US2920010A - Manufacture of wood pulp - Google Patents

Manufacture of wood pulp Download PDF

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Publication number
US2920010A
US2920010A US693001A US69300157A US2920010A US 2920010 A US2920010 A US 2920010A US 693001 A US693001 A US 693001A US 69300157 A US69300157 A US 69300157A US 2920010 A US2920010 A US 2920010A
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United States
Prior art keywords
wood
cooking
pulp
sodium
manufacture
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Expired - Lifetime
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US693001A
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English (en)
Inventor
Voiret Eugene Gilbert
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Individual
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Individual
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Publication of US2920010A publication Critical patent/US2920010A/en
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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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/222—Use of compounds accelerating the pulping processes

Definitions

  • An object of this invention is to provide a process which will permit of obtaining from wood from deciduous trees, even in the form of a non-homogeneous mixture, a pulp suitable for the manufacture of printing paper, newsprint and the like, which pulp should fulfill the following conditions:
  • the cooking liquor comprises sodium hydrosulphite and oxalate ions (preferably in the form of sodium oxalate).
  • the hydrosulphite reduces some of the coloured constituents of the wood which are thus rendered water soluble and eliminated, whereby the whiteness of the pulp finally obtained is improved.
  • the oxalate ions inhibit the tannic substances which are always present in wood from deciduous trees and which react with traces of heavy metals contained in the wood to yield products of substantially black colour.
  • the oxalate ions also partially reduce or inhibit the metallic salts of the wood.
  • the wood material to be treated is preferably impregnated with the cooking liquor beforethe cooking operation, the concentration of the impregnating liquor being such that the wood may retain in its mass atv least the whole quantity of reagents required for itsown treatment.
  • the cooking bath mainly serves as a heating fluid and it is therefore possible, to effect the cooking operation by means of a relatively diluted solution (as for instance three to six times more diluted than the impregnating liquor).
  • This cooking solution may have the same composition as the impregnating liquor, but it is also possible to use a solution only containing sodium sulphite; the sodium hydrosulphite and the oxalate ions of the impregnating liquor retained Withimthe wood chips being sufiicient for effecting proper-treatment of the material.
  • the cooking treatment of the impregnated wood material may be effected by means of steam, without any kind of liquid.
  • the cooking liquor is only constituted by the impregnating liquor retained in the wood chips and of course the concentration of this liquor should be such that the quantity of reagents thus present in the wood material be substantially in excess of the exact quantity required for avoiding any possible insufficient treatment of'the wood particles.
  • the duration of the cooking operation is preferably limited to two hours at a temperature of C., or to half an hour at a temperature of to C.
  • the cooking liquor is preferably alkaline at the beginning of the cooking operation (pH between 8 and 10) and slightly acid or neutral at the end thereof (pH between 5 and 7).
  • the pulp thus prepared is strong but papers manufactured therefrom are relatively hard and impermeable. With a final pH in the vicinity of 5, the paper is softer and more permeable. It is thus possible to modify at will the characteristics of the pulp.
  • the alkalinity of the cooking liquor may be increased, when necessary and more particularly when the said liquor is obtained by re-cycling the residual solution, by an addition of sodium carbonate or of caustic soda, in the known manner.
  • Example I Example I .-Wood from several varieties of deciduous trees is cut into shavings in the usual manner. These shavings are impregnated by suction and hydrostatic pressure with a liquor containing 8% of sodium sulphite, 1% of sodium hydrosulphite and .5 of sodium oxalate. The impregnated shavings are then cooked in a lye con taining 2% of sodium sulphite at a temperature of 145 C. for two hours.
  • the treated shavings are thereafter disintegrated.
  • wood pulp thus obtained is particularly appropriate for the manufacture of printing paper and of news print.
  • Example II The wood material is treated as in Example I, but by efiecting the cooking operation by means of the residual solution from the said Example I. The results obtained remain substantially the same.
  • Example III Wood shavings from deciduous trees are impregnated with a liquor containing 12% of sodium sulphite, 1.5% of sodium hydrosulphite and .75 of sodium oxalate. The impregnated shavings are drained and directly treated by steam under pressure at 145 C. for two hours. The treated shavings are then ground as in Example 1.
  • Example IV The wood material is treated as in EX- ample III, but it is heated at a temperature between 155 and 160 C. for only half an hour.
  • Example V The wood material is treated as in Examples I and/ or II, but with an addition of sodium carbonate to the impregnating liquor for increasing the initial pH value of the latter.
  • the characteristics of the paper pulp finally obtained are slightly afiected by the final pH value of the lye, which value may be varied at will by the addition of sodium carbonate.
  • a semi-chemical process for the manufacture of pulp from unselected and untreated deciduous wood which consists in cooking the wood material with a sodium sulphite solution containing a small percentage of sodium hydrosulphite and of sodium oxalate under such conditions that the final pH value of the solution is comprised between 5 and 7, and in thereafter mechanically reducing to pulp the cooked material.

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  • Paper (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
US693001A 1956-11-05 1957-10-29 Manufacture of wood pulp Expired - Lifetime US2920010A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1062101X 1956-11-05

Publications (1)

Publication Number Publication Date
US2920010A true US2920010A (en) 1960-01-05

Family

ID=9600447

Family Applications (1)

Application Number Title Priority Date Filing Date
US693001A Expired - Lifetime US2920010A (en) 1956-11-05 1957-10-29 Manufacture of wood pulp

Country Status (4)

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US (1) US2920010A (en:Method)
DE (1) DE1062101B (en:Method)
FR (2) FR1160482A (en:Method)
GB (1) GB829506A (en:Method)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3013934A (en) * 1958-08-12 1961-12-19 West Virginia Pulp & Paper Co High yield pulp from hardwoods
US3448003A (en) * 1966-01-03 1969-06-03 Dow Chemical Co On-stream cleaning of wood chip digesters using chelating agents
US3630832A (en) * 1969-11-10 1971-12-28 Int Paper Canada Controlled alkaline sulfite pulping
US3769152A (en) * 1970-05-13 1973-10-30 Mo Och Domsjoe Ab Digestion of wood with oxygen in the presence of alkali
US4181565A (en) * 1976-12-10 1980-01-01 Honshu Seishi Kabushiki Kaisha Process for cooking lignocellulosic material in the presence of hydroxyanthracenes and derivatives thereof
US4213821A (en) * 1976-06-02 1980-07-22 Australian Paper Manufacturers Limited Pulping with quinones and hydroquinones
USRE32943E (en) * 1976-12-10 1989-06-06 Honshu Seishi Kabushiki Kaisha Process for cooking lignocellulosic material in the presence of hydroxyanthracenes and derivatives thereof
US5169496A (en) * 1991-04-23 1992-12-08 International Paper Company Method of producing multi-ply paper and board products exhibiting increased stiffness
IT201800005473A1 (it) * 2018-05-17 2019-11-17 Processo di stabilizzazione di idrosolfito

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3393122A (en) * 1964-06-03 1968-07-16 Georgia Pacific Corp Pretreatment of green wood with reducing agent prior to storage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1859847A (en) * 1926-08-04 1932-05-24 Arthur M Hyde Pulped material and process of preparing the same
US1974751A (en) * 1934-01-06 1934-09-25 Brown Co Chemical pulping process
GB741980A (en) * 1951-03-22 1955-12-14 Asplund Arne J A Improvements in the manufacture of pulp from fibrous ligno-cellulose-containing materials

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE30072C (de) * A. FIEGEL und Dr. L. COHN i in Berlin Behandlung von Faserstoffen mit ! Lösung von schwefliger Säure, welche behufs Erj höhung ihrer Wirksamkeit mit Salz- und Essigsäure versetzt ist
DE336535C (de) * 1919-12-02 1921-05-03 Zellstoff Und Papierfabrikatio Verfahren zur Herstellung reinster Zellulose von baumwoll- oder wollartiger Beschaffenheit aus Vegetabilien mittels saurer Sulfitlaugen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1859847A (en) * 1926-08-04 1932-05-24 Arthur M Hyde Pulped material and process of preparing the same
US1974751A (en) * 1934-01-06 1934-09-25 Brown Co Chemical pulping process
GB741980A (en) * 1951-03-22 1955-12-14 Asplund Arne J A Improvements in the manufacture of pulp from fibrous ligno-cellulose-containing materials

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3013934A (en) * 1958-08-12 1961-12-19 West Virginia Pulp & Paper Co High yield pulp from hardwoods
US3448003A (en) * 1966-01-03 1969-06-03 Dow Chemical Co On-stream cleaning of wood chip digesters using chelating agents
US3630832A (en) * 1969-11-10 1971-12-28 Int Paper Canada Controlled alkaline sulfite pulping
US3769152A (en) * 1970-05-13 1973-10-30 Mo Och Domsjoe Ab Digestion of wood with oxygen in the presence of alkali
US4213821A (en) * 1976-06-02 1980-07-22 Australian Paper Manufacturers Limited Pulping with quinones and hydroquinones
USRE32203E (en) * 1976-06-02 1986-07-15 Australian Paper Manufacturers Limited Pulping with quinones and hydroquinones
US4181565A (en) * 1976-12-10 1980-01-01 Honshu Seishi Kabushiki Kaisha Process for cooking lignocellulosic material in the presence of hydroxyanthracenes and derivatives thereof
USRE32943E (en) * 1976-12-10 1989-06-06 Honshu Seishi Kabushiki Kaisha Process for cooking lignocellulosic material in the presence of hydroxyanthracenes and derivatives thereof
US5169496A (en) * 1991-04-23 1992-12-08 International Paper Company Method of producing multi-ply paper and board products exhibiting increased stiffness
IT201800005473A1 (it) * 2018-05-17 2019-11-17 Processo di stabilizzazione di idrosolfito
WO2019220248A1 (en) * 2018-05-17 2019-11-21 ESSECO S.r.l. Process for the stabilisation of hydrosulphite

Also Published As

Publication number Publication date
FR1160482A (fr) 1958-07-16
GB829506A (en) 1960-03-02
FR72957E (en:Method)
DE1062101B (de) 1959-07-23

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