微波预处理对桉木化机浆性能的影响

doi:10.3969/j.issn.0253-2417.2019.01.014

Abstract

Abstract:

The effects of microwave on the permeability of eucalyptus were studied by comparing the liquid absorption of wood chips under microwave with that under water bath. Under the same immersion conditions(NaOH 4% and mass fraction of wood chips 20%), the absorbed liquid quality of the microwave treated wood chips was significantly higher than that of the water bath. Microwave treatment for 5 minutes could reach the same absorbed liquid quality of 45 minutes in the water bath treatment, greatly improving the impregnation efficiency of wood chips. Then, microwave was used in the pre-impregnation of chemical mechanical pulping. The whiteness of the second stage bleaching pulp obtained by microwave impregnation could reach up to 68.9%(ISO), which was 3 - 6 percentage points higher than that of samples obtained by steaming impregnation. When the freeness of Canada was 305 mL, the tensile strength index could reach 19 N·m/g, the tear index could reach 2.15 mN·m²/g, and the bursting index could reach 0.8 kPa·m²/g. Furthermore, the tensile strength index was increased by 3 N·m/g on average, and the tear index was increased by about 0.2 mN·m²/g, while the bursting index was increased by about 0.1 kPa·m²/g.

Key words: microwave, eucalyptus, chemical mechanical pulp, impregnation

CLC Number:

TQ35

Lulu WEI,Yongjun DENG,Shanming HAN,Hongbin LI,Long LIANG,Guigan FANG. Effect of Microwave Pretreatment on Properties of Eucalyptus Chemical Mechanical Pulp[J]. Chemistry and Industry of Forest Products, 2019, 39(1): 95-100.

Figures/Tables 7

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References 19

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生产阶段 production stage	用药量reagent dosage/%				浆料质量分数/% mass fraction of pulp	温度¹⁾/℃ temp.	时间/mintime
生产阶段 production stage	H₂O₂	NaOH	Na₂SiO₃	DTPA	浆料质量分数/% mass fraction of pulp	温度¹⁾/℃ temp.	时间/mintime
一段预浸渍first stage pre-impregnation	8.0	4.0	2.0	0.5	30	90^*	5
二段漂白second stage bleaching	4.0	1.5	1.0	0.2	20	90	45

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Effect of Microwave Pretreatment on Properties of Eucalyptus Chemical Mechanical Pulp

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