US3737369A - Alkaline digestion of a mixture of cotton linters and fibrous vegetable material and product thereof - Google Patents

Alkaline digestion of a mixture of cotton linters and fibrous vegetable material and product thereof Download PDF

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Publication number
US3737369A
US3737369A US00234362A US3737369DA US3737369A US 3737369 A US3737369 A US 3737369A US 00234362 A US00234362 A US 00234362A US 3737369D A US3737369D A US 3737369DA US 3737369 A US3737369 A US 3737369A
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United States
Prior art keywords
cotton linters
bagasse
linters
mixture
pulping
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Expired - Lifetime
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US00234362A
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English (en)
Inventor
E Villavicencio
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Process Evaluation and Development Corp
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Process Evaluation and Development Corp
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials

Definitions

  • This invention relates to methods of chemically pulping blends of diverse cellulosic materials.
  • it re lates to a process for pulping blends or mixtures of cotton linters with the fibrous fraction of vegetable materials such as straw, flax, rice hulls, hemp, esparto, bamboo and other like materials, especially depithed sugarcane bagasse.
  • the invention further relates to the resultant pulps and to paper products prepared therefrom.
  • Cotton linters (the staple left on cotton seeds after ginning) have previously been used to prepare paper pulp.
  • the linters which are approximately 90% or more pure cellulose, are normally pulped by mechanical pulping processes using, e.g., Hollander refiners and very small amounts of reactive chemical for oil and wax removal.
  • Pulps have also been prepared by chemical pulping of the fibrous portions of straws, grasses and other like vegetable materials such as depithed sugarcane bagasse. Bagasse and similar vegetable material fibers have a relatively very high hemicellulose content (upwards of 28% by weight of the total lignocellulose material) a substantial proportion of which is retained after a conventional soda process pulping.
  • bagasse pulps hydrate extremely fast and are typically observed to be (1) too easily refined, and (2) intrinsically weaker, especially in regard to tearing strength of paper made therefrom. Because of the very diverse nature of cotton linters and bagasse and like vegetable fibers and the pulping processes conventionally applied to each it has not previously been considered feasible to prepare paper pulps from blends of these materials.
  • blends or mixtures of 2 to weight percent cotton linters and correspondingly 98 to 85 weight percent lignocellulosic fibers of vegetable materials such as sugarcane bagasse may be chemically pulped to produce pulps useful for the manufacture of paper.
  • the amount of linters in the mixture is from about 5 to about 10 weight percent based on total weight.
  • the cotton linters utilized have a maximum fiber length of not more than about 4 to 5 millimeters and a minimum fiber length of not less than about 2 to 2.5 millimeters.
  • pulps including cotton linters fibers longer than the aforesaid maximum, e.g. about 6- rnillimeters cannot be satisfactorily refined; apparently be- 3,737,369 Patented June 5, 1973 cause the linters agglomerate and become mechanically entwined into relatively thick ropes which plug the refiner.
  • the pulping process of this invention is otherwise the same as typical processes used for pulping of vegetable material fibers.
  • the Weight ratio of total lignocellulosic and cellulosic (i.e., cotton linters) materials (dry weight basis), to digestion medium is between about /5 and /3 (e.g., A);
  • the digestion temperature is from about 340 to about 380 Fahrenheit (e.g., 350 Fahrenheit) and the digestion time ranges from about 15 minutes to several hours or more, depending primarily upon the specific lignocellulosic material being pulped.
  • the degestion or cooking time is usually from about 15 to about 40 minutes, preferably 20 to 30 minutes.
  • the pulping process may be combined with a preliminary acid prehydrolysis step in which case alkaline cooking times can be reduced (for example, 5 to 20 minutes, preferably 10 to 15 minutes, for bagasse-linter blends).
  • Any desired alkaline pulping chemicals may be used. Suitable chemicals are described, for example, in Kirk-Othmers Encyclopedia of Chemical Technology, second edition, volume 16 (1968), beginning at page 702.
  • the invention has been specifically demonstrated for pulping of mixtures of cotton linters and sugarcane bagasse. However, it is not limited to bagasse as the lignocellulosic feed material, but is applicable as Well to mixtures of cotton linters and fibers of vegetable materials such as bamboo, various straws, hemp, sisal and the like.
  • bagasse fibers used should be as pith-free as is reasonably possible.
  • Suitable bagasse fiber feed materials may be prepared, for example, via the use of the apparatus and/or methods described in US. Pat. 3,537,142, issued Nov. 3, 1970 or in my prior copending US. Application Ser. No. 54,580, filed July 13, 1970 and now US. Pat. 3,688,345.
  • the bagasse fiber feed material be one which has been subjected to a two-stage depithing operation, i.e., first dry depithed in accordance with the aforesaid US. Pat.
  • the blend or mixture of cotton linters and the lignocellulosic fibers of vegetable material may be prepared in any suitable manner and at any suitable time prior to commencement of the alkaline digestion.
  • the blend is formed by adding a water slurry containing the appropriate desired amount of linters to the above described second stage wet depithing operation on the bagasse fibers;
  • pulp was prepared from the same sugarcane 5 bagasse fibrous material alone, and from the cotton linters alone, in the same manner as described above and prop erties of sample papers made from these pulps were also thus, in eifect, forming the blend in the wet depither. In this way it is possible to remove some of the greases and oils in and on the cotton linters as received and thereby improve the xylosan transfer from the bagasse to the linters in the subsequent alkaline digestion.
  • the total Na O content of the digestion liquor is about 12 weight percent.
  • the strength of the paper samples is the tensile breaking length, in meters, determined on an Instron tensile tester with a specimen l-inch wide, 4-inches long (between test 20 jaws) and at a jaw separation rate of l-inch per 111
  • the lignocellulosic material to be pulped was depithed sugarcane bagasse prepared in the apparatus and with the method described (cooks) were conducted at a ratio of about 4 parts by weight cooking liquor for each part by weight (dry weight basis) of the mixture of cotton linters and bagasse fibers 30 or of these individual materials above in the comparative runs.
  • the digestions were each performed for 30 minutes in a closed vessel at a steam pressure of to pounds per square inch gauge. After blowdown from the digester the pulps were cleaned, centrifuged in Pulp from comparamaa Pulp from Example:
  • the method of this invention provides a practical procedure for pulping a blend of diverse materials to yield pulps having a good combination of properties compared to pulps prepared from vegetable material fibers alone, e.g., bagasse fibers.
  • the beating times to equivalent Canadian Standard Freeness are greater than in Comparative Run A and tear strengths are increased.
  • the overall physical properties of papers prepared from the pulps of all examples, especially Example 2 are good to excellent.
  • Method for the production of pulp comprising digesting a mixture of 2 to 15 weight percent cotton linters having a fiber length of about 2 to about 5 millimeters and 98 to 85 weight percent fibrous vegetable material with an aqueous alkaline digestion solution and recovering the resultant cellulosic pulp.
  • Method of claim 3 in which the digestion is conducted at steam gauge pressures of from about to about pounds per square inch for a period of from about 15 to about 40 minutes using a 12 percent aqueous solution of sodium hydroxide as the digestion solution.

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US00234362A 1972-03-13 1972-03-13 Alkaline digestion of a mixture of cotton linters and fibrous vegetable material and product thereof Expired - Lifetime US3737369A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US23436272A 1972-03-13 1972-03-13

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US3737369A true US3737369A (en) 1973-06-05

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US00234362A Expired - Lifetime US3737369A (en) 1972-03-13 1972-03-13 Alkaline digestion of a mixture of cotton linters and fibrous vegetable material and product thereof

Country Status (11)

Country Link
US (1) US3737369A (enrdf_load_stackoverflow)
JP (1) JPS49501A (enrdf_load_stackoverflow)
AR (1) AR202621A1 (enrdf_load_stackoverflow)
AU (1) AU469545B2 (enrdf_load_stackoverflow)
BR (1) BR7208466D0 (enrdf_load_stackoverflow)
EG (1) EG10799A (enrdf_load_stackoverflow)
ES (1) ES409498A1 (enrdf_load_stackoverflow)
FR (1) FR2175745B1 (enrdf_load_stackoverflow)
GB (1) GB1387358A (enrdf_load_stackoverflow)
OA (1) OA04343A (enrdf_load_stackoverflow)
PH (1) PH9377A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999045204A1 (en) * 1998-03-02 1999-09-10 Purely Cotton Inc. Cotton linter tissue products and method for preparing same
RU2207416C1 (ru) * 2002-05-18 2003-06-27 Федеральное государственное унитарное предприятие "Пермский завод им. С.М. Кирова" Способ получения хлопковой целлюлозы
WO2007123974A3 (en) * 2006-04-21 2007-12-21 Hercules Inc Decolorized raw cotton linters and preparation of ether derivatives therefrom
CN107100028A (zh) * 2017-05-05 2017-08-29 东至县鸿棉工贸有限责任公司 一种精制棉短绒的生产方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5019974A (enrdf_load_stackoverflow) * 1973-06-29 1975-03-03
JPS5218870A (en) * 1975-07-16 1977-02-12 Chisso Corp Laver screen having different adhering property on both side
GB2118223A (en) * 1982-03-23 1983-10-26 Mahindra Kumar Makhija Pulp manufacture
GB2125080A (en) * 1982-08-06 1984-02-29 Kimberly Clark Co Modifying bagasse pulp
EP3171034B1 (en) 2012-11-09 2020-10-07 Johnson Controls Technology Company Variable geometry diffuser having extended travel

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999045204A1 (en) * 1998-03-02 1999-09-10 Purely Cotton Inc. Cotton linter tissue products and method for preparing same
RU2207416C1 (ru) * 2002-05-18 2003-06-27 Федеральное государственное унитарное предприятие "Пермский завод им. С.М. Кирова" Способ получения хлопковой целлюлозы
WO2007123974A3 (en) * 2006-04-21 2007-12-21 Hercules Inc Decolorized raw cotton linters and preparation of ether derivatives therefrom
CN107100028A (zh) * 2017-05-05 2017-08-29 东至县鸿棉工贸有限责任公司 一种精制棉短绒的生产方法

Also Published As

Publication number Publication date
AU469545B2 (en) 1976-02-19
FR2175745A1 (enrdf_load_stackoverflow) 1973-10-26
FR2175745B1 (enrdf_load_stackoverflow) 1975-10-31
PH9377A (en) 1975-10-22
OA04343A (fr) 1980-01-31
JPS49501A (enrdf_load_stackoverflow) 1974-01-07
AR202621A1 (es) 1975-06-30
AU4887972A (en) 1974-05-16
ES409498A1 (es) 1976-04-01
GB1387358A (en) 1975-03-19
EG10799A (en) 1976-06-30
BR7208466D0 (pt) 1973-12-11

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