Claims
- 1. A method for deinking wastepaper comprising the steps of
i) pulping the wastepaper at a pH between 4 and 8.5 in the presence of deinking agent comprising a lipase and a fatty acid ester; and ii) removing the thereby dislodged ink particles.
- 2. A method according to claim 1, wherein the consistency in step i) is from about 0.5% to about 15%.
- 3. A method according to any of the preceding claims, wherein the wastepaper comprises old newspapers (ONP).
- 4. A method according to claim 3, wherein the amount of ONP constitutes at least 10% by weight of the total amount of wastepaper.
- 5. A method according to claim 4, wherein the wastepaper consists essentially of ONP.
- 6. A method according to any of claims 1-2, wherein the wastepaper comprises waste magazines (WM).
- 7. A method according to claim 6, wherein the amount of WM constitutes at least 10% by weight of the total amount of wastepaper.
- 8. A method according to claim 7, wherein the wastepaper consists essentially of WM.
- 9. A method according to any of claims 1-2, wherein the wastepaper comprises ONP and WM.
- 10. A method according to claim 9, wherein the wastepaper comprises 1-60% by weight of WM and 40-99% by weight of ONP.
- 11. A method according to any of the preceding claims, wherein the pulping with the deinking agent is carried out at a pH between 4.5 and 8.5.
- 12. A method according to any of the preceding claims, wherein the pulping with the deinking agent is carried out at a temperature from 25 to 75° C.
- 13. A method according to any of the preceding claims, wherein the fatty acid ester is a methyl ester, an ethyl ester, a n-propyl ester, an isopropyl ester, a n-butyl ester, an isobutyl ester, a sec-butyl ester, a tert-butyl ester, a monoglyceride, a diglyceride or a triglyceride of a C6-C22 fatty acid, the C6-C22 fatty acid being optionally substituted with one or more hydroxy, ethoxy, n-propoxy and/or isopropoxy groups.
- 14. A method according to any of claims 1-13, wherein the fatty acid ester is a C6-C22 fatty acid, which has been alkoxylated with ethylene oxide, propylene oxide, or a combination thereof.
- 15. A method according to claims 13 or 14, wherein the fatty acid moiety of the fatty acid ester is selected from the group consisting of caproic acid (6:0), enanthic cid (7:0), caprylic acid (8:0) pelargonic acid (9:0), capric acid (10:0) undecylenic acid (11:0), lauric acid (12:0), tridecylic acid (13:0), myristic acid (14:0), palmitic acid (16:0), stearic acid (18:0), palmitoleic acid (16:1), oleic acid (18:1), elaidic acid (18:1), ricinoleic acid (18:1), linoleic acid (18:2), linolenic acid (18:3) and mixture thereof.
- 16. A method according to claims 13 or 14, wherein the fatty acid moiety of the fatty acid ester is substituted with one or more ethoxy and/or isopropoxy groups.
- 17. A method according to claim 16, wherein fatty acid moiety of the fatty acid ester is substituted with ethoxy and isopropoxy groups of the general formulae
- 18. A method according to claim 17, wherein x is an integer in the range from 1 to 10, and y is an integer in the range from 1 to 5.
- 19. A method according to any of claims 14-18, wherein the fatty acid ester is a triglyceride.
- 20. A method according to claim 19, wherein the fatty acid ester is Hartaflot G-5000™.
- 21. A method according to any of the preceding claims, wherein the pulping step is carried out in the presence of a starch degrading enzyme.
- 22. A method according to claim 21, wherein the starch degrading enzyme is an amylase.
- 23. A method according to any of the preceding claims, wherein the pulping step is carried out in the presence of a cellulase.
- 24. A method according to claim 23, wherein the cellulase is a mono component cellulase.
- 25. A method according to claim 24, wherein the cellulase lacks a cellulose binding domain.
- 26. A method according to any of the preceding claims, wherein the lipase is added in an amount corresponding to 0.001-0.15% by weight of the dry pulp.
- 27. A method according to any of the preceding claims, wherein the fatty acid ester is added in an amount corresponding to 0.025-1% by weight of the dry pulp.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. application Ser. No. 10/050,489, filed Jan. 16, 2002, which claims the benefit of U.S. provisional application No. 60/261,784, filed on Jan. 16, 2001, the contents of which are hereby incorporated by reference.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60261784 |
Jan 2001 |
US |
Continuations (1)
|
Number |
Date |
Country |
Parent |
10050489 |
Jan 2002 |
US |
Child |
10686869 |
Oct 2003 |
US |