GB410742A - Process for the recovery of pulp from printed paper - Google Patents

Process for the recovery of pulp from printed paper

Info

Publication number
GB410742A
GB410742A GB2949032A GB2949032A GB410742A GB 410742 A GB410742 A GB 410742A GB 2949032 A GB2949032 A GB 2949032A GB 2949032 A GB2949032 A GB 2949032A GB 410742 A GB410742 A GB 410742A
Authority
GB
United Kingdom
Prior art keywords
ink
paper
nearly
bleaching agent
insoluble
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
GB2949032A
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.)
LEWIS LOSEY ALSTED
Original Assignee
LEWIS LOSEY ALSTED
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 LEWIS LOSEY ALSTED filed Critical LEWIS LOSEY ALSTED
Publication of GB410742A publication Critical patent/GB410742A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • 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
    • D21C5/02—Working-up waste paper
    • D21C5/025—De-inking
    • D21C5/027—Chemicals therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Landscapes

  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Paper (AREA)
  • Coloring Foods And Improving Nutritive Qualities (AREA)
  • Coloring (AREA)

Abstract

410,742. De-inking printed paper. ALSTED, L. L., Appleton, Wisconsin, U.S.A. Oct. 21, 1932, No. 29490. Convention date, Oct. 24, 1931. [Class 96.] Paper containing ground wood and printed on with an ink capable of being bleached is made available for reprinting and use by subjecting the ink to the reducing action of a sulphite bleaching agent, followed if desired by treatment with a neutralizing agent, whereby the colour of the ink is destroyed while the paper is maintained white or at its original colour. The paper is shredded and treated when suspended in water with the bleaching agent which also bleaches the ground wood in the pulp. Sulphurous acid is employed as the bleaching agent and borax as the neutralizing agent. The ink is formed from materials of two groups of black or nearly black dyestuffs of coal tar dyes capable of being discharged by hydrosulphites, or of the group of vegetable dyestuffs such as tannin dyes and dye wood extracts. The dyestuff is converted into insoluble or nearly insoluble lakes by known methods, the coal tar dyes nearly all yielding insoluble lakes with barium chloride and the dye woods and tannins with iron and manganese salts. Reference has been directed by the Comptroller to Specifications 117,023 and 320,430, [both in Class 146 (iii)].
GB2949032A 1931-10-24 1932-10-21 Process for the recovery of pulp from printed paper Expired GB410742A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US410742XA 1931-10-24 1931-10-24

Publications (1)

Publication Number Publication Date
GB410742A true GB410742A (en) 1934-05-22

Family

ID=21914577

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2949032A Expired GB410742A (en) 1931-10-24 1932-10-21 Process for the recovery of pulp from printed paper

Country Status (3)

Country Link
DE (1) DE615107C (en)
FR (1) FR744940A (en)
GB (1) GB410742A (en)

Also Published As

Publication number Publication date
DE615107C (en) 1935-06-27
FR744940A (en) 1933-04-27

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