红麻皮硫酸盐浆的高白度无氯漂白

对红麻皮ＫＰ浆常规多段漂白及无氯多段漂白工艺与机理进行了对比研究。采用ＣＥＨＰ漂白，总用氯量４．９％，Ｈ２Ｏ２用量０．５％，可漂至８７．１％白度。采用ＺＥｐＺＰ无氯漂白，Ｚ漂白浓度在５０％为最佳，Ｏ３总用量１．７％，Ｈ２Ｏ２总用量１．５％，可漂至８７．２％白度，虽然纸浆粘度比前者低１２．６％，但其强度还略优于前者。ＩＲ分析表明：臭氧漂白引起纤维素结晶指数的降低比常规漂白大。ＦＴ－ＩＲ差谱分析证明了漂白过程中木素的溶出。

High Brightness TCF Bleaching of Kenaf Bast Kraft Pulp

Comparision of TCF bleaching of ZEpZP sequence and conventional bleaching of CEHP sequence of kenaf bast kraft pulp was studied. Brightness value of 87.1% could be obtained by CEHP bleaching with total chlorine charge of 4.9% and hydrogen peroxide charge of 0.5%; the same brightness could also be obtanined by ZEpZP bleaching when ozone bleaching stage was in 50% consistency and total ozone charge was 1.7%, and total hydrogen peroxide charge was 1.5% in Ep and P stages. Strength of TCF bleached pulp was superior to CEHP bleached pulp although the viscosity of former was 12.6% lower than that of later. IR analysis indicated that more serious reduction of cellulose crystallinity index was found in ozone stage,and FT-IR deconvoluted spectra illustrated clearly the removal of lignin in bleaching.