GB1396132A - Method of making semichemical pulp by means of an alkaline digesting liquid having as main constituents na2s and na2co3 - Google Patents
Method of making semichemical pulp by means of an alkaline digesting liquid having as main constituents na2s and na2co3Info
- Publication number
- GB1396132A GB1396132A GB2463472A GB2463472A GB1396132A GB 1396132 A GB1396132 A GB 1396132A GB 2463472 A GB2463472 A GB 2463472A GB 2463472 A GB2463472 A GB 2463472A GB 1396132 A GB1396132 A GB 1396132A
- Authority
- GB
- United Kingdom
- Prior art keywords
- liquor
- pulp
- vessel
- digesting
- smelt
- 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
- 239000007788 liquid Substances 0.000 title abstract 2
- 238000004519 manufacturing process Methods 0.000 title abstract 2
- 239000000470 constituent Substances 0.000 title 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract 4
- 241001062472 Stokellia anisodon Species 0.000 abstract 3
- 239000012978 lignocellulosic material Substances 0.000 abstract 2
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract 2
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 abstract 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 abstract 1
- 239000005864 Sulphur Substances 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 230000029087 digestion Effects 0.000 abstract 1
- 229910001882 dioxygen Inorganic materials 0.000 abstract 1
- 238000001704 evaporation Methods 0.000 abstract 1
- 230000008020 evaporation Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 239000002023 wood Substances 0.000 abstract 1
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
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/06—Treatment of pulp gases; Recovery of the heat content of the gases; Treatment of gases arising from various sources in pulp and paper mills; Regeneration of gaseous SO2, e.g. arising from liquors containing sulfur compounds
- D21C11/08—Deodorisation ; Elimination of malodorous compounds, e.g. sulfur compounds such as hydrogen sulfide or mercaptans, from gas streams
-
- 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
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0057—Oxidation of liquors, e.g. in order to reduce the losses of sulfur compounds, followed by evaporation or combustion if the liquor in question is a black liquor
Landscapes
- Paper (AREA)
Abstract
1396132 Pulp manufacture DEFIBRATOR AB 25 May 1972 [4 June 1971] 24634/ 72 Heading D2W Pulp is made from lignocellulosic material in a yield of 65-90% by impregnating the lignocellulosic material with a digesting liquor comprising sodium sulphide and sodium carbonate, digesting the impregnated material in the vapour phase in an atmosphere of steam at 159-190‹C, cooling the resulting pulp and liquor to not less than 100‹C, adding molecular oxygen sulphur compounds therefrom, separating the pulp from the liquor, and recovering chemicals from the liquor. The latter step is carried out by concentrating the liquor by evaporation, and burning the concentrated liquor to yield a smelt consisting substantially of sodium sulphide and sodium carbonate, and dissolving the smelt in water to form fresh digesting liquor. As shown, wood chips are fed via conveyor 1 into a vessel 2 in which they steamed and then into a digester 7. The digesting liquid is supplied to the vessel via pipe 47 and steam via pipe 17. Digested chips and liquor are then fed into vessel 10 which is supplied with compressed air via line 12 from compressor 13, and subsequently blown therefrom into a centrifugal cleaner 20. Pulp removed from the bottom of the cleaner is defibrated by difibrator 25 and passed to a filter 26 for separation of liquor, liquor recovered in tank 28 is concentrated in evaporator 43, and burnt in furnace 44. The smelt obtained is dissolved in tank 45 and the fresh digestion liquor recirculated via line 47. The digested chips may be cooled during thier transfer from digester 7 to vessel 10 by using a watercooled conveyor.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE729371A SE350078B (en) | 1971-06-04 | 1971-06-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1396132A true GB1396132A (en) | 1975-06-04 |
Family
ID=20270971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2463472A Expired GB1396132A (en) | 1971-06-04 | 1972-05-25 | Method of making semichemical pulp by means of an alkaline digesting liquid having as main constituents na2s and na2co3 |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5335601B1 (en) |
| CA (1) | CA994961A (en) |
| DE (1) | DE2226777C3 (en) |
| FR (1) | FR2140222A1 (en) |
| GB (1) | GB1396132A (en) |
| SE (1) | SE350078B (en) |
-
1971
- 1971-06-04 SE SE729371A patent/SE350078B/xx unknown
-
1972
- 1972-05-25 GB GB2463472A patent/GB1396132A/en not_active Expired
- 1972-06-02 DE DE19722226777 patent/DE2226777C3/en not_active Expired
- 1972-06-02 CA CA143,743A patent/CA994961A/en not_active Expired
- 1972-06-02 FR FR7220001A patent/FR2140222A1/fr not_active Withdrawn
- 1972-06-03 JP JP5480572A patent/JPS5335601B1/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE2226777B2 (en) | 1974-08-29 |
| DE2226777C3 (en) | 1975-04-10 |
| CA994961A (en) | 1976-08-17 |
| FR2140222A1 (en) | 1973-01-12 |
| SE350078B (en) | 1972-10-16 |
| DE2226777A1 (en) | 1973-02-08 |
| JPS5335601B1 (en) | 1978-09-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |