GB684742A - Method of bleaching chemical pulp - Google Patents

Method of bleaching chemical pulp

Info

Publication number
GB684742A
GB684742A GB11415/51A GB1141551A GB684742A GB 684742 A GB684742 A GB 684742A GB 11415/51 A GB11415/51 A GB 11415/51A GB 1141551 A GB1141551 A GB 1141551A GB 684742 A GB684742 A GB 684742A
Authority
GB
United Kingdom
Prior art keywords
per cent
pulp
bleached
brightness
density
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
Application number
GB11415/51A
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.)
BUFFALO ELECTRO CHEM CO
Original Assignee
BUFFALO ELECTRO CHEM CO
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 BUFFALO ELECTRO CHEM CO filed Critical BUFFALO ELECTRO CHEM CO
Publication of GB684742A publication Critical patent/GB684742A/en
Expired 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
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

Chemical pulp such as sulphate or sulphite pulp is bleached in two stages, firstly with hypochlorite to a brightness greater than 65 expressed as percentage reflectance, and then, at a pulp concentration not less than 30 per cent and at a temperature below 130 DEG F., with alkaline peroxide, the total alkalinity of which is 0.3 to 3.25 per cent calculated as NaOH and based on the dry weight of the fibre. The amount of peroxide used is 0.1 to 1.5 per cent calculated as H2O2 and based on the dry weight of the fibre. In examples: (1) conventionally bleached sulphite pulp of brightness 82.6 is de-watered to 50 per cent pulp density and bleached at room temperature by adding 1 per cent hydrogen peroxide, 4 per cent sodium silicate and 1 per cent caustic soda calculated on the dry pulp; (2) partially bleached sulphate pulp of brightness 70.3 is treated at density 45 per cent as in (1); (3) partially bleached hardwood sulphite pulp of brightness 75.5 is bleached at a pulp density of 45 per cent as in (1); (4) partially-bleached sulphite pulp of brightness 73.1 is bleached at a pulp density of 32 per cent with 0.5 per cent hydrogen peroxide, 4 per cent silicate and 0.5 per cent caustic soda at room temperature; and (5) partially bleached sulphate pulp of brightness 68.5 is bleached at a pulp density of 45 per cent as in (1). Instead of caustic soda, other alkalis such as trisodium phosphate, sodium carbonate, sodium silicate and sodium pyrophosphate may be used. Peroxide stabilizers such as sodium silicate and magnesium sulphate may also be present.
GB11415/51A 1950-06-30 1951-05-16 Method of bleaching chemical pulp Expired GB684742A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US171548A US2661261A (en) 1950-06-30 1950-06-30 Method of superbleaching chemical pulp

Publications (1)

Publication Number Publication Date
GB684742A true GB684742A (en) 1952-12-24

Family

ID=22624155

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11415/51A Expired GB684742A (en) 1950-06-30 1951-05-16 Method of bleaching chemical pulp

Country Status (5)

Country Link
US (1) US2661261A (en)
CH (1) CH297856A (en)
DE (1) DE973632C (en)
FR (1) FR1043060A (en)
GB (1) GB684742A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1043789B (en) * 1954-11-19 1958-11-13 Fmc Corp Process to stabilize the degree of whiteness of already bleached pulp for paper manufacture
WO2009015704A1 (en) * 2007-07-31 2009-02-05 Voith Patent Gmbh Bleached fibrous material

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2779656A (en) * 1953-06-16 1957-01-29 Du Pont Bleaching of kraft pulp
US2822236A (en) * 1954-11-19 1958-02-04 Fmc Corp Process of maintaining brightness in high density wood pulp having a ph6-10 by adding hydrogen peroxide and composition produced thereby
US3020197A (en) * 1960-08-05 1962-02-06 Allied Chem Method for production of high brightness high strength wood pulps
US3020196A (en) * 1960-08-05 1962-02-06 Allied Chem Production of high brightness high strength wood pulps
FR2553444B1 (en) * 1983-10-13 1986-07-18 Centre Tech Ind Papier HYPOCHLORITE TREATMENT OF CHEMICAL PAPER PULP

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA461240A (en) * 1949-11-22 L. Mcewen Robert Paper furnish constituent and method of making the furnish
US1768820A (en) * 1922-03-16 1930-07-01 Bradley Mckeefe Corp Method of bleaching pulp
DE507759C (en) * 1924-09-23 1930-09-22 Degussa Process for bleaching unobstructed plant fibers (especially cotton) with alkaline hydrogen peroxide solutions
DE541303C (en) * 1926-04-28 1932-01-06 Max Steinschneider Dipl Ing Process for the production of a low-viscosity viscose solution for the manufacture of rayon
GB265055A (en) * 1926-06-01 1927-02-03 Robinson Fiber Corp Improvements in or relating to the treatment of paper pulp stock
DE573341C (en) * 1927-02-27 1933-03-31 Max Steinschneider Dipl Ing Process for the production of cellulose, in particular for the manufacture of rayon
DE573739C (en) * 1928-11-28 1933-04-05 Degussa Process for the production of highly viscous cellulose solutions
AT142240B (en) * 1931-09-17 1935-06-25 Carl Busch Thorne Method and apparatus for bleaching and cleaning pulp and the like. like
US2107297A (en) * 1934-03-08 1938-02-08 Buffalo Electro Chem Co Bleaching fiber
US2125634A (en) * 1937-03-29 1938-08-02 Oxford Paper Co Method of bleaching pulp or paper webs
US2150926A (en) * 1937-07-03 1939-03-21 Buffalo Electro Chem Co Process of making and bleaching paper
DE736070C (en) * 1938-07-01 1943-06-07 Degussa Process for treating pulp
US2377171A (en) * 1940-09-28 1945-05-29 Champion Paper & Fibre Co Process of bleaching pulp
US2465738A (en) * 1945-12-22 1949-03-29 Buffalo Electro Chem Co Method of bleaching mechanical wood fibers
FR947783A (en) * 1946-01-24 1949-07-12 Du Pont Improvements made to the bleaching of wood pulps
US2492047A (en) * 1946-03-30 1949-12-20 Du Pont Bleaching wood pulp
US2494542A (en) * 1946-05-02 1950-01-17 Niagara Alkali Company Method of bleaching pulp
US2513344A (en) * 1946-09-19 1950-07-04 Buffalo Electro Chem Co Method of bleaching high-density pulp
US2510595A (en) * 1946-09-20 1950-06-06 Buffalo Electro Chem Co Method of bleaching groundwood
US2514503A (en) * 1947-07-30 1950-07-11 Buffalo Electro Chem Co Method of bleaching moist felted groundwood pulp
US2466633A (en) * 1948-05-26 1949-04-05 James M Daily Method of bleaching cellulosic pulp

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1043789B (en) * 1954-11-19 1958-11-13 Fmc Corp Process to stabilize the degree of whiteness of already bleached pulp for paper manufacture
WO2009015704A1 (en) * 2007-07-31 2009-02-05 Voith Patent Gmbh Bleached fibrous material

Also Published As

Publication number Publication date
DE973632C (en) 1960-04-21
US2661261A (en) 1953-12-01
CH297856A (en) 1954-04-15
FR1043060A (en) 1953-11-05

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