CN109930417A - A kind of recoverying and utilizing method of cold alkali density waste liquid - Google Patents
A kind of recoverying and utilizing method of cold alkali density waste liquid Download PDFInfo
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- CN109930417A CN109930417A CN201711361790.6A CN201711361790A CN109930417A CN 109930417 A CN109930417 A CN 109930417A CN 201711361790 A CN201711361790 A CN 201711361790A CN 109930417 A CN109930417 A CN 109930417A
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- waste liquid
- cold alkali
- alkali density
- density waste
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Abstract
The invention discloses a kind of methods that cold alkali density devil liquor recovery recycles, utilize the lye and hemicellulose in cold alkali density waste liquid, it is mixed with other conventional bleaching chemicals, additive, is applied to hydrogen peroxide bleaching technique, prepared bleached pulp performance is starched better than general hydrogen peroxide bleaching.
Description
Technical field
The present invention relates to a kind of method that cold alkali density devil liquor recovery recycles, particular technique is related to pulping and paper-making field.
Background technique
Dissolving pulp is that a kind of content of cellulose is up to 90-99%, contains only a small amount of hemicellulose (2-4%) and micro wooden
The high purity cellulose carrier of element and extract, minerals is the primary raw material for obtaining high purity cellulose in addition to cotton at present.
Weaving, food, daily use chemicals, pharmacy have been widely used in it using cellulose derivative/functional material that dissolving pulp is produced as raw material
Etc. various industries field, become most have potential substitution the petroleum base raw material of industry one of green material.
Cellulose purity is the primary quality index of dissolving pulp, and the height of cellulose purity decides cellulose-derived products
Quality, while influence dissolving pulp downstream product production in processing performance.Dissolving pulp containing 90-96% alpha-cellulose
The products such as viscose rayon, glassine paper, Lyocell fiber can be produced；And acetate fiber, nitrocellulose are produced etc. to cellulose purity
It is required that high product, alpha-cellulose dimension cellulose content is generally greater than 96%.As a kind of effective means of purifying dissolving pulp, cold alkali
Extracting is a kind of run-inflation effect for (being lower than 40 DEG C) using lye to fibre structure under cryogenic, and physical dissolution goes out short chain carbon
Hydrate (usually hemicellulose), thus the method for improving slurry alpha-cellulose content.Its advantage outstanding is embodied in place
The yield loss of slurry is smaller after reason, and the consumption of lye is low, and resulting slurry purity is higher；But meanwhile cold alkali density waste liquid
Alkali dense is higher (generally greater than 10%), is the weight for promoting cold alkali density technique how effectively by cold alkali density waste liquid recycling
Want technical problem.Another feature of cold alkali density waste liquid is embodied in it and contains a certain amount of hemicellulose components, and hemicellulose
It can be used as additive to be added in paper pulp, effectively improve beating rate, improve the physics such as fracture length, bursting strength and the folding strength of paper
Index.It can be considered to by cold alkali density thin stillage recycling in soda pulping process, drift etc. in techniques, alkali needed for technique was both provided
Liquid source, while improving the indexs such as fibre strength performance.
In paper pulp bleaching process, hydrogen peroxide is usually used in the final stage of multistage bleaching, and bleaches completely without chlorine (TCF)
Indispensable part.In bleaching process, hydrogen peroxide while can also decompose carbohydrate with lignin reaction, because
This chemical pulp pulp viscosity and intensity after hydrogen peroxide bleaching decrease.In addition, bleaching of the basicity to hydrogen peroxide
Efficiency plays decisive role, and enough basicity can guarantee that hydrogen peroxide plays useful effect in ionization process.It is based on
The demand lost in hydrogen peroxide bleaching to pulp strength after the demand of basicity and reduction bleaching, the present invention are existing cold in utilizing
The characteristics of alkali density waste liquid, is applied in paper pulp Alkali Hydrogen Peroxide System, explores the way that cold alkali density devil liquor recovery utilizes
Diameter.
Summary of the invention
The present invention is using cold alkali density waste liquid as the main source of basicity, and conventional bleaching chemical, additive are mixed with other
After conjunction, it is applied to hydrogen peroxide bleaching technique, prepared bleached pulp performance is starched better than general hydrogen peroxide bleaching.Concrete operations
Method is as follows:
(1) preparation of cold alkali density waste liquid: at 20~40 DEG C of temperature, alkali dense 10~30%；Dense 10~30% are starched, when extracting
Between commerical grade kraft pulp is stripped under the conditions of 1~3h after, the lye after collecting extracting, and being concentrated by filter membrane
50~80% to original solution volume are stand-by；
(2) it reagent preparation: regard the cold alkali density waste liquid (1) after concentration as alkali source, pipettes and be equivalent to 2~10%
The basicity of NaOH additive amount, with sodium metasilicate 1~3%, magnesium sulfate 0.01~0.1%, EDTA 0.1~0.5% (is equivalent to over dry
Slurry) it is uniformly mixed for use；
(3) brown stock is bleached: the reagent prepared (2) is poured into brown stock, addition bleaching chemical hydrogen peroxide 4~
10% (being equivalent to over dry slurry), is bleached under 70~90 DEG C, 80~160min after mixing, after bleached
Slurry carries out quality testing, is compared with the bleached pulp of general lye is used.
Present invention is characterized in that
(1) paper pulp bleaching is carried out by alkali source of cold alkali density waste liquid, provides not only required basicity in bleaching process,
The intensity of bleached pulp is effectively improved simultaneously；
(2) this experiment is based on general paper pulp bleaching process, and production generalization is strong, while solving the useless of cold alkali density technique
Liquid recycles problem.
Specific embodiment
Below with reference to embodiment, more detailed introduction is done to the present invention:
Embodiment 1:
At 25 DEG C of temperature, alkali dense 10% is starched dense 15%, is carried out under the conditions of extraction times 1h to bleached sulphate hardwood pulp
After extracting, lye after collecting extracting, and be concentrated into the 80% of original solution volume for use by filter membrane；
It is 10% stand-by that natural color pulp, which is prepared slurry concentration,；The reagent mixed is added: being equivalent to 4%NaOH additive amount
Cold alkali density waste liquid, Na2SiO32%, MgSO40.05%, EDTA 0.2% (in terms of oven dry stock quality), are eventually adding H2O26%
(in terms of oven dry stock quality), is bleached under 85 DEG C, 120min after mixing, and bleached pulp is carried out object after the completion of processing
Inspection；It is found after being compared with the bleached pulp of general lye is used, with the pi of strength for the paper pulp that cold alkali extract is bleached
There is rising, wherein tensile strength promotes 17%.
Embodiment 2:
At 30 DEG C of temperature, alkali dense 15% is starched dense 10%, is carried out under the conditions of extraction times 2h to bleached sulphate softwood pulp
After extracting, lye after collecting extracting, and be concentrated into the 50% of original solution volume for use by filter membrane；
It is 10% stand-by that natural color pulp, which is prepared slurry concentration,；The reagent mixed is added: being equivalent to 4%NaOH additive amount
Cold alkali density waste liquid, Na2SiO32%, MgSO40.05%, EDTA 0.2% (in terms of oven dry stock quality), are eventually adding H2O26%
(in terms of oven dry stock quality), is bleached under 85 DEG C, 120min after mixing, and bleached pulp is carried out object after the completion of processing
Inspection；It is found after being compared with the bleached pulp of general lye is used, with the pi of strength for the paper pulp that cold alkali extract is bleached
There is rising, wherein tensile strength promotes 25%.
Above embodiments bleached pulp is after paper physical detects, pi of strength (especially tensile strength index)
It is obviously improved, performance is better than traditional hydrogen peroxide bleaching slurry.
Claims (4)
1. a kind of recycling and reusing method of cold alkali density waste liquid, it is characterised in that utilize the lye and half in cold alkali density waste liquid
Cellulose components after mixing with other conventional bleaching chemicals, additive, are applied to hydrogen peroxide bleaching technique, specific to wrap
Include following steps:
(1) preparation of cold alkali density waste liquid: at 20~40 DEG C of temperature, alkali dense 10~30%；Dense 10~30% are starched, extraction times 1
Commerical grade kraft pulp is stripped under the conditions of~3h, the lye after collecting extracting, and carries out being concentrated into original by filter membrane
The 50~80% of liquor capacity are stand-by；
(2) it reagent preparation: regard the cold alkali density waste liquid (1) after concentration as alkali source, pipettes and be equivalent to 2~10%NaOH and add
The basicity of dosage, with sodium metasilicate 1~3%, magnesium sulfate 0.01~0.1%, EDTA 0.1~0.5% (being equivalent to over dry slurry) is mixed
It closes uniformly stand-by；
(3) brown stock is bleached: the reagent prepared (2) being poured into brown stock, bleaching chemical hydrogen peroxide 4~10% is added
(being equivalent to over dry slurry) is bleached to obtain bleached pulp after mixing under 70~90 DEG C, 80~160min.
2. a kind of recycling and reusing method of cold alkali density waste liquid as described in claim 1, it is characterised in that step (1) is described
Cold alkali density waste liquid need to recycle after film process is concentrated.
3. a kind of recycling and reusing method of cold alkali density waste liquid as described in claim 1, it is characterised in that with cold alkali density
Waste liquid is that alkali source is bleached, wherein the hemicellulose contained can effectively be adsorbed on the fiber surface of slurry, improves pulp strength.
4. a kind of recycling and reusing method of cold alkali density waste liquid as described in claim 1, it is characterised in that the bleaching process
Production generalization it is strong, for cold alkali density technique devil liquor recovery using providing effective way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711361790.6A CN109930417A (en) | 2017-12-15 | 2017-12-15 | A kind of recoverying and utilizing method of cold alkali density waste liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711361790.6A CN109930417A (en) | 2017-12-15 | 2017-12-15 | A kind of recoverying and utilizing method of cold alkali density waste liquid |
Publications (1)
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| CN109930417A true CN109930417A (en) | 2019-06-25 |
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ID=66982253
Family Applications (1)
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| CN201711361790.6A Pending CN109930417A (en) | 2017-12-15 | 2017-12-15 | A kind of recoverying and utilizing method of cold alkali density waste liquid |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844564A (en) * | 2006-04-30 | 2006-10-11 | 华南理工大学 | Method for bleaching middle and thick paper pulp by hydrogen peroxide and through double bleaching tower |
| CN101446054A (en) * | 2008-12-23 | 2009-06-03 | 华南理工大学 | Total-chlorine-free bleaching method of paper pulp production line with annual output of more than 50,000 tons |
| CN102182094A (en) * | 2011-04-12 | 2011-09-14 | 山东轻工业学院 | Salix mongolica sulfate pulp bleaching process |
| CN102242512A (en) * | 2011-04-30 | 2011-11-16 | 李刚荣 | Environmentally-friendly paper making and pulping technique and system with high yield |
| CN102587186A (en) * | 2012-03-20 | 2012-07-18 | 昆明理工大学 | Method for bleaching dendrocalamus giganteus chemical pulp |
| CN102985610A (en) * | 2010-05-04 | 2013-03-20 | 巴伊亚特种纤维素公司 | Method and system for pulp processing using cold caustic extraction with alkaline filtrate reuse |
| CN103174045A (en) * | 2013-03-28 | 2013-06-26 | 昆明理工大学 | Production method of bark-forming handmade paper bleaching pulp |
-
2017
- 2017-12-15 CN CN201711361790.6A patent/CN109930417A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844564A (en) * | 2006-04-30 | 2006-10-11 | 华南理工大学 | Method for bleaching middle and thick paper pulp by hydrogen peroxide and through double bleaching tower |
| CN101446054A (en) * | 2008-12-23 | 2009-06-03 | 华南理工大学 | Total-chlorine-free bleaching method of paper pulp production line with annual output of more than 50,000 tons |
| CN102985610A (en) * | 2010-05-04 | 2013-03-20 | 巴伊亚特种纤维素公司 | Method and system for pulp processing using cold caustic extraction with alkaline filtrate reuse |
| CN102182094A (en) * | 2011-04-12 | 2011-09-14 | 山东轻工业学院 | Salix mongolica sulfate pulp bleaching process |
| CN102242512A (en) * | 2011-04-30 | 2011-11-16 | 李刚荣 | Environmentally-friendly paper making and pulping technique and system with high yield |
| CN102587186A (en) * | 2012-03-20 | 2012-07-18 | 昆明理工大学 | Method for bleaching dendrocalamus giganteus chemical pulp |
| CN103174045A (en) * | 2013-03-28 | 2013-06-26 | 昆明理工大学 | Production method of bark-forming handmade paper bleaching pulp |
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Application publication date: 20190625 |
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