Tall oil

Tall oil, also known as liquid rosin or tallol, is a viscous yellow-black odorous liquid obtained as a by-product of the Kraft process of converting wood into wood pulp which consists of almost pure cellulose fibers.

Composition

Tall oil is a complex mixture of fatty acids, rosin acids, and other substances. It consists of three major components: rosin acids (40-60%), fatty acids (40-50%), and unsaponifiables (10-20%). The exact composition can vary depending on the type of wood used in the Kraft process.

Production

Tall oil is produced as a by-product of the Kraft process. During this process, wood chips are cooked in a solution of sodium hydroxide and sodium sulfide to remove lignin and other substances. The resulting black liquor contains, among other things, the precursors of tall oil. By acidulating the black liquor with sulfuric acid, crude tall oil is precipitated and can be separated by skimming off the surface.

Uses

Tall oil is used in various industries due to its versatile properties. It is used as a component in ink, rubber, adhesive, and paint. In the chemical industry, it is used as a source of fatty and rosin acids. In the energy sector, tall oil is used as a biofuel, particularly in the Nordic countries. It is also used in the production of biodiesel.

Environmental Impact

Tall oil is considered a renewable resource as it is derived from trees, which can be replanted. Its use as a biofuel can help to reduce greenhouse gas emissions compared to fossil fuels. However, the extraction and processing of tall oil can have environmental impacts, including water pollution and habitat destruction.

See Also

• Kraft process
• Biofuel
• Biodiesel
• Fatty acid
• Rosin acid

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