kraft process

Synonyms

kraft pulping, sulfate process

Definition

The kraft process (also known as kraft pulping or sulfate process) is a process for conversion of wood into wood pulp consisting of almost pure cellulose fibers. It entails treatment of wood chips with a mixture of sodium hydroxide and sodium sulfide, known as white liquor, that breaks the bonds that link lignin to the cellulose. The waste of this process is known as black liquor.

Broader terms

paper production