material used

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Table 1 provides an overview of commonly used materials for storing liquid reagents. In particular, the following points need to be noted:

  • plastics (PVC and polyethylene in particular) are routinely used for corrosive liquid storage;
  • reinforced polyester is eminently suitable for silos used to store lime or other powdered products because of its total stability and also its smooth properties that promote product flow.
  • on grounds of its price and mechanical properties, carbon steel is used for large capacity tanks containing:
    • sodium hydroxide at less than 47% and below 50°C;
    • concentrated sulphuric acid (at least 92%) providing there is absolutely no trace of humidity (vent must be protected by a desiccant);
  • the use of steel (even stainless steel) is prohibited if in contact with normal chlorinated reagents (ferric chloride, hypochlorites, hydrochloric acid and chlorine gas in the presence of humidity).
storing reagentsSecured image
Table 1. Scope of the various items of equipment used for storing reagents