Presentation on theme: "Effects of Final Bleaching Stage Using Hydrogen Peroxide and Peracetic Acid (eq.) in the ECF Bleaching of Acacia D 0 E OP D 1 Kraft Pulps Presenter: Dede."— Presentation transcript:
Effects of Final Bleaching Stage Using Hydrogen Peroxide and Peracetic Acid (eq.) in the ECF Bleaching of Acacia D 0 E OP D 1 Kraft Pulps Presenter: Dede Ermawan (st110031) Adviser: Dr. Jiri Basta (Chairman) Dr. Mousa M. Nazhad Dr. Esa Lehtinen Presented on Master Theses Competetion, AIT, 16 th May 2011
Background Problem Typically ECF Bleaching O-D0-EOP-D 1 -D2 The high chemical charge result in high cost and high environmental load. Proposal Looking for chemical to reduce chemical consumption which more effective in final bleaching and less environmental load Objectives To optimize the existing process and reintroduce new agents to minimize the cost and environmental load To optimize D2 stage To examine new chemicals (P and PAA)
Properties of pulps Kind of Pulps Fiber MorphologyOptical PropertiesStrength Properties No. of Fibers (Mill./g) Average Length (mm) Coarseness (mg/m) Fines Content (%weight) Fiber Width ( µ m) Opacity s coefficient (m ² /kg) k coefficient (m ² /kg) Tear Index (mN.m 2 /g) Tensile Index (Nm/g) z-span Nm/g D2 Mill29.550.6300.0723.3417.4583.5055.070.164.6422.91120.0 A Final D27.230.6400.0773.2917.3083.0553.690.165.2223.88129.0 B Final D29.140.6400.0723.3217.3583.4654.150.165.0625.42132.0 C Final D28.260.6350.0753.2917.3583.2754.890.164.6924.71128.0 A Final P27.960.6350.0753.1517.2082.7454.430.175.4123.59125.0 B Final P28.740.6350.0733.2017.2082.7554.760.165.4024.44130.0 C Final P29.240.6350.0723.3117.3081.9251.330.175.6824.95123.0 A Final PAA/P29.880.6500.0693.17ND82.1052.340.165.2624.20123.0 B Final PAA/P28.740.6400.0733.28ND83.0153.440.165.7424.07123.0 B Final PAA29.340.6400.0713.18ND83.0354.380.164.8324.13122.0 Average28.810.6380.0733.2517.3182.8853.850.165.1924.23125.5 S. deviation0.800.0050.0020.070.090.531.200.000.390.714.0 Max29.880.6500.0773.3417.4583.5055.070.175.7425.42132.0 Min27.230.6300.0693.1517.2081.9251.330.164.6422.91120.0
Conclusions Some alternative method to produce 90% ISO brightness pulp had been investigated. Those are D 0 E OP D 1 D 2, D 0 E OP D 1 P, D 0 E OP D 1 PAA, D 0 E OP D 1 PAA/P Final Bleaching DPAA/P produce pulp which the best brightness stability, followed by DP, DPAA and DD respectively. Extractive content of DPAA/P pulp is the lowest, followed by DP, DPAA, and DD respectively. No major differences in morphology of fiber and strength properties of paper. Final bleaching of DD sequences produce lowest COD but higher SS and chloride content. While, DP and DPAA produce lower SS but higher COD, but it can be treated easily in the waste water treatment plant. DP and DPAA/P stages are significantly more expensive, while cost of DPAA maybe of interested when comparing with DD.