CN101735323B - Method for producing acetate fiber bamboo pulp - Google Patents
Method for producing acetate fiber bamboo pulp Download PDFInfo
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- CN101735323B CN101735323B CN2009102634481A CN200910263448A CN101735323B CN 101735323 B CN101735323 B CN 101735323B CN 2009102634481 A CN2009102634481 A CN 2009102634481A CN 200910263448 A CN200910263448 A CN 200910263448A CN 101735323 B CN101735323 B CN 101735323B
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Abstract
The invention provides a method for producing acetate fiber bamboo pulp, which overcomes the defect of the traditional acetate fiber bamboo pulp preparing technologywhich combines prehydrolysis and alkaline and sulphite cooking. The method comprises the following steps of: concentrating and dehydrating defibered unbleached natural bamboo pulp, and delivering into a dual screw roller type pulping machine; continuing to dehydrate and adding chemical liquor in the dual screw roller type pulping machine; conducting the processes of continuous concentration, kneading and chemical liquor mixing in the dual screw roller type pulping machine; then conveying the pulp into a reaction chamber to store and react; after reaction, delivering to cook for the second time; and after cooking, performing the processes of washing, bleaching, refining, sand removal, sieving and paper making. As the unbleached natural bamboo pulp has high viscosity, the cooking strength during cooking is controlled, the damage of the chemical liquor to the fiber cell wall is promoted, thereby facilitating the physical liquor permeating and improving the reaction activity.
Description
Technical field
The present invention relates to be used to produce the working method of viscose fiber bamboo wood pulps, the present invention is particularly useful for preparing cellulose acetate.
Background technology
Acetate fiber bamboo pulp requires its alpha fibre content high, and promptly fiber fineness is high.The main means of present preparation technology are to adopt two-stage (multistage) boiling of prehydrolysis+alkaline process (sulphate process) two-stage boiling or sulphite process; Take above-mentioned two kinds of pulping by cooking technology; Mainly be for removing lignins a large amount of in the raw material, impurity such as semicellulose (poly-pentose) and resin.Especially remove the semicellulose (poly-pentose) in the raw material; Must be under acidic conditions; Acidic hydrolysis takes place in semicellulose (poly-pentose), can in first stage boiling such as prehydrolysis, slough in a large number, reach viscose fiber produce in to the minimum requirements of semicellulose (poly-pentose) content; After accomplishing first stage boiling, the secondary boiling continues to remove the purpose of a small amount of semicellulose.Adopt above-mentioned two kinds of methods to produce bamboo dissolved pulp, though it is higher to have alpha-cellulose content, reactive behavior is advantage preferably; But invest bigger; The shortcoming that production cycle is long, its industrial scale, production capacity is restricted; Along with the development of cellulose acetate and derivatived cellulose industry, dissolving pulp (comprising cotton, wood, wood pulps) demand is increased.
Summary of the invention
The present invention is intended to overcome existing acetic acid pulp and adopts prehydrolysis+alkaline process and the existing drawback of sulfite cooking with bamboo pulp preparation technology, and a kind of method for producing acetate fiber bamboo pulp is provided.
For realizing above-mentioned purpose, the technical scheme that the present invention adopts is following:
Method for producing acetate fiber bamboo pulp; The discongesting of bamboo pulp, thickening, soup mixing, boiling, washing, bleaching, removal of impurities, wash, manufacture paper with pulp, it is characterized in that: after discongesting, do not float true qualities bamboo pulp, after thickening, send into the duplex roller type paste mill; In the duplex roller type paste mill, continue dehydration; And the adding soup, slurry in the duplex roller type paste mill, accomplish continue to concentrate, rub, the soup mixed processes, slurry is transported to stores in the reaction warehouse and reaction then; Reaction is sent after finishing secondary boiled, boiling finish washing, bleaching, make with extra care, desanding, screen, manufacture paper with pulp.
Said secondary boiled processing condition: liquor ratio: 1: 3-7.0, charge: 160-260kg (over dry slurry/m
3), the intensification condition: the pan feeding temperature is warmed up to 115-130 ℃, time 30-60min, insulation 30-120min; Steam bleeding 5-20min continues to be warmed up to 140-155 ℃, TRT 30-60min, insulation 120-180min; Insulation finishes, and continues to be warmed up to 165-170 ℃, insulation 30-210min, and insulation finishes; The cooling blowing, blowing is after the filtering stock quality index: alpha-cellulose: 95-99%, the polymerization degree: 1100-2500.
Said refining step carries out in the tower in alkalization, slurry concentration 4-12%, and alkali charge: 4-12%, temperature: normal temperature-50 ℃, the residence time: 1-2h, alkalization finishes: deliver to the washing of vacuum pulp washing machine or decker, wash to pH7-9.
Said soup comprises at least: NaOH% (in NaOH), consumption is: 10-50%.
Beneficial effect of the present invention shows:
It is short that this invention has flow process, with short production cycle, can in shorter cooking time, produce the higher quality cellulose acetate with bamboo dissolved pulp (bamboo pulp), significantly improves first fibre content (alpha-cellulose 95-99.0%) and reach and be superior to traditional technology preparing product level.
Have higher viscosity owing to take true qualities not float bamboo pulp (papermaking level), control boiling intensity is set suitable boiling temperature, cooking time, alkali charge etc. when boiling; Promote the destruction of soup, help the soup infiltration, adopt duplex roller type paste mill (double-screw pulp-milling) the fiber finer cell wall; Can rub fiber at higher slurry dense (30-50%) down; Mutual friction between reinforcing fibre impels fibre wall to break, and makes fiber wire-dividing broom purification, distortion, conquassation; Reaching increases the fiber surface area purpose, helps improving reactive behavior.
The present invention strengthens secondary boiled (carrying out once boiling in the duplex roller type paste mill and in the reaction warehouse); Can effectively remove bamboo quality and semicellulose residual in the slurry, and other impurity (different fully with effect with the secondary boiled purpose that is adopted in the preparation of the acetic acid cotton pulp dregs of rice).
In addition, the ingenious utilization refining step of the present invention (alkali charge: 4-12%, temperature: normal temperature-50 ℃) has guaranteed that further the fine content of first reaches 95-99.0%.
Embodiment
The present invention provides a kind of method for producing acetate fiber bamboo pulp, adopts prehydrolysis+alkaline process and the existing drawback of sulfite cooking to overcome existing acetic acid pulp with bamboo pulp preparation technology.
Step is following:
A. use the broken machine of high dense water that the bamboo pulp plate is discongested, be transported to duplex roller type paste mill (twin screw or two roller pulper) after discongesting.
B. in the duplex roller type paste mill, in first section, two sections, add entry, in three sections positive antispin, add soup.
C. after reaction finished, discharge port sent and stores in the reaction warehouse and reaction.
D. reaction is sent secondary boiled workshop section after finishing in the reaction warehouse, boiling finish washing, bleaching, make with extra care, desanding, screening.
Concrete technological process is:
A. with the bamboo pulp plate, after putting into the broken machine of high dense water (pulping engine) and treating that pulpboard is discongested fully, be transported to subsequent processing.
Processing condition:
Slurry concentration: 12-15% (to oven dry stock)
B. slurry is sent into the duplex roller type paste mill, in one, two section positive and negative helical region, add water, the 3rd section adds soup.
Processing condition:
Advance to starch concentration: 12-15% (to oven dry stock, weight percent)
NaOH% (in NaOH): 10-50% (to the oven dry stock meter)
Na
2SO
3% is (with Na
2SO
3Meter): 0.10-50.0% (to the oven dry stock meter)
Na
2S% (in NaOH): 0.1-40.0% (to the oven dry stock meter)
H
2O
2% (folding 100%): 0.10-200% (to the oven dry stock meter)
Water glass is (with Na
2SiO
3Meter): 0.10-10.0% (to the oven dry stock meter)
EDTD (DTPA): 0.10-3.0% (to the oven dry stock meter)
MgSO
4(sal epsom): 0.10-7.0% (to the oven dry stock meter)
Discharging concentration: 30-45%
Drop temperature: 70-95 ℃
C. after the discharging, be transported to reaction warehouse, in reaction warehouse, continue reaction, send pulp digester after the reaction, the cooking schedule in pulp digester:
Liquor ratio: 1: 3-7.0, charge: 160-260kg (over dry slurry/m
3), the intensification condition: the pan feeding temperature is warmed up to 115-130 ℃, time 30-60min, insulation 30-120min; Steam bleeding 5-20min continues to be warmed up to 140-155 ℃, TRT 30-60min, insulation 120-180min; Insulation finishes, and continues to be warmed up to 165-170 ℃, insulation 30-210min, and insulation finishes; The cooling blowing, blowing is after the filtering stock quality index: alpha-cellulose: 95-99%, the polymerization degree: 1100-2500.
D. washing: the slurry dilution with reaction warehouse output, be pumped into Var-nip press then, dilution after extruding is pumped into series connection vacuum pulp washing machine (or decker) washing to neutral:
Processing condition:
Weaker concn: 4-5% advances Var-nip press concentration: 4-5%, goes out Var-nip press concentration: 25-35%, advances wash hollander concentration: 4-5%, goes out wash hollander concentration: 5-7%, wash degree: NaOH residual quantity 2-5.0kg/T air dried pulp.
Washing disposed slurry quality:
Alpha-cellulose: 95-99% viscosity: 25-40mpa.s
Hardness (kappi value): 5-10 whiteness: >=50%
S
18：1.5-5.0％
E. above-mentioned slurry being transported to the bleaching section bleaches and transfers sticking.
C section (chlorination section):
Chlorine dosage (in available chlorine) 4-7%
The residence time on the chlorination tower: 20-50min
Temperature: normal temperature
Concentration: 4-12%
Go out chlorination tower PH:1-2
Residual chlorine: 0.1-0.5%
Chlorination finishes: send vacuum pulp washing machine (or decker) washing, wash to PH5-6E section (sodafining):
This operation is carried out in the alkalization tower,
Slurry concentration 4-12%
Alkali charge: 4-12%
Temperature: normal temperature-50 ℃
The residence time: 1-2h
Alkalization finishes: deliver to vacuum pulp washing machine (or decker) washing, wash to PH7-9.H section (hypo(chlorite)bleaching):
In bleaching tower or Bellmer, carry out,
Chlorine dosage (in available chlorine): 1-5% PH=10.5-11.5
Temperature: 38-45 ℃
Time: 2-7h
Thionamic acid consumption: 0.5-3.0%
After bleaching required whiteness and viscosity, add Na
2S
2O
3Dechlorination adds hydrochloric acid or sulfuric acid again and carries out s.t..
Hydrochloric acid consumption (folding 100%): 2-7%
Time: 1-2h
Temperature: normal temperature
Through the s.t. after scouring, washing is washed to PH6-7 in vacuum pulp washing machine (or decker), is stored in pulp storage tank after the washing, send and manufactures paper with pulp, and copies and processes pulpboard.
The product performance index that adopts the above-mentioned embodiment of the present invention to be obtained is following:
The duplex roller type paste mill that the present invention utilized is also claimed duplex bar and duplex paste roller mill.This machine is that prototype is to be used for the equipment that plastics are extruded; After improvement, being used for the present invention pushes, concentrates, rubs with soup and mix fiber; And can adjust staple length, further improve through " wire-dividing broom purification " rate and the specific surface area of this device processes disposed slurry.The used duplex roller type paste mill of the present invention is owing to the field of extruding at plastics belongs to prior art, so its concrete structure is no longer too much given unnecessary details.
Said duplex roller type paste mill has at least a washing room and a soup to mix workshop section, and in general extruding can be arranged to two sections, does not get rid of the extruding workshop section that adopts more than three sections.Extruding workshop section is preceding; Soup mix workshop section after; The spiral of each workshop section has right-handed screw district and antispin district, and the medicine-pouring port that the water filling port of extruding workshop section and soup mix workshop section is located at the right-handed screw district of workshop section separately, and extrusion process mixes workshop section through whole washing and soup.
In the duplex roller type paste mill operational process, have extruding and friction between the bamboo pulp fiber, the reaction that produces certain heat thus and be after the dosing provides temperature condition: at the soup mixed processes; After soup mixes; Have certain temperature this moment, can carry out initial action, and this reaction can be regarded as the continuation of boiling; Institute adds amount of liquid medicine and kind adds according to the different process requirement, and this belongs to general knowledge known in this field.Add soup and mix slurry,, process slurry, water, the soup mixtinite of different liquor ratios according to follow-up boiling requirement.Discharge from the duplex roller type paste mill; Be sent to pulp digester through spiral (or belt) transfer roller and proceed suitable boiling; The boiling blowing that finishes; Continue to send after washing, bleaching, s.t., removal of impurities, the washing concentrating again and manufacture paper with pulp into pulpboard, the series of processes after the boiling belongs to general knowledge known in this field, repeats no more.
Embodiment 1:
Do not float the cooking schedule of true qualities bamboo pulp in pulp digester: liquor ratio: 1: 3, alkali charge NaOH (NaOH meter): 10% (to over dry bamboo pulp material weight percent), Na
2S (NaOH meter): 0.1% (to NaOH add-on meter), intensification condition: be warmed up to 130 ℃, time 60min, insulation 120min; Continue to be warmed up to 150 ℃, TRT 60min, insulation 180min; Insulation finishes, and continues to be warmed up to 175 ℃, insulation 180min; Insulation finishes, the cooling blowing, and boiling finishes behind the blowing.
This instance boiling disposed slurry quality index: alpha-cellulose: 95%, the polymerization degree: 2500.
Said refining step carries out in the alkalization tower, slurry concentration 4%, and alkali charge: 12%, temperature: 20 ℃, the residence time: 2h, alkalization finishes: deliver to the washing of vacuum pulp washing machine or decker, wash to pH7-9.
Embodiment 2:
Do not float the cooking schedule of true qualities bamboo pulp in pulp digester: liquor ratio: 1: 5, alkali charge NaOH (NaOH meter): 30% (to over dry bamboo pulp material weight percent), intensification condition: be warmed up to 120 ℃, time 50min; Insulation 60min continues to be warmed up to 140 ℃, TRT 45min, insulation 160min; Insulation finishes, and continues to be warmed up to 170 ℃, insulation 60min; Insulation finishes, the cooling blowing, and boiling finishes behind the blowing.
This instance boiling disposed slurry quality index: alpha-cellulose: 96%, the polymerization degree: 2000.
Said refining step carries out in the alkalization tower, slurry concentration 6%, and alkali charge: 10%, temperature: 25 ℃, the residence time: 2h, alkalization finishes: deliver to the washing of vacuum pulp washing machine or decker, wash to pH7-9.
Embodiment 3:
Do not float the cooking schedule of true qualities bamboo pulp in pulp digester: liquor ratio: 1: 6, alkali charge NaOH (NaOH meter): 50% (to over dry bamboo pulp material weight percent), Na
2S (NaOH meter): 15% (to NaOH add-on meter), anthraquinone 0.01% (to over dry bamboo pulp material weight percent), intensification condition: be warmed up to 115 ℃, time 60min, insulation 30min; Continue to be warmed up to 135 ℃, TRT 45min, insulation 120min; Insulation finishes, and continues to be warmed up to 172 ℃, insulation 30min; Insulation finishes, the cooling blowing, and boiling finishes behind the blowing.
This instance boiling disposed slurry quality index: alpha-cellulose: 96%, the polymerization degree: 2000.
Said refining step carries out in the alkalization tower, slurry concentration 12%, and alkali charge: 8%, temperature: 25 ℃, the residence time: 2h, alkalization finishes: deliver to the washing of vacuum pulp washing machine or decker, wash to pH7-9.
Embodiment 4:
Do not float the cooking schedule of true qualities bamboo pulp in pulp digester: liquor ratio: 1: 3.5, alkali charge NaOH (NaOH meter): 40% (to over dry bamboo pulp material weight percent), Na
2S (NaOH meter): 5% (to NaOH add-on meter), anthraquinone derivative 0.05% (to over dry bamboo pulp material weight percent), intensification condition: be warmed up to 125 ℃, time 35min; Insulation 50min continues to be warmed up to 140 ℃, TRT 30min, insulation 120min; Insulation finishes, and continues to be warmed up to 169 ℃, insulation 70min; Insulation finishes, the cooling blowing, and boiling finishes behind the blowing.
This instance boiling disposed slurry quality index: alpha-cellulose: 96%, the polymerization degree: 2000.
Said refining step carries out in the alkalization tower, slurry concentration 12%, and alkali charge: 10%, temperature: 30 ℃, the residence time: 1.5h, alkalization finishes: deliver to the washing of vacuum pulp washing machine or decker, wash to pH7-9.
Claims (3)
1. method for producing acetate fiber bamboo pulp; Step comprises the discongesting of bamboo pulp, thickening, soup mixing, boiling, washing, bleaching, removal of impurities, washs, manufactures paper with pulp, and it is characterized in that: after discongesting, do not float true qualities bamboo pulp, after thickening, send into the duplex roller type paste mill; In the duplex roller type paste mill, continue dehydration; And the adding soup, slurry in the duplex roller type paste mill, accomplish continue to concentrate, rub, the soup mixed processes, slurry is transported to stores in the reaction warehouse and reaction then; Reaction is sent after finishing secondary boiled, boiling finish washing, bleaching, make with extra care, desanding, screen, manufacture paper with pulp.
Said secondary boiled processing condition: liquor ratio: 1: 3-7.0, charge: with over dry slurry/m
3Count 160-260kg, the intensification condition: the pan feeding temperature is warmed up to 115-130 ℃, time 30-60min, insulation 30-120min; Steam bleeding 5-20min continues to be warmed up to 140-155 ℃, TRT 30-60min, insulation 120-180min; Insulation finishes, and continues to be warmed up to 165-170 ℃, insulation 30-210min, and insulation finishes; The cooling blowing, blowing is after the filtering stock quality index: alpha-cellulose: 95-99%, the polymerization degree: 1100-2500.
2. method for producing acetate fiber bamboo pulp according to claim 1; It is characterized in that: said refining step carries out slurry concentration 4-12%, alkali charge: 4-12% in the alkalization tower; Temperature: normal temperature-50 ℃; The residence time: 1-2h, alkalization finishes: deliver to the washing of vacuum pulp washing machine or decker, wash to pH7-9.
3. method for producing acetate fiber bamboo pulp according to claim 1 is characterized in that: said soup comprises at least: the NaOH consumption is 10-50%, in oven dry stock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102634481A CN101735323B (en) | 2009-12-17 | 2009-12-17 | Method for producing acetate fiber bamboo pulp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102634481A CN101735323B (en) | 2009-12-17 | 2009-12-17 | Method for producing acetate fiber bamboo pulp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101735323A CN101735323A (en) | 2010-06-16 |
| CN101735323B true CN101735323B (en) | 2012-02-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107075799B (en) * | 2014-11-05 | 2019-10-08 | 双子科技有限责任公司 | The preparation method of cellulose |
| CN105839449B (en) * | 2016-04-07 | 2017-08-25 | 四川理工学院 | A kind of clean method for preparing of viscose grade bamboo pulp |
| CN106065546A (en) * | 2016-06-28 | 2016-11-02 | 绍兴春明天然纤维素膜有限公司 | The preparation method of food wrapper |
| CN113605135A (en) * | 2021-08-11 | 2021-11-05 | 泰盛科技（集团）股份有限公司 | Natural color bamboo pulp preparation method and natural color bamboo pulp |
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Free format text: FORMER OWNER: YIBIN GRACE GROUP COMPANY Effective date: 20130522 Owner name: YIBIN GRACE GROUP COMPANY Free format text: FORMER OWNER: YIBIN CHANGYI POMACE CO., LTD. Effective date: 20130522 |
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Effective date of registration: 20130522 Address after: 644002 middle section of space Road, Nan'an economic and Technological Development Zone, Yibin, Sichuan Patentee after: Yibin Grace Group Company Address before: 644002 Yibin, South Bank of the middle of the road, the space shuttle Patentee before: Yibin Changyi Pomace Co., Ltd. Patentee before: Yibin Grace Group Company |