CN100528752C - Method for reclaiming lignin and alkali from boiling black liquor - Google Patents
Method for reclaiming lignin and alkali from boiling black liquor Download PDFInfo
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- CN100528752C CN100528752C CNB2007100357555A CN200710035755A CN100528752C CN 100528752 C CN100528752 C CN 100528752C CN B2007100357555 A CNB2007100357555 A CN B2007100357555A CN 200710035755 A CN200710035755 A CN 200710035755A CN 100528752 C CN100528752 C CN 100528752C
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- lignin
- alkali
- black liquor
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- liquor
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Abstract
The invention relates to a method for reclaiming lignin and alkali from steamed black liquor in chemical pulping. The invention adopts addition of H2SO4 solution into the black liquor to precipitate lignin thereof, and after separation, eylogen with high added value is obtained; then NaOH solution is added into the black liquor to adjust the pH value followed by procedures such as evaporation, combustion, causticization, etc. to reclaim alkali and heat energy. The added H2SO4 reacts with NaOH to produce Na2SO4, which can partially or completely substitute replenished mirabilite in the process of alkali reclamation and then transform into NaOH and Na2S for reuse as steaming drugs in production. The invention solves the problems that the combustion method for reclamation of alkali and heat energy from the black liquor does not rationally utilize the lignin resource thereof, and the alkali and the heat energy in the black liquor are not rationally reclaimed in the traditional acid extracting lignin process, as well as waster liquor is difficult to dispose further. The invention has prominent social, environmental and economic benefits; additionally, the method of the invention does not produce harmful substances and has no secondary pollution.
Description
Technical field:
The present invention relates to a kind of method that from alkaline process chemical pulping black digestion liquid, reclaims lignin and alkali.
Background technology:
The cooking waste liquor of alkaline process chemical pulping gained is called black liquor, and the solid substance in the black liquor comprises organism and inorganics, and organism mainly is the degraded product of lignin and carbohydrate, and inorganics mainly is NaOH and the Na that adds in the digestion process
2The converted product of S.Wherein lignin accounts for 25%～35% of black liquor solid weight, and chemical pulp per ton can produce 0.45～0.55 ton of lignin.Lignin is a kind of Chemicals of high added value, has been widely used as tensio-active agent, tackiness agent, flocculation agent, dispersion agent, cement water reducing agent, gac, dye additive, rubber accelerator etc., and the existing market price is 2500～3000 yuan/ton; Circulation was used for digestion process after inorganics also can adopt suitable method to reclaim in the black liquor.If but black liquor directly to be discharged, its pollution is very serious, and black liquor accounts for 90% of pulping and paper-making pollution load that whole process produces to the pollution load of water body.Therefore, black liquor both rationally recycled to make full use of resource, can protect environment again.
The method of the black digestion liquid of research and development recycling at present is many, as: Silvola recovery (combustion method), lignin acidizing separation method, electroosmose process, membrane separation process, hygrochase solution, biochemical process etc.
Silvola recovery is the most ripe, the most widely used method in the black digestion liquid recycling technology, this method is through processes such as burning, causticization and white clay recovery after black liquor vaporizing is concentrated, make the organism in the black liquor change into heat energy recovery in production process, inorganics changes into NaOH and Na
2The S circulation is used for boiling, and black liquor must add saltcake to replenish sulphur and the sodium that loses in slurrying and the alkali recovery process before entering roasting kiln.The calorific value of lignin is about 2/3 of standard coal, and the market value of coal is 300～500 yuan/ton at present.This method is separated utilization with the lignin that has high added value in the black liquor, but with its fuel combustion as low value, therefore, does not sufficiently and reasonably utilize the lignin resource in the black liquor.
The lignin acidizing separation method is to add acid, SO in black digestion liquid
2Or stack gas, the pH value of black liquor is reduced, the lignin precipitation in the black liquor is separated out, and obtains lignin products.The method that black liquor behind the lignin acidizing separation is handled of research at present mainly contains interpolation lime slurry Silvola recovery, anaerobic-aerobic biological treatment, membrane filter method, flocculent precipitation etc.Wherein, there are the following problems to add the lime slurry Silvola recovery: 1. organically combine sodium and can not change into NaOH, do not realize Na
2The circulation of S; 2. do not remove the degraded product of carbohydrate from black liquor, the filtrate of recovery can not recycle; 3. process generates more Ca
2SO
4Precipitation can not be sintered into the unslaked lime cyclically utilizing, can not realize that therefore alkali truly reclaims; The treatment process of black liquor does not have and can apply industrial in technology or there are some problems economically yet behind other lignin acidizing separation.Therefore, how to handle economically that the problem of black liquor also is not resolved at present behind the lignin acidizing separation.
Summary of the invention:
The object of the present invention is to provide and a kind ofly both can reclaim the lignin products that has high added value in the black liquor, can reclaim alkali in the black liquor and heat energy recovery the industrialized black digestion liquid treatment process that is easy to again in the economical rationality of production process.
The objective of the invention is to realize by following approach: a kind of method that reclaims lignin and alkali from black digestion liquid is to use earlier H
2SO
4The solution acid lignin reclaims the lignin products that has high added value in the black digestion liquid; After then regulating black liquor pH value, through processes such as pervaporation, burning, causticization, white clay recovery recovery alkali and heat energy wherein with NaOH.In lignin acidizing separation and alkali N-process, be used to regulate the H that the pH value adds
2SO
4Reaction generates Na with NaOH
2SO
4, can partly or entirely replace the saltcake of adding in the alkali recovery process, in alkali recovery process, change into NaOH and Na
2S, as boiling medicine cyclically utilizing in production.Concrete implementation step is as follows:
1) lignin acidizing separation: the black liquor that wash hollander extracts is pumped into the acid out pond, and the adding weight ratio is 2%～80% H in the acid out pond
2SO
4Solution, pH≤6.0 of adjusting black liquor, behind reaction 10～40min, the lignin precipitation in the black liquor is separated out, and obtains lignin products after washing, dehydration, drying, and clear liquid is with being pumped into the alkali neutralization tank;
2) alkali neutralization: adding concentration in neutralization tank is the NaOH solution of 5～200g/L, pH 〉=7.0 of black liquor behind the adjusting lignin acidizing separation, and reaction times 10～30min is pumped into the rare black liquor groove of evaporation section then; The H that NaOH that adds and lignin acidizing separation add
2SO
4Reaction generates Na
2SO
4, can partly or entirely replace the saltcake of adding in the alkali recovery process;
3) evaporation: the rare black liquor of pumping is delivered to evaporator inlet, and the board-like or tubular evaparator of multiple-effect is adopted in evaporation, and used vapor pressure is 0.1～0.5MPa, and evaporation back black liquor is concentrated to 35%～75% solid content;
4) burning: the black liquor after the evaporation concentration is delivered to roasting kiln, and 750～1200 ℃ of burnings, the inorganics in the black liquor changes into melts, and its major ingredient is Na
2CO
3And Na
2S, inorganic melts enters into dissolving tank by chute, adds rare white liquid therein, obtains the green liquor that concentration is 60～180g/L, and organism is used for production process after changing into the form recovery of heat energy with steam;
5) causticization: with pump the green liquor of dissolving tank is sent into clarifying tank, the supernatant liquid after the clarification is a green liquor, with pump green liquor is sent into the digestion causticization reactor, and adds unslaked lime therein and carry out causticization, makes wherein Na
2CO
3Be converted into NaOH and CaCO
3Precipitation, the white liquid after the causticization be with being pumped into white liquor clarifier, and the supernatant liquid that obtains is the white liquid of 70～95 ℃ of concentration 60～180g/L, temperature, and its major ingredient is NaOH and Na
2S, white liquid is with being pumped into white liquid storagetank, and as cooking liquor, sediment is a white clay, and its major ingredient is CaCO
3
6) white clay reclaims: white clay its solid content after washing, filtration is delivered in the limestone kiln and is calcined 30%～60%, and calcining temperature is 800～1300 ℃, obtains unslaked lime, is used for the causticization of green liquor, and white clay also can be used for being prepared into papermaking filler.
The present invention compared with prior art has following advantage:
1) at first reclaims the lignin products of high added value in the black digestion liquid, and then recovery alkali and heat energy wherein, sufficiently and reasonably utilized the black liquor resource, compare with existing black liquor alkali reclaiming method, the recovery profit that this method can make boiling paper pulp per ton produce black liquor increases more than 1000 yuan, remarkable in economical benefits;
2) lignin acidizing separation uses H
2SO
4Solution, NaOH solution, the H of above-mentioned adding are used in the adjusting of black liquor pH value thereafter
2SO
4Reaction generates Na with NaOH
2SO
4, can partly or entirely replace the saltcake of adding in the alkali recovery process, in alkali recovery process, change into NaOH and Na
2S, circulation is used for producing as the boiling medicine;
3) handle the later black liquor of lignin acidizing separation with combustion method, reclaim wherein alkali and heat energy, technology maturation, economical rationality;
4) the inventive method can not produce objectionable impurities, non-secondary pollution.
Embodiment 1
With temperature is that 80 ℃, concentration are that 10 Baumes, pH value are that 14 Pinus massoniana Lamb sulfate pulp black digestion liquid is with being pumped into 200m
3The lignin acidizing separation pond in, adding concentration at its pipeline exit is 10% H
2SO
4Solution is regulated the pH=5.5 of black liquor, and behind the reaction 20min, the lignin precipitation in the black liquor is separated out, and obtains lignin products after washing, centrifuge dehydration, warm air drying.Clear liquid is with being pumped into 200m
3The alkali neutralization tank, adding concentration at pipe outlet is the pH=7.5 that the NaOH solution of 60g/L is regulated black liquor, is pumped into the rare black liquor groove of evaporation section behind the reaction times 10min; With pump rare black liquor is delivered to 5 and imitate the mixed flow plate-type evaporator, concentrated black liquor is to solid content 60%; Black liquor after concentrating is delivered to the spray combustion stove, and 1050 ℃ of burnings, the inorganics in the black liquor changes into melts, enter into dissolving tank by chute, add rare white liquid therein, obtain the green liquor that concentration is 100g/L, organism changes into the form recovery of heat energy with steam, is back to production process; With pump the dissolving tank green liquor is sent into clarifying tank, green liquor after the clarification is pumped into the digestion causticization reactor, and add unslaked lime therein and carry out causticization, white liquid after the causticization is with being pumped into white liquor clarifier, obtain the white liquid of 80 ℃ of concentration 105g/L, temperature, with being pumped into white liquid storagetank, cooking liquor is made in reuse; White clay through washing, filter after its solid content 40%, deliver in the limestone kiln 1000 ℃ of calcinings, obtain unslaked lime, be back to green liquor causticizing.
Embodiment 2
With temperature is that 75 ℃, concentration are that 11 Baumes, pH value are that 14 Eucalyptus sulfate pulp black digestion liquid is with being pumped into 150m
3The lignin acidizing separation pond in, adding concentration at its pipeline exit is 15% H
2SO
4Solution is regulated the pH=4.5 of black liquor, and behind the reaction 25min, the lignin precipitation in the black liquor is separated out, and obtains lignin products after washing, filter-press dehydration, infrared drying.Clear liquid is with being pumped into 150m
3The alkali neutralization tank, adding concentration at pipe outlet is the pH=7.2 that the NaOH solution of 100g/L is regulated black liquor, is pumped into the rare black liquor groove of evaporation section behind the reaction times 15min; With pump rare black liquor is delivered to 5 and imitate mixed flow tubular evaparator, concentrated black liquor concentration solid content 65%; Black liquor after concentrating is delivered to the spray combustion stove, and 1000 ℃ of burnings, the inorganics in the black liquor changes into melts, enter into dissolving tank by chute, add rare white liquid therein, obtain the green liquor that concentration is 90g/L, organism changes into the form recovery of heat energy with steam, is back to production process; With pump the dissolving tank green liquor is sent into clarifying tank, green liquor after the clarification is pumped into the digestion causticization reactor, and add unslaked lime therein and carry out causticization, white liquid after the causticization is with being pumped into white liquor clarifier, obtain the white liquid of 85 ℃ of concentration 95g/L, temperature, with being pumped into white liquid storagetank, cooking liquor is made in reuse; White clay through washing, filter after its solid content 38%, deliver in the limestone kiln 1100 ℃ of calcinings, obtain unslaked lime, be back to green liquor causticizing.
Embodiment 3
With temperature is that 85 ℃, concentration are that 12 Baumes, pH value are that 14 poplar sulfate pulp black digestion liquid is with being pumped into 180m
3The lignin acidizing separation pond in, adding concentration at its pipeline exit is 20% H
2SO
4Solution is regulated the pH=5.0 of black liquor, and behind the reaction 20min, the lignin precipitation in the black liquor is separated out, and obtains lignin products after washing, centrifuge dehydration, warm air drying.Clear liquid is with being pumped into 180m
3The alkali neutralization tank, adding concentration at pipe outlet is the pH=7.1 that the NaOH solution of 150g/L is regulated black liquor, is pumped into the rare black liquor groove of evaporation section behind the reaction times 16min; With pump rare black liquor is delivered to 5 and imitate mixed flow plate-type evaporator, concentrated black liquor concentration solid content 68%; Black liquor after concentrating is delivered to fluid-bed combustion furnace, and 820 ℃ of burnings, the inorganics in the black liquor changes into melts, enter into dissolving tank by chute, add rare white liquid therein, obtain the green liquor that concentration is 92g/L, organism changes into the form recovery of heat energy with steam, is back to production process; With pump the dissolving tank green liquor is sent into clarifying tank, green liquor after the clarification is pumped into the digestion causticization reactor, and add unslaked lime therein and carry out causticization, white liquid after the causticization is with being pumped into white liquor clarifier, obtain the white liquid of 82 ℃ of concentration 96g/L, temperature, with being pumped into white liquid storagetank, cooking liquor is made in reuse; White clay through washing, filter after its solid content 36%, deliver in the limestone kiln 105 ℃ of calcinings, obtain unslaked lime, be back to green liquor causticizing.
Embodiment 4
With temperature is that 75 ℃, concentration are that 8 Baumes, pH value are that 14 reed sulfate pulp black digestion liquid is with being pumped into 120m
3The lignin acidizing separation pond in, adding concentration at its pipeline exit is 25% H
2SO
4Solution is regulated the pH=4.8 of black liquor, and behind the reaction 25min, the lignin precipitation in the black liquor is separated out, and obtains lignin products after washing, filter-press dehydration, infrared drying.Clear liquid is with being pumped into 120m
3The alkali neutralization tank, adding concentration at pipe outlet is the pH=7.5 that the NaOH solution of 200g/L is regulated black liquor, is pumped into the rare black liquor groove of evaporation section behind the reaction times 12min; With pump rare black liquor is delivered to 5 and imitate the mixed flow plate-type evaporator, concentrated black liquor is to solid content 40%; Black liquor after concentrating is delivered to fluid-bed combustion furnace, and 850 ℃ of burnings, the inorganics in the black liquor changes into melts, enter into dissolving tank by chute, add rare white liquid therein, obtain the green liquor that concentration is 85g/L, organism changes into the form recovery of heat energy with steam, is back to production process; With pump the dissolving tank green liquor is sent into clarifying tank, green liquor after the clarification is pumped into the digestion causticization reactor, and add unslaked lime therein and carry out causticization, white liquid after the causticization is with being pumped into white liquor clarifier, obtain the white liquid of 80 ℃ of concentration 85g/L, temperature, with being pumped into white liquid storagetank, cooking liquor is made in reuse; White clay its solid content after washing, filtration can be used for preparing the paper grade (stock) filler 35%.
Claims (3)
1, a kind of method that reclaims lignin and alkali from black digestion liquid is characterized in that comprising the steps:
1) lignin acidizing separation: under 60～95 ℃ of conditions of temperature be 2%～80% H with weight ratio
2SO
4Solution is regulated pH≤6.0 with black digestion liquid, and the lignin precipitation in the black liquor is separated out, and obtains lignin products after washing, dehydration, drying;
2) alkali neutralization: regulating pH 〉=7.0, the H of the NaOH of adding and lignin acidizing separation adding with the NaOH solution of the 5～200g/L black liquor after with lignin acidizing separation under 60～90 ℃ of conditions of temperature
2SO
4Reaction generates Na
2SO
4, can partly or entirely replace the saltcake of adding in the alkali recovery process;
3) evaporation, burning, causticization: lignin acidizing separation and the black liquor vaporizing after NaOH regulates the pH value are concentrated in vaporizer with steam, the black liquor after concentrating is delivered to the roasting kiln burning, and the inorganics in the black liquor changes into Na
2CO
3And Na
2S adds unslaked lime therein and carries out causticization after the dissolving, obtaining major ingredient is NaOH and Na
2The white liquid of S is as the cooking liquor cyclically utilizing; Organism in the black liquor changes into heat energy and recycles with the form of steam.
2, a kind of method that from black digestion liquid, reclaims lignin and alkali according to claim 1, it is characterized in that: the lignin products that reclaims high added value in the black digestion liquid earlier with the method for lignin acidizing separation, after then regulating black liquor pH value, through pervaporation, burning, causticization, white clay removal process, reclaim wherein alkali and heat energy.
3, a kind of method that reclaims lignin and alkali from black digestion liquid according to claim 1 is characterized in that: in lignin acidizing separation and alkali N-process, be used to regulate the H that the pH value adds
2SO
4Reaction generates Na with NaOH
2SO
4, for replenishing the saltcake that the sulphur that loses in slurrying and the alkali recovery process and sodium are added, change into NaOH and Na in the time of can partly or entirely replacing alkali and reclaim
2S, circulation is used for producing as the boiling medicine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100357555A CN100528752C (en) | 2007-09-17 | 2007-09-17 | Method for reclaiming lignin and alkali from boiling black liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100357555A CN100528752C (en) | 2007-09-17 | 2007-09-17 | Method for reclaiming lignin and alkali from boiling black liquor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101157459A CN101157459A (en) | 2008-04-09 |
| CN100528752C true CN100528752C (en) | 2009-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100357555A Expired - Fee Related CN100528752C (en) | 2007-09-17 | 2007-09-17 | Method for reclaiming lignin and alkali from boiling black liquor |
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Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957315B (en) * | 2010-09-11 | 2012-02-15 | 大连工业大学 | Method for measuring lignin content in black liquor |
| CN102424437B (en) * | 2011-09-07 | 2013-06-26 | 宜宾丝丽雅集团有限公司 | Method for treating prehydrolysis liquid of bamboo dissolving pulp |
| CN102503990B (en) * | 2011-09-22 | 2014-07-30 | 华南理工大学 | Method for preparing surfactant by taking lignin thermo-chemically degraded phenol product as raw material |
| CN102877349B (en) * | 2012-09-29 | 2014-10-15 | 广西大学 | Circular treatment method of acid filtrate from pulping black liquor |
| CN102924728B (en) * | 2012-11-16 | 2014-12-03 | 湖南鸿鹰生物科技有限公司 | Method for preparing modified xylogen and applications thereof in wastewater treatment |
| CN103408010B (en) * | 2013-07-26 | 2016-05-11 | 福建农林大学 | A kind of black liquid that utilizes is prepared the method for active carbon for activating agent |
| US9574303B2 (en) * | 2015-06-01 | 2017-02-21 | Veolia Water Technologies, Inc. | Method of recovering pulping chemicals from dissolved ash having a high carbonate content |
| CN106830552B (en) * | 2017-03-09 | 2020-07-21 | 轻工业环境保护研究所 | Wet alkali recovery method for chemical pulp black liquor |
| CN108864441A (en) * | 2017-10-13 | 2018-11-23 | 济宁明升新材料有限公司 | A method of extracting lignin from reducing rules treatment fluid |
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| CN109748376A (en) * | 2019-01-31 | 2019-05-14 | 智造起源科技有限公司 | The supercritical water oxidation processing of alkaline paper plant waste water and resource recovering system and method |
| CN110934321B (en) * | 2020-01-07 | 2021-12-10 | 湖北中烟工业有限责任公司 | Method for preparing thermosensitive non-combustion tobacco sheet based on kraft lignin |
| CN111254741A (en) * | 2020-02-26 | 2020-06-09 | 上海昶法新材料有限公司 | Dry strength agent and preparation method and application thereof |
| CN115028247B (en) * | 2022-06-14 | 2023-12-22 | 齐鲁工业大学 | Guanidinoacetic acid modified lignin flocculant and preparation method thereof |
| CN114835916A (en) * | 2022-06-14 | 2022-08-02 | 齐鲁工业大学 | Threonine modified lignin flocculant and preparation method thereof |
| CN115043476A (en) * | 2022-06-24 | 2022-09-13 | 齐鲁工业大学 | Serine modified lignin flocculant and preparation method thereof |
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