US1576994A - Deinking paper stock - Google Patents

Deinking paper stock Download PDF

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Publication number
US1576994A
US1576994A US6949925A US1576994A US 1576994 A US1576994 A US 1576994A US 6949925 A US6949925 A US 6949925A US 1576994 A US1576994 A US 1576994A
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US
United States
Prior art keywords
stock
paper stock
alkali
deinking paper
same
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
Inventor
Joseph E Plumstead
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.)
Jessup & Moore Paper Co
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Jessup & Moore Paper 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 Jessup & Moore Paper Co filed Critical Jessup & Moore Paper Co
Priority to US6949925 priority Critical patent/US1576994A/en
Application granted granted Critical
Publication of US1576994A publication Critical patent/US1576994A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

Definitions

  • Patented is, 1926.
  • MOORE PAPER (30., OF PHILADELPHIA,
  • My present invention relates to a process 19 of de-inking printed stock or de-colorizing colored stock and bleaching the same in order to produce commercial pulp and paper therefrom.
  • the principal object of the invention re? sides in simultaneously deterging and bleaching the printed or colored stock in one and the same batch.
  • the invention contemplates the mixing of the macerated mass of printed stock with a reagent which contains a mixture of alkali and its hypochlorite. ordinarily in the presence of elevated temperature.
  • a reagent which contains a mixture of alkali and its hypochlorite. ordinarily in the presence of elevated temperature.
  • the usual method for de-inking-paper stock at present in vogue among commercial plants, is to macerate the stock in water 1 until the consistency is such that thestock will flow.
  • This maccrated stock is agitated with 3 usually carbon. After this operation has been carried on for a )roper length of time, the stock is washer rce of the alkali and ink and then a calcium h-ypochlorite bleach u'ed.
  • the use of commercial calcium hypm chlorite bleach is undesirable because of the fact that" there is a considerable amount of carbon dioxide pre:ent in the batch which results in the formation of insoluble calcium carbonate which cannot be completely re moved which tends towards producing an inferior product. After the bleaching "period a second washing must take place; 4
  • the proportion of the alkali which must be present as hypochlorite will vary from to 75% of the total soda-used and that the total soda ufed will vary from 5 pounds to 20 pounds per 100 pounds of paper stock used. These variations are caused by the difference in the desired quality of ultimate product and also by the differences in the quality of stock to be treated. I have also foundthat it is necessary to agitate the heated mixture for periods varying from minutes to 6 hours depending upon the kind of stock used and the quality desired in the finished product.
  • a method of de-inking paper stock which consists in macerat'ing the same with an alkaline sodium compound, introducing liquid chlorine to the agitated mass until from 25 to 75% of the soda has combined therewith to form sodium hypochlorite, and then cooking the mass.

Landscapes

  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Toxicology (AREA)
  • Paper (AREA)

Description

Patented is, 1926.
UNITED STATES PATIENT OFFICE.
MOORE PAPER (30., OF PHILADELPHIA,
MASSACHUSETTS.
PENNSYLVANIA, A CORPORATION or DEINKING PAPER s'rocx.
No Drawing.
T all whom it HZUfI/COHCGTR.
Be it known that I, JosErH E. PLUM'srn-m,
a citizen of the United States, and resident of W'ihnington. in the county of New Castle and State of Delaware, have invented certain new and useful Improvements in Deinking Paper Stock, of-which the following is a specification.
My present invention relates to a process 19 of de-inking printed stock or de-colorizing colored stock and bleaching the same in order to produce commercial pulp and paper therefrom.
The principal object of the invention re? sides in simultaneously deterging and bleaching the printed or colored stock in one and the same batch.
To this end the invention contemplates the mixing of the macerated mass of printed stock with a reagent which contains a mixture of alkali and its hypochlorite. ordinarily in the presence of elevated temperature. The usual method for de-inking-paper stock at present in vogue among commercial plants, is to macerate the stock in water 1 until the consistency is such that thestock will flow.
This maccrated stock is agitated with 3 usually carbon. After this operation has been carried on for a )roper length of time, the stock is washer rce of the alkali and ink and then a calcium h-ypochlorite bleach u'ed. The use of commercial calcium hypm chlorite bleach is undesirable because of the fact that" there is a considerable amount of carbon dioxide pre:ent in the batch which results in the formation of insoluble calcium carbonate which cannot be completely re moved which tends towards producing an inferior product. After the bleaching "period a second washing must take place; 4
fibers, thoroughly saponify the vehicle and at the, same time to whiten any organic,
coloring matter which. may be present,
an alkali in order to saponify the ink vehicle and free the ink or color pigment which ismaking the normal number of steps four Application filed November 16, 1925. Serial ITO. 65,499.
have found that the proportion of the alkali which must be present as hypochlorite will vary from to 75% of the total soda-used and that the total soda ufed will vary from 5 pounds to 20 pounds per 100 pounds of paper stock used. These variations are caused by the difference in the desired quality of ultimate product and also by the differences in the quality of stock to be treated. I have also foundthat it is necessary to agitate the heated mixture for periods varying from minutes to 6 hours depending upon the kind of stock used and the quality desired in the finished product.
By the use of soda ash,'or caustic soda,
and liquid chlorine in the reaction mixture,
I find that I am able to simultaneously dcterge and beach in the one operation, and get at the same time a superior color in addition to cutting down the time of operationl and the quantityv and cost of materials use I have found that either soda aih or caustic soda may be used, as the alkali in the process, the choice of the two depending upon which is commercially available, as
each gives excellent results.
Having thus described my invention, what I claim is: 4
l. A method of de-inking paper stock. which con'ists in treating the same with an alkali and a corresponding. hypochloi-ite. 2. A method of tie-inking paper stock.
which consists in maccrating the stock and I then treating the same with a soluble alkali and a soluble hypochlorite.
3. A method of tie-inking paper stock.
which consists in macerating the stock and then treating the same simultaneously with an alkali and sodium hypochlorite.
4. A method of (lo-inking paper stock, which comists in macerating the same. agitatingthe mace'rated' stock with an alkali. introducing chlorine to said mixture, and cooking the resultant mixture.
5. A method of de-inking paper stock, which consists in macerat'ing the same with an alkaline sodium compound, introducing liquid chlorine to the agitated mass until from 25 to 75% of the soda has combined therewith to form sodium hypochlorite, and then cooking the mass. I
In testimony whereof, I afiix my signature.
JOSEPH E. PLUMSTEAD.
US6949925 1925-11-16 1925-11-16 Deinking paper stock Expired - Lifetime US1576994A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2525594A (en) * 1947-03-06 1950-10-10 Du Pont Deinking waste paper
US2580161A (en) * 1947-03-13 1951-12-25 Driessen Cornelius Clarence Process of deinking printed waste paper
US2582496A (en) * 1947-10-09 1952-01-15 St Regis Paper Co Deinking and bleaching of paper
US2620271A (en) * 1945-07-24 1952-12-02 Mead Corp Deinking waste paper containing groundwood
US3021252A (en) * 1960-03-31 1962-02-13 Lawrence Paper Co Process of making wax-containing paper using waste wax paper
US3427217A (en) * 1960-01-28 1969-02-11 Hercules Inc Repulping of wet-strength broke containing wet-strength resin
FR2367858A1 (en) * 1976-10-15 1978-05-12 Interox OLD PAPER REGENERATION PROCESS

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2620271A (en) * 1945-07-24 1952-12-02 Mead Corp Deinking waste paper containing groundwood
US2525594A (en) * 1947-03-06 1950-10-10 Du Pont Deinking waste paper
US2580161A (en) * 1947-03-13 1951-12-25 Driessen Cornelius Clarence Process of deinking printed waste paper
US2582496A (en) * 1947-10-09 1952-01-15 St Regis Paper Co Deinking and bleaching of paper
US3427217A (en) * 1960-01-28 1969-02-11 Hercules Inc Repulping of wet-strength broke containing wet-strength resin
US3021252A (en) * 1960-03-31 1962-02-13 Lawrence Paper Co Process of making wax-containing paper using waste wax paper
FR2367858A1 (en) * 1976-10-15 1978-05-12 Interox OLD PAPER REGENERATION PROCESS

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