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(12) Patent Application: | (11) CA 2238100 |
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(54) English Title: | PROCESS FOR PREPARING A PULP-COOKING SOLUTION |
(54) French Title: | PROCEDE DE PREPARATION D'UNE LIQUEUR DE CUISSON PERMETTANT D'OBTENIR UN PRODUIT SEMI-FINI FIBREUX |
Status: | Deemed Abandoned and Beyond the Period of Reinstatement - Pending Response to Notice of Disregarded Communication |
(51) International Patent Classification (IPC): |
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(72) Inventors : |
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(73) Owners : |
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(71) Applicants : |
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(74) Agent: | SMART & BIGGAR LP |
(74) Associate agent: | |
(45) Issued: | |
(86) PCT Filing Date: | 1996-11-13 |
(87) Open to Public Inspection: | 1997-03-29 |
Availability of licence: | N/A |
Dedicated to the Public: | N/A |
(25) Language of filing: | English |
Patent Cooperation Treaty (PCT): | Yes |
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(86) PCT Filing Number: | PCT/RU1996/000323 |
(87) International Publication Number: | RU1996000323 |
(85) National Entry: | 1998-05-20 |
(30) Application Priority Data: | ||||||
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The invention relates to the paper pulp industry, specifically to a process
for preparing a pulp cooking solution used for obtaining a fibrous semi-
finished product. This involves saturating a solution of sodium carbonate in
waste water obtained from the biological purification of paper industry
effluent with a concentration of surplus active sludge of 18-40 g/l, having a
sodium carbonate concentration of 1.55-2.5 wt.% in units of Na2O, or an
alkaline hydrolysate obtained by treating waste water obtained from the
biological purification of paper industry effluent with a concentration of
surplus active sludge of 18-40 g/l with a mixed base containing 50-90 wt.%
sodium carbonate and 10-50 % calcium oxide, in a quantity of 1.55-2.50 wt.%
per unit Na2O at a temperature of 25-40 ~C with subsequent removal of the
solid precipitate, at a temperature of 35-45 ~C until it accounts for 2.5-5.5
wt.% of the cooking mixture. The proposed process significantly increases the
yield of fibrous semi-finished product and improves its physical and
mechanical indicators. It also permits the use of waste obtained from the
biological purification of paper industry effluent and widens the range of raw
materials which can be used to produce pulp cooking solutions.
La présente invention se rapporte au domaine de la fabrication de pâte à papier, et concerne plus particulièrement un procédé de préparation d'une liqueur de cuisson permettant d'obtenir un produit semi-fini fibreux. Ce procédé consiste à saturer, à l'aide d'une quantité d'anhydride sulfureux variant de 2,5 à 5,5 % en poids de la liqueur de cuisson et à une température de 35 à 45· C, les produits suivants: (a) soit une solution de carbonate de sodium dans des eaux usées qui proviennent de la purification biologique d'effluents industriels issus de la production de pâte à papier, et qui possèdent une concentration en boues excédentaires actives allant de 18 à 40 g/l, ladite solution possédant une concentration en carbonate de sodium de 1,55 à 2,5 % en poids en unités Na¿2?O; (b) soit un hydrolysat alcalin obtenu par le traitement des eaux usées qui proviennent de la purification biologique d'effluents industriels issus de la production de pâte à papier, et qui possèdent une concentration en boues excédentaires actives allant de 18 à 40 g/l. Dans ce dernier cas, le traitement des eaux usées se fait à l'aide d'un mélange de base comprenant de 50 à 90 % en poids de carbonate de sodium et de 10 à 50 % en poids d'oxyde de calcium, ceci dans une quantité de 1,55 à 2,5 % en poids en unités Na¿2?O et à une température allant de 25 à 40· C, puis à éliminer le précipité solide qui s'est formé. Ce procédé permet d'accroître sensiblement la production du produit semi-fini fibreux, d'accroître son indice physico-mécanique, ainsi que d'utiliser les déchets issus de la purification biologique des eaux usées provenant de la production de pâte à papier, et d'étendre la gamme de matières premières utilisées dans la production de liqueurs de cuisson.
Note: Claims are shown in the official language in which they were submitted.
Note: Descriptions are shown in the official language in which they were submitted.
Sorry, the representative drawing for patent document number 2238100 was not found.
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Description | Date |
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Inactive: IPC from MCD | 2006-03-12 |
Inactive: IPC from MCD | 2006-03-12 |
Application Not Reinstated by Deadline | 2000-08-25 |
Inactive: Dead - No reply to Office letter | 2000-08-25 |
Deemed Abandoned - Failure to Respond to Maintenance Fee Notice | 1999-11-15 |
Inactive: Status info is complete as of Log entry date | 1999-10-19 |
Inactive: Abandoned - No reply to Office letter | 1999-08-25 |
Inactive: IPC assigned | 1998-09-16 |
Classification Modified | 1998-09-16 |
Inactive: First IPC assigned | 1998-09-16 |
Inactive: Courtesy letter - Evidence | 1998-08-04 |
Inactive: Notice - National entry - No RFE | 1998-08-03 |
Application Received - PCT | 1998-07-30 |
Application Published (Open to Public Inspection) | 1997-03-29 |
Abandonment Date | Reason | Reinstatement Date |
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1999-11-15 |
The last payment was received on 1998-11-09
Note : If the full payment has not been received on or before the date indicated, a further fee may be required which may be one of the following
Patent fees are adjusted on the 1st of January every year. The amounts above are the current amounts if received by December 31 of the current year.
Please refer to the CIPO
Patent Fees
web page to see all current fee amounts.
Fee Type | Anniversary Year | Due Date | Paid Date |
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Basic national fee - small | 1998-05-20 | ||
MF (application, 2nd anniv.) - small | 02 | 1998-11-13 | 1998-11-09 |
Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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VITALY VALERIEVICH PUKANOV |
VLADIMIR PAVLOVICH GROUDININE |
ALEXANDRE VLADIMIROVICH GROUDININE |
Past Owners on Record |
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None |