Process of producing high-yield pulp
AssigneeAkzo Nobel N.V.
InventorsKarin Susanne Maria Walter, Eva Linnea Elisabeth Wackerberg, Magnus Lars Paulsson
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for preparing a high-yield pulp comprising a) treating a lignocellulose containing material chemically by means of an oxidizing system comprising at least one non-enzymatic oxidant substantially free from ozone and chlorine dioxide and an activator at a pH from about 2 to about 6.5; and b) treating the lignocellulose containing material mechanically for a time sufficient to produce a high-yield pulp, wherein the lignocellulose containing material is chemically treated prior to and/or during any mechanical treatment stage, and wherein the lignocellulose containing material is not chemically treated at a pH from about 11.5 to about 14 between stages a) and b).
Claims19
A process for preparing a high-yield pulp for papermaking selected from mechanical pulp (MP), refiner mechanical pulp (RMP), pressurized refiner mechanical pulp (PRMP), thermomechanical pulp (TMP), thermomechanical chemical pulp (TMCP), high-temperature TMP (HT-TMP) RTS-TMP, Thermopulp, groundwood pulp (GW), stone groundwood pulp (SGW), pressure groundwood pulp (PGW), super pressure groundwood pulp (PGW-S), thermo groundwood pulp (TGW), thermo stone groundwood pulp (TSGW), chemimechanical pulp (CMP), chemirefinermechanical pulp (CRMP), chemithermomechanical pulp (CTMP), high-temperature CTMP (HT-CTMP), sulphite-modified thermomechanical pulp (SMTMP), reject CTMP (CTMPR), groundwood CTMP (G-CTMP), high-yield sulphite pulp (HYS), biomechanical pulp (BRMP), pulps produced according to the OPCO process, Bi-Vis process, dilution water sulfonation process (DWS), sulfonated long fibres process (SLF), chemically treated long fibres process (CTLF), long fibre CMP process (LFCMP) or any modifications and combinations thereof comprising
- a) treating a lignocellulose containing material selected from wood particles and/or fibers chemically by means of an oxidising system comprising at least one non-enzymatic oxidant selected from inorganic or organic peroxy compounds or hydrogen peroxide generating compounds substantially free from ozone and chlorine dioxide in an amount from about 0.1 to about 5 wt % based on the weight of the lignocellulose containing material and an activator in an amount from about 0.0001 to about 1 wt % based on the weight of the lignocellulose containing material at a pH from about 2 to about 6.5;
- and
- b) treating the lignocellulose containing material mechanically in at least two or more stages for a time sufficient to produce a high-yield pulp, wherein the energy input to said at least two or more stages is at least 1150 kWh/bdmt and up to about 5000 kWh/bdmt, wherein the lignocellulose containing material is chemically treated by adding the non-enzymatic oxidant and activator to the lignocellulose containing material prior to and/or during any mechanical treatment stage, and wherein the lignocellulose containing material is not chemically treated at a pH from about 11.5 to about 14 between stages a) and b), wherein the activator is selected from transition metal ions and wherein the lignocellulosic containing material is treated at a temperature from 80 to 180° C.
A process for preparing a high-yield pulp for papermaking selected from mechanical pulp (MP), refiner mechanical pulp (RMP), pressurized refiner mechanical pulp (PRMP), thermomechanical pulp (TMP), thermomechanical chemical pulp (TMCP), high-temperature TMP (HT-TMP) RTS-TMP, Thermopulp, groundwood pulp (GW), stone groundwood pulp (SGW), pressure groundwood pulp (PGW), super pressure groundwood pulp (PGW-S), thermo groundwood pulp (TGW), thermo stone groundwood pulp (TSGW), chemimechanical pulp (CMP), chemirefinermechanical pulp (CRMP), chemithermomechanical pulp (CTMP), high-temperature CTMP (HT-CTMP), sulphite-modified thermomechanical pulp (SMTMP), reject CTMP (CTMPR), groundwood CTMP (G-CTMP), high-yield sulphite pulp (HYS), biomechanical pulp (BRMP), pulps produced according to the OPCO process, Bi-Vis process, dilution water sulfonation process (DWS), sulfonated long fibres process (SLF), chemically treated long fibres process (CTLF), long fibre CMP process (LFCMP) or any modifications and combinations thereof comprising
- a) treating a lignocellulose containing material selected from wood particles and/or fibers chemically by means of an oxidising system comprising at least one non-enzymatic oxidant selected from inorganic or organic peroxy compounds or hydrogen peroxide generating compounds substantially free from ozone and chlorine dioxide in an amount from about 0.1 to about 5 wt % based on the weight of the lignocellulose containing material, an activator in an amount from about 0.0001 to about 0.1 wt % based on the weight of the lignocellulose containing material, and an enhancer selected from EDTA, DTPA, NTA, and combinations thereof in an amount from about 0.05 to about 0.3 wt % based on the weight of the lignocellulose containing material, at a pH from about 2 to about 6.5;
- and
- b) treating the lignocellulose containing material mechanically in at least two or more stages for a time sufficient to produce a high-yield pulp, wherein the energy input to said at least two stages is at least 1150 kWh/bdmt and up to about 5000 kWh/bdmt wherein the lignocellulose containing material is chemically treated by adding the non-enzymatic oxidant and activator to the lignocellulose containing material prior to and/or during any mechanical treatment stage, and wherein the lignocellulose containing material is not chemically treated at a pH from about 11.5 to about 14 between stages a) and b), wherein the activator is selected from transition metal ions, and wherein the lignocellulosic containing material is treated at a temperature from 80 to 180° C.
A process for preparing a high-yield pulp for papermaking selected from mechanical pulp (MP), refiner mechanical pulp (RMP), pressurized refiner mechanical pulp (PRMP), thermomechanical pulp (TMP), thermomechanical chemical pulp (TMCP), high-temperature TMP (HT-TMP) RTS-TMP, Thermopulp, groundwood pulp (GW), stone groundwood pulp (SGW), pressure groundwood pulp (PGW), super pressure groundwood pulp (PGW-S), thermo groundwood pulp (TGW), thermo stone groundwood pulp (TSGW), chemimechanical pulp (CMP), chemirefinermechanical pulp (CRMP), chemithermomechanical pulp (CTMP), high-temperature CTMP (HT-CTMP), sulphite-modified thermomechanical pulp (SMTMP), reject CTMP (CTMPR), groundwood CTMP (G-CTMP), high-yield sulphite pulp (HYS), biomechanical pulp (BRMP), pulps produced according to the OPCO process, Bi-Vis process, dilution water sulfonation process (DWS), sulfonated long fibres process (SLF), chemically treated long fibres process (CTLF), long fibre CMP process (LFCMP) or any modifications and combinations thereof comprising
- a) treating a lignocellulose containing material selected from wood particles and/or fibers chemically by means of an oxidising system comprising at least one non-enzymatic oxidant comprising hydrogen peroxide and being substantially free from ozone and chlorine dioxide in an amount from about 0.1 to about 5 wt % based on the weight of the lignocellulose containing material and an activator in an amount from about 0.0001 to about 1 wt % based on the weight of the lignocellulose containing material at a pH from about 2 to about 6.5;
- and
- b) treating the lignocellulose containing material mechanically in at least two or more stages for a time sufficient to produce a high-yield pulp wherein the energy input to said at least two stages is at least 1150 kWh/bdmt and up to about 5000 kWh/bdm, wherein the lignocellulose containing material is chemically treated by adding the non-enzymatic oxidant and activator to the lignocellulose containing material prior to and/or during any mechanical treatment stage, and wherein the lignocellulose containing material is not chemically treated at a pH from about 11.5 to about 14 between stages a) and b), wherein the activator is selected from transition metal ions, and wherein the lignocellulosic containing material is treated at a temperature from 80 to 180° C.
Dependencies are inferred from the claim text.