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公开(公告)号：ZA9710422B
公开(公告)日：1998-06-10
申请号：ZA9710422
申请日：1997-11-19
Applicant: SUNDS DEFIBRATOR IND AB
Inventor： BOKSTROM MONICA , HAGGQVIST JAN-ERIK
Abstract: Methods of controlling oxygen delignification processes are disclosed including providing chemicals for a first oxygen delignification step, conducting the first oxygen delignification step with the chemicals, conducting a second oxygen delignification step at a predetermined temperature to produce a delignified pulp, measuring the final kappa number of the delignified pulp subsequent to the second oxygen delignification step, adjusting the chemicals provided for the first oxygen delignification step based upon the difference between the actual kappa number reduction and the desired kappa number reduction for the pulp, and adjusting the predetermined temperature based on the chemicals provided to the first oxygen delignification step in order to provide the delignified pulp at a final pH of from about 10.5 to about 11.5.
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公开(公告)号：MY117900A
公开(公告)日：2004-08-30
申请号：MYPI9603947
申请日：1996-09-24
Applicant: SUNDS DEFIBRATOR IND AB
Inventor： BOKSTROM MONICA , NORDEN SOLVEIG , MELLANDER PIA
Abstract: A METHOD OF OXYGEN DELIGNIFICATION OF PULP FROM LIGNOCELLULOSIC MATERIAL AT MEDIUM CONCENTRATION IN TWO STEPS. AN EXTENDED DELIGNIFICATION IS OBTAINED IN THAT THE TEMPERATURE IN THE FIRST STEP IS HELD BELOW 90°C, THAT THE DIFFERENCE IN TEMPERATURE BETWEEN THE STEPS IS LOWER THAN 20°C. THE PRESSURE IN THE FIRST STEP IS 4-10 BAR AND IN THE SECOND STEP 2-5 BAR, AND THE PRESSURE IN THE FIRST STEP IS HIGHER THAN IN THE SECOND STEP. THE OXYGEN ADDITION TO THE FIRST STEP IS HIGH, 25-50 KG/TON PULP, THAT ALKALI IS ADDED ONLY TO THE FIRST STEP FOR OBTAINING HIGH ALKALINITY IN THE PULP, 25-50 KG ALKALI PER TON PULP. THE STAY-TIME IN THE FIRST STEP IS 10-30 MIN AND IN THE SECOND STEP 45-180 MIN.
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公开(公告)号：BR9713143A
公开(公告)日：2000-02-08
申请号：BR9713143
申请日：1997-11-06
Applicant: SUNDS DEFIBRATOR IND AB
Inventor： BOKSTROM MONICA , HOGGVIST JAN-ERIC
Abstract: Methods of controlling oxygen delignification processes are disclosed including providing chemicals for a first oxygen delignification step, conducting the first oxygen delignification step with the chemicals, conducting a second oxygen delignification step at a predetermined temperature to produce a delignified pulp, measuring the final kappa number of the delignified pulp subsequent to the second oxygen delignification step, adjusting the chemicals provided for the first oxygen delignification step based upon the difference between the actual kappa number reduction and the desired kappa number reduction for the pulp, and adjusting the predetermined temperature based on the chemicals provided to the first oxygen delignification step in order to provide the delignified pulp at a final pH of from about 10.5 to about 11.5.
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公开(公告)号：NZ320687A
公开(公告)日：1998-11-25
申请号：NZ32068796
申请日：1996-09-18
Applicant: SUNDS DEFIBRATOR IND AB
Inventor： BOKSTROM MONICA , MELLANDER PIA , NORDEN SOLVEIG
Abstract: Methods for oxygen delignification of a pulp are disclosed, including initially delignifying the pulp at a delignification temperature of less than 90° C., adding oxygen to the pulp so that the oxygen is present during the initial delignification step, and further delignifying the pulp at a delignification temperature of greater than 90° C., the difference between the two delignification temperatures being less than about 20° C., and the pressure being greater in the initial delignification step. The method also includes adding alkali solely to the initial delignification step in order to obtain high alkalinity therein.
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公开(公告)号：AU2312797A
公开(公告)日：1997-10-17
申请号：AU2312797
申请日：1997-03-07
Applicant: SUNDS DEFIBRATOR IND AB
Inventor： BOKSTROM MONICA , FORSLUND KJELL , LARSSON RUNE , SUNDIN MATTS
Abstract: Methods for oxygen delignification of chemical pulps are disclosed including contacting the chemical pulp with oxygen first in an upstream reactor vessel and then in a downstream reactor vessel. The upstream reactor vessel is maintained at pressures of greater than about 3 bar, and the downstream reactor vessel is maintained at temperatures of between about 90 and 120° C. and corresponding predetermined pressures. Heating of the partially delignified chemical pulp between the upstream and downstream reactors is accomplished by contacting the partially delignified chemical pulp with low pressure steam.
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Patent Agency Ranking
公开(公告)号：CA2231048C
公开(公告)日：2007-11-20
申请号：CA2231048
申请日：1996-09-18
Applicant: SUNDS DEFIBRATOR IND AB
Inventor： NORDEN SOLVEIG , MELLANDER PIA , BOKSTROM MONICA
Abstract: A method of oxygen delignification of pulp from lignocellulosic material at medium concentration in two steps. An extended delignification is obtained in that the temperature in the first step is hel d below 90 .degree.C, that the difference in temperature between the steps is lower than 20 .degree.C. The pressure in the first step is 4-10 bar and i n the second step 2-5 bar, and the pressure in the first step is higher than in the second step. The oxygen addition to the first step is high, 25-50 kg/ton pulp, that alkali is added only to the first step for obtaining high alkalinity in the pulp, 25-50 kg alkali per ton pulp. The stay-time in the first step is 10-30 min and in the second step 45-180 min.
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公开(公告)号：CA2270598C
公开(公告)日：2005-05-03
申请号：CA2270598
申请日：1997-11-06
Applicant: SUNDS DEFIBRATOR IND AB
Inventor： HAGGQVIST JAN-ERIC , BOKSTROM MONICA
Abstract: A method of controlling oxygen delignification of pulp, i.e. reduction of th e kappa number of the pulp, where the delignification is carried out in two stages, and the main portion of the chemicals required fo r the delignification is added to the first stage. The ingoing kappa number of the pulp prior to the delignification and the reduction of t he kappa number of the pulp during the total delignification in the two stages are used for adjusting the chemical addition to the first stage. The control is carried out so that higher ingoing kappa number yields lower charge and higher kappa number reduction yields higher charge, calculated per reduced kappa number unit. Said chemical addition to the first stage in its tum is used for control the temperature i n the second stage.
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公开(公告)号：AU691132B2
公开(公告)日：1998-05-07
申请号：AU7348396
申请日：1996-09-18
Applicant: SUNDS DEFIBRATOR IND AB
Inventor： BOKSTROM MONICA , MELLANDER PIA , NORDEN SOLVEIG
Abstract: Methods for oxygen delignification of a pulp are disclosed, including initially delignifying the pulp at a delignification temperature of less than 90° C., adding oxygen to the pulp so that the oxygen is present during the initial delignification step, and further delignifying the pulp at a delignification temperature of greater than 90° C., the difference between the two delignification temperatures being less than about 20° C., and the pressure being greater in the initial delignification step. The method also includes adding alkali solely to the initial delignification step in order to obtain high alkalinity therein.
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公开(公告)号：ZA9702337B
公开(公告)日：1997-09-17
申请号：ZA9702337
申请日：1997-03-18
Applicant: SUNDS DEFIBRATOR IND AB
Inventor： BOKSTROM MONICA , FORSLUND KJELL , LARSSON RUNE , SUNDIN MATTS
IPC: D21C20060101 , D21C9/147 , D21C
CPC classification number: Y02P70/24
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公开(公告)号：ZA967932B
公开(公告)日：1997-04-07
申请号：ZA967932
申请日：1996-09-19
Applicant: SUNDS DEFIBRATOR IND AB
Inventor： BOKSTROM MONICA , MELLANDER PIA , NORDEN SOLVEIG
Abstract: Methods for oxygen delignification of a pulp are disclosed, including initially delignifying the pulp at a delignification temperature of less than 90° C., adding oxygen to the pulp so that the oxygen is present during the initial delignification step, and further delignifying the pulp at a delignification temperature of greater than 90° C., the difference between the two delignification temperatures being less than about 20° C., and the pressure being greater in the initial delignification step. The method also includes adding alkali solely to the initial delignification step in order to obtain high alkalinity therein.
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