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Bleach Stabilizer Compositions And Methods

Inactive Publication Date: 2014-07-24
BUCKMAN LAB INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a stabilizer composition for stabilizing the bleaching of paper pulp. The composition includes at least one aminocarboxylate, at least one hydroxy acid, and at least one polyamino acid, which are added to the pulp in a specific ratio. The composition is low in magnesium, phosphates, and silicates. The invention also includes a method for stabilizing the bleaching of pulp at an alkaline pH, which involves adding the stabilizer composition and a peroxide to the pulp. The technical effect of the invention is to provide a stable and efficient bleaching process for paper pulp.

Problems solved by technology

Unfortunately, the use of such agents also has serious negative effects on both the paper making process itself and on the environment.
Phosphates can act as fertilizers and contribute to an increase in damaging algal blooms.
However, phosphates are very good stabilizing agents and their removal results in poor bleaching with no obvious replacement.
Satisfactory chelants can be hard to identify and some, for example, nitrilotriacetic acid (NTA) have been listed as carcinogens.

Method used

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Examples

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Effect test

example 1

[0048]This example demonstrates the surprising and unexpected results achieved by the compositions and methods of the present invention. Pulp was obtained from a standard paper mill operating at alkaline conditions and processing softwood, such as Douglass fir and spruce furnishes. The Control was no formulation in the pulp at all. Two comparative formulations and two test formulations were prepared. Comparative formulation 1 contained amino phosphonic acid with a phosphate concentration of 38.4 mg / L, and comparative formulation 2 was a blend of amino phosphonic acid, aminocarboxylate, and a hydroxy acid with a phosphate concentration of 4.5 mg / L. Test formulation 1 contained 65.00 wt % aminocarboxylate, 5.00 wt % polyamino acid, 15.00 wt % water, and 15.00 wt % of a citric acid solution (50 wt % citric acid based on the total weight of the citric acid solution) based on the total weight of test formulation 1. Test formulation 2 contained 65.00 wt. % aminocarboxylate, 15.00 wt % wat...

example 2

[0052]This example further demonstrates the surprising and unexpected results achieved by the compositions and methods of the present invention. Pulp was obtained from a standard paper mill operating at alkaline conditions and processing softwood, such as Douglass fir and spruce furnishes. The Control was no formulation in the pulp at all. Three comparative formulations and one test formulation was prepared. Comparative formulation 1 contained 65.00 wt. % aminocarboxylate, 30.00 wt % water, and 5.00 wt % iminodisuccinate based on the total weight of the formulation. Comparative formulation 2 contained 80.00 wt % water, 15.00 wt % of the citric acid solution (50 wt % citric acid based on the total weight of the citric acid solution), and 5.00% iminodisuccinate based on the total weight of the formulation. Comparative formulation 3 contained 90.00 wt % water, 5.00 wt % iminodisuccinate, and 5.00 wt % polyamino acid based on the total weight of the test formulation. Test formulation 1 ...

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Abstract

Compositions for and methods of stabilizing bleaching and making paper or paperboard having suitable brightness are provided. A stabilizer composition is provided containing aminocarboxylate, hydroxy acid, and either polyamino acid or iminodisuccinate, or both. The stabilizer composition can have low levels or be free of magnesium, phosphates, and silicates. The present invention also relates to a method of stabilizing the bleaching of pulp at an alkaline pH.

Description

[0001]This application claims the benefit under 35 U.S.C. §119(e) of prior U.S. Provisional Patent Application No. 61 / 755,496, filed Jan. 23, 2013, which is incorporated in its entirety by reference herein.BACKGROUND OF THE INVENTION[0002]The present invention relates to the stabilization of paper pulp bleaching. More particularly, this invention relates to compositions containing stabilizing agents and methods of using such compositions in the bleaching of paper pulp to yield superior paper products.[0003]Papermaking generally includes forming an aqueous pulp composition and then sheeting and drying the pulp to form a desired paper product. Hydrogen peroxide is widely used in industrial and domestic applications. Hydrogen peroxide is extensively used, for example, in the production of pulp, such as in the production of recycled pulp, to enhance pulp and paper brightness by bleaching. Various agents such as magnesium salts, phosphates, and sulfates have been used to stabilize hydrog...

Claims

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Application Information

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IPC IPC(8): D21C9/10
CPCD21C9/1026D21C9/1042D21C9/1036D21C9/10
Inventor JENKINS, DONALD G.CARTER, AMY E.
Owner BUCKMAN LAB INT INC