US2932602A - Method of preventing depositions of pitch from sulphite pulp - Google Patents

Method of preventing depositions of pitch from sulphite pulp Download PDF

Info

Publication number
US2932602A
US2932602A US515192A US51519255A US2932602A US 2932602 A US2932602 A US 2932602A US 515192 A US515192 A US 515192A US 51519255 A US51519255 A US 51519255A US 2932602 A US2932602 A US 2932602A
Authority
US
United States
Prior art keywords
pulp
pitch
amount
surface active
alkyl
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
US515192A
Other languages
English (en)
Inventor
Holge Sigbjorn Paul Ebbinghaus
Groth Kjell Johan Ingemar
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.)
Kopparfors AB
Original Assignee
Kopparfors AB
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 Kopparfors AB filed Critical Kopparfors AB
Application granted granted Critical
Publication of US2932602A publication Critical patent/US2932602A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/07—Nitrogen-containing compounds
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/04—Pitch control

Definitions

  • the invention relates to improvements in a method of preventing depositions of pitch from sulphite pulp, particularly suspensions. of. such pulp.
  • Sulphitc pulp even the bleached quality, contains almost without exception finely dispersed particles of pitch adhering to the fibres. At times this pitch causes considerable trouble in the wet machine as well as in the subsequent manufacture of'paper or carton. Insofar as the pitch particles are sticky they clog together and deposit on beater members, press rolls, wet felts etc. As a consequence, the operation must often be stopped for cleaning. Further, clogged particles of pitch often cause spots on the surface of the paper, In modern, fast-running paper machines, the presence of sticky pitch makes it impossible to maintain the speed of the machine, so that a loss of capacity cannot be avoided.
  • the stickiness of the pitch and its tendency to clog is considered todepend on its consistence in such a way that a softer pitch often causes troubles, while harder pitchis harmless.
  • the consistence depends on the proportion of unsaturated, organic compounds contained in the pitch. Such compounds can be oxidized by the oxygen of the: air and thuswholly or partly cohverted'l into oxyor hydroxycompounds having; a higher meltingpoint and a harder, more harmless consistence; To obtain such an oxidation it is necessary to store the i surface active agents are added to the pulp in such minor amounts that the pitch particles are fixed to the fibres of the pulp.
  • pitch contains a mixture of neutral hydracarbons and compounds containing anionic carbonyl groups having a hydrophilic part. To a. certain extent 7 such carboxyl groups are concentrated to the surfaces of Woodfor a very long period of time, such as l4 20 months, so'that'.
  • the pitch hastimeto agez Also asulphite pulp containing. sti'cky' pitch can be made quite usefuliby a long time" of storage.
  • ilargestorag'e-spaces are occupied and the large'stocks: re- :quire: a :large capital. investment.
  • the method does not: always give the desired result, inthat sometimes not even a" considerably prolonged period 'of storage: for the'wood or pulp is suflicient to eliminate "the stickinessofthespitcli.
  • fi'eshz wood could be used for the pulp production, in that the planning of. the felling. would be simplified and the necessity of keepinggreat-amountsof wood and pulp sin storage would beteliminated.
  • the pitch particles whereby the particles are easily clogged and released from the fibres.
  • a cationic, surface active agent its end groups being positively charged are attracted by the negative carboxyl groups. .Thus, the pitch is' made hydrophobic and is less influenced bythe water, which results in a. fixation of the pitch particles on the fibres. H The sizeof the pitch surface and the number of carboxyl groups in it determine the required amount of cationic surface active agent. If the addition is increased, the pitchsurface will again become more hydrophilic by attracting, due to Van der Waal forces, an outer layer of long-chained ions in this case turning their hydrophobic hydrocarbon parts inwards to the out-turned hydrocarbon parts of the layer of ions first attracted. This results in a release of the pitch. An ernulsification takes place only whcnafurtlier excess of cationic surface active agent is available.
  • cationic, surface active agents useful in the method according to the invention may bementioned long-chained hydrocarbon compounds having a cationic part containing one or more three-valent or five-valent nitrogen atoms, such as primary, secondary or tertiary alkyl amines, alkyl-ammonium bases and" alkyhpyridine bases as Well as derivatives and salts of tliese compoundsp
  • the primary amines are most suitable as they show a very good effect.
  • the amines have a liimted solubility in water but dissolved in suitable solvents or in the form of dispersions in water they will yet to a great extent bring about the intended action on the pitchparticles.
  • water soluble salts such as acetates, sulphates or chlorides.
  • the fibre suspension was subjected to a vigorous agitation during two hours by means of a submerged copper propeller which was caused to rotate at a speed of about 1000 rpm; Duringi'this rotation the propeller was-coated-by a -ve'ry thin layer of pitch.
  • the propeller was weighed dry before and after the test. It is self-evident that the numerical values ob- V tained by such a method are not directly applicable in practice, but in any case the results would clearly show the tendency when adding varying amounts of agents.
  • Example 1 Amount of BF added Pitch deposition mg. per g. mg. per 1. in mg.
  • Example 2 The pulp was used in 0.4% concentration.
  • the same cationic agent, BF as in Example 1.
  • Example 3 The pulp was used in 4% concentration.
  • cationic agent cetyl pyridine chloride was used.
  • Example 4 The pulp was diluted to 0.4% concentration. pyridine chloride as cationic agent.
  • alkyl amine salt has a markedly better eifect in comparison to the quaternary ammonium salt cetyl pyridine chloride, and this has also been confirmed by practical tests in the mill. In fact, the results obtained with alkyl amine salts are to be considered most satisfactory.
  • the addition of the surface active agents may be performed after the digesting at any stage of the manufacture in the, sulphite, mill: or paper mill. To avoid an necessary losses of agents due to the removal of excess qflwlater from the pulp it may, however, be desired. to add said agents at a 'stage'of" the process where either only a small amount of water is removed by a subsequent purification or the water is returned to be used again. Thus, if desired, the addition may take place after the pulp has been thickened to about in a wet machine.
  • Fig. 5 diagrammatically illustrates a wet machine in a sulphite mill.
  • the pulp which has been diluted 'to a desired concentration is supplied from a stuff-chest 1 to an endless, rotating wire 2 in a wet machine.
  • a row of suction boxes 4, a rotating suction belt 5 and a suction couch roll 6 are placed after each other at the underside of the wire part over which the pulp 3 passes.
  • From the wire-cloth the pulp passes through three felt presses 7-9 placed after each other and is then introduced into a drying loft 10.
  • the pulp After the rotary belt 5 and before the couch roll 6 the pulp has generally a concentration of about 10%.
  • the content of water is successively reduced during the subsequent suction and pressing so that it amounts to about 50% after the last felt press.
  • the finished pulp sheet discharged from the drying loft has generally a moisture content of about 10%.
  • machines of this type are well-known and need not be described more in detail.
  • the solution is supplied from a storage container through a tube 11 mounted transversely to the machine and provided with a row of nozzles.
  • the jets hit a plate 12 mounted along the tube and directed towards the layer of pulp, so that the liquid is distributed over the upper surface of the pulp in the form of a continuous, thin curtain.
  • the solution penetrates the pulp layer, as liquid flows off from its underside.
  • the amount of liquid added is approximately equal to the weight of pulp, dry base, it is possible to obtain that the water content (50%) of the pulp after the last felt press is for the greater part derived from the solution supplied, which has now displaced the underlying water layer. In other words, it is possible to determine the amount of solution in such a way that the pulp sheet entering the drying loft is entirely impregnated with the surface active agent, at the same time as no major amounts thereof are lost.
  • the amount of surface active agents is so determined that the pulp sheet discharged from the drying loft contains a sufiicient amount thereof to ensure that no pitch troubles arise at the further treatment of the pulp in the paper mill.
  • the method according to the invention was further tried on unbleached sulphite pulp produced from the worst possible raw material, i.e. fresh spruce wood, which would normally cause considerable troubles of sticky pitch.
  • the addition of the surface active agents was carried out as described above, i.e. to the pulp upon the wire-cloth before the suction couch roll, and samples were taken from the dried pulp discharged from the drying loft. following method:
  • Example 5 When adding the cationic surface active agent stearyl amine acetate in a concentration of 0.1%, calculated on dry pulp, 21 milligrammes of pitch were obtained in the ball mill of Lampn.
  • Example 6 The alkyl amine acetate called BF used in Examples 1 and 2 was added in an amount of 0.05%, calculated on dry pulp. 20 milligrammes of pitch were obtained.
  • the numerical values obtained in the tests may not always be directly applied in practice.
  • the required quantities of surface active agents are dependent on the propontion of pitch in the pulp, the nature of the pitch, the concentration of the fibre suspension and the kind of surface active agent used, but also such factors as temperature and pH are of importance.
  • the amount of surface active agent cannot be calculated in advance but has to be determined in each special case by practical experiments.
  • pulp concentrations used in the paper industry the amount of added agent may generally be kept below 0.1% and seldom exceeds 0.2%, calculated on dry base. In most cases, however, these values are too high, and as an example it may be mentioned that an excellent result was obtained already with 0.01% as appears from Example 2.
  • a determination of the amount of surface active agent required involves no problem. As mentioned, some of the most important objects of the invention are to prevent deposition of pitch on press rolls and felts in the paper machine as well as formation of spots of pitch on the surface of the paper. If the pulp contains too great or too small an amount of surface active agents, such spots .of'pitch appear immediately on the paper and a layer of sticky pitch has been deposited on the press rolls already after 1-2 hours normal run. A too great addition becomes apparent also by a certain foaming and may be corrected by adding untreated pulp.
  • a method of preventing depositions of pitch from unbleached sulphite pulp and suspensions of such pulp which comprises adding to the pulp at least one cationic surface-active agent selected from the group consisting of alkyl amines, alkyl-amrnonium bases, alkyl-pyridine bases and the salts thereof in an amount of at most 0.1%, cal culated on the dry pulp, effective to cause .a fixation of the particles of the pitch on the fibers of the pulp.
  • a method of preventing depositions of pitch from unbleached sulphite pulp and suspensions of such pulp which comprises adding to the pulp a water soluble salt of a primary alkyl amine in an amount of at most 0.1%, calculated on the dry pulp, efi'ective to cause a fixation of the pitch on the fibers of the pulp.
  • a method of preventing depositions of pitch from unbleached sulphite pulp and suspensions of such pulp which comprises impregnating a supported sheet of partially dehydrated pulp with at least one cationic, surfaceactive agent selected from the group consisting of alkyl amines, alkyl-ammonium bases, alkyl-pyridine bases and the salts thereof in an amount of at most 0.1%, calculated References Cited in the file of this patent UNITED STATES PATENTS Fritz Jan. 24, 1939 Reynolds July 6, 1954

Landscapes

  • Paper (AREA)
US515192A 1954-06-18 1955-06-13 Method of preventing depositions of pitch from sulphite pulp Expired - Lifetime US2932602A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE339489X 1954-06-18

Publications (1)

Publication Number Publication Date
US2932602A true US2932602A (en) 1960-04-12

Family

ID=20308333

Family Applications (1)

Application Number Title Priority Date Filing Date
US515192A Expired - Lifetime US2932602A (en) 1954-06-18 1955-06-13 Method of preventing depositions of pitch from sulphite pulp

Country Status (6)

Country Link
US (1) US2932602A (enExample)
BE (1) BE539101A (enExample)
CH (1) CH339489A (enExample)
DE (1) DE1034970B (enExample)
FR (1) FR1132544A (enExample)
GB (1) GB770389A (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5292363A (en) * 1991-08-21 1994-03-08 Sequa Chemicals, Inc. Papermarking composition, process using same, and paper produced therefrom
US5296024A (en) * 1991-08-21 1994-03-22 Sequa Chemicals, Inc. Papermaking compositions, process using same, and paper produced therefrom
US5749863A (en) * 1994-03-18 1998-05-12 The Procter & Gamble Company Fluid acquisition and distribution member for absorbent core
US5873979A (en) * 1994-03-18 1999-02-23 The Procter & Gamble Company Preparing individualized polycarboxylic acid crosslinked cellulosic fibers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB937935A (en) * 1959-01-23 1963-09-25 Rohm & Haas Improvements in or relating to the manufacture of paper
US4995944A (en) * 1988-09-16 1991-02-26 Dearborn Chemical Company Ltd. Controlling deposits on paper machine felts using cationic polymer and cationic surfactant mixture

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2144756A (en) * 1937-10-14 1939-01-24 Nat Oil Prod Co Process of treating wood pulp to remove pitch
US2683089A (en) * 1952-06-10 1954-07-06 American Cyanamid Co Bibulous sheet

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE742617C (de) * 1941-03-28 1943-12-14 Chem Fab Joh A Benckiser G M B Verfahren zur Verhuetung von Harzausscheidungen bei der Papierherstellung
NL58741C (enExample) * 1940-08-19

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2144756A (en) * 1937-10-14 1939-01-24 Nat Oil Prod Co Process of treating wood pulp to remove pitch
US2683089A (en) * 1952-06-10 1954-07-06 American Cyanamid Co Bibulous sheet

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5292363A (en) * 1991-08-21 1994-03-08 Sequa Chemicals, Inc. Papermarking composition, process using same, and paper produced therefrom
US5296024A (en) * 1991-08-21 1994-03-22 Sequa Chemicals, Inc. Papermaking compositions, process using same, and paper produced therefrom
US5393334A (en) * 1991-08-21 1995-02-28 Sequa Chemicals, Inc. Papermaking compositions, process using same, and paper produced therefrom
US5417753A (en) * 1991-08-21 1995-05-23 Sequa Chemicals, Inc. Papermaking compositions, process using same, and paper produced therefrom
US5749863A (en) * 1994-03-18 1998-05-12 The Procter & Gamble Company Fluid acquisition and distribution member for absorbent core
US5873979A (en) * 1994-03-18 1999-02-23 The Procter & Gamble Company Preparing individualized polycarboxylic acid crosslinked cellulosic fibers

Also Published As

Publication number Publication date
FR1132544A (fr) 1957-03-12
BE539101A (enExample) 1955-12-19
CH339489A (de) 1959-06-30
DE1034970B (de) 1958-07-24
GB770389A (en) 1957-03-20

Similar Documents

Publication Publication Date Title
US3264172A (en) Bacteriostatic paper containing a guanidine salt and method of making the same
US4444621A (en) Process and apparatus for the deresination and brightness improvement of cellulose pulp
KR100543841B1 (ko) 종이 제품, 및 화학 첨가제를 셀룰로오스계 섬유에 가하는방법
US2944931A (en) Sanitary paper and process of making the same
US3067087A (en) Manufacture of paper of organic hydrophobic fibers
US2932602A (en) Method of preventing depositions of pitch from sulphite pulp
DE69731486T2 (de) Verfahren zur inhibition organischer ablagerungen bei der pulpe- und papierherstellung
US2360779A (en) Method of screening and washing paper pulp
US2144756A (en) Process of treating wood pulp to remove pitch
DE69701191T2 (de) Verfahren zur inhibition organischer ablagerungen in zellstoff- und papierherstellungsanlagen
US3316141A (en) Process of dewatering sulphate pulp to contain less shives therein
US2915428A (en) Process for controlling slime in paper making systems and products therefrom
NO117563B (enExample)
US2697384A (en) Process for removing dirt from wood pulp
JP2588465B2 (ja) メカニカルパルプにおけるピッチ障害を低減させる方法
US3817828A (en) Method of microbiological control of paper mill processes
US3052594A (en) Slimicides
US3006807A (en) Slimicide
US2061935A (en) Manufacture of cellulose pulp
US3017319A (en) Slimicide
US4435248A (en) Process for producing photographic paper
US2048293A (en) Manufacture of absorbent clothlike paper
US564353A (en) Method of and apparatus for coloring webs of paper
US1950351A (en) Paper manufacture
US3055797A (en) Method of manufacturing sequin impregnated tissue paper