Process for increasing the refiner production rate and/or decreasing the specific energy of pulping wood
View Patent ↗The present invention relates to processes for enhancing a refiner's production rate and/or reducing the specific energy consumption for a freeness target through the use of lubricant(s) or carrier(s)/frictionizer(s), respectively.
1. A process for increasing the production rate and/or reducing specific energy of a refiner for a freeness target comprising:
(a2) applying a carrier/frictionizer solution to an amount of wood chips prior to delivery into a refining area; and
(b) delivering the wood chips to a refiner,
wherein the wood chips of step (a2) have a carrier/frictionizer dosage of about 0.05 to about 5 kg per metric ton of wood chips after application of the carrier/frictionizer solution.
2. The process according to claim 1 , wherein the carrier/frictionizer solution in step (a2) is applied to the wood chips by soaking, spraying or a combination thereof.
3. The process according to claim 1 , wherein the carrier/frictionizer solution in step (a2) contains a carrier, the carrier comprising at least one member of the group consisting of cationic guar gum, anionic guar gum, nonionic guar gum, amphoteric guar gum, cationic starch, cationic polyacrylamide, anionic polyacrylamide, nonionic polyacrylamide, nonionic polyethylene oxide, xanthan gum, mixtures of xanthan gum and at least one other carrier; and mixtures thereof.
4. The process according to claim 1 , wherein the carrier/frictionizer solution in step (a2) comprises a frictionizer, the frictionizer comprising at least one member of the group consisting of aluminum oxide, pumice, calcium metasilicate, nepheline syenite, silica, feldspar, aluminum trihydrate, glass beads, quartz, clay and mixtures thereof.
5. The process according to claim 4 , wherein the frictionizer comprises at least one member of the group consisting of pumice and calcium metasilicate.
6. The process according to claim 1 , wherein the carrier/frictionizer solution in step (a2) comprises a frictionizer having a MOHS hardness ranging from about 1 to about 9.
7. The process according to claim 6 , wherein the MOHS hardness ranges from about 2 to about 7.
8. The process according to claim 1 , wherein the carrier/frictionizer solution in step (a2) comprises a frictionizer having a particle size of about 1 to about 200 microns.
9. The process according to claim 8 , wherein the frictionizer particle size ranges from about 50 to about 150 microns.
10. The process according to claim 1 , wherein the carrier/frictionizer solution in step (a2) contains about 0.04 wt-% to about 15 wt-% of a carrier.
11. The process according to claim 1 , wherein the carrier/frictionizer contains a carrier and a frictionizer in a weight ratio of about 1:20 to about 1:3.
12. The process according to claim 1 , wherein the wood chips of step (a2) are soaked for a period ranging from about 1 second to about 10 minutes.
13. A process for reducing specific energy of a refiner for a freeness target comprising:
(1) delivering an amount of wood chips to a refiner; and
(2) applying a carrier/frictionizer solution to an amount of wood chips in a refining area wherein the wood chips have a carrier/frictionizer dosage of about 0.05 to about 5 kg per metric ton of wood chips after application of the carrier/frictionizer solution.
14. The process according to claim 13 , wherein the carrier/frictionizer solution is applied to the wood chips by soaking, spraying or a combination thereof.
15. The process according to claim 13 , wherein the carrier/frictionizer solution contains a carrier, the carrier comprising at least one member of the group consisting of cationic guar gum, anionic guar gum, nonionic guar gum, amphoteric guar gum, cationic starch, cationic polyacrylamide, anionic polyacrylamide, nonionic polyacrylamide, nonionic polyethylene oxide, xanthan gum, mixtures of xanthan gum and at least one other carrier; and mixtures thereof.
16. The process according to claim 13 , wherein the carrier/frictionizer solution comprises a frictionizer, the frictionizer comprising at least one member of the group consisting of aluminum oxide, pumice, calcium metasilicate, nepheline syenite, silica, feldspar, aluminum trihydrate, glass beads, quartz, clay and mixtures thereof.
17. The process according to claim 13 , wherein the carrier/frictionizer solution comprises a frictionizer having a MOHS hardness ranging from about 1 to about 9.
18. The process according to claim 13 , wherein the carrier/frictionizer solution comprises a frictionizer having a particle size of about 1 to about 200 microns.