Ligno cellulosic materials and the products made therefrom
A process comprising treating a lignocellulosic material preferably pulp in the presence of a transition metal catalyst with a oxidizing agent selected from a group consisting of hydrogen peroxide, hypochlorite, hypochlorous acid and any combination thereof to form a treated lignocellulosic material having a viscosity equal to or less than about 17 cp and having reducing functional groups selected from the group consisting of aldehyde and aldehyde type functional groups at the C6 and C1 positions but predominating at the C1 position.
1. A process for preparing a fluff pulp comprising:
treating a lignocellulosic kraft pulp by adding from 0.005 to 1% by weight of the lignocellulosic kraft pulp of a catalyst consisting of a transition metal and/or salt thereof in the presence of from 0.5 to 5% peroxide by weight of the lignocellulosic kraft pulp at a pH from about 1 to about 9 to form a treated lignocellulosic kraft pulp; wherein the transition metal is selected from the group consisting of copper and a combination of copper and iron; wherein the treating is practiced as part of a pulping process prior to sheet formation, as part of a bleaching process prior to sheet formation, or as part of a re-slushing process prior to sheet formation; and wherein the process occurs without refining after said treating step.
2. The process according to claim 1 , wherein treating the lignocellulosic kraft pulp comprises adding from 0.005 to 0.1% by weight of the lignocellulosic kraft pulp of the catalyst.
3. The process of claim 1 , wherein the treated lignocellulosic kraft pulp has a viscosity equal to or less than about 10 cps.
4. The process according to claim 1 , wherein the peroxide is hydrogen peroxide.
5. The process according to claim 1 , wherein the pH is from 2 to 6.
6. The process according to claim 1 , wherein the transition metal is a combination of copper and iron.
7. The process of claim 1 , wherein the catalyst is a transition metal salt selected from the group consisting of a halide salt, a sulfate salt, a nitrate salt, a phosphate salt, a carbonate salt, and a combination of any two or more thereof.
8. The process according to claim 1 , wherein the catalyst consists of copper sulfate and optionally one or more of an iron salt and/or a copper salt.
9. The process of claim 1 , wherein the treated lignocellulosic kraft pulp has a viscosity from 2 cps to 7 cps.
10. The process of claim 1 , wherein the treating step occurs at a temperature ranging from 20° C. to 120° C.
11. The process of claim 1 , wherein
treating comprises oxidizing the lignocellulosic kraft pulp by adding 0.005% to 0.1% by weight of the lignocellulosic kraft pulp of the catalyst in the presence of from 0.5 to 5% by weight of the lignocellulosic kraft pulp of hydrogen peroxide at an acidic pH.
12. The process according to claim 11 , wherein the acidic pH is from 2 to 6.
13. The process according to claim 11 , wherein the catalyst is a copper salt or a combination of a copper salt and an iron salt.
14. The process according to claim 11 , wherein the catalyst consists of copper sulfate and optionally one or more of an iron salt and/or a copper salt.
15. The process according to claim 11 , wherein the oxidizing occurs at a temperature ranging from 40° C. to 90° C.
16. The process of claim 1 , wherein treating is practiced as a part of a bleaching process as a process step at the end of the bleaching process.