Paper & Pulp
Caustic soda is widely used in the manufacture of wood pulp. The most commonly used process is the 'kraft' or sulfate process, which includes the following steps:
Incoming logs are slashed, debarked and reduced to the size of small chips.
The chips are charged to a digester where they are processed with steam and "white" liquor containing sodium sulfide and caustic soda.
Pulp is separated from the cooking "black" liquor.
Afterwards, the "black" liquor is regenerated to "white" liquor that is re-used in the process.
Caustic soda is also used to neutralise pulp containing bleaching agent that is used for the production of paper with high whiteness.
Product overview
