Cooking liquor, or liquors, is an essential part of the pulp manufacturing process, where various types of liquor are used to separate cellulose fibers from other components in the wood, such as lignin and extractives. There are several types of liquors used in pulp mills, including white liquor, green liquor, and black liquor.
White Liquor: White liquor is an alkaline solution used to break down wood chips and dissolve lignin during the cooking process. The most common chemical used in white liquor is sodium hydroxide (NaOH) or sodium sulfide (Na2S). By cooking the wood chips in white liquor, the wood fibers become soft, and the lignin dissolves, allowing for the separation of cellulose from other wood components.
Green Liquor: Green liquor is also an alkaline solution used in the cooking process to break down wood fibers and dissolve lignin. The primary difference compared to white liquor is that the primary chemical used is sodium hydroxide (NaOH). Like white liquor, green liquor helps separate cellulose from other wood components and facilitates the production of pulp.
Black Liquor: Black liquor is the solution remaining after cooking the wood chips in white or green liquor. It contains the spent cooking chemicals and dissolved lignin from the wood. Black liquor is often recycled and used to generate energy through combustion or to recover chemicals for use in other parts of the pulp manufacturing process.
Liquoring is a critical part of the pulp manufacturing process as it enables the separation of cellulose from other wood components and is crucial for producing high-quality pulp. By using different types of liquors, pulp mills can effectively break down wood fibers and produce clean and sustainable pulp.
In order to make detailed evaluations of various sub-processes in the chemical recovery, analyzes of the content / composition of liquors in different positions are needed. We have several analyzes for each type of lye that can be performed to assist in the evaluations. Please contact us for guidance and information.
Green liquor sludge, lime gravel and lime
Contact:
Christina Wedin, +4670 544 93 99, E-mail