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A kind of production method of hardwood high-yield pulp

A high-yield pulp and production method technology, which is applied in pulping of cellulose raw materials, textiles and papermaking, papermaking, etc., can solve the problems of low physical strength, poor durability, and easy yellowing of pulp, and achieve improved physical strength and Effects of optical performance, reduction of mechanical damage, and reduction of production cost

Active Publication Date: 2015-11-18
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High Yield Pulping (HYP, High Yield Pulping) is a pulping method that adopts chemical pretreatment and mechanical refining production process, mainly including APMP, CTMP, P-RCAPMP and BCTMP technologies. Its outstanding advantages are high pulp yield, Low pollution load, low investment, etc., but currently there are shortcomings such as high energy consumption in the refining section, low physical strength of pulp, easy yellowing, and poor durability. These shortcomings limit the further expansion of the application range of HYP pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The APMP (alkaline hydrogen peroxide mechanical pulping) process is used to produce poplar high-yield pulp. The production process is: 100kg poplar wood chips are steamed, one-stage extrusion, one-stage chemical impregnation, two-stage extrusion, two-stage chemical impregnation, One-stage refining, washing, two-stage refining, and latent pulping, one stage of chemical treatment: add 3.0kgNaOH, 3.2kgH 2 o 2 , 2kgNa 2 SiO 3 , 0.01kgMgSO 4 , 0.05kg ethylenediaminetetraacetic acid, the temperature is 50°C, the ratio of the wood mass to the volume of chemical solution A is 1:4, and the time is 60min. The second stage chemical treatment process conditions are: 2.4kgNaOH, 2.8kgH 2 o 2 , 2.0kgNa 2 SiO 3 , 0.01kgMgSO 4 , 0.05kg ethylenediaminetetraacetic acid, the temperature is 65°C, the ratio of the wood mass to the volume of chemical liquid A is 1:4, and the time is 40min. Afterwards, one-stage refining, washing, two-stage refining and delatency treatment are carried...

Embodiment 2

[0017] The conventional blasting method is used to produce eucalyptus high-yield pulp. The production process is as follows: 100kg of birch chips are first chemically treated, then blasting, first-stage refining, second-stage refining, washing, delamination, and then bleaching, washing and pulping. The pretreatment conditions are: 3.5kgNaOH, 12.0kgNa 2 SO 3 , the temperature is 140°C, the ratio of the wood mass to the volume of the chemical solution A is 1:4, the temperature is raised for 60 minutes, and the temperature is kept for 45 minutes. After the chemical treatment, the wood chips are treated by high-pressure blasting with a pressure of 1.8 MPa and a time of 5 minutes. The bleaching process conditions are: 4.0kgNaOH, 4.2kgH 2 o 2 , 3kgNa 2 SiO 3 , 0.05kgMgSO 4 , 0.3kg ethylenediaminetetraacetic acid, temperature 70°C, time 120min, slurry mass concentration 15%. Under the conditions of this treatment process, the beating degree of pulp obtained is 53.2OSR, the ener...

Embodiment 3

[0020] The conventional BCTMP (bleached chemical thermomechanical pulp) process is used to produce acacia high-yield pulp. The production process is as follows: poplar wood chips are first chemically treated, one-stage pressure refining, two-stage refining, and then washed, delaminated, and bleached. , and then washed and pulped. The chemical pretreatment conditions are: 2.5kgNaOH, 4.2kgNa 2 SO 3 , the temperature is 125°C, the ratio of the mass of wood to the volume of chemical liquid A is 1:4, the temperature is raised for 35 minutes, and the temperature is kept for 60 minutes. The bleaching process conditions are: 4.6kgNaOH, 4.8kgH 2 o 2 , 5.0kgNa 2 SiO 3 , 0.10kgMgSO 4 , 0.5kg ethylenediaminetetraacetic acid, temperature 80 ℃, slurry mass concentration 18%, time 150min. Under the conditions of this treatment process, the beating degree of pulp obtained is 52.2OSR, the energy consumption is 2145kW·h / t pulp, the whiteness is 78.6%ISO, and the bulk thickness is 2.12cm ...

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Abstract

The invention relates to the field of pulping and papermaking technology, especially to a production method for high-yield hardwood pulp. The production method for the high-yield hardwood pulp comprises the following steps: (1) chemical treatment; (2) pulp refining which is carried out after chemical treatment; and (3) washing and latency elimination: a step of subjecting pulp having undergone pulp refining to washing and latency elimination so as to obtain the high-yield hardwood pulp. The invention has the following beneficial effects: chemical pretreatment and explosion treatment are adopted to strengthen softening and separation of fibers, mechanical damage to the fibers is reduced, physical strength and optical performance of the pulp are improved, energy consumption in high yield pulping (HYP) is reduced, and production cost is decreased.

Description

(1) Technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to a production method of hardwood high-yield pulp. (2) Background technology [0002] Resource and environmental issues force the production of high-yield pulp to grow rapidly. Compared with chemical pulping, high-yield pulp has low construction cost, high pulp yield, and less pollution, and high-yield pulp has higher opacity, light scattering coefficient, bulk and good printability, etc. These advantages make high-yield pulp an indispensable pulp for low-weight coated paper, super-calendered paper, and newsprint. High Yield Pulping (HYP, High Yield Pulping) is a pulping method that adopts chemical pretreatment and mechanical refining production process, mainly including APMP, CTMP, P-RCAPMP and BCTMP technologies. Its outstanding advantages are high pulp yield, Low pollution load, low investment, etc., but currently there are shortcomings such as high energy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/22
Inventor 庞志强陈嘉川董翠华刘玉杨桂花王振
Owner QILU UNIV OF TECH