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: (a1) applying a lubricant 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 (a1) have a lubricant dosage of from about 0.1 to about 6 pounds of lubricant per ton of wood chips after application of the lubricant solution.
2. The process according to claim 1 , wherein the lubricant solution in step (a1) is applied to the wood chips by soaking, spraying or a combination thereof.
3. The process according to claim 2 , wherein the wood chips of step (a1) are soaked for a period ranging from about 1 second to about 10 minutes.
4. The process according to claim 3 , wherein the wood chips of step (a1) are soaked for about 30 seconds to about 5 minutes.
5. The process according to claim 4 , wherein the wood chips of step (a1) are soaked for about 1 minute.
6. The process according to claim 1 , wherein the lubricant solution in step (a1) is selected from the group consisting of cationic guar gum, cationic starch, cationic polyacrylamide, nonionic polyethylene oxide, mixtures of xanthan gum and at least one other lubricant; and mixtures thereof.
7. The process according to claim 6 , wherein the lubricant solution in step (a1) comprises cationic guar gum.
8. The process according to claim 6 , wherein the mixtures of xanthan gum and at least one other lubricant are in a weight ratio ranging from about 10:1 to about 1:10.
9. The process according to claim 8 , wherein the weight ratio ranges from about 5:1 to about 1:5.
10. The process according to claim 9 , wherein the weight ratio is about 1:1.
11. The process according to claim 1 , wherein the lubricant solution in step (a1) contains about 0.04 wt-% to about 15 wt-% of a lubricant.
12. The process according to claim 11 , wherein the lubricant solution in step (a1) contains about 0.06 wt-% to about 9 wt-% of the lubricant.
13. The process according to claim 12 , wherein the lubricant solution in step (a1) contains about 0.06 wt-% to about 2 wt-% of the lubricant.
14. The process according to claim 13 , wherein the lubricant solution in step (a1) contains about 1.0 wt-% of the lubricant.
15. The process according to claim 1 , wherein the lubricant dosage ranges from about 0.25 to about 4 pounds of lubricant per ton of wood chips after application of the lubricant solution.
16. The process according to claim 15 , wherein the lubricant dosage ranges from about 0.5 pounds of lubricant per ton of wood chips after application of the lubricant solution.