What Is Tall Oil?

Tall oil is a transliteration of Tall Oil. Tall oil, also known as liquid rosin, is made from the black solution remaining in the wood pulp produced by the alkali method (mainly the sulfate method).

Tall oil

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Tall oil is a transliteration of Tall Oil. Tall oil, also known as liquid rosin, is made from the black solution remaining in the wood pulp produced by the alkali method (mainly the sulfate method).

Chinese name

Tall oil

English name

Tall Oil

nickname

Tar oil

Chemical formula

R-COOH

Also known as

Liquid Rosin

When pine wood is sliced and pressure-cooked with sodium hydroxide and sodium sulfide, wood cell membranes and rosinic acid in the cells and fatty acid esters in the wood are hydrolyzed and saponified into sodium salts and dissolved in water. Soluble matter and insoluble cellulose are separated into pulp, and a by-product pulp waste liquid is obtained. The pulp waste liquid is left to stand and layered. The lower black liquor mainly contains lignin, and the upper layer is mainly composed of sodium fatty acid soap and sodium rosinate soap. The upper float is scraped to obtain the crude Thor soap (also called crude sulfate). soap). The content of the active ingredients of the crude Thor soap is too low, contains a lot of water, and contains lignin. The crude Thor soap is used as a raw material for the extraction of tall oil. The crude tall soap is washed, acidified and refined. The upper layer is Crude tall oil, the middle layer is mainly lignin, the lower layer is water inorganic salt, etc., separating the upper layer to obtain crude tall oil. Tall oil is mainly used in soaps, varnishes, paints, inks, lubricants, oils, disinfectants or adhesives for metal processing. The main ingredients are fatty acids and abietic acid, which are mixtures.

Tall oil is used in emulsions and microemulsions in metalworking fluids. As an auxiliary emulsifier, the amount of main emulsifier can be reduced. Compared with commonly used oleic acid, it has faster emulsification speed, superior lubricity, good cleaning effect and has certain Anti-foaming effect, wide range of adaptation to hard water, good resistance to rancidity.

Crude tall oil is a by-product recovered from pulp waste liquor in a pulp mill using pine wood as a raw material. Crude tall oil can be separated by distillation under reduced pressure, which is also called distilled tall oil. It consists of a large amount of abietic acid (typically 50% to 60%) and a small amount of fatty acids (typically 30% to 40%). Abietic acid is a diterpene carboxylic acid, and fatty acids are mainly composed of oleic acid and linoleic acid. Therefore, tall oil can be represented by the general formula R-COOH, where R represents the phenanthrene ring portion of abietic acid or (CH2) 7CH = CH (CH2) 7CH3 in oleic acid]