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Enzymatic Treatment of Paper Making Pulps

a technology of paper making pulp and enzymes, applied in the field of papermaking pulp processing, can solve the problem that treatment can indeed take place, and achieve the effect of reducing the cationic demand

Inactive Publication Date: 2007-05-31
NOVOZYMES AS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, surprisingly, and contrary to what is stated in the above EP and US patents, the enzyme treatment can indeed take place before the alkaline treatment step.

Method used

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  • Enzymatic Treatment of Paper Making Pulps

Examples

Experimental program
Comparison scheme
Effect test

example 1

Degradation of Pectin with Pectate Lyase and Pectinases

[0105] 1 g of polygalacturonic acid sodium salt (Sigma, P3850, minimum purity 85%) was dissolved in 1 L of de-ionized (DI) water. Aliquots of the solution were treated with NOVOZYM™ 51019 pectate lyase, and the pectinase preparations PECTINEX™ ULTRA SP-L, and PECTINEX™ 3X-L (all commercially available from Novozymes A / S, Krogshoejvej 36, DK-2880 Bagsvaerd, Denmark). The treatment took place for 60 min. at pH 7.0 and 55° C. Enzyme dosage was 40 mg / L of the three enzyme preparations, respectively. After the treatment, the solutions were acidified with 8% (w / w) phosphorous acid to pH 2.0. The solutions were diluted 10 times with DI water, and then the UV spectrum was determined by a UV-Vis spectrometer.

[0106] As shown in FIG. 1, the pectate lyase treatment leads to different degradation products as compared to the two pectinases, as evidenced by the characteristic strong UV absorbance at 235 nm. Pectinases degrade pectin into gal...

example 2

Effect of Pectate Lyase on Cationic Demand after Alkaline Treatment

[0107] A thermo-mechanical pulp (TMP) sample was treated with 2% NaOH at 6000 for 1 h. The treated pulp was then filtered through a Brit Jar (200 mesh screen) and the filtrate was neutralized to pH 7 by 0.1 N H2SO4. The filtrate was treated with different dosages of the NOVOZYM™ 51019 pectate lyase at 55° C. for 2 hrs.

[0108] Cationic demand was determined on all samples using a Mütek particle charge detector and an auto-titrator. 1.0 ml of sample was diluted in 20 ml of DI water and the suspension was titrated with 0.001 N of the cationic retention aid polydiallyldimethylammonium chloride (poly-DADMAC, commercially available from Aldrich).

TABLE 1Effect of Pectate Lyase on CationicDemand after Alkaline TreatmentNOVOZYM ™ 51019Cationic Demand,Pectate Lyasemeq / LSTD% Decrease 0 mg (control)0.6530.0340.0 4 mg / l0.5410.03117.220 mg / l0.4280.00834.540 mg / l0.4400.02332.8

example 3

Enzyme Treatment before Alkaline Treatment—Effect on Cationic Demand

[0109] A thermo-mechanical pulp (TMP) sample was treated with different dosages of the NOVOZYM™ 51019 pectate lyase, combinations thereof with NOVOSHAPE™ pectinesterase, and with the pectinase preparation PECTINEX™ ULTRA SP-L (all commercially available from Novozymes A / S, Krogshoejvej 36, DK-2880 Bagsvaerd, Denmark). The pulp suspension was adjusted to pH 7.0 before the enzyme treatment. The other enzyme treatment conditions were: 55° C., 4% consistency, for 2 hrs. Then, the pulp samples were further treated with 2% NaOH at 60° C. for 1 h. The treated pulp was then filtered through a Brit Jar (200 mesh screen) and the filtrate was neutralized to pH 7 by 0.1 N H2SO4

[0110] Cationic demand was determined on alt samples using a Mütek particle charge detector and an auto-titrator. 1.0 ml of sample was diluted in 20 ml of DI water and the suspension was titrated with 0.001 N of the cationic retention aid polydiallyldim...

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Abstract

The invention relates to processes for treating a pulp, and for making a paper material such as paper, cardboard linerboard, corrugated paperboard, tissue, towels, corrugated containers boxes etc. these processes comprising an alkaline treatment of a pulp, a treatment with a pectin lyase and / or a pectate lyase, and, if desired, a draining of the pulp. Pectate lyase in combination with pectinesterase may be substituted for pectin lyase. The invention also relates to the use of xylanase, pectin lyase, pectate lyase, and / or the combination of pectate lyase with pectinesterase for anionic trash reduction and / or reduction of cationic demand of a paper pulp.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation of U.S. patent application Ser. No. 10 / 817,292 filed on Apr. 2, 2004 and claims the benefit of U.S. Provisional application No. 60 / 463,279, filed Apr. 16, 2003, and 60 / 516,678, filed Oct. 31, 2003 the contents of which are fully incorporated herein by reference.FIELD OF THE INVENTION [0002] The present invention relates to processes for making a paper material, for treating pulp, and to pulp washing processes, these processes comprising an alkaline treatment of a pulp, a treatment with a pectin lyase, a pectate lyase, or a pectate lyase in combination with a pectinesterase, and, if desired, a draining of the pulp. The invention also relates to the use of these enzymes, and / or xylanase for anionic trash reduction and / or reduction of cationic demand of a paper pulp. BACKGROUND OF THE INVENTION [0003] Paper materials such as paper, cardboard, linerboard, corrugated paperboard, tissue, towels, corrugated c...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H17/00C12N9/18C12N9/24C12N9/88D21C5/00
CPCC12N9/18C12N9/88C12Y301/01011C12Y402/02002D21C5/005
Inventor LUND, HENRIKPEDERSEN, HANNE HOESTXU, HUILUO, JING
Owner NOVOZYMES AS
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