, it is sent directly to the water-treatment unit without being stored.
Within the scope of the project, the scenario of providing dirty caustic as an input to another factory (i.e. a pulp and paper factory) without being cleaned in the treatment unit will be studied. Moreover, Tupras will bring to CORALIS their experience in CO2 conversion projects like COZMOS and MOF4AIR, obtaining in return strategies and business cases for their exploitation in a symbiotic scenario.