D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/27
D21C 1/00 (2006.01) D21C 1/04 (2006.01) D21C 3/22 (2006.01) D21C 3/26 (2006.01)
Patent
CA 2036311
A PROCESS FOR PRODUCING PULP FROM A LIGNOCELLULOSIC-CONTAINING MATERIAL ABSTRACT This invention provides a process for producing pulp from a lignocellulosic-containing material. According to one aspect of the invention, there is provided a process for reducing the lignin content (as expressed by the Kappa number) of unbleached pulp intended for dissolving grade pu1p manufacture, the process including the step of applying an alkali extraction step to the pulp. According to another aspect of the present invention, there is provided a process for producing dissolving grade pulp, the process including the following steps: a pre-hydrolysing step; a step of dissolving the lignin contained in the pre-hydrolysed material; and carrying out an alkali extraction step. The alkali extraction step may include using about 2% to 5%, preferablyabout 3%, alkali by mass of pulp; at a temperature of about 50°C to 100°C, preferably about 70°C to 80°C; for a period sufficient to give optimal lignin removal. The alkali used is preferably sodium hydroxide. According to a further aspect of the present invention, there is provided a dissolving grade pulp when produced by a process described above.
Bull Housser & Tupper Llp
Sappi Limited
LandOfFree
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