Process for improving the drainage capacity of a paper pulp using an enzyme obtained from the fungus Humicola insolens or the bacterium Cellulomonas
First Claim
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1. A process for treating paper pulp, comprising:
- contacting an aqueous suspension of said pulp having a Schopper-Riegler (SR) value of at least 25 determined according to Standard NFQ 50 003 with a cellulase or hemicellulase enzyme or enzyme composition containing a cellulase or hemicellulase enzyme at a pH in the range 7-9, wherein said enzyme or enzyme composition comprises an enzyme obtained from the fungus Humicola insolens or from the bacterium Cellulomonas, and said contacting improves the drainage capacity of said paper pulp.
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Abstract
A process for treating paper pulp using an enzyme composition. An enzyme composition containing cellulases or hemicellulases selected from among those derived from the fungus Humicola insolens and from the bacterium Cellulomonas is made to act upon an aqueous suspesnion of the pulp possessing a given Schopper-Riegler level (SR) according to Standard NFQ 50 003. This procedure is particularly useful for treating a recycled fiber-based paper pulp having a pH of at least 5.
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Citations
18 Claims
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1. A process for treating paper pulp, comprising:
contacting an aqueous suspension of said pulp having a Schopper-Riegler (SR) value of at least 25 determined according to Standard NFQ 50 003 with a cellulase or hemicellulase enzyme or enzyme composition containing a cellulase or hemicellulase enzyme at a pH in the range 7-9, wherein said enzyme or enzyme composition comprises an enzyme obtained from the fungus Humicola insolens or from the bacterium Cellulomonas, and said contacting improves the drainage capacity of said paper pulp. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A process for improving the drainage capacity of a paper pulp composition, comprising:
contacting said paper pulp composition with a cellulase or hemicellulase enzyme or enzyme composition containing a cellulase or hemicellulase at a pH in the range 7-9, wherein said enzyme or enzyme composition comprises an enzyme obtained from the fungus Humicola insolens or from the bacterium Cellulomonas, and said contacting improves the drainage capacity of said paper pulp composition. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
Specification