US2193301A - Bleaching cellulose - Google Patents
Bleaching cellulose Download PDFInfo
- Publication number
- US2193301A US2193301A US220116A US22011638A US2193301A US 2193301 A US2193301 A US 2193301A US 220116 A US220116 A US 220116A US 22011638 A US22011638 A US 22011638A US 2193301 A US2193301 A US 2193301A
- Authority
- US
- United States
- Prior art keywords
- chlorine
- jet apparatus
- fibers
- cellulose
- bleaching
- 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
Links
- 229920002678 cellulose Polymers 0.000 title description 8
- 239000001913 cellulose Substances 0.000 title description 8
- 238000004061 bleaching Methods 0.000 title description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 11
- 229910052801 chlorine Inorganic materials 0.000 description 11
- 239000000460 chlorine Substances 0.000 description 11
- 239000000835 fiber Substances 0.000 description 10
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000012320 chlorinating reagent Substances 0.000 description 5
- 239000000725 suspension Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229920005610 lignin Polymers 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- -1 e. g. Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
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
Definitions
- This invention relates to a method of bleaching cellulosic fibers with chlorine and more particularly with chlorine gas.
- the defect of known methods consists essentially in that it is not possible to dose the chicrine so accurately, in respect of its time of action on the fibers, and to bring it so intimately into contact with the fibers, at the moment of the reaction, as to prevent the cellulose itself from being also attacked. Losses of and injuries to the cellulose consequently result.
- the fibers to be bleached e. g., wood pulp
- a carrier liquid e. g., water
- the concentration being from 1 to 3%
- the amountoi chlorine gas required for the chlorination is drawn into the jet apparatus under the action of the resulting reduced pressure.
- the chlorinated lignin is 6 removed by washing with water or dilute alkali.
- a supply line 8 is connected at l to the jet apparatus for the chlorine gas which is drawn by'suctlon go into the jet apparatus.
- the latter strictly speaking its diffusor, is containued by a pipe line 9.
- the action of the chlorine gas drawn in by the jet apparatus on the fibers starts in the diffuser and in this pipe line 9.
- tion chamber (not shown) may be connected to the line it.
- the suspension may be forced into and through the jet apparatus by a different device or arrangement, instead of a pump.
- chlorine- 30 containing liquids or other substances containing or yielding chlorine may be drawn in with the aid of the jet apparatus, instead of chlorinegas.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE841027X | 1937-07-23 | ||
| DEA772D DE948299C (de) | 1937-07-23 | 1938-10-28 | Verfahren und Vorrichtung zum Bleichen von Zellstoff |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2193301A true US2193301A (en) | 1940-03-12 |
Family
ID=25760429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US220116A Expired - Lifetime US2193301A (en) | 1937-07-23 | 1938-07-19 | Bleaching cellulose |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2193301A (de) |
| CH (2) | CH208757A (de) |
| DE (1) | DE948299C (de) |
| FR (2) | FR841027A (de) |
-
1938
- 1938-07-01 CH CH208757D patent/CH208757A/de unknown
- 1938-07-19 US US220116A patent/US2193301A/en not_active Expired - Lifetime
- 1938-07-22 FR FR841027D patent/FR841027A/fr not_active Expired
- 1938-10-28 DE DEA772D patent/DE948299C/de not_active Expired
-
1939
- 1939-09-27 CH CH215082D patent/CH215082A/de unknown
-
1941
- 1941-05-20 FR FR872300D patent/FR872300A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR872300A (fr) | 1942-06-05 |
| FR841027A (fr) | 1939-05-09 |
| CH208757A (de) | 1940-02-29 |
| DE948299C (de) | 1956-08-30 |
| CH215082A (de) | 1941-05-31 |
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