CN104631173A - Pulping method of special pulp - Google Patents
Pulping method of special pulp Download PDFInfo
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- CN104631173A CN104631173A CN201510052897.7A CN201510052897A CN104631173A CN 104631173 A CN104631173 A CN 104631173A CN 201510052897 A CN201510052897 A CN 201510052897A CN 104631173 A CN104631173 A CN 104631173A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
- D21C3/022—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes in presence of S-containing compounds
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Abstract
The invention discloses a pulping method of special pulp, and belongs to the technical field of pulp and paper making engineering. A sulfite stewing liquid is prepared from soluble base ammonium salt or sodium salt; and the special pulp is produced by using good timbers and leftover materials of monterey pine. The production technology comprises the following steps: (1) preparing the stewing liquid, which contains 3%-6% of total acid and 0.8%-1.5% of combined acid; (2) selecting a material and washing wood chips; (3) stewing in a pot, pressurizing and loading in the pot, and stewing in two stages; and (4) terminal point determination, namely determining according to reacted acid and color of a red liquid, wherein the polymerization degree of the produced pulp is greater than 2,000; the bleachability is 30%-50%; and the yield of screened pulp is 44%-55%. The requirements of high-viscosity products produced by cellulose ether and cellulose ester manufacturers can be met by bleaching; and the domestic blank is filled up.
Description
Technical field
The invention belongs to Pulp and Paper Engineering technical field, be specifically related to a kind of pulping process of extraordinary pulp.
Background technology
External dissolving pulp enterprise is large-scale synthesis group mostly, and production scale is huge, has and produces dissolving pulp experience for many years, generally all have the fast-growing forest land of oneself, and raw material is stablized and low price, and dissolving pulp product quality is highly stable, and production cost is lower.In addition, by the stimulation that China's dissolving pulp demand increases substantially, in recent years, these enterprises expanded the scale of production one after another.The demand of domestic dissolving pulp rises, and stimulates many slurry factories operation dissolving pulp project, price peak period, and viscose enterprise, slurrying enterprise adopt papermaking wood pulp, are further processed into dissolving pulp, are commonly called as " paper changes slurry ".
Within 2010, the domestic dissolving pulp appearance of enterprise utilization of capacity is not enough, and within 2011, situation is worsened, and the price of dissolving pulp significantly drops, domestic dissolving pulp enterprise is generally in lossing state, the even stopping production had, the stopping construction that new upper dissolving pulp project has, some postponements are gone into operation.Cause the main cause of this phenomenon to be global stagflation, paper making pulps increasess slowly, and the slurrying industry in South America, Southeast Asia etc., have abundant fast-growing woods advantage, by the impact of China dissolving pulp price height enterprise, superfluous slurrying production capacity is changed the line of production dissolving pulp one after another, and promotes to China energetically.Domestic relevant enterprise is absorbed in difficult condition, is badly in need of developing new product, extricates oneself from a predicament.
For many years, cotton linter is the raw material of China's dissolving pulp always.In recent years, cotton linter price fluctuation is indefinite, and viscose glue industry output increases rapidly, impels China's viscose glue industry raw material progressively to shift to wood pulp.In addition, state's fast-growing woods aboundresources such as Brazil, wood pulp dissolving pulp is in liberal supply, cheap, and domestic many chemical fiber pulp factories adopt wood pulps as raw material.
Wood pulp enterprise of China starts late, and raw material sources are unstable, and wood pulp dissolving pulp mainly relies on import, and the wood pulps of acetify, etherificate level can not be produced, and production cost is also than external height.The cellulose ether of such as food-grade, adopts the degree of polymerization 1500 ~ 1800 dissolving pulp to manufacture, all relies on external import.
At present, dissolving pulp about 60% is sulphite wood pulp.Compare with prehydrolytic sulfate process, the reactivity worth of sulphite process pulp is better, and pulp yield is higher, and shortcoming is that sulphite process can not adapt to some assortment.Change cooking liquor alkali calcium base into ammonium, sodium base soluble base, seeds accommodation can be expanded, ammonium lignin sulfonate is important fertilizer, and sodium lignosulfonate is important chemical products, and ethers high polymerization degree dissolving pulp can only adopt sulphite process to produce.American-European large factory major part uses soluble base, and domestic research is in this respect very few, cannot produce high viscosity dissolving pulp.
Summary of the invention
The object of the present invention is to provide a kind of pulping process of extraordinary pulp, with the sulfite pulping process that solubility ammonium salt, sodium salt are alkali, the pulp degree of polymerization produced is greater than 2000, bleachability is 30 ~ 50%, screened yield is 44 ~ 55%, through bleaching, cellulose ethers can be met, requirement that cellulose esters manufacturer produces high-viscosity products, fill the domestic gaps.
Object of the present invention is achieved through the following technical solutions.
The pulping process of extraordinary pulp of the present invention, step is as follows:
(1) preparation of cooking liquor: adopt sulfite pulping process, utilize soluble base sodium base or ammonium salt base, added by alkali in plant water, pass into sulfur dioxide gas, cooking liquor consists of total acid 3 ~ 6%, combined acid 0.8 ~ 1.5%;
(2) selection, washing wood chip: boiling raw material choose pine good timber or pine leftover pieces, washing wood chip removing non-fiber impurity and bark, make wood chip keep the moisture of 30 ~ 60%, liquid soaks into acceleration, favourable for early stage to boiling;
(3) pot boiling is filled: add and press-fit pot, dress pot pressure is 0.4 ~ 0.8MPa, liquor ratio is 1:(5 ~ 6.8), highest pressure is 0.8MPa, highest pressure is maintained by not parking gas during boiling, adopt two sections of boilings, one period of heating-up time is 2 ~ 4h, one section of temperature retention time is 1 ~ 3h, and one section of holding temperature is 103 ~ 105 DEG C, and two periods of heating-up times are 1 ~ 3h, two sections of temperature retention times are 15 ~ 25h, two sections of holding temperatures are 108 ~ 130 DEG C, are maximum temperature of cooking, and total cooking time is 19 ~ 35h;
(4) terminal point determining: judge terminal by the combined acid in the residual acid of red liquid, terminal combined acid is 0.15 ~-0.35%, because final stage of cooking generates acid, combined acid may be caused to be negative value, also by comparison red liquid color auxiliary judgement terminal, compare with optimal set or upper one group of red liquid, reaching the equal colors degree of depth can put pot.
In step (2), wood chip section specification is length 12 ~ 17mm, thickness 2 ~ 4mm.
In step (3), chip filling amount is 4 ~ 6kg, is determined by digester capacity and wood chip moisture.
Pulping process of the present invention comprises the pulp after putting pot also will carry out discongesting, screen and drying, and sieve seam is 0.5mm.
The pulp degree of polymerization that pulping process of the present invention prepares is greater than 2000, and bleachability is 30 ~ 50%, and screened yield is 44 ~ 55%, through bleaching, can meet cellulose ethers, requirement that cellulose esters manufacturer produces high-viscosity products.
The present invention is compared with existing pulping process, and tool has the following advantages and beneficial effect:
(1) compare with prehydrolytic sulfate process, the reactivity worth of sulphite process pulp is better, become pulp yield higher, cooking liquor alkali adopts ammonium, sodium base soluble base, assortment accommodation can be expanded, and ethers high polymerization degree dissolving pulp can only adopt sulphite process to produce, domestic research is in this respect very few;
(2) foreign technology monopolization can be broken, break away from the dependence to import high viscosity wood pulps, fill the domestic gaps, for production low viscosity dissolving pulp factory, help their clean transformations, break away from current predicament, wood leftover material slurrying can be utilized, Appropriate application timber resources, save cost;
(3) compare with external high mucilage sulphite process with traditional sulphite process, the thinking that this method adopts low total acid height combined acid, low temperature simmers, adopt two sections of boilings, low total acid can reduce acid degradation, high combined acid is conducive to protection cellulose and prevents lignin condensation, temperature has the greatest impact to fibre damage, with remove compared with lignin, low temperature is more conducive to reducing fiber degradation, simmer for a long time and can protect fiber to greatest extent, the damage that two sections of boilings can remove lignin as far as possible and reduce fiber;
(4) the pulp degree of polymerization that pulping process of the present invention prepares is greater than 2000, belongs to high viscosity pulp, and bleachability is 30 ~ 50%, and screened yield is 44 ~ 55%, through bleaching, can be used for production of cellulose ethers, cellulose esters;
(5) can obtain byproduct from the red liquid of boiling, ammonium lignin sulfonate is important fertilizer, and sodium lignosulfonate is important industrial chemicals, is the important source of finance of factory.
Accompanying drawing explanation
Fig. 1 is sulfite cooking flow chart.
Detailed description of the invention
Below in conjunction with testing program, result of study and embodiment, the present invention is described further, but the scope of protection of present invention is not limited thereto.
Embodiment 1
Add 20L service water in cooking liquor preparation bottle, take 300g carbonic hydroammonium, be dissolved in plant water, rock accelerate dissolution, pass into sulfur dioxide gas, control gas flow, suitably rock, accelerate the reaction of alkali uniform dissolution, promote carbon dioxide effusion, measure total acid and the free acid of cooking liquor, calculate combined acid, until total acid 6%, combined acid 1.5%, stops passing into sulfur dioxide;
Boiling raw material choose boiling raw material choose pine good timber, section specification is length 12 ~ 17mm, thickness 2 ~ 4mm, widths affect is little, rejects comparatively chump and wood chip, with factory's water washing wood chip, removing non-fiber impurity, make wood chip keep moisture 60%, accelerate liquid and soak into, favourable for early stage to boiling;
Chip filling amount is 6kg, adds and press-fits pot, and pressure is 0.4MPa, liquor ratio is 1:5, and highest pressure is 0.8MPa, maintains highest pressure during boiling by not parking gas, adopt two sections of boilings, one period of heating-up time is 4h, and one section of temperature retention time is 3h, one section of holding temperature 105 DEG C, two periods of heating-up times are 3h, and two sections of temperature retention times are 20h, and two sections of holding temperatures are 130 DEG C, for maximum temperature, total cooking time is 30h;
Judge terminal by the combined acid in the residual acid of red liquid, terminal combined acid is 0.15%, and also by comparison red liquid color auxiliary judgement terminal, compare with optimal set or upper one group of red liquid, reaching the equal colors degree of depth can put pot.
Embodiment 2
Add 20L service water in cooking liquor preparation bottle, take 320g sodium carbonate, be dissolved in plant water, rock accelerate dissolution, pass into sulfur dioxide gas, control gas flow, suitably rock, accelerate the reaction of alkali uniform dissolution, promote carbon dioxide effusion, measure total acid and the free acid of cooking liquor, calculate combined acid, until total acid 5.9%, combined acid 1.4%, stops passing into sulfur dioxide;
Boiling raw material choose pine leftover pieces, section specification is length 12 ~ 17mm, thickness 2 ~ 4mm, and widths affect is little, reject comparatively chump and wood chip, with factory's water washing wood chip, removing non-fiber impurity, make wood chip keep moisture 59%, accelerate liquid and soak into, favourable for early stage to boiling;
Chip filling amount is 5.9kg, adds and press-fits pot, and pressure is 0.7MPa, liquor ratio is 1:6, and highest pressure is 0.8MPa, maintains highest pressure during boiling by not parking gas, adopt two sections of boilings, one period of heating-up time is 4h, and one section of temperature retention time is 3h, one section of holding temperature 105 DEG C, two periods of heating-up times are 3h, and two sections of temperature retention times are 21h, and two sections of holding temperatures are 129 DEG C, for maximum temperature, total cooking time is 31h;
Judge terminal by the combined acid in the residual acid of red liquid, terminal combined acid is 0.13%, and also by comparison red liquid color auxiliary judgement terminal, compare with optimal set or upper one group of red liquid, reaching the equal colors degree of depth can put pot.
Embodiment 3
Add 20L service water in cooking liquor preparation bottle, take 280g carbonic hydroammonium, be dissolved in plant water, rock accelerate dissolution, pass into sulfur dioxide gas, control gas flow, suitably rock, accelerate the reaction of alkali uniform dissolution, promote carbon dioxide effusion, measure total acid and the free acid of cooking liquor, calculate combined acid, until total acid 6%, combined acid 1.4%, stops passing into sulfur dioxide;
Boiling raw material choose pine good timber, section specification is length 12 ~ 17mm, thickness 2 ~ 4mm, and widths affect is little, reject comparatively chump and wood chip, with factory's water washing wood chip, removing non-fiber impurity, make wood chip keep moisture 55%, accelerate liquid and soak into, favourable for early stage to boiling;
Chip filling amount is 5.5kg, adds and press-fits pot, and pressure is 0.5MPa, liquor ratio is 1:6, and highest pressure is 0.8MPa, maintains highest pressure during boiling by not parking gas, adopt two sections of boilings, one period of heating-up time is 4h, and one section of temperature retention time is 3h, one section of holding temperature 105 DEG C, two periods of heating-up times are 3h, and two sections of temperature retention times are 19h, and two sections of holding temperatures are 130 DEG C, for maximum temperature, total cooking time is 29h;
Judge terminal by the combined acid in the residual acid of red liquid, terminal combined acid is 0.11%, and also by comparison red liquid color auxiliary judgement terminal, compare with optimal set or upper one group of red liquid, reaching the equal colors degree of depth can put pot.
Claims (5)
1. a pulping process for extraordinary pulp, is characterized in that, comprises following step:
(1) preparation of cooking liquor: adopt sulfite pulping process, utilize soluble base sodium base or ammonium salt base, added by alkali in plant water, pass into sulfur dioxide gas, cooking liquor consists of total acid 3 ~ 6%, combined acid 0.8 ~ 1.5%;
(2) selection, washing wood chip: boiling raw material choose pine good timber or pine leftover pieces, washing wood chip removing non-fiber impurity and bark, make wood chip keep the moisture of 30 ~ 60%, liquid soaks into acceleration, favourable for early stage to boiling;
(3) fill pot boiling: add and press-fit pot, dress pot pressure is 0.4 ~ 0.8MPa, and liquor ratio is 1:(5 ~ 6.8), highest pressure is 0.8MPa, maintaining highest pressure, adopting two sections of boilings during boiling by not parking gas, one period of heating-up time is 2 ~ 4h, one section of temperature retention time is 1 ~ 3h, and one section of holding temperature is 103 ~ 105 DEG C, and two periods of heating-up times are 1 ~ 3h, two sections of temperature retention times are 15 ~ 25h, two sections of holding temperatures are 108 ~ 130 DEG C, are maximum temperature of cooking, and total cooking time is 19 ~ 35h;
(4) terminal point determining: judge terminal by the combined acid in the residual acid of red liquid, terminal combined acid is 0.15 ~-0.35%, also by comparison red liquid color auxiliary judgement terminal, compare with optimal set or upper one group of red liquid, reaching the equal colors degree of depth can put pot.
2. the pulping process of a kind of extraordinary pulp according to claim 1, is characterized in that in described step (2), wood chip section specification is length 12 ~ 17mm, thickness 2 ~ 4mm.
3. the pulping process of a kind of extraordinary pulp according to claim 1, is characterized in that in described step (3), chip filling amount is 4 ~ 6kg, is determined by digester capacity and wood chip moisture.
4. the pulping process of a kind of extraordinary pulp according to claim 1, is characterized in that the pulp after putting pot also will carry out discongesting, screen and drying, and sieve seam is 0.5mm.
5. the pulping process of a kind of extraordinary pulp according to claim 1, it is characterized in that the pulp degree of polymerization prepared is greater than 2000, bleachability is 30 ~ 50%, screened yield is 44 ~ 55%, through bleaching, cellulose ethers can be met, requirement that cellulose esters manufacturer produces high-viscosity products.
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| CN201510052897.7A CN104631173B (en) | 2015-02-02 | 2015-02-02 | A kind of pulping process of extraordinary pulp |
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| CN201510052897.7A CN104631173B (en) | 2015-02-02 | 2015-02-02 | A kind of pulping process of extraordinary pulp |
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| CN104631173A true CN104631173A (en) | 2015-05-20 |
| CN104631173B CN104631173B (en) | 2017-01-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109262783A (en) * | 2018-09-10 | 2019-01-25 | 华南协同创新研究院 | A kind of low temperature, atmospheric cooking prepare the method and its application of high-strength transparency cellulose thin-film material |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880981A (en) * | 2010-07-09 | 2010-11-10 | 延边石岘白麓纸业股份有限公司 | Method for making pulp |
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- 2015-02-02 CN CN201510052897.7A patent/CN104631173B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880981A (en) * | 2010-07-09 | 2010-11-10 | 延边石岘白麓纸业股份有限公司 | Method for making pulp |
Non-Patent Citations (2)
| Title |
|---|
| 窦正远等: "《制浆工艺学》", 31 May 1996 * |
| 谢来苏等: "《制浆原理与工程》", 31 May 2001 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109262783A (en) * | 2018-09-10 | 2019-01-25 | 华南协同创新研究院 | A kind of low temperature, atmospheric cooking prepare the method and its application of high-strength transparency cellulose thin-film material |
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| CN104631173B (en) | 2017-01-04 |
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