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(12) Patent: | (11) CA 1324865 |
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(21) Application Number: | 1324865 |
(54) English Title: | METHOD FOR RECOVERING CHEMICALS FROM SPENT PULP LIQUORS |
(54) French Title: | PROCEDE POUR LA RECUPERATION D'AGENTS CHIMIQUES PRESENTS DANS UNE LIQUEUR DE PULPE EPUISEE |
Status: | Term Expired - Post Grant |
(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: | MARKS & CLERK |
(74) Associate agent: | |
(45) Issued: | 1993-12-07 |
(22) Filed Date: | 1988-05-25 |
Availability of licence: | N/A |
Dedicated to the Public: | N/A |
(25) Language of filing: | English |
Patent Cooperation Treaty (PCT): | No |
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(30) Application Priority Data: | ||||||
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A b s t r a c t
In order to recover chemicals from spent pulp liquors
while at the same time making use of energy liberated in
the process, the spent liquors are supplied to the
reaction zone of a reactor while external thermal energy
independent of the combustion, is simultaneously supplied,
for instance, in the form of an energy-rich gas heated
in a plasma generator, the temperature and oxygen potential
in the zone being governed independently of each other by
the controlled supply of said thermal energy, and possibly
also the supply of carbonaceous material and/or gas
containing oxygen, so that substantially all alkali and
sulphur, i.e. 95 to 100% thereof, is bound in a molten
phase which is separated from the gas phase and withdrawn
via an outlet connected to the reactor, the organic portion
of the spent liquor being withdrawn in the form of a gas.
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 1324865 was not found.
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Please note that "Inactive:" events refers to events no longer in use in our new back-office solution.
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Description | Date |
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Inactive: Expired (old Act Patent) latest possible expiry date | 2010-12-07 |
Inactive: IPC from MCD | 2006-03-11 |
Inactive: IPC from MCD | 2006-03-11 |
Inactive: IPC from MCD | 2006-03-11 |
Inactive: Late MF processed | 2005-03-08 |
Letter Sent | 2004-12-07 |
Inactive: Late MF processed | 2003-12-05 |
Grant by Issuance | 1993-12-07 |
There is no abandonment history.
Fee Type | Anniversary Year | Due Date | Paid Date |
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MF (category 1, 4th anniv.) - standard | 1997-12-08 | 1997-12-05 | |
MF (category 1, 5th anniv.) - standard | 1998-12-07 | 1998-11-17 | |
MF (category 1, 6th anniv.) - standard | 1999-12-07 | 1999-11-12 | |
MF (category 1, 7th anniv.) - standard | 2000-12-07 | 2000-11-17 | |
MF (category 1, 8th anniv.) - standard | 2001-12-07 | 2001-11-20 | |
MF (category 1, 9th anniv.) - standard | 2002-12-09 | 2002-12-04 | |
MF (category 1, 10th anniv.) - standard | 2003-12-08 | 2003-12-05 | |
Reversal of deemed expiry | 2004-12-07 | 2005-03-08 | |
MF (category 1, 11th anniv.) - standard | 2004-12-07 | 2005-03-08 | |
MF (category 1, 12th anniv.) - standard | 2005-12-07 | 2005-11-24 | |
MF (category 1, 13th anniv.) - standard | 2006-12-07 | 2006-11-28 | |
MF (category 1, 14th anniv.) - standard | 2007-12-07 | 2007-11-23 | |
MF (category 1, 15th anniv.) - standard | 2008-12-08 | 2008-11-24 | |
MF (category 1, 16th anniv.) - standard | 2009-12-07 | 2009-11-26 |
Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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CHEMREC AKTIEBOLAG |
Past Owners on Record |
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LARS STIGSSON |
SVEN ERIKSSON |
SVEN SANTEN |