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Method for bleaching wood fibers

Inactive Publication Date: 2006-04-20
HUANG QIANG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0004] The problem addressed by this invention is to find a safer and more

Problems solved by technology

However, there are hazards associated with handling these reductive agents, alone and / or in combination with peroxide.

Method used

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Examples

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examples

[0021] Table 1 shows the results of a comparison between (PMX)-P (pre-mix followed by peroxide bleaching) and FAS-P processes on a mixed office waste furnish from mill 1. Pre-mix solution was generated using a (bisulfite-NaOH) to borohydride molar ratio of 8.9:1. Reductive pretreatments were conducted at various amounts of Pre-mix and FAS, followed immediately after thorough mixing of PMX or FAS into the pulp (ca. 1 minute) by peroxide addition to the pre-treated pulp. Bleaching conditions are listed in Table 1. It is clear from the table that PMX-P process performed significantly better than FAS-P process. Table 2 shows the results of a comparison among (PMX)-P, FAS-P, and Y-P processes on a recycled fiber furnish from mill 2. Bleaching was conducted in the same way as for mill 1 pulp. Bleaching conditions can be seen in Table 2. The results on this pulp also demonstrate that (PMX)-P process performs significantly better than FAS-P and Y-P processes.

TABLE 1Laboratory bleaching re...

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Abstract

A method for bleaching wood fibers with a mixture of sodium borohydride and sodium bisulfite followed by peroxide bleaching in the same vessel.

Description

CROSS REFERENCE TO RELATED PATENT APPLICATIONS [0001] This is a non-provisional application of prior pending U.S. Provisional Application Ser. No. 60 / 619,154 filed on Oct. 15, 2004.BACKGROUND [0002] This invention relates generally to a method for bleaching wood fibers with mixture of sodium borohydride and sodium bisulfite followed by peroxide bleaching. [0003] Combinations of reductive and oxidative bleaching have been used to bleach wood fibers. For example, WO 01 / 59205 discloses a method for bleaching mechanical and chemithermomechanical pulp by pre-bleaching the pulp with a reductive bleaching agent, followed by peroxide bleaching reinforced with borohydride. The reductive agents mentioned in this reference are hydrosulfite, borohydride, hydrazine and formamidine sulfinic acid (FAS). However, there are hazards associated with handling these reductive agents, alone and / or in combination with peroxide. [0004] The problem addressed by this invention is to find a safer and more eff...

Claims

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Application Information

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IPC IPC(8): D21C3/00D21C3/04D21C3/02
CPCD21C9/1084D21C9/163
Inventor HUANG, QIANGGODA, RANGANAMMARCROWLEY, THOMAS ROBERT
Owner HUANG QIANG
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