Uso of Cyclodextrin for Reducing Yellowing of Pulp and Paper

a technology of cyclodextrin and pulp, which is applied in the direction of cellulose treatment using microorganisms/enzymes, non-fibrous pulp addition, microorganism/enzyme addition, etc., can solve the problems of undesirable chromophore precursors, and achieve the effect of reducing or preventing yellowing/brightness reversion of pulp

Inactive Publication Date: 2008-02-21
NOVOZYMES NORTH AMERICA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] The present invention therefore relates to a method for reducing or preventing yellowing / brightness reversion of pulp and paper during conditions associated with conventional use (e.g. storage, shipping, paper production, archiving, etc.) comprising entrapping the chromophore precursors present in the pulp within cyclodextrin rings and removing the resulting inclusion complex, such as, during conventional washing by adding or generating the cyclodextrin before or during washing.
[0006] The aspect of the present invention therefore relates to a method for reducing yellowing / brightness reversion of pulp and paper comprising direct addition of cyclodextrin to the pulp or in situ generation of cyclodextrin followed by a subsequent washing step to remove the formed cyclodextrin inclusion complexes.

Problems solved by technology

It has now been found that undesirable chromophore precursors, entrapped within cyclodextrin complexes, can be removed during the washing stage of pulp formation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Improved Thermo Stability of Bleached Eucalypt Kraft Pulp (BEKP) by Addition of Alpha-Cyclodextrin

Procedure:

[0046] 1. (6) 1.2 L, stainless steel Launder-Ometer beakers (The Launder-Ometer (Atlas Electric Devices Company, Chicago, Ill., USA) is a standard piece of equipment used in the textile industry that spins the beakers, end-over-end, within a pre-heated, water-filled chamber) containing 400 g of 5% w / w consistency BEKP were prepared (the initial pH of the pulp was not adjusted prior to cyclodextrin application).

PulpLOMConsistencyTempTimeBEAKERID / dose(w / w %)(° C.)(min)pHpre1Control5551204.120.01 w / w %5551204.1alpha-cyclodextrin3 1.0 w / w %5551204.1alpha-cyclodextrin[0047] 2. alpha-cyclodextrin was aliquoted to each beaker according to the chart above to achieve the desired final concentrations. [0048] 3. The beakers were then incubated under constant agitation in the Launder-Ometer for 120 minutes at 55° C. [0049] 4. After incubation, the beaker contents were pH'd and then d...

example 2

Removal of Fatty Acids from Solution by Alpha-Cyclodextrin

[0058] Removal of fatty acids from solutions by addition of alpha-cyclodextrin was tested by removal of linoleic acid. Linoleic acid is the most abundant fatty acid in wood extractives and constitutes a potential chromophore. A 0.1% linoleic acid suspension and a 1.0% alpha-cyclodextrin solution was prepared as follows:

1. 250 microliters linoleic acid was transferred to a 250 ml volumetric flask.

2. Deionized water was slowly added while agitating on a whiny mixer.

3. Linoleic acid solution stays suspended as long as agitation is continued.

[0059] A 1.0% alpha-cyclodextrin solution was prepared by dissolving 2 g of alpha-cyclodextrinin 200 ml deionized water.

[0060] The 0.1% linoleic acid suspension was mixed with the 1.0% cyclodextrin solution at different ratios of fatty acid to cyclodextrin and the increase in turbidity was determined. The results are given in the Table 2 below.

TABLE 2Turbidity (NTU, Nephelometric T...

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Abstract

The present invention relates the problem of color formation during paper production resulting in yellowing / brightness reversion of the pulp or the paper. This yellowing / brightness reversion can be reduced by the method of the present invention, which method relates to reducing yellowing of pulp and paper comprising adding or generating cyclodextrin to the pulp before or during washing.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method for preventing or reducing yellowing / brightness reversion of paper and pulps. BACKGROUND OF THE INVENTION [0002] Paper production involves, as a first step, the formation of pulp from wood. In a conventional kraft pulping procedure, raw or pre-treated wood chips are “cooked” under high pressure and temperature in the presence of alkali and sulfide to dissolve the polymeric lignaceous material between the individual wood fibers. The liberated fibers still contain significant amounts of the colored lignaceous material within the fiber wall that can be removed to varying degrees via a spectrum of conventional bleaching operations / chemistries. Contingent upon the wood species, the pulping conditions and the bleaching method, the bleached wood fiber may contain various amounts of residual lignin and extractives (e.g. resin acids, fatty acids, triglycerides, terpenes, terpenoids, waxes, etc.). Paper and pulps prepared...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H17/28D21C5/02
CPCD21C5/005D21C9/005D21H21/143D21H17/005D21H17/24D21C9/02
Inventor DELOZIER, GREGBLOOMFIELD, KIMLUO, JINGXU, HUI
Owner NOVOZYMES NORTH AMERICA INC
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