FR2194840B1 - - Google Patents
Info
- Publication number
- FR2194840B1 FR2194840B1 FR7327715A FR7327715A FR2194840B1 FR 2194840 B1 FR2194840 B1 FR 2194840B1 FR 7327715 A FR7327715 A FR 7327715A FR 7327715 A FR7327715 A FR 7327715A FR 2194840 B1 FR2194840 B1 FR 2194840B1
- Authority
- FR
- France
- 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
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/04—Pretreatment of the finely-divided materials before digesting with acid reacting compounds
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US27685372A | 1972-07-31 | 1972-07-31 | |
US00362009A US3841962A (en) | 1972-07-31 | 1973-05-21 | Hydrogen sulfide pretreatment of lignocellulosic materials in alkaline pulping processes |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2194840A1 FR2194840A1 (en) | 1974-03-01 |
FR2194840B1 true FR2194840B1 (en) | 1976-04-30 |
Family
ID=26958163
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7327715A Granted FR2194840A1 (en) | 1972-07-31 | 1973-07-27 | Hydrogen sulphide treatment of lignocellulosic materials - prior to alkaline digestion in pulp prodn. to eliminate loss of sulphur |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS5217121B2 (en) |
FI (1) | FI55693C (en) |
FR (1) | FR2194840A1 (en) |
NO (1) | NO137099C (en) |
SE (1) | SE389135B (en) |
-
1973
- 1973-07-25 SE SE7310326A patent/SE389135B/en unknown
- 1973-07-26 FI FI236673A patent/FI55693C/en active
- 1973-07-27 FR FR7327715A patent/FR2194840A1/en active Granted
- 1973-07-30 NO NO305173A patent/NO137099C/en unknown
- 1973-07-31 JP JP8556273A patent/JPS5217121B2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5217121B2 (en) | 1977-05-13 |
NO137099C (en) | 1977-12-28 |
FR2194840A1 (en) | 1974-03-01 |
JPS4992302A (en) | 1974-09-03 |
SE389135B (en) | 1976-10-25 |
FI55693B (en) | 1979-05-31 |
FI55693C (en) | 1979-09-10 |
NO137099B (en) | 1977-09-19 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |