Bleaching stage using xylanase with hydrogen peroxide, peracids, or a combination thereof

A technology of xylanase and hydrogen peroxide, applied in the field of bleached pulp

Inactive Publication Date: 2005-06-22
IOGEN BIO PRODUCKTS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent does not suggest simultaneous treatment of pulp with xylanase treatment and peracid treatment

Method used

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  • Bleaching stage using xylanase with hydrogen peroxide, peracids, or a combination thereof
  • Bleaching stage using xylanase with hydrogen peroxide, peracids, or a combination thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0078] Embodiment 1: the mensuration of kappa number

[0079] The Kappa number of pulp was determined using the TAPPI method for determining the Kappa number of pulp (T 236 cm-85) disclosed in TAPPI Test Method 1996-1997 (this test method is incorporated herein by reference). Briefly, the Kappa number is the volume (ml) of 0.1N potassium permanganate consumed by 1 g of dried pulp under the conditions specified in the method. The results were corrected for 50% consumption of the added potassium permanganate.

[0080] The measurement of the Kappa number is performed at a constant temperature of 25°C ± 0.2°C while stirring continuously. However, it is possible to correct for temperature changes as follows.

[0081] The moisture content of pulp was tested according to TAPPI T 210, "Sampling and Testing Wood Pulp Shipments for Moisture", which method is incorporated herein by reference. Briefly, pulp samples were dissolved in about 800 mL of distilled water and s...

Embodiment 2

[0099] Example 2: Standard analytical method for testing xylanase activity

[0100] Xylanase Assay #1

[0101] The endoxylanase assay is specifically designed to measure the activity of endo-1,4-β-D-xylanase. When azoxylan is incubated with xylanase, when ethanol is added to the reaction mixture, the matrix is ​​broken down to produce low molecular weight colored fragments, which remain in solution. High molecular weight substances were removed by centrifugation, and the color of the supernatant was measured. The activity of xylanase in the assay solution was determined with reference to a standard curve.

[0102] Matrix: The matrix was purified (to remove starch and beta glucan). Polysaccharides were stained with Remazolbrilliant Blue R to about 1 dye molecule / 30 sugar residues. Dissolve the powder matrix in water and sodium acetate buffer and adjust the pH to 4.5.

[0103] Analysis method: Dilute xylanase with 0.5M acetate buffer to pH 4.5. 2 mL of the solu...

Embodiment 3

[0107] Embodiment 3: the preparation of chlorine dioxide

[0108] In the laboratory, chlorine dioxide was produced according to the standard method of passing a mixture of chlorine and nitrogen through a series of columns filled with sodium chlorite and collecting the exhaust gas with cold water. Chlorine dioxide is stored frozen in water at a concentration of 10.4 g / L. Additional details on the preparation of chlorine dioxide can be found in Chlorine Dioxide Generation, published by Paprican, Pointe Claire, Quebec, (which is incorporated herein by reference).

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PUM

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Abstract

The present invention discloses a method of bleaching chemical pulp which combines xylanase with hydrogen peroxide, peracid or mixtures thereof. The method comprises the steps of chemical pulping followed by delignification of the resulting pulp, optionally with oxygen, followed by bleaching of the pulp by combining xylanase with hydrogen peroxide, peracid or mixtures thereof. The method enables a pulp mill to use both xylanase and peracid in one bleaching tower, reducing the use of chlorine dioxide and other bleaching chemicals. The pulp bleaching process of the present invention can be used in a pulp mill as part of a complex pulp bleaching process.

Description

technical field [0001] The present invention relates to a method of bleaching pulp. More specifically, the present invention relates to a method of bleaching pulp using xylanase and hydrogen peroxide, peracid, or combinations thereof. Background technique [0002] The production of bleached chemical pulp is a major industry worldwide. More than 50 million tons of bleached pulp are produced annually. Bleached chemical pulp is the main component of all white papers, including papers used for copying, writing and packaging. In addition, bleached chemical pulp is also used to impart strength to some less fine papers such as newsprint. Bleached chemical pulp has a huge market due to its high brightness and cleanliness, brightness stability, high strength and the ease and uniformity of the printing surface it provides. These properties can only be achieved if lignin, which is colored and degrades the interfiber bonds of cellulose, is almost completely remov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C9/10D21C9/14D21C9/153D21C9/16G02B6/36G02B6/38
CPCD21C9/16D21C5/005D21C9/1057D21C9/144D21C9/153G02B6/3897G02B6/4453G02B6/4471
Inventor 杰弗里·托兰米罗·苏黑
Owner IOGEN BIO PRODUCKTS CORP
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