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Enzymatic treatment of paper making pulps

A pulp and alkali treatment technology, applied in textile and papermaking, fiber raw material treatment, etc., can solve problems such as excessive consumption of cationic additives and easy blockage of drainage screen filters

Inactive Publication Date: 2006-05-24
NOVOZYMES AS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the drainage screen and filters are easily blocked
Ultimately, cationic additives are over-consumed due to anionic waste

Method used

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  • Enzymatic treatment of paper making pulps

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] Degradation of pectin with pectate lyase and pectinase

[0123]1 g of polygalacturonic acid sodium salt (Sigma, P3850, minimum purity 85%) was dissolved in 1 L of deionized (DI) water. With NOVOZYM 51019 Pectate lyase, pectinase preparation PECTINEX TM Aliquots of the solution were treated with ULTRA SP-L, and with Pectin ES 3X-L (both available from Novozymes A / S, Krogshoejvej 36, DK-2880 Bagsvaerd, Denmark). The treatment was carried out at pH 7.0 and 55°C for 60 min. Enzyme doses were 40 mg / L each of the three enzyme preparations. After the above treatment, the solution was acidified to pH 2.0 with 8% (w / w) phosphoric acid. The solution was diluted 10 times with DI water, and then the UV spectrum was measured by a UV-Vis photometer.

[0124] Such as figure 1 As shown, pectate lyase treatment resulted in different degradation products compared to the two pectinases, as evidenced by strong UV absorption at 235 nm. Pectinase degrades pectin to galacturonic acid, w...

Embodiment 2

[0125] Example 2: Effect of alkaline-treated pectate lyase on cation requirements

[0126] Thermo-mechanical pulp (TMP) samples were treated with 2% NaOH at 60°C for 1 h. The treated pulp was then filtered through a Brit Jar (200 mesh screen) and washed with 0.1 N H 2 SO 4 The filtrate was neutralized to pH7. With different doses of NOVOZYM TM 51019 Pectate lyase treated the filtrate at 55°C for 2 hrs.

[0127] Cation requirements were determined using a Mütek particle charge detector and an automatic titrator. 1.0ml sample was diluted in 20ml DI water, and polydiallyldimethyl-ammonium chloride (polydiallyldimethyl-ammonium chloride) (poly-DADMAC, available from Aldrich ) to titrate the suspension.

[0128] NOVOZYM TM

Embodiment 3

[0129] Example 3: Enzyme treatment prior to alkaline treatment - effect on cation requirements

[0130] Thermo-mechanical pulp (TMP) samples were treated with different doses of the following enzymes: NOVOZYM TM 51019 Pectate lyase, NOVOZYM TM 51019 Pectate lyase with NOVOSHAPE TM Pectine esterase and pectinase preparation PECTINEX TM A combination of ULTRA SP-L (both available from Novozymes A / S, Krogshoejvej 36, DK-2880 Bagsvaerd, Denmark). The pH of the pulp suspension was adjusted to 7.0 before enzyme treatment. Other enzyme treatment conditions are: 55°C, 4% consistency, 2hr. Then, the pulp samples were treated with 2% NaOH at 60 °C for an additional 1 h. Filter the treated pulp through a Brit Jar (200 companion strainer) and wash with 0.1N H 2 SO 4 The filtrate was neutralized to pH 7.

[0131] Cation requirements were determined using a Mütek particle charge monitor and an automated titrator. A 1.0 ml sample was diluted in 20 ml DI water and the suspension w...

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PUM

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Abstract

The present invention relates to processes for treating pulp, and for preparing paper-based materials such as paper, board, linerboard, corrugated board, tissue, tissue, corrugated boxes, boxes, etc., which processes include alkaline treatment of pulp, cracking with pectin Enzyme and / or pectate lyase treatment and, if necessary, dewatering of the pulp. A combination of pectate lyase and pectin esterase can replace pectin lyase. The present invention also relates to the use of xylanases, pectate lyases, pectate lyases, and / or combinations of pectate lyases and pectinesterases in reducing anion waste and / or reducing the cation requirement of pulp .

Description

technical field [0001] The present invention relates to a process for preparing paper materials, a process for treating pulp, and a pulp washing process, these processes include alkali treatment of pulp, the use of pectin lyase, pectate lyase or pectate lyase and pectin ester A combination of enzymes is used to treat and, if necessary, dewater the pulp. The present invention also relates to the use of these enzymes and / or xylanases for reducing the anionic waste of pulp and / or the cationic requirement of pulp. Background technique [0002] Paper materials such as paper, cardboard, linerboard, corrugated paperboard, tissue, towel, corrugated container or box Made of plant fibers. Pulp is an aqueous mixture of such fibers. Pectin, or homogalacturonan, is a component of plant fibers, that is, plant cell wall polysaccharides having a backbone of α-1,4-linked galacturonic acid monomers, some of which have free carboxylic acid groups The groups are methyl esterified. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00
Inventor 亨里克·伦德汉尼·H·佩德森徐辉罗菁
Owner NOVOZYMES AS
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