Method for reducing energy consumption during wet refining of mechanical pulp

A mechanical pulping and refining technology, applied in pulp beating/refining methods, textiles and papermaking, fiber raw material treatment, etc., can solve the problems of high energy consumption for refining, poor whiteness stability, and low physical strength of pulping

Inactive Publication Date: 2008-02-27
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the energy consumption of the refining section of mechanical pulping technology is very large. For example, the refining energy consumption of TMP (thermomechanical pulp) is 1800-2300kW h/t pulp, and the refining energy of RMP (wood chip mechanical pulp) The consumption of pulp is 1600-2200kW·h/t, and the physical strength of pulp is low, and the stability of whiteness is poor. These shortcomings limit the further development of mechanical pulp production
The existing refining theory b...

Method used

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  • Method for reducing energy consumption during wet refining of mechanical pulp

Examples

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Effect test

Embodiment 1

[0053] The refining energy consumption of conventional masson pine thermomechanical pulp (TMP) is 1350kW·h / t pulp, and the beating degree of pulp after refining is 50.2 0 SR, fiber bundle content 6.3%, bulk 2.73cm 3 g -1 , whiteness 45.7% ISO, burst index 1.26KPa m 2 g -1 , Fracture length 3.21km, tear index 2.45mN m 2 g -1 .

[0054] Adopt this method to produce masson pine TMP, carry out laccase treatment after the rough refining section, the treatment conditions are laccase dosage 32IU / g pulp, temperature 40 ℃, time 60min, pulp concentration 5%, pH value 5.0~7.5, After the treatment, the slurry is concentrated to a pulp concentration of 25%, and then finely refined. The energy consumption of refining in the refining section is 999kW·h / t pulp, and the energy consumption of refining is reduced by 26.0%. The beating degree of pulp is 50.8 0 SR, 5.0% tow content, 1.3% lower, bulk 2.65cm 3 g -1 , whiteness 47.1% ISO, burst index 1.34KPa m 2 g -1 , Fracture length 3.47...

Embodiment 2

[0056] The refining energy consumption of conventional eucalyptus bleached chemical thermomechanical pulp (BCTMP) is 1230kW·h / t pulp, and the beating degree of pulp after refining is 50.2 0 SR, fiber bundle content 6.1%, bulk 2.35cm 3 g -1 , whiteness 78.1% ISO, burst index 2.56KPa m 2 g -1 , Fracture length 4.54km, tear index 5.45mN m 2 g -1 . The ratio of producing newsprint eucalyptus BCTMP is 45%, and the ratio of deinking pulp is 55%.

[0057] Eucalyptus CTMP is prepared by this method, and xylanase treatment is carried out after the rough refining section. The treatment conditions are xylanase dosage 40IU / g pulp, temperature 50°C, time 60min, pulp concentration 8%, pH value 6 to 8. After the treatment, the pulp is concentrated to a pulp concentration of 25%, and then finely refined. The energy consumption of pulp in the fine grinding section is 929kW·h / t pulp, and the energy consumption of pulp is reduced by 24.5%. After fine grinding The beating degree of the ref...

Embodiment 3

[0059] The refining energy consumption of conventional poplar alkaline hydrogen peroxide mechanical pulp (APMP) is 960kW·h / t pulp, and the beating degree of pulp after refining is 48.5 0 SR, fiber bundle content 5.2%, bulk 2.23cm 3 g -1 , whiteness 77.3% ISO, burst index 2.35KPa m 2 g -1 , Fracture length 4.31km, tear index 5.33mN m 2 g -1 . The ratio of poplar APMP to produce low basis weight coated paper is 80%, and the ratio of bleached kraft pulp is 20%.

[0060] Adopt this method to prepare poplar APMP, carry out white rot fungus crude enzyme solution treatment after the rough refining section, the treatment condition is enzyme solution dosage 6ml / kg pulp, temperature 40 ℃, time 60min, pulp concentration 6%, pH value 5.0~7.0, after the treatment, the pulp is concentrated to a pulp concentration of 25%, and then finely refined. The beating degree of the refined pulp is 49.1 0 SR, 4.1% tow content, 1.1% lower, bulk 2.09cm 3 g -1 , whiteness 79.2% ISO, burst index ...

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Abstract

The present invention relates to a method for reducing pulp-grinding energy dissipation of refine grinding stage by using enzyme treatment. Said invention adopts the following steps: adding hydrolytic enzyme into the coarse-ground pulp material, regulating pH value to 5.0-8, temperature is 25-60deg.C, pulp concentration is 6-15% and reaction time is 30-90min, then conveying the pulp material into a pulp-grinding machine to make refine-grinding operation. The described hydrolytic enzyme is one kind or two kinds of xylanase, laccase and white pot enzyme, etc.

Description

(1) Technical field [0001] The invention relates to a production method for reducing energy consumption in the refining section of mechanical pulp, in particular to a method for reducing energy consumption in the refining section by enzymatic treatment. (2) Background technology [0002] Pulp and paper making is a capital, energy and technology-intensive industry. The pulp used mainly includes chemical pulp and mechanical pulp. At present, resource and environmental problems force the production of mechanical pulp to increase rapidly. Compared with chemical pulping, mechanical pulping has low construction cost, high pulp yield and less pollution, and mechanical pulp has the advantages of high opacity, light scattering coefficient, bulk and good printability, etc. These advantages make mechanical pulp an indispensable pulp for low-weight coated paper, super-calendered paper, and newsprint. However, at present, the energy consumption of the refining section of mechanical pul...

Claims

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Application Information

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IPC IPC(8): D21D1/20C12S3/08
Inventor 陈嘉川庞志强杨桂花
Owner QILU UNIV OF TECH
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