GB893334A - Improvements in the treatment of cellulosic fibrous materials for the production of purified cellulose or partially-purified cellulose - Google Patents
Improvements in the treatment of cellulosic fibrous materials for the production of purified cellulose or partially-purified celluloseInfo
- Publication number
- GB893334A GB893334A GB21859/58A GB2185958A GB893334A GB 893334 A GB893334 A GB 893334A GB 21859/58 A GB21859/58 A GB 21859/58A GB 2185958 A GB2185958 A GB 2185958A GB 893334 A GB893334 A GB 893334A
- Authority
- GB
- United Kingdom
- Prior art keywords
- liquor
- pipe
- digesting
- level
- chamber
- 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
Links
Classifications
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
- A24C5/00—Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
- A24C5/40—Hand-driven apparatus for making cigarettes
- A24C5/44—Pocket cigarette-rollers
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F13/00—Appliances for smoking cigars or cigarettes
- A24F13/02—Cigar or cigarette holders
- A24F13/12—Cigar or cigarette holders combined with other objects, e.g. writing utensils
-
- 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
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/10—Physical methods for facilitating impregnation
Landscapes
- Paper (AREA)
Abstract
In a continuous process for extracting non-cellulosic constituents from natural fibrous cellulosic material to produce purified cellulose, the cellulosic material to be purified, for example wood chips, is continuously introduced into a charging hopper 31, the lower end of which extends into digesting liquor contained in a feed tank 10 and into the mouth 16 of a pipe 15. The material, together with digesting liquor is drawn through the pipe 15 into the vacuum chamber 1 provided with a vacuum pump 7. Liquor is <PICT:0893334/IV (a)/1> withdrawn from the chamber 7 through the pipe 21 by the centrifugal pump 4 driven by the turbine 22 and electric motor 23, and discharged into the impregnating tower 22 at a rate sufficiently high to cause the concentration of cellulosic material in the liquor entering the chamber 1 to be relatively low and to maintain the height of the liquor in the chamber 1 at the level 8. In order that the period of resilience of the material in the chamber 1 may be relatively long the material entering the chamber is discharged into a receiver 32, the upper part of which is provided with apertures so that surplus liquor can escape into the chamber 1 and flow into the pipe 21. The fibrous material is continuously withdrawn from the bottom of the receiver 32 by a mechanically driven stirrer 36 and worm conveyed 37 at such a rate that the height of the material in the receiver remains about constant at the level 35. The material together with digesting liquor is pumped into the impregnation tower 22 in which the liquor is maintained at the level 9, liquor being continuously withdrawn from the tower 22 at an outlet 19 through the duct 18 into the feed tank 10. The fibrous material saturated with liquor is continuously raised by the mechanically driven worm conveyer 38 above the liquor level 9 and discharged into the pipe 6 down which the material falls into the digester 3, from which the digested fibrous material is continuously discharged through the delivery pipe 43 provided with gate valve 42. The height of the material in the digester is maintained at the level 40 and the material is brought to the required digesting temperature by the admission of steam through the pipe 41. Any condensate collecting above the level 9 of the digesting liquor in the tower 22 overflows through the outlet 44, pipe 45 and valve 46. Digesting liquor may be tapped off from the digesting liquor return pipe 18 to a tank 13 through a pipe 25 branching from the pipe 18 and provided with a valve 26. Fresh digesting liquor or a mixture thereof with liquor recycled from the impregnation tower 22 is fed through the control valve 11 and pipe 12 into the feed tank 10 to maintain the height of liquor in the latter at the level 14. Liquor from the tower 22 may be allowed to return to the tank 10 through the pipe 30 provided with a control valve 29 in order to prevent the temperature of the liquor in tank 10 from becoming too high.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE357964X | 1957-07-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB893334A true GB893334A (en) | 1962-04-04 |
Family
ID=6290711
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB21859/58A Expired GB893334A (en) | 1957-07-10 | 1958-07-08 | Improvements in the treatment of cellulosic fibrous materials for the production of purified cellulose or partially-purified cellulose |
Country Status (5)
Country | Link |
---|---|
US (1) | US2999784A (en) |
CH (1) | CH357964A (en) |
DE (1) | DE1070013B (en) |
FR (1) | FR1207629A (en) |
GB (1) | GB893334A (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1288900B (en) * | 1960-05-09 | 1969-02-06 | Improved Machinery Inc | Container for the treatment of crushed cellulosic solids |
US3278367A (en) * | 1963-02-14 | 1966-10-11 | Aqua Chem Inc | Method of producing wood pulp including steaming, vacuum, and impregnation |
US3259538A (en) * | 1963-04-22 | 1966-07-05 | Lummus Co | Comprehensive pulping system for producing paper pulp |
US3308011A (en) * | 1963-06-20 | 1967-03-07 | Beloit Corp | Steam digestion of impregnated chips |
SE300755B (en) * | 1964-04-16 | 1968-05-06 | Kamyr Ab | |
US3446701A (en) * | 1967-12-28 | 1969-05-27 | Us Agriculture | Apparatus for impregnating and chemically converting cellulose-containing materials |
FI80083C (en) * | 1988-02-08 | 1990-04-10 | Antti Aho | Method and apparatus for pre-treating cellulosic feedstock |
US5207870A (en) * | 1988-02-08 | 1993-05-04 | Osmo Aho | Process and equipment for pretreatment of cellulosic raw material |
US5496439A (en) * | 1993-07-28 | 1996-03-05 | Carlson; Willard E. | Recycle processing of baled waste material |
FI124553B (en) | 2012-07-11 | 2014-10-15 | Bln Woods Ltd Ab | A method for extracting biomass |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1773419A (en) * | 1926-06-03 | 1930-08-19 | Baker Webster E Byron | Sulphite wood pulp and method of making the same |
BE391267A (en) * | 1931-10-12 | |||
DE611226C (en) * | 1933-02-18 | 1935-03-23 | Metallgesellschaft Akt Ges | Process for opening up wood and other pulp-containing fiber material |
US2093267A (en) * | 1934-11-20 | 1937-09-14 | Chemipulp Process Inc | Treatment of fibrous material |
US2668110A (en) * | 1948-06-18 | 1954-02-02 | Spencer | Method for fiber liberation in cotton stalks and the pulp |
US2799579A (en) * | 1953-06-22 | 1957-07-16 | Hjalmar S Messing | Apparatus for presoaking lignocellulose material |
US2809111A (en) * | 1956-02-13 | 1957-10-08 | Condi Engineering Corp | Apparatus for wood chip digestion |
-
0
- DE DENDAT1070013D patent/DE1070013B/en active Pending
-
1958
- 1958-07-01 FR FR1207629D patent/FR1207629A/en not_active Expired
- 1958-07-02 CH CH357964D patent/CH357964A/en unknown
- 1958-07-07 US US746697A patent/US2999784A/en not_active Expired - Lifetime
- 1958-07-08 GB GB21859/58A patent/GB893334A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1207629A (en) | 1960-02-17 |
DE1070013B (en) | 1959-11-26 |
CH357964A (en) | 1961-10-31 |
US2999784A (en) | 1961-09-12 |
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