GB514191A - Process and apparatus for extracting cellulose from wood or other cellulosic material - Google Patents
Process and apparatus for extracting cellulose from wood or other cellulosic materialInfo
- Publication number
- GB514191A GB514191A GB37475/38A GB3747538A GB514191A GB 514191 A GB514191 A GB 514191A GB 37475/38 A GB37475/38 A GB 37475/38A GB 3747538 A GB3747538 A GB 3747538A GB 514191 A GB514191 A GB 514191A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lye
- boiler
- alkali
- water
- pipe
- 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
-
- 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
- D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching
- D21C9/083—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching with inorganic compounds
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
514,191. Refining cellulose materials. THURINGISCHE ZELLWOLLE AKT.-GES. Dec. 23, 1938, No. 37475. Convention date, Dec. 27, 1937. [Class 2 (ii)] Cellulose is extracted from wood or other cellulosic material by treating the material in a plurality of successive stages with dilute caustic alkali lye, or following the alkali treatment with water for washing, at a constant but adjustable pressure but at a temperature which is different at each stage. The water and/or lye flows continuously through successive batches of material undergoing different stages of treatment until the lye has acquired a sufficient concentration of salts, and alkali solution preferably in concentrated form is added between each stage so that the amount of alkali consumed in one stage is replaced before the lye passes to the next stage. The spent lye or the washing water containing sodium salts may be strengthened in alkali not by addition of alkali solution but by caustification, e.g. by treatment with calcium hydroxide. The water or lye passes from material in the finished or nearly finished condition, through material in earlier stages of treatment and finally through the raw material. The lye at each stage of treatment may contain about 20-30 grams per litre of NaOH. Cellulose suitable for viscose and artificial silk manufacture, is obtained by the process. Sulphite cellulose pulp may be further refined by subjecting it to the process described. As shown in Fig. 1, the cellulosic material is treated with alkali lye and water in closed boilers K1-9 provided with heaters V1-9 for the alkali or water which may be passed from one boiler to the next by way of ring pipe B. Alkali lye from supply pipe D may be introduced into the boilers through dosage pumps A. Water is supplied from a container E and pipe C under constant but adjustable pressure. Fig. 2 represents one stage of the process at which the material is being treated with alkali in boilers 5-9 and with water in boilers 3, 4. Boilers 3-9 are connected through valves j, o, p, and pre- 'heaters V (Fig. 1). Water for boiler 3 flows from pipe C and preheater V3, and alkali is added at A to each boiler 5-9, the lye, rich in dissolved salts, flowing from the last boiler 9 through valve m, pipe P, and valve N to a regenerating plant. When the material in boiler 2 is completely boiled and washed it is removed by pipe X. Boiler 1 is filled with raw material. When the density of the lye from boiler 9 falls below a determined value it is not sent to the recovery apparatus but is mixed with alkali through cock W and passed through pipe L and valve r to boiler 1 for treating a fresh batch of material. The quantity of lye removed from boiler 9 is replaced by an equal amount of fresh lye at boiler 5. As shown in Fig. 3, the material in boiler 5 is completely treated with alkali, the supply of which is stopped. When boiler 1 is filled with lye, boiler 5 is' supplied with water, and the lye from boiler 1 is passed to the regenerating device.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE514191X | 1937-12-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB514191A true GB514191A (en) | 1939-11-01 |
Family
ID=6548604
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB37475/38A Expired GB514191A (en) | 1937-12-27 | 1938-12-23 | Process and apparatus for extracting cellulose from wood or other cellulosic material |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE431860A (en) |
FR (1) | FR848039A (en) |
GB (1) | GB514191A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2675311A (en) * | 1948-08-09 | 1954-04-13 | John W Natwick | Paper pulp process and apparatus |
US2849315A (en) * | 1953-05-07 | 1958-08-26 | Haglund Gustaf | Digestion of wood |
-
0
- BE BE431860D patent/BE431860A/xx unknown
-
1938
- 1938-12-23 GB GB37475/38A patent/GB514191A/en not_active Expired
- 1938-12-27 FR FR848039D patent/FR848039A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR848039A (en) | 1939-10-20 |
BE431860A (en) |
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