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Reduction of furfural content in polyacrylic acid crosslinked cellulose fibers

A technology of cellulose fiber and polyacrylic acid, which is applied in the direction of cellulose pulp post-treatment, cellulose pulp post-treatment modification, fiber treatment, etc., which can solve the problems of expensive and harsh environment

Active Publication Date: 2020-03-10
WEYERHAEUSER NR CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, bleaching, especially with chlorine-containing reagents, can be environmentally harsh, expensive, and a source of manufacturing bottlenecks

Method used

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  • Reduction of furfural content in polyacrylic acid crosslinked cellulose fibers
  • Reduction of furfural content in polyacrylic acid crosslinked cellulose fibers
  • Reduction of furfural content in polyacrylic acid crosslinked cellulose fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Samples of polyacrylic acid crosslinked cellulose fibers were prepared on a laboratory scale by treating southern pine kraft pulp fibers (CF416, Weilhauser) with polyacrylic acid (Aquaset 1676, Dow). All samples were treated with a standard crosslinking solution and cured at 193°C (380°F) for 5 minutes. The cured fibers were treated with distilled water (as a control) or bleaching agent hydrogen peroxide (H 2 o 2 ) of water to re-moisten. The pH of distilled water is 4.46, the corresponding H 2 o 2 The pH of the solutions were 4.93, 4.72, 4.80 and 4.65.

[0055] The following procedure using GC-FID equipment was used to measure the amount of furfural generated in polyacrylic acid crosslinked cellulose fibers and its reduction after application of a bleaching agent, hydrogen peroxide.

[0056] A 1 gram sample of pulp was inserted into a 20ml vial, capped, and heated at 85°C for 10 minutes in a headspace sampler (HP 7694). Volatile compounds are driven from the pulp...

Embodiment 2

[0064] Samples of polyacrylic acid crosslinked cellulose fibers were prepared on a laboratory scale following the procedure described in Example 1 . However, after treatment with the crosslinking solution, the samples were cured at 193°C (380°F) for 10 minutes in order to increase the initial furfural level resulting from curing. The cured fibers were treated with water (control) or bleach hydrogen peroxide (H 2 o 2 ) of water to re-moisten. some cured fibers with H 2 o 2 (concentrations of 2.5 and 5.0 lbs / ADMT (1.13 and 2.27kg / ADMT) fibers) and sodium hydroxide (NaOH) (concentrations of 2.5 or 5.0 lbs / ADMT (1.13 or 2.27kg / ADMT) fibers) for treatment.

[0065] The treated furfural levels of the samples determined by the GC-FID procedure described in Example 1 are shown in Table 2 below.

[0066] Table 2

[0067]

[0068] Likewise, compared to the untreated control sample (2A), the Day 1 values ​​for the furfural content of the treated samples generally decreased with ...

Embodiment 3

[0072] Plant trials were conducted to apply various levels of hydrogen peroxide to polyacrylic acid crosslinked cellulose fibers produced at the Columbus Modified Fiber Plant of Weilhauser Corporation in Columbus, MS. The polyacrylic acid crosslinked fibers were produced from southern pine kraft fibers (CF416, Weilhauser). Bleach hydrogen peroxide (H 2 o 2 ) of water, the solidified fibers were re-wetted by spraying the solution into the air stream containing the solidified fibers.

[0073] The polyacrylic acid crosslinked cellulose fibers were cured in a curing oven at a temperature of about 182°C (360°F) for about 4.5-5 minutes.

[0074] The treated furfural levels of the samples determined by the GC-FID procedure described in Example 1 are shown in Table 3 below.

[0075] table 3

[0076]

[0077] Consistent with Examples 1 and 2, the day 1 value of the furfural content of the treated sample increased with increasing amount of hydrogen peroxide applied in the plant t...

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Abstract

Disclosed are bleached polyacrylic acid crosslinked cellulose fibers having reduced furfural content. The reduced furfural content is accompanied by a strong reduction in malodor associated with crosslinked fibres. Methods to reduce furfural include treating polyacrylic acid-crosslinked cellulose fibers with hydrogen peroxide in the absence of alkaline agents or other bleaching agents after curing. Certain embodiments of the treated polyacrylic acid crosslinked cellulose fibers have a furfural content of less than 1.3 ppm. In certain embodiments, the furfural content of the treated crosslinked fibers is reduced by at least 55% compared to untreated crosslinked fibers. In certain embodiments, as the treated crosslinked fibers age, the furfural content decreases.

Description

[0001] cross reference [0002] This application is entitled to and claims U.S. Nonprovisional Patent Application Serial No. 14 / , entitled "REDUCED FURFURAL CONTENT IN POLYACRYLIC ACID CROSSLINKED CELLULOSEFIBERS," filed May 6, 2014. 271,146, the contents of which are incorporated herein by reference. technical field [0003] The present disclosure relates to polyacrylic acid crosslinked cellulosic fibers, and in particular to the reduction of furfural and attendant malodor produced during the curing stage of the crosslinking process. Background technique [0004] Cellulose fibers are an essential component of absorbent products such as diapers. These fibers form the liquid-absorbent structure, which is a key element of absorbent products. Cellulosic fibers in the form of cellulose fluff pulp are suitable fibers for this application due to the high void volume or high bulk liquid-absorbent fibrous structure provided. However, such structures tend to collapse during wettin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/16D06M11/50D21H11/20
CPCD21C9/163D21C9/005D21H17/38B01J20/26
Inventor 安吉尔·斯托亚诺夫约尔格·恩德雷斯霍尔格·伯鲁达路德维希·巴萨姆
Owner WEYERHAEUSER NR CO