Process for producing extractive-material-reduced cellulose

Details Process for producing extractive-material-reduced cellulose Process for producing extractive-material-reduced cellulose

1987-10-01

1989-03-21

Kight, John

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

536 57, C08B 102, C08B 1600

Patent

active

048144401

ABSTRACT:
The invention relates to a process for obtaining extractive-material-reduced cellulose with a low LAL reaction, wherein cotton linters or wood pulps, subsequent to the customary digesting treatment, are subjected for 1 to 10 hours to hydraulic washing with water, lye with a concentration of less than 5 g/l alkali content, or with a diluted acid containing less than 5 g/l acid at temperatures of 120.degree. to 180.degree. C. and under a pressure of 2 to 20 bar.
The resulting cellulose is used for the manufacture of hemodialysis and/or hemofiltration membranes in the form of flat membranes, tubular membranes or hollow filaments by regeneration of a cellulose solution containing the extractive-material-reduced cellulose with a low LAL reaction.
The regeneration may be effected from solutions of cellulose cuoxam, cellulose xanthate, or solutions of cellulose in tertiary amine oxide or in an LiCl-containing solvent.

REFERENCES:
patent: 4673506 (1987-06-01), Henne et al.
"Der Papier-Fabrikant", 1937, Heft 1/2, pp. 2-5.
"Chemische Technologie Der Zellstoff-Und Papierherstellung", VEB Fachbuchverlag Leipzig, 1967, pp. 425-428.
"Role of Dialyzer Contaminants in the Allergic Epiphenomena of Hemodialysis", Ward et al., Artificial Organs, 8, pp. 338-345.
"Hollow-Fiber Dialyzers and Their Pyrogenicity Testing by Limulus Amebocyte Lysata", Henne et al., Artificial Organs, 8, pp. 299-305.
"Comparison of Chemical Analyses of Hollow-Fiber Dialyzer Extracts", Pearson et al., Artificial Organs, 8, pp. 291-298.

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