CN107503213A - The hardwood black liquor for handling the method for hardwood black liquor and being handled according to this method - Google Patents
The hardwood black liquor for handling the method for hardwood black liquor and being handled according to this method Download PDFInfo
- Publication number
- CN107503213A CN107503213A CN201710860022.9A CN201710860022A CN107503213A CN 107503213 A CN107503213 A CN 107503213A CN 201710860022 A CN201710860022 A CN 201710860022A CN 107503213 A CN107503213 A CN 107503213A
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- Prior art keywords
- black liquor
- hardwood
- calcium
- temperature
- processing
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Classifications
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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
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/10—Concentrating spent liquor by evaporation
- D21C11/106—Prevention of incrustations on heating surfaces during the concentration, e.g. by elimination of the scale-forming substances contained in the liquors
-
- 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
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
-
- 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
The present invention relates to the method for processing hardwood black liquor and the hardwood black liquor handled according to this method.The present invention also handles the hardwood black liquor from bardwood pulp's manufacture to precipitate the method for the calcium compound being present in the liquid, wherein the described method comprises the following steps：Hardwood black liquor from bardwood pulp's manufacture is provided, and at least a portion of liquid described in the Temperature Treatment higher than 160 DEG C, wherein the calcium compound being present in black liquor will precipitate.The invention further relates to the hardwood black liquor handled according to methods described.
Description
The application be Application No. 201280043097.3, the applying date be on 08 28th, 2012, it is entitled " processing
The divisional application of the patent application of the method for hardwood black liquor and the hardwood black liquor handled according to this method ".
Technical field
The present invention relates to processing hardwood black liquor to prevent the method for undesirable fouling.The present invention also relates to according to the present invention
The hardwood black liquor of processing.
Background technology
In paper industry, it is desired amount of wooden to separate cellulose fiber peacekeeping removing that wood chip is handled in digester systems
Element etc. (fiber is bonded together by it in the native state of timber), for producing paper pulp.The use of alkali lye digestion wood chip is capable
Common practice in industry.During this process, it is common to wood chip and alkaline digest liquid are led into digester.After digestion process, point
From caused paper pulp and digestion black liquor with individually further processing.At this, point withdraws digestion black liquor from digester, Ran Houjin
The processing of one step is to reclaim useful component and/or the energy using liquid, preferably by burning it in recovery boiler.
Black liquor is flashed in multi-stage evaporation unit compared with high dry content to improve the efficiency of subsequent recycling step.
One in vaporising device common problem encountered is that the fouling of heating surface, it reduces heat transfer efficiency.This cause cap loss and
Higher running cost.In order that vaporising device is satisfactorily run, it is sometimes desirable to cleans hot surface.
It has been shown that calcium carbonate is the key component of surface smut in vaporising device.It has been shown that fully steamed typical
After boiling temperature or heating black liquor near typical abundant boiling temperature, the fouling tendency of calcium in boiling and/or black liquor
Drastically decline.This effect is referred to as into calcium caused by being heat-treated sometimes in the art to deactivate.The example description of this calcium deactivation
In the A1 of EP 0313730, which depict in abundant boiling temperature or near abundant boiling temperature, heating calcium content is high
Cooking liquor, it is kept a period of time in a reservoir in this temperature, typically longer than ten minutes, and make the warp containing " deactivation " calcium
The liquid of heat treatment is back to digester systems.Because dirt is formed on the surface of this " sacrifice " container, it usually needs extremely
For few two containers to maintain the continuous operation that calcium deactivates, it is clear that wherein at least one container carries out dirt with a container on line
Wash.This technology is probably effective, but needs extra fund and running cost, and therefore without real extensively in the industry
OK.
Processing black liquor is to suppress the description of another example of fouling in US 6,090,240, and which depict at 110-145 DEG C
Temperature heat treatment black liquor 1-20 minutes, to reduce the calcium amount in liquid by the calcium in precipitating liquid.In this patent, locate
Reason carrys out the black liquor of self-digestion cork.
In addition, the processing of black liquor describes Frederick's et al. " Preventing Calcium Carbonate
Scaling in Black Liquor Evaporators ", Part 2of 2, Southern Pulp and Paper
In Manufacturer/Sep.1979, pp.22-29.The processing is in 151 DEG C of progress.
In many countries, due to the preferable cost efficiency and availability of bardwood pulp, the market of bardwood pulp and make
With increasingly increasing.As a result, the generation of hardwood black liquor also increasingly increases, and therefore reclaims these liquid in a cost-effective manner
Component and the needs of energy also increasingly increase.One problem of recovery hardwood black liquor is that the high calcium in some hardwood species contains
Amount causes the high calcium content in black liquor, so as to cause the increased fouling in vaporising device.In addition, when processing hardwood black liquor
When, the usual heat treatment in 110-145 DEG C of temperature described in the prior art does not reduce amount of scale buildup.Moreover, and softwood pulp
Digestion compare, the digestion of bardwood pulp is generally carried out in relatively low boiling temperature.As the result of relatively low boiling temperature, in black liquor
The calcium amount of middle dissolving is still very high.During the digestion of softwood pulp, most of calcium will deactivate, and therefore solvable in black liquor
Property calcium amount reduce.During the digestion of bardwood pulp, boiling temperature is maintained at low temperature, because higher boiling temperature (for example,
Temperature higher than 155 DEG C) by reduce boiling during yield.
Therefore need to handle the improved method of hardwood black liquor, the problem of to reduce calcium compound such as calcium carbonate scaling.
The content of the invention
It is an object of the present invention to provide the method that scale problems are reduced during hardwood black liquor is evaporated.
It is a further object to provide the black liquor of the fouling tendency with reduction.
It is yet another object of the invention to provide the black liquor of the viscosity with reduction.
These purposes and other objects and advantages are realized by the method for claim 1.The present invention relates to processing to come from
The hardwood black liquor of bardwood pulp's manufacture includes following step with the method for calcium ion present in precipitating liquid, wherein methods described
Suddenly：There is provided the hardwood black liquor from bardwood pulp's manufacture and at least a portion of liquid described in the Temperature Treatment higher than 160 DEG C,
The calcium ion being wherein present in black liquor will precipitate.When reclaiming hardwood black liquor, it is being not desired to suppress Calcium compounds such as calcium carbonate
Fouling in the surface wanted such as container for evaporation plus heat transfer surface, it has been found that, will be with the Temperature Treatment more than 160 DEG C
Calcium ion in easy and very effective mode precipitating liquid so that where controllable precipitation occurs, and therefore prevents not
In desired fouling, such as heating surface in container for evaporation.
Hardwood for manufacturing paper pulp is preferably eucalyptus, i.e. therefore black liquor is eucalyptus black liquor.It has been found that eucalyptus black liquor
Comprising a large amount of free calcium ions, mainly due to low boiling temperature, but some Eucalyptus spps also include the calcium of a large amount.Therefore,
The problem of undesirable fouling, increases.By in the Temperature Treatment eucalyptus black liquor more than 160 DEG C, finding calcium ions precipitate and therefore
The position of controllable precipitation, and therefore prevent or even eliminate the fouling on undesirable surface.Hardwood is further preferred
For the timber based on plantation.
Temperature during processing is preferably 160-190 DEG C, more preferably higher than 165 DEG C and then be preferably 165-185
DEG C, even more preferably 170-180 DEG C.Too low temperature will not precipitated calcium in a satisfactory manner, and too high-temperature needs
Therefore many energy simultaneously do not have cost efficiency.
The processing preferably lasts for being less than 60 minutes, preferably shorter than 40 minutes.The time needed depends on what is handled
Black liquor and the temperature used.
Preferably, by the way that with heating medium, preferably steam (steam) or steam (vapor) directly contacts raising temperature
Degree.Either steam can be low pressure live steam, middle pressure live steam, high pressure live steam or be steamed from first suitable steam
The secondary steam in hair stage.
Processing is preferably carried out in preserving container (retention vessel), such as single container, evaporator vessel
Bottom, or the unitary part in container for evaporation.Using this arrangement, hot surface fouling in container for evaporation there will be no
It is dangerous.Heating medium can add before preserving container, such as added to the single condenser before preserving container, or
Person is injected to the pipeline before preserving container.Also heating medium can be added directly in preserving container.
Preferably, the 20-100% of the black liquor provided in the Temperature Treatment higher than 160 DEG C.According to the present invention in high-temperature process
Whole black liquor stream may not be necessary.In some cases, the black liquor for handling smaller portions is probably enough, and still is able to
Reduce fouling tendency.
The dry content (dry content) of the black liquor handled is preferably 30-45%.
The invention further relates to the hardwood black liquor handled according to the above method.By in the Temperature Treatment hardwood more than 160 DEG C
Black liquor, the calcium ion in liquid will precipitate and be formed calcium carbonate crystal.It has been shown that the viscosity of the hardwood black liquor through processing with to
Fixed dry content reduces, and it promotes further processing and processing.
Embodiment
During (for example, digestion of hardwood bits) recovery black liquor is manufactured from bardwood pulp, in the surface (example of returnable
Such as, the heating surface of container for evaporation) on the problem of undesirable fouling be present.When according to prior art (for example, less than 145
DEG C high temperature) processing hardwood black liquor when, calcium ions precipitate does not occur, i.e. calcium still for dissolving form.It is it has now been found that logical
Cross in higher temperature, i.e. in the temperature processing liquid higher than 160 DEG C, the calcium ion of precipitable hardwood black liquor.
Bardwood pulp is preferably hardwood sulfate pulp.It is also possible, however, to use other paper pulp, such as from non-sulfur pulping side
The paper pulp of method.
It may not be necessary to heat whole black liquor streams from bardwood pulp's pulping process.Only handle the one of black liquor
Part is probably enough, and still is able to reduce fouling tendency.Preferably, the 20- of the black liquor withdrawn from pulping process is handled
100%, more preferably 30-90%.In some cases, it is necessary in the whole liquid stream of Temperature Treatment more than 160 DEG C, i.e. 100%
Black liquor.
It has been shown that compared with not in the hardwood black liquor that the Temperature Treatment more than 160 DEG C is crossed, handled according to the inventive method
Hardwood black liquor will have the viscosity that reduces in given dry content.This is favourable, because promoting any subsequent treatment of liquid,
For example, pumping of liquid etc..Processing with highly viscous liquid is always more difficult, so always wanting to reduce viscosity.
Hardwood for manufacturing bardwood pulp is preferably eucalyptus.It has been shown that eucalyptus black liquor includes a large amount of calcium ions.
It was found that in order that free calcium ions precipitate, the temperature more than 160 DEG C is required.However, come from other hardwood species such as birch
Tree, class white poplar (aspen), the black liquor of the digestion of acacia or white poplar can also be handled according to the inventive method.
Temperature during processing is increased to above 160 DEG C.Preferably, temperature be 160-190 DEG C, more preferably higher than 165
DEG C and therefore preferably also 165-185 DEG C, more preferably 170-180 DEG C.Do not find to be less than 150 DEG C or the temperature at 150 DEG C
Degree can precipitate any free calcium ions in hardwood liquid in a satisfactory manner.Too high-temperature, for example, higher than 190 DEG C
Temperature it is also unfavorable, since it is desired that many energy heat liquid too much, and therefore do not have cost efficiency.Preferably, use
Steam either steam or the mixture of the two, to improve the temperature of liquid.Depending on the temperature of liquid before treatment and it is
Precipitation is intended to the temperature required for the calcium ion for the treatment of liquid, and the steam with different pressures can be used.If steamed using low pressure
Vapour is enough, then certain low-pressure steam is the selection of most energy efficiency, however, due to needs temperature relatively
Height, most probable need to use middle pressure or high steam.Suitable steam or steam can be fresh for low pressure live steam, middle pressure
Steam, high pressure live steam or the secondary steam from the first evaporation stage.
Preferably, the temperature of black liquor is reduced by being flashed in one or several steps after treatment.Flash distillation will production
Raw steam, the steam can reuse and thus minimize overall energy consumption.The another of black liquor temperature is reduced after treatment
One option is to pass through cooling.Cooling will produce warm water, and the warm water can for example be used for the factory (mill) of generating region heating.
Preferably, make processing time short as much as possible.It has been shown that the time less than 60 minutes be enough precipitating liquid be in
The calcium ion of calcium compound such as calcium carbonate form.Preferably, processing time is less than 40 minutes, preferably 5-30 minutes.Processing
Sustainable less than about 2 hours.
Preferably, handle and carried out in preserving container, for example, single container, evaporator vessel bottom, steaming
Send out in container individually partly or in the single condenser before preserving container.Preserving container does not include precipitation
Calcium can cause any heating surface of fouling above.Processing is generally in seven stages convection current vaporising device second or the 3rd
Carried out before effect.The purpose of the present invention is to ensure that the precipitation of calcium does not occur on the heating surface of such as container for evaporation, i.e. control
System is precipitated to prevent undesired fouling.
Calcium will be precipitated mainly as calcium carbonate.Once calcium ions precipitate, they are no longer result in any scale problems, and
And the calcium of precipitation will continue to be further processed in vaporising device together with liquid.
Select the dry content for the hardwood black liquor to be handled so that it is less high, because calcium carbonate will contain in higher dry solid
Amount precipitation.If dry content is increased to above the limit of precipitation of calcium carbonate, it can not possibly control where precipitation is carried out.With too
The processing of the hardwood black liquor of low dry content is economically disadvantageous, because it needs more energy warms liquid to the temperature needed.
Dry content according to the hardwood black liquor of the invention to be handled is that 30-45% can be preferable.
It is contemplated that depending on the different raw materials used in pulping process, be set forth above (and claim
1 reflection) deactivation method can be different, because the chemical composition of raw material can be different.Although the treatment temperature needed for black liquor must surpass
Design boiling temperature is crossed, but need not be too high and to negatively affect the energy balance of factory.According to the present invention, suitable liquid
Body temperature ranges are 160-190 DEG C as described above, and preferably 165-185 DEG C.In the experiment of following embodiment part,
Using eucalyptus as raw material, it is contemplated that with other hardwood for example, class white poplar, white poplar, acacia and birch can realize similar result.
The present invention includes implementation below：
1. the hardwood black liquor from bardwood pulp's manufacture is handled to precipitate the method for the calcium ion being present in the liquid,
Wherein it the described method comprises the following steps：
- the hardwood black liquor from bardwood pulp's manufacture is provided,
- at least a portion of liquid described in the Temperature Treatment higher than 160 DEG C, wherein the calcification being present in black liquor
Compound such as calcium carbonate will precipitate.
2. 1 method, wherein the hardwood is eucalyptus, class white poplar, white poplar, acacia either birch or combinations thereof.
3. any one of foregoing method, wherein the temperature during the processing is 160-190 DEG C, preferably 165-185
DEG C, most preferably 170-180 DEG C.
4. any one of foregoing method, wherein the processing continues for less than about 2 hours, preferably less than 60 minutes, most preferably
Less than 40 minutes, especially preferably 5-30 minutes.
5. any one of foregoing method, wherein the processing is carried out in preserving container.
6. any one of foregoing method, wherein by being preferably that steam or steam are directly contacted to improve with heating medium
The temperature.
7. any one of foregoing method, the 20-100% of the black liquor provided in it is in the Temperature Treatment higher than 160 DEG C.
8. the method for any one of preceding claims, wherein the dry content for the black liquor to be handled is 30-45%.
9. the hardwood black liquor handled according to any one of item 1-8 method.
The preferred feature of each aspect of the present invention is optionally suitably changed as described in for each other side.
Prior art literature described herein is combined in the case of allowed by law to greatest extent.Further retouch in the examples below
The present invention is stated, it does not limit the invention in any way scope.This hair is more fully described by means of the embodiment of embodiment
Bright embodiment, its sole purpose is to illustrate the present invention, and is not intended to limit the scope of the invention anyway.
Embodiment 1
By the black liquor vaporizing from eucalyptus sulfate salt boiling method to 34.5% dry solid content and at 140 DEG C, 170 DEG C and
180 DEG C of Temperature Treatment 30 minutes.
Table 1 below is shown in the measurement result of the solubility calcium in black liquor after the heat treatment according to the present invention.
Calcium content inductively coupled plasma optical emission spectroscopy method (inductively coupled plasma
Optical emission spectrometry, ICP-AES) measurement.
Table 1：Solubility calcium in the undressed black liquor as reference and in the black for the treatment of of different temperature 30 minutes
The comparison of solubility calcium in liquid.
As can be seen from Table 1, after 180 DEG C are handled 30 minutes, the amount of solubility calcium substantially reduces.As can also be seen from Table 1, exist
The amount of solubility calcium is uninfluenced after 140 DEG C of processing 30 minutes, and can reduce the amount of solubility calcium in 170 DEG C of processing.
Embodiment 2
By the black liquor vaporizing from eucalyptus sulfate salt boiling method to 34.5% dry solid content, and 180 DEG C handle 5,
10th, 20 and 30 minutes.
Table 2 below is shown in the measurement result of the solubility calcium in black liquor after present invention heat treatment.
Calcium content is measured with inductively coupled plasma optical emission spectroscopy method (ICP-AES).
Table 2：Solubility calcium in the undressed black liquor as reference and the black liquor in 180 DEG C of processing different times
In solubility calcium comparison.
| Solubility calcium content (mg/kg dry solids) | |
| Undressed black liquor (reference) | 960 |
| The black liquor of the processing 5 minutes at 180 DEG C | 700 |
| The black liquor of the processing 10 minutes at 180 DEG C | 660 |
| The black liquor of the processing 20 minutes at 180 DEG C | 440 |
| The black liquor of the processing 30 minutes at 180 DEG C | 460 |
As can be seen from Table 2, the amount of solubility calcium is reduced after 180 DEG C of processing.Effective processing time tends to after 20 minutes
Gently, i.e. this eucalyptus black liquor need not be handled more than 20 minutes.
Embodiment 3
Black liquor in embodiment 3 is based on eucalyptus, and wherein result is reflected in table 3 and 4.Table 3 is shown in 150 DEG C of heat treatment
Effect.The dramatic impact for the calcium that table 4 is dissolved during being shown in 2 hours in 180 DEG C of processing.
Table 3：Solubility calcium in the undressed black liquor as reference and the black liquor in 150 DEG C of processing different times
In solubility calcium comparison.
Table 4：In solubility calcium in the undressed black liquor as reference and the black liquor of the processing 2 hours at 180 DEG C
Solubility calcium comparison.
| Solubility calcium content (mg/kg dry solids) | |
| Undressed black liquor (with reference to 3) | 790 |
| The black liquor of the processing 2 hours at 180 DEG C | 50 |
Due to the detailed description above the present invention, other improvement and change will become to those skilled in the art
Obtain obviously.It should be apparent, however, that these other improvement and change can be implemented, but still without departing from the present invention
Spirit and scope.
Claims (7)
1. the hardwood black liquor from bardwood pulp's manufacture is handled to precipitate the method for the calcium ion being present in the liquid, wherein
It the described method comprises the following steps：
- the hardwood black liquor from bardwood pulp's manufacture is provided, wherein the dry content for the black liquor to be handled is 30-45%,
At least a portion of liquid described in the-Temperature Treatment at 165-185 DEG C, wherein the calcium compound being present in black liquor
As calcium carbonate will precipitate,
Wherein it is described processing carried out in preserving container, such as single container, in container for evaporation individually part or
In the single condenser before preserving container, the calcium that the preserving container does not include precipitation can cause fouling above
Any heating surface.
2. the method for claim 1 wherein the hardwood is eucalyptus, class white poplar, white poplar, acacia either birch or their group
Close.
3. the method for any one of preceding claims, wherein the temperature during the processing is 170-180 DEG C.
4. the method for any one of preceding claims, wherein the processing continues for less than about 2 hours, preferably less than 60 points
Clock, most preferably in less than 40 minutes, especially preferably 5-30 minutes.
5. the method for any one of preceding claims, wherein by being preferably that steam or steam directly connect with heating medium
Touch to improve the temperature.
6. the method for any one of preceding claims, the 20-100% of the black liquor provided in it is in the temperature higher than 160 DEG C
Degree processing.
7. the hardwood black liquor handled according to any one of claim 1-6 method.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1150800-9 | 2011-09-05 | ||
| SE1150800 | 2011-09-05 | ||
| CN201280043097.3A CN103842582A (en) | 2011-09-05 | 2012-08-28 | Process for treating hardwood black liquor and hardwood black liquor treated according to the process |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280043097.3A Division CN103842582A (en) | 2011-09-05 | 2012-08-28 | Process for treating hardwood black liquor and hardwood black liquor treated according to the process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107503213A true CN107503213A (en) | 2017-12-22 |
Family
ID=47832440
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710860022.9A Pending CN107503213A (en) | 2011-09-05 | 2012-08-28 | The hardwood black liquor for handling the method for hardwood black liquor and being handled according to this method |
| CN201280043097.3A Pending CN103842582A (en) | 2011-09-05 | 2012-08-28 | Process for treating hardwood black liquor and hardwood black liquor treated according to the process |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280043097.3A Pending CN103842582A (en) | 2011-09-05 | 2012-08-28 | Process for treating hardwood black liquor and hardwood black liquor treated according to the process |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2753750B1 (en) |
| CN (2) | CN107503213A (en) |
| BR (1) | BR112014005055B1 (en) |
| ES (1) | ES2729110T3 (en) |
| PT (1) | PT2753750T (en) |
| WO (1) | WO2013036190A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85106333A (en) * | 1985-08-19 | 1987-02-18 | 张沐恩 | The mill by coacervation and precipitation of alkali and lignin in the black liquid |
| EP0313730A1 (en) * | 1987-10-26 | 1989-05-03 | Kamyr, Inc. | Apparatus and methods for reducing the formation of scale in pulping operations |
| US6090240A (en) * | 1997-02-21 | 2000-07-18 | Ahlstrom Machinery Oy | Method of inhibiting scaling in black liquor evaporators |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2063177A (en) * | 1934-08-02 | 1936-12-08 | Ralph H Mckee | Recovery of organic constituents from black liquor |
| US3951753A (en) * | 1969-06-03 | 1976-04-20 | Roller Paul S | Method and apparatus for the conversion of an aqueous scale-formed liquid |
| IN154386B (en) * | 1979-12-10 | 1984-10-20 | Dorr Oliver Inc | |
| SE509444C2 (en) * | 1997-05-14 | 1999-01-25 | Mo Och Domsjoe Ab | Procedure for Minimizing Calcium Caused Incrustation Problems in Preparation of Bleached Cellulose Pulp |
| FI972954L (en) * | 1997-07-11 | 1999-01-12 | Sunds Defibrator Pori Oy | Method for treating waste liquor generated in the production of sulphate pulp |
| SE9803384L (en) * | 1998-03-02 | 1999-09-03 | Kemira Kemi Ab | Process for treating process water |
| FI981803L (en) | 1998-08-21 | 2000-02-22 | Ahlstrom Machinery Oy | Method for preventing the formation of precipitates |
| GB0325578D0 (en) * | 2003-11-03 | 2003-12-03 | Bioregional Minimills Uk Ltd | Method for treating black liquor |
| US7985318B2 (en) * | 2007-05-10 | 2011-07-26 | Nalco Company | Method of monitoring and inhibiting scale deposition in pulp mill evaporators and concentrators |
-
2012
- 2012-08-28 WO PCT/SE2012/050907 patent/WO2013036190A1/en active Application Filing
- 2012-08-28 PT PT12830388T patent/PT2753750T/en unknown
- 2012-08-28 CN CN201710860022.9A patent/CN107503213A/en active Pending
- 2012-08-28 CN CN201280043097.3A patent/CN103842582A/en active Pending
- 2012-08-28 BR BR112014005055-4A patent/BR112014005055B1/en active IP Right Grant
- 2012-08-28 EP EP12830388.0A patent/EP2753750B1/en active Active
- 2012-08-28 ES ES12830388T patent/ES2729110T3/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85106333A (en) * | 1985-08-19 | 1987-02-18 | 张沐恩 | The mill by coacervation and precipitation of alkali and lignin in the black liquid |
| EP0313730A1 (en) * | 1987-10-26 | 1989-05-03 | Kamyr, Inc. | Apparatus and methods for reducing the formation of scale in pulping operations |
| US6090240A (en) * | 1997-02-21 | 2000-07-18 | Ahlstrom Machinery Oy | Method of inhibiting scaling in black liquor evaporators |
Non-Patent Citations (1)
| Title |
|---|
| FREDERICK: "Preventing Calcium Carbonate Scaling In Black Liquor Evaporators", 《SOUTHERN PULP AND PAPER MANUFACTURER》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2753750A4 (en) | 2015-04-22 |
| EP2753750A1 (en) | 2014-07-16 |
| PT2753750T (en) | 2019-06-06 |
| BR112014005055A2 (en) | 2017-03-28 |
| EP2753750B1 (en) | 2019-03-06 |
| CN103842582A (en) | 2014-06-04 |
| BR112014005055B1 (en) | 2021-01-12 |
| WO2013036190A1 (en) | 2013-03-14 |
| ES2729110T3 (en) | 2019-10-30 |
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