Low temperature pyrolysis offers a feasible option for wood waste management and the recovery of a variety of useful chemicals. The effect of Chromated Copper Arsenate (CCA) wood preservatives on the yield and composition of various pyrolysis products was investigated in the present research. A novel quantitative 31P NMR methodology has been developed to quantify levoglucosan and levoglucosenone from the pyrolysate of CCA-treated and untreated wood. The CCA treatment on wood had a significant effect on the amount of main carbohydrate derived degradation products of tar. In particular, a higher yield of levoglucosan can be obtained compared to that from untreated wood. Phosphoric acid has proven to be an efficient catalyst to favor levoglucosenone formation. The pyrolysis of CCA-treated wood in the presence of phosphoric acid gave rise to high yields of levoglucosenone, which demonstrated the potential for a new pathway in the rational use of CCA-treated wood waste. Pretreated wood with metal compounds has demonstrated that K2Cr2O7 and CuSO4 salts promote the formation of levoglucosan. The CrO3 treatment was found to favor the formation of levoglucosenone. A kinetic study of the pyrolysis of CCA-treated wood by thermogravimetric analysis has shown that CCA components have a significant influence on the thermal decomposition behavior of CCA-treated wood, which accelerate the weight loss of wood and the oxidation of the char.
| Identifer | oai:union.ndltd.org:NCSU/oai:NCSU:etd-12152006-062858 |
| Date | 15 December 2006 |
| Creators | FU, QIRONG |
| Contributors | Dimitris S. Argyropoulos |
| Publisher | NCSU |
| Source Sets | North Carolina State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://www.lib.ncsu.edu/theses/available/etd-12152006-062858/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dis sertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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