ASPECTS OF OPTIMIZATION OF TMP BLEACHING WITH HYDROGEN PEROXIDE
Magnesium-based alkalis and the Chelants (Sodium Citrate, Opal and tetra acetyl ethylene diamine (TAED)) for hydrogen peroxide bleaching of aspen TMP were investigated in this paper. The dosage of Mg(OH)2 instead of NaOH, Sodium Citrate dosage, Opal dosage, TAED dosage, reaction temperature and reaction time were the primary variables evaluated. The results showed that the optimal conditions of hydrogen peroxide bleaching of aspen TMP were as follows: H2O2 3％, temperature 60 , time 90 m ℃ inutes, consistence of pulp 20％, pH 11.0, Mg(OH)2: NaOH=25％, Na2SiO3 4％, MgSO4 0.05％ , Sodium Citrate 1％, Opal 1％ and TAED:H2O2=0.5. Under the optimum conditions, the brightness of aspen TMP can be enhanced from 30.4％ ISO to 60.8％ ISO, and the increment of brightness was 30.4％ ISO, while the brightness of bleached pulp by using the NaOH as the alkali source was lower than by using Mg(OH)2-based alkalis. Compared with DTPA, the brightness could reach the same level and had lower cost at the same time of using the Sodium Citrate and Opal for hydrogen peroxide bleaching. Meanwhile, the addition of TAED in hydrogen peroxide bleaching of TPM resulted in a higher brightness of the pulp while it could be carried out at a lower temperature and in a shorter reaction time, compared with the conventional hydrogen peroxide bleaching process.
Magnesium-based alkalis Sodium Citrate Opal TAED hydrogen peroxide bleaching
Peiyi Li Meiyun Zhang Xinxing Xia Shunxi Song Ang Gao Shiyou Ma
School of Papermaking Engineering,Shaanxi University of Science and Technology,Xian, 710021, China
国际会议
International Mechanical Pulping Conference 2011(2011国际机械浆学术会议)
西安
英文
310-313
2011-06-26（万方平台首次上网日期，不代表论文的发表时间）