CN101158121B - Process for manufacturing dissolved pulp by using ethanol, sulfate and acetic acid - Google Patents
Process for manufacturing dissolved pulp by using ethanol, sulfate and acetic acid Download PDFInfo
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- CN101158121B CN101158121B CN2007100505114A CN200710050511A CN101158121B CN 101158121 B CN101158121 B CN 101158121B CN 2007100505114 A CN2007100505114 A CN 2007100505114A CN 200710050511 A CN200710050511 A CN 200710050511A CN 101158121 B CN101158121 B CN 101158121B
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Abstract
The invention discloses a technique of making dissolving pulp by ethanol, sulfate and acetic acid. The manufacturing technique sequentially comprises cropping, screening and removing ashes, washing, ethanol extraction, sulfate cooking, pulp separation, scrubbing purification, chlorination treatment, alkali treatment, acetic acid bleaching +H2O2 oxidation organic bleaching, acid complex treatment and runnability. The invention effectively shortens production process, enhances production efficiency of producing dissolving pulp by using bamboo, wood, a masson pine, a ramulus mori and a Chinese alpine rush; the dissolving pulp can be used in the field of textile dissolving pulp, nitration dissolving pulp, acetic acid dissolving pulp and cellulose dissolving pulp, at the same time the invention enhances harvesting rate of making dissolving pulp by the bamboo, the wood, the masson pine, the ramulus mori and the Chinese alpine rush.
Description
Technical field
The present invention relates to a kind of manufacturing technique of dissolving pulp, relate generally to the technology of making dissolving pulp with ethanol, sulfate, acetate.
Background technology
Because fast development of society, living standards of the people improve constantly, the consumption of social resources increases the natural rate of growth that has been far longer than resource, can not satisfy the needs of social sustainable development, particularly textile industry viscose glue, cellulose mystery and the present resource of the used raw material of nitrated production field are deficient.The dissolving pulp materials in present weaving dissolving pulp, nitrated dissolving pulp, acetate dissolution slurry, cellulose ether dissolving pulp field all utilize cotton or cotton linter to make with extra care and produce, in recent years along with weaving dissolving pulp, acetate dissolution are starched, the fast development of cellulose ether dissolving pulp, and the influence of factor such as sown areas of cotton, supply-demand relationship is broken, the amount of cotton, cotton linter can not satisfy the demands far away, raw-material price rises, the production cost of enterprise sharp rises, economic benefit seriously is affected, and the development of enterprise is at a low ebb.Consider that from the long-range strategy of sustainable development exploitation that occupies with resource of resource is the most important condition of country, enterprise development; The raw-material range of choice that fiber uses industry has been expanded in nitrated dissolving pulp, acetate dissolution slurry, novel material that the cellulose ether dissolving pulp is suitable for and the research and development success of production technology thereof, and the sustainable development of society is had positive meaning.
Summary of the invention
The objective of the invention is to overcome above-mentioned technological deficiency, a kind of technology of making dissolving pulp with ethanol, sulfate, acetate is provided.Adopt the present invention can effectively shorten production procedure, improve the production efficiency for weaving dissolving pulp, nitrated dissolving pulp, acetate dissolution slurry, the employed dissolving pulp in cellulose ether dissolving pulp field such as the production that utilizes bamboo wood, timber, masson pine, ramulus mori, Chinese alpine rush, improve the yield rate that bamboo wood, timber, masson pine, ramulus mori, Chinese alpine rush etc. are produced dissolving pulp simultaneously.
For achieving the above object, the technical solution used in the present invention is:
Technology with ethanol, sulfate, acetate manufacturing dissolving pulp is characterized in that: described manufacturing technique comprises blank, screening ash disposal in regular turn, washes material, ethanol extracting, sulphate cook, slurries separation, washing, purifying, chloridized, alkali treatment, acetate bleaching+H
2O
2The organic bleaching of oxidation, sour complexing are handled, are manufactured paper with pulp, and its concrete steps are:
A, raw material blank: bamboo wood or timber or ramulus mori or Chinese alpine rush are cut;
B, screening ash disposal: the raw material after the cutting is screened, remove ash, bits;
C, wash material: the raw material that the B step is obtained washs, and removes dust;
D, ethanol extracting: with the raw material of C step with ethanol, its volume ratio of containing 30-98% be raw material ratio ethanol 1: 1-10, the ethanol extracting of carrying out 10-130min under 100-210 ℃ of condition handles;
E, boiling, intensification, venting:
Boiling: the raw material that the D step obtains is put into the water that contains sulfate, form cooked solution; The weight ratio of raw material and solution is 1: 3-5; The boiling alkali charge is that 8-30%, the sulphidity 8-32% of over dry raw material weight is as the criterion;
Heat up :-section heating-up time 60-90min, temperature reaches 125-145 ℃, and temperature retention time is 60-90min; Two sections heating-up time 30-45min, temperature reaches 160-175 ℃, and temperature retention time is 90-150min, holding temperature: 160-175 ℃, obtains slurry;
Venting: be warmed up to 125-145 ℃ at one section, after temperature retention time reaches 60-90min, exit;
F, slurries separate: the black liquor that produces in digestion process that contains in the slurry that the E step is obtained separates;
G, washing, purifying: the slurry that F is obtained washs, and removes the fiber impurity and the mineral impurity that can not utilize simultaneously;
H, chlorination: when the slurry concentration of G step is 2.0-5.0%, feed liquid chlorine, make the production chlorlignin of lignin reaction of slurry and stripping, chlorine dosage is the 1.0-10% of slurry oven-dry weight, the feeding time: 20-80min;
I, alkali treatment: adding caustic soda in the slurry that the H step obtains, is to be warming up to 70-80 ℃, temperature retention time 60-90 minute, stripping alkali lignin under the 3-12% condition at slurry concentration;
J, acetate+H
2O
2The organic bleaching of oxidation: with the acetate amount is 0.5-10%, the time 10-180min of slurry oven-dry weight, 0.1-10.0% that the hydrogen peroxide consumption is the slurry oven-dry weight, hydrogen peroxide bleaching stabilizer is the slurry oven-dry weight 0.3-5.0%, under 40-120 ℃ of temperature the stripping lignin;
K, sour complexing are handled: with hydrochloric acid or nitric acid the slurry pH value is adjusted to 1-6, adds the complexing of metal ion agent again with the complexing of metal ion stripping in the slurry, the complexing agent addition is the 0.1-3.0% of slurry oven-dry weight; Reaction time 15-150min, slurry concentration are 0.5～15.0%;
L, manufacture paper with pulp: the slurry that the K step is obtained is manufactured paper with pulp and is cut into the sheet pulpboard; Obtain finished product;
The technical indicator of described finished product is: viscosity 6-500mpa.s, alpha cellulose 90.0-99.0%, moisture 10.0 ± 2%, ash content≤0.20%, iron content≤22ppm, sulfuric acid insolubles content≤0.35%, whiteness 65-92%, constant volume weight 500-1200g/m
3
During described I step alkali treatment, also added hydrogen peroxide when adding caustic soda, the addition of hydrogen peroxide is the 0.5-1% of slurry oven-dry weight.
The invention has the advantages that:
1, among the present invention, the ethanol extracting is exactly to utilize ethanol in high temperature, the high pressure group generation snap action to hemicellulose, pentosan etc., and the stripping of the thing of realization response simultaneously realizes that fiber purifies; Sulphate cook is used for the processing of ethanol fiber that extracting is produced, and to the stripping once more of remaining polymer wood quality, pentosan, reaches the further purification of fiber; H
2O
2Oxidation+caustic soda purify be the oxidisability utilized to fiber bleached, and utilize chlorinated lignin to realize the purification of fiber in the stripping of alkali condition; Acetate+H
2O
2The organic bleaching of oxidation is exactly to utilize acetate and H
2O
2The peroxidating acetate that chemical combination forms is a kind of potent bleaching agent, so do not need to be bleached again; The existence of acetate is arranged simultaneously, at high temperature, be easy to reaction, reach the stripping of hemicellulose, the purification dissolving pulp with the acyl group of hemicellulose.
2, among the present invention, make full use of H in the bleaching section
2O
2Characteristic, in the stripping chlorinated lignin, accelerating oxidation bleached fiber again; Make full use of H in addition
2O
2The synthetic potent bleaching agent of peroxidating acetate under the condition of acetate is being arranged, realize the bleaching purpose, reach quality requirement, cancelled the bleaching and the hydrogen peroxide bleaching of traditional hypochlorite, avoided simultaneously adding the high mass deficiency of dissolving pulp ash content that waterglass causes because of hydrogen peroxide bleaching.Simultaneously also reduced the strong degradation of the bleaching of dimension chlorate, improved content of cellulose and cellulosic yield rate fiber.
3, cancelled acidic hydrolysis or steam hydrolysis or the water hydrolyzing process of traditional fibrous raw material at cooking section, this operation processing time is long in the past, utilization rate of equipment and installations is low, investment is big, make the production efficiency of digesting apparatus improve more than 1 times by the present technique innovation, content of cellulose improves greatly simultaneously, and the yield rate of dissolving pulp is improved;
4, in the production process of dissolving pulp, cancelled the hypochlorite technology of traditional dissolving pulp in hypochlorite+hydrogen peroxide bleaching that the bleaching section is adopted, reduced the degradation of fiber effect, cellulose amount gets a promotion, viscosity has also obtained stable, has improved the fiber yield rate.Shortened production procedure, reduced production cost, the present invention simultaneously is applicable to multiple fibrous raw material, satisfies the quality requirement of different field to the fibrolysis slurry, has reduced the dependence of the past to cotton or cotton linter, has realized the raw-material exploitation of many kinds simultaneously.
The specific embodiment
Embodiment 1:
With the technology of ethanol, sulfate, acetate manufacturing dissolving pulp, described manufacturing technique comprises blank, screening ash disposal in regular turn, washes material, ethanol extracting, sulphate cook, slurries separation, washing, purifying, chloridized, alkali treatment, acetate bleaching+H
2O
2The organic bleaching of oxidation, sour complexing are handled, are manufactured paper with pulp, and its concrete steps are:
A, raw material blank: raw material is cut; Raw material can be a bamboo wood, also can be timber, ramulus mori, Chinese alpine rush;
B, screening ash disposal: the raw material after the cutting is screened, remove ash, bits;
C, wash material: the raw material that the B step is obtained washs, and removes dust;
D, ethanol extracting: with the raw material of C step with ethanol, its volume ratio of containing 30% be raw material ratio ethanol 1: 1, the ethanol extracting of carrying out 10min under 100 ℃ of conditions handles;
E, boiling, intensification, venting:
Boiling: the raw material that the D step obtains is put into the water that contains sulfate, form cooked solution; The weight ratio of raw material and solution is 1: 3; The boiling alkali charge be the over dry raw material weight 8%, sulphidity 8% is as the criterion;
Heat up: one section heating-up time 60min, temperature reaches 125 ℃, and temperature retention time is 60min; Two sections heating-up time 30min, temperature reaches 160 ℃, and temperature retention time is 90min, holding temperature: 160 ℃, obtain slurry;
Venting: be warmed up to 125 ℃ at one section, after temperature retention time reaches 60min, exit;
F, slurries separate: the black liquor that produces in digestion process that contains in the slurry that the E step is obtained separates;
G, washing, purifying: the slurry that F is obtained washs, and removes the fiber impurity and the mineral impurity that can not utilize simultaneously;
H, chlorination: when the slurry concentration of G step is 2%, feed liquid chlorine, make the production chlorlignin of lignin reaction of slurry and stripping, chlorine dosage is 1% of a slurry oven-dry weight, the feeding time: 20min;
I, alkali treatment: adding caustic soda in the slurry that the H step obtains, is to be warming up to 70 ℃, temperature retention time under 3% condition 60 minutes, the stripping alkali lignin at slurry concentration; During the alkali treatment of this step, also added hydrogen peroxide when adding caustic soda, the addition of hydrogen peroxide is 0.5% of a slurry oven-dry weight;
J, acetate+H
2O
2The organic bleaching of oxidation: with the acetate amount be the slurry oven-dry weight 0.5%, time 10min, hydrogen peroxide consumption be the slurry oven-dry weight 0.1%, hydrogen peroxide bleaching stabilizer be the slurry oven-dry weight 0.3%, under 40 ℃ of temperature the stripping lignin;
K, sour complexing are handled: with hydrochloric acid or nitric acid the slurry pH value is adjusted to 1, adds the complexing of metal ion agent again with the complexing of metal ion stripping in the slurry, the complexing agent addition is 0.1% of a slurry oven-dry weight; Reaction time 15min, slurry concentration are 0.5%;
L, manufacture paper with pulp: the slurry that the K step is obtained is manufactured paper with pulp and is cut into the sheet pulpboard; Obtain finished product;
The technical indicator of described finished product is: viscosity 6-500mpa.s, alpha cellulose 90.0-99.0%, moisture 10.0 ± 2%, ash content≤0.20%, iron content≤22ppm, sulfuric acid insolubles content≤0.35%, whiteness 65-92%, constant volume weight 500-1200g/m
3
Embodiment 2:
Technology with ethanol, sulfate, acetate manufacturing dissolving pulp is characterized in that: described manufacturing technique comprises blank, screening ash disposal in regular turn, washes material, ethanol extracting, sulphate cook, slurries separation, washing, purifying, chloridized, alkali treatment, acetate bleaching+H
2O
2The organic bleaching of oxidation, sour complexing are handled, are manufactured paper with pulp, and its concrete steps are:
A, raw material blank: raw material is cut; Raw material can be a bamboo wood, also can be timber, ramulus mori, Chinese alpine rush;
B, screening ash disposal: the raw material after the cutting is screened, remove ash, bits;
C, wash material: the raw material that the B step is obtained washs, and removes dust;
D, ethanol extracting: with the raw material of C step with ethanol, its volume ratio of containing 98% be raw material ratio ethanol 1: 10, the ethanol boiling extracting of carrying out 130min under 210 ℃ of conditions handles;
E, boiling, intensification, venting:
Boiling: the raw material that the D step obtains is put into the water that contains sulfate, form cooked solution; The weight ratio of raw material and solution is 1: 5; The boiling alkali charge be the over dry raw material weight 30%, sulphidity 32% is as the criterion;
Heat up: one section heating-up time 90min, temperature reaches 145 ℃, and temperature retention time is 90min; Two sections heating-up time 45min, temperature reaches 175 ℃, and temperature retention time is 150min, holding temperature: 175 ℃, obtain slurry;
Venting: be warmed up to 145 ℃ at one section, after temperature retention time reaches 90min, exit;
F, slurries separate: the black liquor that produces in digestion process that contains in the slurry that the E step is obtained separates;
G, washing, purifying: the slurry that F is obtained washs, and removes the fiber impurity and the mineral impurity that can not utilize simultaneously;
H, chlorination: when the slurry concentration of G step is 5.0%, feed liquid chlorine, make the production chlorlignin of lignin reaction of slurry and stripping, chlorine dosage is 10% of a slurry oven-dry weight, the feeding time: 80min;
I, alkali treatment: adding caustic soda in the slurry that the H step obtains, is to be warming up to 80 ℃, temperature retention time under 12% condition 90 minutes, the stripping alkali lignin at slurry concentration; When the alkali treatment of this step, when adding caustic soda, also added hydrogen peroxide, the addition of hydrogen peroxide is the 0.5-1% of slurry oven-dry weight;
J, acetate+H
2O
2The organic bleaching of oxidation: with the acetate amount be the slurry oven-dry weight 10%, time 180min, hydrogen peroxide consumption be the slurry oven-dry weight 10.0%, hydrogen peroxide bleaching stabilizer be the slurry oven-dry weight 5.0%, under 120 ℃ of temperature the stripping lignin;
K, sour complexing are handled: with hydrochloric acid or nitric acid the slurry pH value is adjusted to 6, adds the complexing of metal ion agent again with the complexing of metal ion stripping in the slurry, the complexing agent addition is 3.0% of a slurry oven-dry weight; Reaction time 150min, slurry concentration are 15.0%;
L, manufacture paper with pulp: the slurry that the K step is obtained is manufactured paper with pulp and is cut into the sheet pulpboard; Obtain finished product;
The technical indicator of described finished product is: viscosity 6-500mpa.s, alpha cellulose 90.0-99.0%, moisture 10.0 ± 2%, ash content≤0.20%, iron content≤22ppm, sulfuric acid insolubles content≤0.35%, whiteness 65-92%, constant volume weight 500-1200g/m
3
Embodiment 3:
Technology with ethanol, sulfate, acetate manufacturing dissolving pulp is characterized in that: described manufacturing technique comprises blank, screening ash disposal in regular turn, washes material, ethanol extracting, sulphate cook, slurries separation, washing, purifying, chloridized, alkali treatment, acetate bleaching+H
2O
2The organic bleaching of oxidation, sour complexing are handled, are manufactured paper with pulp, and its concrete steps are:
A, raw material blank: raw material is cut; Raw material can be a bamboo wood, also can be timber, ramulus mori, Chinese alpine rush;
B, screening ash disposal: the raw material after the cutting is screened, remove ash, bits;
C, wash material: the raw material that the B step is obtained washs, and removes dust;
D, ethanol extracting: with the raw material of C step with ethanol, its volume ratio of containing 30-98% be raw material ratio ethanol 1: 8, the ethanol extracting of carrying out 90min under 150 ℃ of conditions handles;
E, boiling, intensification, venting:
Boiling: the raw material that the D step obtains is put into the water that contains sulfate, form cooked solution; The weight ratio of raw material and solution is 1: 4; The boiling alkali charge is that 8-30%, the sulphidity 8-32% of over dry raw material weight is as the criterion;
Heat up: one section heating-up time 85min, temperature reaches 138 ℃, and temperature retention time is 65min; Two sections heating-up time 38min, temperature reaches 165 ℃, and temperature retention time is 80min, holding temperature: 160-175 ℃, obtains slurry;
Venting: be warmed up to 138 ℃ at one section, after temperature retention time reaches 65min, exit;
F, slurries separate: the black liquor that produces in digestion process that contains in the slurry that the E step is obtained separates;
G, washing, purifying: the slurry that F is obtained washs, and removes the fiber impurity and the mineral impurity that can not utilize simultaneously;
H, chlorination: when the slurry concentration of G step is 3%, feed liquid chlorine, make the production chlorlignin of lignin reaction of slurry and stripping, chlorine dosage is 3% of a slurry oven-dry weight, the feeding time: 40min;
I, alkali treatment: adding caustic soda in the slurry that the H step obtains, is to be warming up to 75 ℃, temperature retention time under the 3-12% condition 85 minutes, the stripping alkali lignin at slurry concentration;
J, acetate+H
2O
2The organic bleaching of oxidation: with the acetate amount be the slurry oven-dry weight 3%, time 50min, hydrogen peroxide consumption be the slurry oven-dry weight 4%, hydrogen peroxide bleaching stabilizer be the slurry oven-dry weight 4%, under 90 ℃ of temperature the stripping lignin;
K, sour complexing are handled: with hydrochloric acid or nitric acid the slurry pH value is adjusted to 5, adds the complexing of metal ion agent again with the complexing of metal ion stripping in the slurry, the complexing agent addition is 1.5% of a slurry oven-dry weight; Reaction time 40min, slurry concentration are 9.5%;
L, manufacture paper with pulp: the slurry that the K step is obtained is manufactured paper with pulp and is cut into the sheet pulpboard; Obtain finished product;
The technical indicator of described finished product is: viscosity 6-500mpa.s, alpha cellulose 90.0-99.0%, moisture 10.0 ± 2%, ash content≤0.20%, iron content≤22ppm, sulfuric acid insolubles content≤0.35%, whiteness 65-92%, constant volume weight 500-1200g/m
3
During described I step alkali treatment, also added hydrogen peroxide when adding caustic soda, the addition of hydrogen peroxide is the 0.5-1% of slurry oven-dry weight.
Embodiment 4:
Technology with ethanol, sulfate, acetate manufacturing dissolving pulp is characterized in that: described manufacturing technique comprises blank, screening ash disposal in regular turn, washes material, ethanol extracting, sulphate cook, slurries separation, washing, purifying, chloridized, alkali treatment, acetate bleaching+H
2O
2The organic bleaching of oxidation, sour complexing are handled, are manufactured paper with pulp, and its concrete steps are:
A, raw material blank: raw material is cut; Raw material can be a bamboo wood, also can be timber, ramulus mori, Chinese alpine rush;
B, screening ash disposal: the raw material after the cutting is screened, remove ash, bits;
C, wash material: the raw material that the B step is obtained washs, and removes dust;
D, ethanol extracting: with the raw material of C step with ethanol, its volume ratio of containing 98% be raw material ratio ethanol 1: 1, the ethanol extracting of carrying out 10min under 210 ℃ of conditions handles;
E, boiling, intensification, venting:
Boiling: the raw material that the D step obtains is put into the water that contains sulfate, form cooked solution; The weight ratio of raw material and solution is 1: 3; The boiling alkali charge be the over dry raw material weight 30%, sulphidity 8% is as the criterion;
Heat up: one section heating-up time 60min, temperature reaches 145 ℃, and temperature retention time is 75min; Two sections heating-up time 40min, temperature reaches 160 ℃, and temperature retention time is 150min, holding temperature: 175 ℃, obtain slurry;
Venting: be warmed up to 145 ℃ at one section, after temperature retention time reaches 60min, exit;
F, slurries separate: the black liquor that produces in digestion process that contains in the slurry that the E step is obtained separates;
G, washing, purifying: the slurry that F is obtained washs, and removes the fiber impurity and the mineral impurity that can not utilize simultaneously;
H, chlorination: when the slurry concentration of G step is 5%, feed liquid chlorine, make the production chlorlignin of lignin reaction of slurry and stripping, chlorine dosage is 1% of a slurry oven-dry weight, the feeding time: 80min;
I, alkali treatment: adding caustic soda in the slurry that the H step obtains, is to be warming up to 80 ℃, temperature retention time under 3% condition 60 minutes, the stripping alkali lignin at slurry concentration;
J, acetate+H
2O
2The organic bleaching of oxidation: with the acetate amount be the slurry oven-dry weight 10%, time 180min, hydrogen peroxide consumption be the slurry oven-dry weight 10%, hydrogen peroxide bleaching stabilizer be the slurry oven-dry weight 5.0%, under 20 ℃ of temperature the stripping lignin;
K, sour complexing are handled: with hydrochloric acid or nitric acid the slurry pH value is adjusted to 6, adds the complexing of metal ion agent again with the complexing of metal ion stripping in the slurry, the complexing agent addition is 3.0% of a slurry oven-dry weight; Reaction time 150min, slurry concentration are 15%;
L, manufacture paper with pulp: the slurry that the K step is obtained is manufactured paper with pulp and is cut into the sheet pulpboard; Obtain finished product;
The technical indicator of described finished product is: viscosity 6-500mpa.s, alpha cellulose 90.0-99.0%, moisture 10.0 ± 2%, ash content≤0.20%, iron content≤22ppm, sulfuric acid insolubles content≤0.35%, whiteness 65-92%, constant volume weight 500-1200g/m
3
During described I step alkali treatment, also added hydrogen peroxide when adding caustic soda, the addition of hydrogen peroxide is the 0.5-1% of slurry oven-dry weight.
Embodiment 5:
Technology with ethanol, sulfate, acetate manufacturing dissolving pulp is characterized in that: described manufacturing technique comprises blank, screening ash disposal in regular turn, washes material, ethanol extracting, sulphate cook, slurries separation, washing, purifying, chloridized, alkali treatment, acetate bleaching+H
2O
2The organic bleaching of oxidation, sour complexing are handled, are manufactured paper with pulp, and its concrete steps are:
A, raw material blank: raw material is cut; Raw material can be a bamboo wood, also can be timber, ramulus mori, Chinese alpine rush;
B, screening ash disposal: the raw material after the cutting is screened, remove ash, bits;
C, wash material: the raw material that the B step is obtained washs, and removes dust;
D, ethanol extracting: with the raw material of C step with ethanol, its volume ratio of containing 45% be raw material ratio ethanol 1: 9, the ethanol extracting of carrying out 80min under 140 ℃ of conditions handles;
E, boiling, intensification, venting:
Boiling: the raw material that the D step obtains is put into the water that contains sulfate, form cooked solution; The weight ratio of raw material and solution is 1: 3; The boiling alkali charge be the over dry raw material weight 22%, sulphidity 25% is as the criterion;
Heat up: one section heating-up time 70min, temperature reaches 145 ℃, and temperature retention time is 90min; Two sections heating-up time 30min, temperature reaches 160 ℃, and temperature retention time is 90min, holding temperature: 160 ℃, obtain slurry;
Venting: be warmed up to 145 ℃ at one section, after temperature retention time reaches 90min, exit;
F, slurries separate: the black liquor that produces in digestion process that contains in the slurry that the E step is obtained separates;
G, washing, purifying: the slurry that F is obtained washs, and removes the fiber impurity and the mineral impurity that can not utilize simultaneously;
H, chlorination: when the slurry concentration of G step is 3.8%, feed liquid chlorine, make the production chlorlignin of lignin reaction of slurry and stripping, chlorine dosage is 8.5% of a slurry oven-dry weight, the feeding time: 70min;
I, alkali treatment: adding caustic soda in the slurry that the H step obtains, is to be warming up to 80 ℃, temperature retention time under 4% condition 90 minutes, the stripping alkali lignin at slurry concentration;
J, acetate+H
2O
2The organic bleaching of oxidation: with the acetate amount be the slurry oven-dry weight 10%, time 180min, hydrogen peroxide consumption be the slurry oven-dry weight 10%, hydrogen peroxide bleaching stabilizer be the slurry oven-dry weight 5%, under 120 ℃ of temperature the stripping lignin;
K, sour complexing are handled: with hydrochloric acid or nitric acid the slurry pH value is adjusted to 5.5, adds the complexing of metal ion agent again with the complexing of metal ion stripping in the slurry, the complexing agent addition is 3% of a slurry oven-dry weight; Reaction time 150min, slurry concentration are 10%;
L, manufacture paper with pulp: the slurry that the K step is obtained is manufactured paper with pulp and is cut into the sheet pulpboard; Obtain finished product;
The technical indicator of described finished product is: viscosity 6-500mpa.s, alpha cellulose 90.0-99.0%, moisture 10.0 ± 2%, ash content≤0.20%, iron content≤22ppm, sulfuric acid insolubles content≤0.35%, whiteness 65-92%, constant volume weight 500-1200g/m
3
During described I step alkali treatment, also added hydrogen peroxide when adding caustic soda, the addition of hydrogen peroxide is the 0.5-1% of slurry oven-dry weight.
Claims (2)
1. make the technology of dissolving pulp with ethanol, sulfate, acetate, it is characterized in that: described manufacturing technique comprises that in regular turn blank, screening ash disposal, mark temperature wash material, ethanol extracting, sulphate cook, slurries separation, washing, purifying, chlorination, alkali treatment, acetate bleaching+H
2O
2The organic bleaching of oxidation, sour complexing processing, fiber are manufactured paper with pulp, and its concrete steps are:
A, raw material blank: raw material is cut; Raw material can be a bamboo wood, also can be timber, ramulus mori, Chinese alpine rush;
B, screening ash disposal: the raw material after the cutting is screened, remove ash, bits;
C, wash material: the raw material that the B step is obtained washs, and removes dust;
D, ethanol extracting: with the raw material of C step with ethanol, its volume ratio of containing 30-98% be raw material ratio ethanol 1: 1-10, the ethanol extracting of carrying out 10-130min under 100-210 ℃ of condition handles;
E, boiling, intensification, venting:
Boiling: the raw material that the D step obtains is put into the water that contains sulfate, form cooked solution; The weight ratio of raw material and solution is 1: 3-5; The boiling alkali charge is that 8-30%, the sulphidity 8-32% of over dry raw material weight is as the criterion;
Heat up: one section heating-up time 60-90min, temperature reaches 125-145 ℃, and temperature retention time is 60-90min; Two sections heating-up time 30-45min, temperature reaches 160-175 ℃, and temperature retention time is 90-150min, holding temperature: 160-175 ℃, obtains slurry;
Venting: be warmed up to 125-145 ℃ at one section, after temperature retention time reaches 60-90min, exit;
F, slurries separate: the black liquor that produces in digestion process that contains in the slurry that the E step is obtained separates;
G, washing, purifying: the slurry that F is obtained washs, and removes the fiber impurity and the mineral impurity that can not utilize simultaneously;
H, chlorination: when the slurry concentration of G step is 2.0-5.0%, feed liquid chlorine, make the production chlorlignin of lignin reaction of slurry and stripping, chlorine dosage is the 1.0-10% of slurry oven-dry weight, the feeding time: 20-80min;
I, alkali treatment: adding caustic soda in the slurry that the H step obtains, is to be warming up to 70-80 ℃, temperature retention time 60-90 minute, stripping alkali lignin under the 3-12% condition at slurry concentration;
J, acetate+H
2O
2The organic bleaching of oxidation: with the acetate amount is 0.5-10%, the time 10-180min of slurry oven-dry weight, 0.1-10.0% that the hydrogen peroxide consumption is the slurry oven-dry weight, hydrogen peroxide bleaching stabilizer is the slurry oven-dry weight 0.3-5.0%, under 40-120 ℃ of temperature the stripping lignin;
K, sour complexing are handled: with hydrochloric acid or nitric acid the slurry pH value is adjusted to 1-6, adds the complexing of metal ion agent again with the complexing of metal ion stripping in the slurry, the complexing agent addition is the 0.1-3.0% of slurry oven-dry weight; Reaction time 15-150min, slurry concentration are 0.5～15.0%;
L, fiber pulp are manufactured paper with pulp: the slurry that the K step is obtained is manufactured paper with pulp and is cut into the sheet pulpboard; Obtain finished product.
2. according to claim 1ly make the technology of dissolving pulp with ethanol, sulfate, acetate, it is characterized in that: during described I step alkali treatment, also add hydrogen peroxide when adding caustic soda, the addition of hydrogen peroxide is the 0.5-1% of slurry oven-dry weight.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100505114A CN101158121B (en) | 2007-11-15 | 2007-11-15 | Process for manufacturing dissolved pulp by using ethanol, sulfate and acetic acid |
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| CN2007100505114A CN101158121B (en) | 2007-11-15 | 2007-11-15 | Process for manufacturing dissolved pulp by using ethanol, sulfate and acetic acid |
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| CN101158121A CN101158121A (en) | 2008-04-09 |
| CN101158121B true CN101158121B (en) | 2011-04-06 |
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| CN102517968B (en) * | 2011-12-20 | 2014-01-15 | 恒天海龙股份有限公司 | Method for preparing dissolving pulp for viscose fibers by using mulberry twig stem cores |
| CN102828431B (en) * | 2012-08-20 | 2014-12-10 | 四川理工学院 | Prehydrolysis additive for dissolving pulp production and preparation method thereof |
| CN102796629A (en) * | 2012-08-22 | 2012-11-28 | 环球石材（山东）有限公司 | Mildew remover agent for removing organic black spots on marble surface |
| CN109653012B (en) * | 2017-10-12 | 2021-01-12 | 中国科学院青岛生物能源与过程研究所 | Method for preparing dissolving pulp by using straws or energy plants |
| CN108797176B (en) * | 2018-06-06 | 2021-02-19 | 华南理工大学 | Method for preparing dissolving pulp from all cotton stalks |
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| CN1266122A (en) * | 2000-03-22 | 2000-09-13 | 中国科学院广州化学研究所 | Process for preparing Chinese cassia tree dissolving pulp |
| CN1410627A (en) * | 2002-09-16 | 2003-04-16 | 成都春天绿竹资源开发有限责任公司 | Production technology of pure natural antibacterial bamboo paste |
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| CN1266122A (en) * | 2000-03-22 | 2000-09-13 | 中国科学院广州化学研究所 | Process for preparing Chinese cassia tree dissolving pulp |
| CN1410627A (en) * | 2002-09-16 | 2003-04-16 | 成都春天绿竹资源开发有限责任公司 | Production technology of pure natural antibacterial bamboo paste |
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