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Pulp composition

a technology of composition and pulp, applied in the field of new pulp composition, can solve the problems of low pulp strength, insufficient reduction of kappa in existing pulping processes, and insufficient strength of arf pulp currently available on the market, and achieve the effect of sufficient strength parameters

Inactive Publication Date: 2014-07-03
CARGILL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is about a method of making pulp for papermaking by cooking a mixture of fibers, water, alkali, and a chemical to enhance delignification. This cooking process results in a pulp with a specific Kappa number and strength parameters that are suitable for papermaking. The technical effect of this patent is to provide a more efficient and selective process for producing high-quality pulp for various paper applications.

Problems solved by technology

Depolymerizing the cellulose weakens the fibers and lowers the strength of the pulp obtained.
Generally, existing pulping processes do not provide pulps having a sufficient reduction in Kappa without the use of multiple delignification processes and / or unacceptable destruction or weakening of the cellulose in the pulp.
But, given the fragile nature of agricultural residues, ARF pulps currently available on the market do not have sufficient strength for many industrial uses, e.g., making printing and writing grade paper.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Cleaning of Raw Fibers

[0071]Bagasse was used as an example of raw fibers. Bagasse was first hydrated for 10 minutes with hot clean water (temperature of water was above room temperature, about 40° C., or 60° C.), under moderate agitation, at a consistency of 0.5% to 2.0%. Pith and sand were separated from the fibers in a Trammel Screen, which was a rotating drum that lifted and dropped the material and accepted water and pith through ⅛th inch holes up to ½″ holes. The rejected material was collected and removed from the screen to prevent accumulation, and disposed. The washing yield was about 80% or higher, or about 85.9%, depending on quality of the bagasse starting material.

example 2

Soda AQ Pulping of Bagasse

[0072]OD bagasse (cleaned as described in Example 1, Kappa number was 89) was treated with sodium hydroxide (20% by weight of the OD bagasse) and AQ (0.3% by weight to the dry weight of OD bagasse) at a liquid to dry fiber ratio of 7 (consistency of about 12.5%), at maximum temperature of about 175° C. for 35 or 40 minutes. Time to the maximum temperature was 60 minutes.

[0073]The target H-factor was 1060, as low as 20, and as high as 3000, and the temperature of the pulping reaction was 120° C. to 185° C. The Kappa number of the obtained pulp was 4.5.

example 3

Washing of Pulp

[0074]A pulp obtained from Example 2 was washed in a pressure diffuser washer designed specifically to accomplish all washing with a single unit without introducing undesired modifications to the pulp. The temperature of the wash water was chosen to cool the pulp temperature to about 100° C., 95° C., 90° C., 85° C., 80° C. or lower. The output went to a bleaching step and was cooled to 100° C. or less to prevent flashing.

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Abstract

One aspect of the invention relates to a pulp composition made from agricultural renewable fibers (ARF) having low Kappa number with unexpected quality sufficient for papermaking (e.g., high strength parameters and high freeness). Another aspect of the invention relates to an ARF pulp having ISO brightness of 60% or higher, and unexpected quality sufficient for papermaking (e.g. high strength parameters and high freeness). Another aspect of the invention relates to a pulp composition made from a pulping process comprising using a high concentration of anthraquinone (AQ). The pulping process can use wood or nonwood fibers (e.g., bagasse and corn stover) to provide pulp having good paper-making quality.

Description

FIELD OF THE INVENTION[0001]The disclosure relates to new pulp compositions and methods of making the same.BACKGROUND[0002]Pulp is a lignocellulosic fibrous material prepared by chemically or mechanically separating cellulose fibers from wood, or non-wood fiber sources.[0003]“Pulping” generally refers to the reduction of a bulk fiber source material into its component fibers. Wood and other plant materials used to make pulp generally contain three main components (apart from water): cellulose fibers (desired for papermaking), lignin (a three-dimensional polymer that binds the cellulose fibers together) and hemicelluloses (shorter branched carbohydrate polymers). The aim of pulping is to break down the bulk structure of the fiber source, be it chips, stems or other plant parts, into the constituent fibers.[0004]Chemical pulping achieves this by degrading the lignin into small, water-soluble molecules which can be washed away from the cellulose and hemicellulose fibers without depolym...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H17/64D21H17/06
CPCD21H17/06D21H17/64D21C9/10D21C3/02D21C3/222D21C5/00D21H11/12D21C3/003D21C3/024D21H17/74D21H21/32
Inventor HAWKINS, BRENT A.MARTIN, FRED
Owner CARGILL INC
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