US1902106A - Method of manufacturing paper pulp - Google Patents

Method of manufacturing paper pulp Download PDF

Info

Publication number
US1902106A
US1902106A US325398A US32539828A US1902106A US 1902106 A US1902106 A US 1902106A US 325398 A US325398 A US 325398A US 32539828 A US32539828 A US 32539828A US 1902106 A US1902106 A US 1902106A
Authority
US
United States
Prior art keywords
liquor
paper pulp
sodium
sulphide
cooking
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US325398A
Inventor
Alfred M Thomsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US325398A priority Critical patent/US1902106A/en
Application granted granted Critical
Publication of US1902106A publication Critical patent/US1902106A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0064—Aspects concerning the production and the treatment of green and white liquors, e.g. causticizing green liquor
    • D21C11/0078—Treatment of green or white liquors with other means or other compounds than gases, e.g. in order to separate solid compounds such as sodium chloride and carbonate from these liquors; Further treatment of these compounds

Definitions

  • the object of my invention is not only to get a stronger fibre than that produced from such trees, grasses, and other substances, as are now utilized in the manufacture of paper pulp, but principally to use such substances as do not produce good pulp by existing processes.
  • Such materials are: Saw-mill wastes of all description, mixtures of woods, sugarcane bagasse, corn-stalks, barks, and a great series of trees, for example redwood, which do not yield commercial pulp by means now available.
  • such substances are resolved into fibres by either an acid or an alkali meth- 0d.
  • the active substance employed is sulphur dioxide in combination with some base or mixtures of bases; in the latter, the active substance is either caustic soda or a mixture of caustic soda and sodium sulphide.
  • tive agent is not employed at present although it is far superior to caustic soda or any admixture of the same.
  • the reason for this anomaly is purely economic. Any proc- 2 ess using a sodium salt as a cooking medium must be regenerative, e. g., the soda salt must be reclaimed in such form that it may be used again, otherwise the method becomes too expensive.
  • sulphate of soda is used as the source of alkali.
  • the process of reclamation it is converted into a mixture of carbonate and sulphide, and as the carbonate is inactive in the cooking it is converted into the activecaustic soda by causticizin the green liquor, e. g., a mixture of car onate, sulphide, and sulphate of sodium in solution, by means of lime.
  • the cooking liquor of both 40 processes therefore becomes a mixture of caustic soda and sodium sulphide.
  • My process therefore, consists of the following steps n (a) Digesting the material containing fibre with a solution containing as alkali a mixture of carbonate, sulphate, and sulphide of 'sodi- '60 um;
  • I claim 1 In the process of manufacturin paper pulp, the method of liberating the fibre by cooking with a liquor containing sodium sulphide as the sole active agent, and separating the fibre from the spent cooking liquor, evaporating said liquor to a syrupy consis- 90 tency, incinerating it in a reducing atmosphere, dissolving the ashes in water, separating sodium carbonate formed during incinerating by fractional crystallization, and using the resultant mother liquor for making up fresh cooking liquor.

Landscapes

  • Paper (AREA)

Description

Patented Mar. 21, 1933 UNITED STATES ALFRED M. THOMSEN, OF SAN FRANCISCO, CALIFORNIA METHOD OF MANUFACTURING PAPER PULP No Drawing.
The object of my invention is not only to get a stronger fibre than that produced from such trees, grasses, and other substances, as are now utilized in the manufacture of paper pulp, but principally to use such substances as do not produce good pulp by existing processes. Such materials are: Saw-mill wastes of all description, mixtures of woods, sugarcane bagasse, corn-stalks, barks, and a great series of trees, for example redwood, which do not yield commercial pulp by means now available.
In general, such substances are resolved into fibres by either an acid or an alkali meth- 0d. In the former, the active substance employed is sulphur dioxide in combination with some base or mixtures of bases; in the latter, the active substance is either caustic soda or a mixture of caustic soda and sodium sulphide.
tive agent is not employed at present although it is far superior to caustic soda or any admixture of the same. The reason for this anomaly is purely economic. Any proc- 2 ess using a sodium salt as a cooking medium must be regenerative, e. g., the soda salt must be reclaimed in such form that it may be used again, otherwise the method becomes too expensive.
In the present Sulphate and Kraft processes, sulphate of soda is used as the source of alkali. In the process of reclamation it is converted into a mixture of carbonate and sulphide, and as the carbonate is inactive in the cooking it is converted into the activecaustic soda by causticizin the green liquor, e. g., a mixture of car onate, sulphide, and sulphate of sodium in solution, by means of lime. The cooking liquor of both 40 processes, therefore becomes a mixture of caustic soda and sodium sulphide.
In my improved method I use as the active agent only sodium sulphide, and as the car bonate formed during each passage of the 4 alkali through the cooking and reclamation Sodium sulphide as the sole ac- Application filed December 11, 1928. Serial No. 325,398.
phases would soon swamp the active reagent in inert material I separate the excess carbonate from the green liquor by crystallization and the constant removal of these crystals. My cooking alkali therefore becomes a mixture of carbonate, sulphide, and sulphate, to which I constantly add sulphate to make good all losses, and from which I constantly remove the excess of sodium carbonate produced.
My process, therefore, consists of the following steps n (a) Digesting the material containing fibre with a solution containing as alkali a mixture of carbonate, sulphate, and sulphide of 'sodi- '60 um;
(b) Separating the spent solution from the pulp; Y
c) Evaporating the solution;
(13) Adding sulphate of sodium;
e) Incinerating the mixed organic and mineral contents of said solution, the latter remaining as ashes;
(f) Dissolving these ashes, which are a mixture of carbonate, sulphide, and sulphate of sodium, and removing the excess carbonate, thus obtaining again a liquor of the same composition as used in (a).
I claim 1. In the process of manufacturin paper pulp, the method of liberating the fibre by cooking with a liquor containing sodium sulphide as the sole active agent, and separating the fibre from the spent cooking liquor, evaporating said liquor to a syrupy consis- 90 tency, incinerating it in a reducing atmosphere, dissolving the ashes in water, separating sodium carbonate formed during incinerating by fractional crystallization, and using the resultant mother liquor for making up fresh cooking liquor.
2. In the process of manufacturin paper pulp, the method of liberating the bre by cooking with a liquor containing sodium sulphide as the sole active agent, and separat- 9 ing the fibre from the spent cooking liquor, evaporating said liquor to a syrupy consistency, adding sodium sulphate, incinerating it in a reducing atmosphere, dissolving the 5 ashes in Water, separating sodium carbonate formed during inoinerating by fractional crystallization, and using the resultant mother liquor for making up fresh cooking liquor. In testimony whereof, I have hereunto set my signature.
ALFRED M. THOMSEN.
US325398A 1928-12-11 1928-12-11 Method of manufacturing paper pulp Expired - Lifetime US1902106A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US325398A US1902106A (en) 1928-12-11 1928-12-11 Method of manufacturing paper pulp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US325398A US1902106A (en) 1928-12-11 1928-12-11 Method of manufacturing paper pulp

Publications (1)

Publication Number Publication Date
US1902106A true US1902106A (en) 1933-03-21

Family

ID=23267723

Family Applications (1)

Application Number Title Priority Date Filing Date
US325398A Expired - Lifetime US1902106A (en) 1928-12-11 1928-12-11 Method of manufacturing paper pulp

Country Status (1)

Country Link
US (1) US1902106A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2898994A (en) * 1953-03-31 1959-08-11 Alfred M Thomsen Method of making paper pulp
US3347739A (en) * 1962-09-15 1967-10-17 Ii George H Tomlinson Continuous sodium sulfide pulping of cellulosic material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2898994A (en) * 1953-03-31 1959-08-11 Alfred M Thomsen Method of making paper pulp
US3347739A (en) * 1962-09-15 1967-10-17 Ii George H Tomlinson Continuous sodium sulfide pulping of cellulosic material
DE1290037B (en) * 1962-09-15 1969-02-27 Domtar Ltd Process for making pulp stockings

Similar Documents

Publication Publication Date Title
GB426392A (en) Improvements in the manufacture of phosphoric acid
US1902106A (en) Method of manufacturing paper pulp
SU575032A3 (en) Method of separating polyelectrolyte ligninosulfoacids
US1970258A (en) Manufacture of pulp
US1817525A (en) Production of chemical wood pulp
US2445838A (en) Treatment of waste sulfite liquor
US1815328A (en) Process of recovering and utilizing the valuable compounds in spent cooking liquors
US2122113A (en) Process for producing stable sulphuric acid ester salts of leucovat-dyestuffs in dry state
US1303177A (en) Process of producing ligno tanning material from waste sulfite liquors
US1823519A (en) Manufacture of sulphite paper pulp
US1754207A (en) Treatment of residual liquors
US1832375A (en) Process for the production of cellulose and hydrocarbons from sugar cane sprouts and refuse and burnt and frozen cane
US1631789A (en) Manufacture of paper pulp
US1958439A (en) Recovery of organic constituents from black liquor
US1660696A (en) Process of producing cellulose and other chemical products
US1210726A (en) Manufacture of phenol.
US1781733A (en) Cyclic process of fiber liberation
US1643826A (en) Process for making paper pulp
US2035366A (en) Process of recovering strontium
US3322615A (en) Disaggregating agents derived from unsaturated hydrocarbons of petroleum fractions for manufacturing paper and pulp
US2148275A (en) Manufacture of surface active
US1854762A (en) Manufacture of sodium thiosulphate
US1240920A (en) Method of preparing sulfite cellulose.
US1828848A (en) Production of chemical wood pulps
US1941760A (en) Method of producing valuable prod