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Journal articles
Transition metal complexes: a new class of laccase mediators for pulp bleaching, TAPPI JOURNAL, October 2000, Vol. 83(10)
Transition metal complexes: a new class of laccase mediators for pulp bleaching, TAPPI JOURNAL, October 2000, Vol. 83(10)
Journal articles
A virtuous circle, TAPPI JOURNAL, December 2000, Vol. 83(12)
A virtuous circle, TAPPI JOURNAL, December 2000, Vol. 83(12)
Journal articles
An engineered approach to paper and print improvement, TAPPI JOURNAL, December 2000, Vol. 83(12)
An engineered approach to paper and print improvement, TAPPI JOURNAL, December 2000, Vol. 83(12)
Journal articles
Biological destruction of haps for cluster rule compliance, TAPPI JOURNAL, December 2000, Vol. 83(12)
Biological destruction of haps for cluster rule compliance, TAPPI JOURNAL, December 2000, Vol. 83(12)
Journal articles
Calcium in pulping and bleaching, TAPPI JOURNAL, December 2000, Vol. 83(12)
Calcium in pulping and bleaching, TAPPI JOURNAL, December 2000, Vol. 83(12)
Journal articles
Deinking of newspaper assisted by steam explosion, TAPPI JOURNAL, December 2000, Vol. 83(12)
Deinking of newspaper assisted by steam explosion, TAPPI JOURNAL, December 2000, Vol. 83(12)
Journal articles
Direct causticization of kraft black liquor solids with tio2 in a fluidized bed, TAPPI JOURNAL, December 2000, Vol. 83(12)
Direct causticization of kraft black liquor solids with tio2 in a fluidized bed, TAPPI JOURNAL, December 2000, Vol. 83(12)
Journal articles
Wood quality ranking of plantation trees, TAPPI JOURNAL, December 2000, Vol. 83(12)
Wood quality ranking of plantation trees, TAPPI JOURNAL, December 2000, Vol. 83(12)
Journal articles
Magazine articles
Prehydrolysis kraft pulping of jute cutting and caddis mixture for rayon production
ABSTRACT: Jute cutting, jute caddis, and cutting-caddis mixtures were prehydrolyzed by varying time and temperature to get about 90% prehydrolyzed yield. At the conditions of 170°C for 60 min of prehydrolysis, the yield for 100% jute cutting was 76.3%, while the same for jute caddis was only 67.9%. But with prehydrolysis at 150°C for 60 min, the yield was 90% for jute cutting, where 49.94% of original pentosan was dissolved and prehydrolysis of jute caddis at 140°C in 60 min yielded 86.4% solid residue. Jute cutting-caddis mixed prehydrolysis was done at 140°C for 30 min and yielded 92% solid residue for 50:50 cutting-caddis mixtures, where pentosan dissolution was only 29%. Prehydrolyzed jute cutting, jute caddis, and cutting-caddis mixtures were subsequently kraft cooked. Pulp yield was only 40.9% for 100% jute cutting prehydrolyzed at 170°C for 60 min, which was 10.9% lower than the prehydrolysis at 140°C. For jute cutting-caddis mixed prehydrolysis at 140°C for 45 min followed by kraft cooking, pulp yield decreased by 3.3% from the 100% cutting to 50% caddis in the mixture, but 75% caddis in the mixture decreased pulp yield by 6.7%. The kappa number 50:50 cutting-caddis mixture was only 11.3. Pulp bleachability improved with increasing jute cutting proportion in the cutting-caddis mixture pulp.
Journal articles
Magazine articles
Lignin-based resins for kraft paper applications, TAPPI Journal November 2019
ABSTRACT: We investigated miscanthus (MS) and willow (W) lignin-furfural based resins as potential reinforce-ment agents on softwood and hardwood kraft paper. These resins might be sustainable alternatives to the commercial phenolformaldehyde (PF) resins. Phenol is a petrochemical product and formaldehyde has been classified as a carcinogen by the U.S. Environmental Protection Agency. The lignin used in this study was derived from hot water extraction (160ºC, 2 h) of MS and W biomass, and may be considered sulfur-free. These biorefinery lignins were characterized for their chemical composition and inherent properties via wet chemistry and instrumental techniques. The resin blends (MS-resin and W-resin) were characterized for their molecular weight, thermal behavior, and mechanical properties. Mechanical properties were measured by the resin’s ability to reinforce softwood and hard-wood kraft papers. The effect of adding hexamethylenetetramine (HMTA), a curing agent, to the resin was also examined. Mixtures of PF and lignin-based resins were investigated to further explore ways to reduce use of non-renewables, phenol, and carcinogenic formaldehyde. The results show that lignin-based resins have the potential to replace PF resins in kraft paper applications. For softwood paper, the highest strength was achieved using W-resin, without HMTA (2.5 times greater than PF with HMTA). For hardwood paper, MS-resin with HMTA gave the highest strength (2.3 times higher than PF with HMTA). The lignin-based resins, without HMTA, also yielded mechanical properties comparable to PF with HMTA.