GB264596A - Process and apparatus for bleaching cellulose pulp and similar fibrous materials - Google Patents

Process and apparatus for bleaching cellulose pulp and similar fibrous materials

Info

Publication number
GB264596A
GB264596A GB26369/25A GB2636925A GB264596A GB 264596 A GB264596 A GB 264596A GB 26369/25 A GB26369/25 A GB 26369/25A GB 2636925 A GB2636925 A GB 2636925A GB 264596 A GB264596 A GB 264596A
Authority
GB
United Kingdom
Prior art keywords
bleaching
pulp
tower
towers
mixer
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
GB26369/25A
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
Publication of GB264596A publication Critical patent/GB264596A/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
    • D21C9/1026—Other features in bleaching processes

Abstract

264,596. Thorne, C. B. Oct. 21, 1925. Bleaching, processes for; gases and vapours, treating with; passing materials through fluid - applying apparatus. - In a process for bleaching cellulose pulp or similar fibrous material, the material is first mixed with bleaching liquid so that it is uniformly moistened but is not free flowing, and then air or other gas is forced through whilst the moistened material is in continuous motion in such a manner that the air or gas is distributed throughout the mass. In a method using a series of bleaching towers 30, 41, 44, the unbleached pulp passes through a concentrator 2 which removes the surplus water, and thence passes to an equalizing tower 3 the purpose of which is to produce a uniform flow to a mixer 5. A rotating scraper arm 58<1> assists the flow to the mixer. The bleaching agent and water are supplied to the mixer from head boxes 13, 23 respectively, a uniform flow being maintained by well-known measuring boxes 20, 27. The mixture then passes successively through the tower 30, 41. 44 where the bleaching action takes place. In passing from one tower to the next, the pulp is led through a combined washer and thickener 36 communicating with a mixer 37 supplied with bleaching agent and water, the operation being the same in each stage. Passing through the bleaching towers is a hollow rotating shaft 45 carrying within each tower a levelling arm 56, a scraper arm 58 and a nozzle 53 through which compressed air is passed into the pulp to drive out the gases of decomposition. The nozzle is preferably situated below the centre of the tower. A water spray 60 at the bottom of each tower assists the removal of the pulp as it is displaced bv the scraper arm. In a modified apparatus. the bleaching of the pulp after passing from the mixer 37 is completed in any known form of apparatus for the bleaching of pulp at low density. The equalizing and bleaching towers are preferably circular in cross-section. In a modification where towers of square cross-section are used, the compressed air is supplied by means of stationary nozzles extending vertically through the open tops of the bleaching towers, and revolving floor grate members are fitted at the bottoms of the towers to assist the discharge of the pulp.
GB26369/25A 1924-12-06 1925-10-21 Process and apparatus for bleaching cellulose pulp and similar fibrous materials Expired GB264596A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US754387A US1642978A (en) 1924-12-06 1924-12-06 Process for bleaching and like purposes

Publications (1)

Publication Number Publication Date
GB264596A true GB264596A (en) 1927-01-21

Family

ID=10242570

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26369/25A Expired GB264596A (en) 1924-12-06 1925-10-21 Process and apparatus for bleaching cellulose pulp and similar fibrous materials

Country Status (4)

Country Link
US (1) US1642978A (en)
DE (1) DE488773C (en)
FR (1) FR699075A (en)
GB (1) GB264596A (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL93061C (en) * 1950-05-11
FR1132120A (en) * 1954-10-04 1957-03-05 Mo Och Domsjoe Ab Improvements in the bleaching of fibrous materials containing cellulose
US3052592A (en) * 1958-10-15 1962-09-04 Bauer Bros Co Pulp bleaching
SE415581B (en) * 1977-04-18 1980-10-13 Mo Och Domsjoe Ab PROCEDURE FOR PEROCID WHITING OF HOG REPLACEMENT MASS
US4259150A (en) * 1978-12-18 1981-03-31 Kamyr Inc. Plural stage mixing and thickening oxygen bleaching process
US5211811A (en) * 1989-02-15 1993-05-18 Union Camp Patent Holding, Inc. Process for high consistency oxygen delignification of alkaline treated pulp followed by ozone delignification
US5188708A (en) * 1989-02-15 1993-02-23 Union Camp Patent Holding, Inc. Process for high consistency oxygen delignification followed by ozone relignification
US5472572A (en) * 1990-10-26 1995-12-05 Union Camp Patent Holding, Inc. Reactor for bleaching high consistency pulp with ozone
US5181989A (en) * 1990-10-26 1993-01-26 Union Camp Patent Holdings, Inc. Reactor for bleaching high consistency pulp with ozone
US5409570A (en) * 1989-02-15 1995-04-25 Union Camp Patent Holding, Inc. Process for ozone bleaching of oxygen delignified pulp while conveying the pulp through a reaction zone
US5164043A (en) * 1990-05-17 1992-11-17 Union Camp Patent Holding, Inc. Environmentally improved process for bleaching lignocellulosic materials with ozone
US5164044A (en) * 1990-05-17 1992-11-17 Union Camp Patent Holding, Inc. Environmentally improved process for bleaching lignocellulosic materials with ozone
US5520783A (en) * 1990-10-26 1996-05-28 Union Camp Patent Holding, Inc. Apparatus for bleaching high consistency pulp with ozone
US5174861A (en) * 1990-10-26 1992-12-29 Union Camp Patent Holdings, Inc. Method of bleaching high consistency pulp with ozone
NZ242792A (en) * 1991-05-24 1993-12-23 Union Camp Patent Holding Two-stage pulp bleaching reactor: pulp mixed with ozone in first stage.
US5554259A (en) * 1993-10-01 1996-09-10 Union Camp Patent Holdings, Inc. Reduction of salt scale precipitation by control of process stream Ph and salt concentration

Also Published As

Publication number Publication date
US1642978A (en) 1927-09-20
DE488773C (en) 1930-01-13
FR699075A (en) 1931-02-10

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