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Method and chemical composition to improve efficiency of mechanical pulp

a mechanical pulp and chemical composition technology, applied in the direction of non-fibrous pulp addition, pulping with inorganic bases, retention agent addition, etc., can solve the problems of reducing the brightness of the resulting paper, reducing the efficiency of mechanical pulp production, and consuming a lot of energy in the mechanical pulping operation. , to achieve the effect of improving the papermaking process and reducing the energy consumption of pulp manufacturing

Inactive Publication Date: 2010-09-09
ECOLAB USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]At least one embodiment of the invention is directed towards a composition and a method of its use. The composition improves the papermaking process. The composition comprises a base, a small quantity of a strong reductive chemical, and a chelating agent. The composition is added to the papermaking process before or during the mechanical pulping of wood chips. The composition decreases the energy consumption in pulp manufacturing but does not induce a net decrease in brightness of paper produced from the paper pulp when compared to paper similarly produced from similar paper pulp that did not have the composition added to its wood chips. The composition can be an aqueous solution or slurry capable of being applied at any stage of the mechanical pulping process, before or during the refining, e.g., in a wood chip washing operation, chip soaking, sprayed over the chips, and may be capable of being added directly into a refiner.

Problems solved by technology

Mechanical pulping operations unfortunately are very energy-intensive and they tend to produce pulps with low strength.
Unfortunately, adding alkali to wood chips also causes a drop in the brightness of the resulting paper.
As a result, papermakers are forced to make an undesirable tradeoff.
They must either choose to reduce energy costs but accept a loss in brightness or they must use additional bleach and sacrifice cost savings.

Method used

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Embodiment Construction

[0010]The following definitions are provided to determine how terms used in this application, and in particular how the claims, are to be construed. The organization of the definitions is for convenience only and is not intended to limit any of the definitions to any particular category.

[0011]“CSF” means Canadian Standard Freeness a described by TAPPI methods and standards and measured in millimeters.

[0012]“Freeness” means the measure of the rate at which a suspension of pulp may be drained, and is typically measured according to the Canadian Standard Freeness test, as defined by TAPPI methods and standards. Changes in freeness can result from both chemical and physical changes in pulp.

[0013]“Mechanical pulping” means a physical change caused by converting pulpwood logs and chips into pulp by the use of mechanical energy.

[0014]“Chemimechanical pulping” means a mild chemical change occurring in a wood grinding or chip refining process. Chemimechanical pulping commonly improves paper ...

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Abstract

The invention provides a composition of matter and a method, which enhance the process of mechanically pulping paper precursors. The composition of matter includes a small quantity of a reducing agent and a source of alkali. When added to the pulped material, e.g., wood chips, before or during mechanical pulping, the composition reduces the energy cost of the operation. In addition, not only does the composition also does not reduce the brightness of pulp, the composition can also enhance the effectiveness of subsequent bleaching processes.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]None.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]Not Applicable.BACKGROUND OF THE INVENTION[0003]This invention relates to improving fiber quality and process efficiency in mechanical pulping. More specifically, the invention relates to using specialty chemical compositions such as combinations of a reductive chemical and a chelant in an alkaline medium to improve the process efficiency and brightness of a paper product produced from a pulp material manufactured in such a process. The invention has particular relevance for decreasing freeness, providing energy and chemical savings, and enhancing brightness of paper products.[0004]Mechanical pulping is a common method to produce pulp. One advantage mechanical pulping has over other pulping methods is that the pulping process does not result in a significant loss of mass. Mechanical pulping operations unfortunately are very energy-intensive and they tend to produce ...

Claims

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Application Information

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IPC IPC(8): D21B1/04D21C9/00D21C3/02D21C3/04D21C3/06D21C3/20
CPCD21B1/021D21B1/04D21C9/163D21C9/1042D21C1/06D21H21/14D21H17/64D21H21/32D21H21/10
Inventor DUGGIRALA, PRASADSHEVCHENKO, SERGEY
Owner ECOLAB USA INC
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