CN100487192C

CN100487192C - Biological treatment method of non-wood pulp

Info

Publication number: CN100487192C
Application number: CNB2006100689005A
Authority: CN
Inventors: 秦梦华; 李宗全; 傅英娟; 魏琳
Original assignee: Shandong Institute of Light Industry
Current assignee: Shandong Institute of Light Industry
Priority date: 2006-09-20
Filing date: 2006-09-20
Publication date: 2009-05-13
Anticipated expiration: 2026-09-20
Also published as: CN1924188A

Abstract

This invention relates to non-wood paper pastry biological process method, which comprises the following steps: adding enzyme into paper pastry before beating pastry with enzyme as 10-500g/ton, pastry concentration for 3-20 percentage, temperature for 20 to 60 degrees, time for 0.5 to 4 hours, pH 5.0 to 8.5, wherein, the said enzyme is of fiber enzyme or semi-fiber enzyme. This invention adopts fiber enzyme or semi-fiber enzyme to process non-wood pastry to add brooming in beating pastry process.

Description

Biological treatment method of non-wood pulp

(1) technical field

The present invention relates to a kind of biological treatment method of non-wood pulp, be specifically related to the method for straw pulp enzyme modification, belong to the pulp and paper technology field.

(2) background technology

Because the shortage of China's wood raw material, non-wood material such as bamboo, reed, bagasse, wheat straw etc. are used for pulping and paper-making in a large number.Compare with wood pulp, straw pulp heteroproteose cell content height, fiber weak point, physical strength is low.When straw pulp was used for producing, making beating was the important step that influences straw pulp performance.For the making beating of straw pulp,, should keep the length of fiber when therefore pulling an oar as far as possible and promote the wire-dividing broom purification of fiber because fiber itself length is shorter.In general, remaining hemicellulose helps the making beating of paper pulp in the paper pulp, and this is because hemicellulose rises than the easier aquation profit of cellulose, and the fibrillating that the profit of fiber rises for fiber is very favourable.The contained hemicellulose of some non-wood pulps such as Straw Pulp, reed pulp is than high many of wood pulp, but this class paper pulp is because the hemicellulose level height, the aquation profit rises very fast when making beating, just reduced the freedom of paper pulp before the proper intensity in performance, that the paper of producing with this paper pulp is prone to is transparent, embrittlement and the low defect of intensity.

Making beating for wood pulp, there are many researchers to adopt biology enzyme to carrying out preliminary treatment before the sulfate wood pulp making beating, enzyme is handled the initial stage, the hemicellulose of fiber surface decomposes, improved the fiber surface suction and moistened the degree that rises, also improved the permeability of fiber surface simultaneously, promoted the enzyme molecular diffusion, be penetrated into fibrous inside, make that hemicellulose is degraded between microfibre, further promoted the fiber profit to rise.If the use hemicellulase is abolished the associative key between LCC, open passage, allow cellulase act on the fiber surface generation and suitably peel off effect, P layer and S1 layer are abolished, make the S2 layer expose out just and do not suffer damage, the accelerating fibers fibrillating then can promote making beating under the situation of not losing the pulp strength performance, thereby saves beating energy consumption.

As far back as five, sixties enzyme modification paper pulp just is applied to reducing the research of beating energy consumption.The people such as exerted in 1986 and reported the enzyme process making beating effect of zytase bleach chemical pulp.Referring to the people such as exerting, zytase is to the effect of chemical pulp fiber, wood chemistry, 6 (2): 167,1986 (No é, P.et al., Action of xylanases on chemical pulp fibers.J WoodChem.Technol., 6 (2): 167,1986).Many in recent years researchers find that add enzyme before the making beating, beating energy consumption obviously reduces when research enzyme modification needlebush Pulp Drainage Properties.

Straw pulp contains the tiny component and the high-load hemicellulose of the tiny component ratio of a high proportion of non-fiber, makes the straw pulp fiber excessively moisten to rise and causes drainability poor, and therefore, the enzyme modification of straw pulp is mainly used in and improves on its drainability.The use biology enzyme is untied the connection between xylan and the cellulose in the enzyme modification of straw pulp, improves the water filtering performance of paper pulp.It is generally acknowledged that as long as the control proper reaction conditions, enzyme is handled can not cause the variation that physical strength is big, and too much enzyme dosage and long reaction time all can be caused the decline greatly of pulp strength.

From present research situation, adopt suitable biology enzyme to handle straw pulp after, the drainability of paper pulp increases.But also do not utilize enzyme to handle the technology that the physical property of improving paper pulp reduces beating energy consumption simultaneously at present, therefore, a kind of beatability that can improve non-wood pulp of exploitation biologic treating technique that can improve the non-wood pulp strength character simultaneously to its on fine paper application and reduce production costs significant.

(3) summary of the invention

The present invention is directed to the present situation of the effect that the making beating of present non-wood pulp is difficult to reach good, a kind of novel non-wood pulp bioremediation is provided, promptly the method for straw pulp enzyme modification reduces beating energy consumption in the physical property that improves straw pulp.

Non-wood pulp bioremediation of the present invention briefly is called the enzyme modification technology, and step is as follows:

Add enzyme in the paper pulp before making beating and handle, enzyme dosage is 10-500g/ ton slurry, starch dense 3-20%, 20-60 ℃ of temperature, time 0.5-4.0h, pH5.0-8.5.Described enzyme is one of cellulase or hemicellulase or combination.

Described non-wood pulp is the brown stock or the bleached pulp of Straw Pulp, reed pulp, bagasse pulp, bamboo pulp and cotton pulp.

Preferably, above-mentioned enzyme dosage is 150-250g/ ton slurry.

Preferably, described hemicellulase is that Novozymes Company produces hemicellulase Pulpzymes HC, and cellulase is selected from one or both among the cellulase-producing Nozymes342 of Novozymes Company, the cellulase Nozymes51064.

Preferably, above-mentioned cellulase or hemicellulase add in paper pulp size degradation process or directly join in the paper pulp of fresh undried.

Paper pulp after enzyme of the present invention is handled can adopt mill or other beating equipments to pull an oar.

Adopt the inventive method to carry out enzyme before the pulp beating and handle, can improve the physical strength of making beating back paper pulp, significantly reduce beating energy consumption simultaneously.

Compared with prior art, characteristics of the present invention are:

In the prior art non-wood pulp especially the problem that exists of straw pulp making beating be mainly to be that the fiber wire-dividing broom purification is few, in the pulping process when fiber be cut off more and wire-dividing broom purification more after a little while, the intensity decreases of fiber, interfibrous adhesion reduces, and causes the intensity decreases of paper pulp.Simultaneously, general enzyme is handled the decline that can cause pulp strength when improving the making beating characteristic.The method of non-wood pulp enzyme modification of the present invention, by choosing and appropriate enzyme dosage of suitable enzymes, before pulp beating, adopt enzyme to handle, can increase the wire-dividing broom purification of the fiber in the pulping process, thereby improve the physical strength of making beating back paper pulp, simultaneously can reduce beating time, reduce beating energy consumption.

Existing enzyme modification technology, the general water filtering performance that just improves straw pulp, the present invention adopts cellulase or hemicellulase to handle non-wood pulp, can increase the wire-dividing broom purification of fiber in the pulping process, compare with the paper pulp of handling without enzyme, improve interfibrous adhesion, significantly reducing beating energy consumption when improving the physical strength of paper pulp.

(4) specific embodiment

Used enzyme is that Novozymes Company produces hemicellulase Pulpzymes HC, cellulase Nozymes51064 and cellulase Nozymes342 among the following embodiment.

Embodiment 1:

Bleached sulphate bamboo pulp, the dense size degradation down of 3-5% slurry in the hydrabrusher, the mixture that adds the 1:1 weight ratio of hemicellulase Pulpzymes HC and Nozymes51064 in the size degradation process, the enzyme addition is 250g/ ton slurry, size degradation 8 minutes, at 40-55 ℃, the following 0.5-2.0h that handles of pH6.0-8.0 uses the disc mill defibrination dense time at the slurry of 3%-4% then then.40-60 ° of SR of pulp beating degree compares with the paper pulp of not enzyme-added processing behind the defibrination, and after the enzyme-added processing making beating, under same beating degree, tensile strength improves 10%, and bursting strength improves 15%, and beating time reduces by 20% (energy consumption reduction) simultaneously.

Embodiment 2:

Reed sulfate bleached pulp, the dense size degradation down of 3-5% slurry in the hydrabrusher, the mixture that adds the 1:1 weight ratio of hemicellulase Pulpzymes HC and cellulase Nozymes51064 in the size degradation process, the enzyme addition is 200g/ ton slurry, size degradation 8 minutes, at 30-55 ℃, the following 0.5-2.0h that handles of pH6.0-8.0 uses the disc mill defibrination dense time at the slurry of 3.0-4.0% then then.50-55 ° of SR of pulp beating degree behind the defibrination compare with the paper pulp of not enzyme-added processing, and after the enzyme-added processing making beating, under same beating degree, tensile strength improves 10%, and bursting strength improves 10%, and tearing strength is basic identical, and beating time reduces 35% simultaneously.

Embodiment 3: the mixture that adds the 1:1 weight ratio of hemicellulase Pulpzymes HC and cellulase Nozymes51064 in the fresh reed sulfate pulp of bleaching back undried, the enzyme addition is 200g/ ton slurry, at 30-55 ℃, following 0.5-the 2.0h that handles of pH6.0-8.0 uses the disc mill defibrination dense time at the slurry of 3.0-4.0% then.50-55 ° of SR of pulp beating degree behind the defibrination compare with the paper pulp of not enzyme-added processing, and after the enzyme-added processing making beating, under same beating degree, tensile strength improves 12%, and bursting strength improves 8%, and tearing strength is basic identical, and beating time reduces 35% simultaneously.

Embodiment 4: as embodiment 1, different is that the enzyme pulp treatment is caustic soda-anthraquinone wheat straw bleached pulp.

Embodiment 5: as embodiment 2, different is that the enzyme pulp treatment is caustic soda-anthraquinone bagasse pulp.

Embodiment 6: as embodiment 2, different is that the enzyme treatment temperature is 20-30 ℃, and the enzyme addition is 200g/ ton slurry.

Embodiment 7: as embodiment 1, different adding enzymes be hemicellulase Pulpzymes HC, enzyme dosage is 150g/ ton slurry.

Embodiment 8: as embodiment 2, different is that the enzyme that adds is cellulase Novozymes342, and enzyme dosage is 250g/ ton slurry.

Embodiment 9: as embodiment 1, different is that the paper pulp that enzyme is handled is reed sulfate brown stock.

Embodiment 10: as embodiment 1, different is that the paper pulp that enzyme is handled is undried fresh bleached wheat straw pulp.

Embodiment 11: as embodiment 1, different is that the paper pulp that enzyme is handled is cotton pulp, and the enzyme of adding is cellulase Nozymes51064, and the beating degree of cotton pulp is 70-96 ° of SR.

Claims

1, a kind of non-wood pulp bioremediation, step is as follows:

Add enzyme in the paper pulp before making beating and handle, enzyme dosage is 150-250g/ ton slurry, starch dense 3%-20%, 20-60 ℃ of temperature, time 0.5-4.0h, pH5.0-8.5;

Described enzyme is that Novozymes Company produces hemicellulase Pulpzymes HC, cellulase Nozymes342;

2, non-wood pulp bioremediation as claimed in claim 1 is characterized in that described enzyme is to add in the paper pulp size degradation process before making beating or directly join in the paper pulp of fresh undried.