US PATENT SUBCLASS 530 / 205
.~ Recovery of tall oil or derivatives from papermaking waste, purification of tall oil, or separation of components of tall oil; or product thereof (e.g., separation of rosin, fatty acids, sterols, etc.; decolorizing, etc.)

Current as of: June, 1999
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530 /   HD   CHEMISTRY: NATURAL RESINS OR DERIVATIVES; PEPTIDES OR PROTEINS; LIGNINS OR REACTION PRODUCTS THEREOF

200  DF  NATURAL RESINS OR DERIVATIVES (E.G., WOOD OR PINE TAR; CATIVO RESIN DERIVATIVES, ETC.) {6}
205.~ Recovery of tall oil or derivatives from papermaking waste, purification of tall oil, or separation of components of tall oil; or product thereof (e.g., separation of rosin, fatty acids, sterols, etc.; decolorizing, etc.) {3}
206  DF  .~.~> Organic sulfur or nitrogen containing material used in the process, or product thereof
207  DF  .~.~> Esterification used in the process, or product thereof
208  DF  .~.~> Inorganic material used in the process, or product thereof (e.g., using sulfuric acid, boric acid, etc.) {1}

DEFINITION

Classification: 530/205

(under subclass 200) Processes wherein: (1) tall oil or a derivative thereof is recovered from papermaking waste; (2) one or more components are separated from tall oil; (3) tall oil is purified; or products of such processes.

(1) Note. Tall oil is a by-product of the wood pulp industry and is usually recovered from pine wood "black liquor" of the sulfate or kraft paper processes. A typical composition of tall oil includes 50-60% fatty acids (e.g., oleic, linoleic, etc.), 34-40% rosin acids, and 5-10% unsaponifiable matter, such as long chain alcohols and sterols.

(2) Note. Some of the products isolated from tall oil include, but are not limited to, tall oil rosin, tall oil fatty acids, tall oil pitch, mixtures of oleic and linoleic acid, etc.

(3) Note. Although "tall oil fatty acids" contain at least 90% of free fatty acids, they are included among natural resins because of a measurable content of rosin acids (up to 10%).

(4) Note. Compositions containing tall oil or its reaction product as an ingredient thereof and having a known utility are classified in the appropriate composition class providing therefor.