Method of cooking cellulose material and preserving the heat and terpentine content of the cooking liquor
First Claim
1. A method for producing chemical pulp by cooking cellulosic material containing terpentine comprising feeding said cellulosic material into a storage container so as to produce a bed of said cellulosic material therein, transporting said cellulosic material from said storage container into a digester, cooking said cellulosic material in said digester so as to produce a cooking liquor containing terpentine therein, removing said cooking liquor from said digester, producing expansion steam containing terpentine from said cooking liquor, introducing at least a portion of said expansion steam into the lower portion of said bed of cellulosic material in said storage container so as to transfer a substantial portion of the heat and terpentine contents of said expansion steam to said cellulosic material and produce a heated zone therein, regulating the flow of said expansion steam introduced into said bed of cellulosic material so that said heated zone is maintined below the surface of said bed, and withdrawing uncondensed gases from said storage container countercurrently to the flow of said cellulosic material into said storage container so as to prevent the entry of air contained in said cellulosic material into said storage container.
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Accused Products
Abstract
A method of cooking cellulose material and effectively preserving the heat and terpentine content of the cooking liquor is disclosed. The cooking liquor is allowed to expand and the expansion steam (blow steam) is conveyed into a bed of cellulose material in a storage container (3'"'"', 3) to heat and impregnate the cellulose material before cooking. A heated zone is maintained in the bed of material below the surface of the bed by regulating the flow of expansion steam into the container. Uncondensed, evil-smelling and poisonous gases are at the same time prevented from flowing out into the atmosphere. These gases are drawn off from the storage container for destruction.
23 Citations
18 Claims
- 1. A method for producing chemical pulp by cooking cellulosic material containing terpentine comprising feeding said cellulosic material into a storage container so as to produce a bed of said cellulosic material therein, transporting said cellulosic material from said storage container into a digester, cooking said cellulosic material in said digester so as to produce a cooking liquor containing terpentine therein, removing said cooking liquor from said digester, producing expansion steam containing terpentine from said cooking liquor, introducing at least a portion of said expansion steam into the lower portion of said bed of cellulosic material in said storage container so as to transfer a substantial portion of the heat and terpentine contents of said expansion steam to said cellulosic material and produce a heated zone therein, regulating the flow of said expansion steam introduced into said bed of cellulosic material so that said heated zone is maintined below the surface of said bed, and withdrawing uncondensed gases from said storage container countercurrently to the flow of said cellulosic material into said storage container so as to prevent the entry of air contained in said cellulosic material into said storage container.
Specification