CN111979828A - Online continuous defoaming treatment method for white water of papermaking system - Google Patents
Online continuous defoaming treatment method for white water of papermaking system Download PDFInfo
- Publication number
- CN111979828A CN111979828A CN202010905733.5A CN202010905733A CN111979828A CN 111979828 A CN111979828 A CN 111979828A CN 202010905733 A CN202010905733 A CN 202010905733A CN 111979828 A CN111979828 A CN 111979828A
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- Prior art keywords
- white water
- emulsion
- white
- parts
- defoaming agent
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 36
- 150000002191 fatty alcohols Chemical class 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 16
- 239000000839 emulsion Substances 0.000 claims description 58
- DCXXMTOCNZCJGO-UHFFFAOYSA-N tristearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(OC(=O)CCCCCCCCCCCCCCCCC)COC(=O)CCCCCCCCCCCCCCCCC DCXXMTOCNZCJGO-UHFFFAOYSA-N 0.000 claims description 16
- 239000012188 paraffin wax Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 239000000084 colloidal system Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000006229 carbon black Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 230000001804 emulsifying effect Effects 0.000 claims description 4
- 238000009775 high-speed stirring Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 229920000136 polysorbate Polymers 0.000 claims description 4
- 230000002209 hydrophobic effect Effects 0.000 claims description 3
- 239000002562 thickening agent Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000006260 foam Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 7
- 230000005764 inhibitory process Effects 0.000 abstract description 5
- 230000002045 lasting effect Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 2
- 239000013530 defoamer Substances 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- -1 fatty acid ester Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 208000002430 Multiple chemical sensitivity Diseases 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000003254 anti-foaming effect Effects 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
Landscapes
- Paper (AREA)
- Degasification And Air Bubble Elimination (AREA)
Abstract
The invention discloses an online continuous defoaming treatment method for white water in a papermaking system, and the obtained fatty alcohol defoaming agent contains fatty alcohol with different particle sizes and simultaneously adopts an overflow dosing mode, so that the defoaming agent has the advantages of good dispersibility, high defoaming speed and lasting foam inhibition effect.
Description
Technical Field
The invention belongs to the technical field of fine chemical engineering, and particularly relates to an online defoaming treatment technology for an emulsion type fatty alcohol defoaming agent.
Background
In the pulping and papermaking process, the production efficiency and the product quality are seriously influenced by the existence of foam. Therefore, defoaming and suds suppressors are a necessity for the pulping process. In most cases, the most effective way to control foam is to add chemical aids that prevent or eliminate foam formation, such as: low surface tension oils, hydrophobic particles, various antifoaming/suds suppressors. At present, the higher fatty alcohol defoamer is widely applied to all paper making sections due to the excellent performance of the defoamer. However, as environmental requirements increase, the white water circulation of papermaking systems becomes increasingly closed, resulting in the accumulation of large amounts of surface active substances, thereby forming foams that are more complex in structure and more difficult to break. Therefore, there is a need to develop higher performance defoamers to meet more complex requirements.
At present, the conventional defoaming agent is uniform emulsion particles, and the components are gradually complicated along with the accumulation of organic matters such as surfactants and the like in a closed-cycle papermaking white water system, and the defoaming effect is gradually weakened, so that the defoaming performance is required to be more stably and durably improved. In addition, the currently commonly used fatty alcohol defoaming agent is usually added directly according to the amount of white water, but because the defoaming agent, especially the emulsion type fatty alcohol defoaming agent, is sensitive to temperature and is easy to generate instability phenomenon to cause emulsion delamination and other problems when the temperature is too low or too high (lower than frost or higher than 40 ℃), the defoaming stability is further reduced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide an online continuous defoaming treatment method for white water in a papermaking system, the obtained fatty alcohol defoaming agent contains fatty alcohols with different particle sizes, and an overflow dosing mode is adopted, so that the defoaming agent has the advantages of good dispersibility, high defoaming speed and lasting foam inhibition effect.
In order to solve the technical problems, the invention adopts the following technical scheme: an on-line continuous defoaming treatment method for white water in a papermaking system comprises the following steps:
step 1: pumping and filtering white water of a papermaking system by a filter pump, and sending the white water into a buffer tank, wherein the temperature of the white water of the system in the buffer tank is controlled to be 20-35 ℃;
step 2: after the white water of the system reaches a set liquid level height, putting 0.01-0.02% by volume of defoaming agent through a chemical adding pipe inserted into a buffer tank;
and step 3: and continuously starting the filter pump to send the white water into the buffer pool, simultaneously continuously sending the defoaming agent into the bottom of the buffer pool through a chemical feeding pipe inserted below the liquid level of the buffer pool, enabling the white water in the buffer pool to enter an overflow groove in an overflow mode, pumping the white water out of the overflow groove through the filter pump again, and circularly sending the white water to the subsequent steps for treatment, wherein a silk screen cover is arranged at the outlet end of the chemical feeding pipe.
Preferably, the defoaming agent is an emulsion type fatty alcohol defoaming agent.
Further, the emulsion type fatty alcohol defoaming agent is prepared by the following method:
(1) heating oil phases of paraffin, N20+, 68# white oil, glycerol tristearate and Tween 85 to 75-85 ℃ for melting, adding hot water of 80-95 ℃ for high-speed stirring and emulsifying to form a coarse emulsion A;
(2) homogenizing the coarse emulsion A by a colloid mill to control the particle size of an oil phase in the coarse emulsion A to be 8-12 mu m;
(3) heating oil phases of paraffin, N20+, glycerol tristearate and white carbon black to 75-85 ℃ for melting, adding hot water of 80-95 ℃ for high-speed stirring and emulsifying to form a coarse emulsion B;
(4) homogenizing the coarse emulsion B obtained in the step (3) by a colloid mill to control the particle size of an oil phase in the coarse emulsion B to be 2.5-3.5 mu m;
(5) and (3) uniformly mixing the coarse emulsion A and the coarse emulsion B obtained in the steps (2) and (4), and adjusting the viscosity of the emulsion to 400 +/-10 cps by using a thickening agent to complete the process.
Further, the mass fractions of the components in the crude emulsion A are as follows: 6 parts of paraffin; n20+13 parts; 6 parts of 68# white oil; 3 parts of glycerol tristearate and 0.5 part of Tween 85; the mass fraction of each component in the coarse emulsion B is as follows: 6 parts of paraffin; n20+11 parts; 6 parts of 68# white oil; 3 parts of glycerol tristearate; and 2 parts of hydrophobic white carbon black.
Further, the defoaming agent added into the buffer tank is diluted to 1-10%.
Further, the volume percentage of the defoaming agent added to the white water fed in step 3 is 0.05 to 0.02%.
Has the advantages that: according to the invention, the higher-performance fatty alcohol defoaming agent is prepared by changing the production process and an overflow dosing mode is combined, so that the defoaming agent has good dispersibility, high defoaming speed and lasting foam inhibition effect.
Detailed Description
FIG. 1 is a graph showing a particle size distribution of a crude emulsion A in example 1 of the present invention;
FIG. 2 is a graph showing the particle size distribution of the crude emulsion B in example 1 of the present invention.
Detailed Description
The invention is further elucidated with reference to the drawings and the embodiments. It is to be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which may occur to those skilled in the art upon reading the present specification. Preparation of emulsion type higher fatty alcohol defoaming agent
1. Preparation of a crude emulsion A
1) Adding oil phase components such as paraffin, fatty alcohol, fatty acid ester and the like into a reaction kettle, heating to about 80 ℃, and preserving heat until the oil phase is completely melted.
2) Then 90-degree hot water is added, the stirring speed is controlled to be 500rpm, and the stirring is carried out until the emulsion is completely emulsified to form a coarse emulsion.
3) Setting the distance between colloid mills to be 0.5-0.8mm to homogenize the coarse emulsion, and controlling the median particle size of the coarse emulsion to be 8-12um and the distribution to be concentrated. Thus obtaining the crude emulsion A.
2. Preparation of a crude emulsion B
1) Oil phase components such as paraffin, fatty alcohol, fatty acid ester, white carbon black and the like are added into a reaction vessel, the temperature is raised to 80 ℃, and the temperature is raised until the oil phase is completely melted.
2) Then adding hot water with the temperature of 90 ℃, controlling the stirring speed to be 500rpm, and stirring until the emulsion is completely emulsified to form coarse emulsion.
3) Setting the distance between colloid mills to be 0.0-0.1mm to homogenize the coarse emulsion, and controlling the median particle size of the coarse emulsion to be 3um with centralized distribution. Thus obtaining the coarse emulsion B.
Wherein, the crude emulsion A and the crude emulsion B are compounded according to the following table 1 to obtain:
table 1: the ratio of the crude emulsion A to the crude emulsion B
3. Composite proportion of coarse emulsion A and coarse emulsion B
1) The coarse emulsion A and the coarse emulsion B are stirred and mixed at high temperature according to the proportion that the coarse emulsion A accounts for 10-50% of the whole body, and the specific proportioning mode is detailed in table 2.
2) Cooling the mixture, adding thickener to regulate the viscosity of the emulsion to about 400cps, and adding bactericide. The target defoaming agent is obtained.
The defoaming agent is used for defoaming treatment of white water in a papermaking system: firstly, white water of a papermaking system is pumped and filtered by a filter pump and sent into a buffer tank, and the temperature of the white water of the system in the buffer tank is controlled to be 20-35 ℃; after the white water of the system reaches a set liquid level height, putting the defoaming agent with the volume percentage of 0.01-0.02% through a chemical adding pipe inserted into a buffer tank; and continuously starting the filter pump to send the white water into the buffer pool, simultaneously continuously sending the defoaming agent into the bottom of the buffer pool through a chemical feeding pipe inserted below the liquid level of the buffer pool, enabling the white water in the buffer pool to enter an overflow groove in an overflow mode, pumping the white water out of the overflow groove through the filter pump again, and circularly sending the white water to the subsequent steps for treatment, wherein a silk screen cover is arranged at the outlet end of the chemical feeding pipe.
Comparative example 1: the fatty alcohol antifoaming agent sample with the grain diameter of about 5 mu m is prepared by the traditional preparation method. Comparative example 2: certain brands of fatty alcohol antifoam are commercially available. Finally, by comparing the defoaming agent column-shaped defoaming/foam inhibition test data (foam height in ml), it can be seen that
Table 3: comparison of defoaming/foam suppressing data for defoamers of examples and comparative examples (foam height in ml)
As shown in Table 3, compared with the comparative example, the defoaming agent has better dispersibility, higher defoaming speed and longer foam inhibition effect.
According to the invention, by designing the coarse emulsions A and B composed of different particle sizes, the particle sizes in the coarse emulsion A are normally distributed and concentrated in a larger particle size range of 9-10 micrometers, and the papermaking white water surfactant is defoamed mainly in a bridging-spreading mode in a defoaming process; the particle size of the coarse emulsion B is normally and intensively distributed in a range of 3 mu m, and at the moment, the defoaming agent is locally contacted with the foam liquid film to reduce the surface tension of the foam liquid film and form a surface tension difference, so that the liquid film is broken to achieve a defoaming effect. Therefore, the defoaming agent of the present application has a significant advantage in defoaming volume-suppressing effect as compared with the comparative examples.
Claims (6)
1. An on-line continuous defoaming treatment method for white water in a papermaking system is characterized by comprising the following steps:
step 1: pumping and filtering white water of a papermaking system by a filter pump, and sending the white water into a buffer tank, wherein the temperature of the white water of the system in the buffer tank is controlled to be 20-35 ℃;
step 2: after the white water of the system reaches a set liquid level height, putting 0.01-0.02% by volume of defoaming agent through a chemical adding pipe inserted into a buffer tank;
and step 3: and continuously starting the filter pump to send the white water into the buffer pool, simultaneously continuously sending the defoaming agent into the bottom of the buffer pool through a chemical feeding pipe inserted below the liquid level of the buffer pool, enabling the white water in the buffer pool to enter an overflow groove in an overflow mode, pumping the white water out of the overflow groove through the filter pump again, and circularly sending the white water to the subsequent steps for treatment, wherein a silk screen cover is arranged at the outlet end of the chemical feeding pipe.
2. The on-line continuous defoaming treatment method for white water in a papermaking system according to claim 1, characterized in that: the defoaming agent is an emulsion type fatty alcohol defoaming agent.
3. The on-line continuous defoaming treatment method for white water in a papermaking system according to claim 2, characterized in that: the emulsion type fatty alcohol defoaming agent is prepared by the following method:
(1) heating oil phases of paraffin, N20+, 68# white oil, glycerol tristearate and Tween 85 to 75-85 ℃ for melting, adding hot water of 80-95 ℃ for high-speed stirring and emulsifying to form a coarse emulsion A;
(2) homogenizing the coarse emulsion A by a colloid mill to control the particle size of an oil phase in the coarse emulsion A to be 8-12 mu m;
(3) heating oil phases of paraffin, N20+, glycerol tristearate and white carbon black to 75-85 ℃ for melting, adding hot water of 80-95 ℃ for high-speed stirring and emulsifying to form a coarse emulsion B;
(4) homogenizing the coarse emulsion B obtained in the step (3) by a colloid mill to control the particle size of an oil phase in the coarse emulsion B to be 2.5-3.5 mu m;
(5) and (3) uniformly mixing the coarse emulsion A and the coarse emulsion B obtained in the steps (2) and (4), and adjusting the viscosity of the emulsion to 400 +/-10 cps by using a thickening agent to complete the process.
4. The on-line continuous defoaming treatment method for white water in a papermaking system according to claim 3, characterized in that: the mass fraction of each component in the crude emulsion A is as follows: 6 parts of paraffin; n20+13 parts; 6 parts of 68# white oil; 3 parts of glycerol tristearate and 0.5 part of Tween 85; the mass fraction of each component in the coarse emulsion B is as follows: 6 parts of paraffin; n20+11 parts; 6 parts of 68# white oil; 3 parts of glycerol tristearate; and 2 parts of hydrophobic white carbon black.
5. The on-line continuous defoaming treatment method for white water in a papermaking system according to claim 3, characterized in that: and the defoaming agent added into the buffer pool is diluted to 1-10%.
6. The on-line continuous defoaming treatment method for white water in a papermaking system according to claim 3, characterized in that: the volume percentage of the defoaming agent added in the step 3 relative to the fed white water is 0.05-0.02%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010905733.5A CN111979828B (en) | 2020-09-01 | 2020-09-01 | Online continuous defoaming treatment method for white water of papermaking system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010905733.5A CN111979828B (en) | 2020-09-01 | 2020-09-01 | Online continuous defoaming treatment method for white water of papermaking system |
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| Publication Number | Publication Date |
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| CN111979828A true CN111979828A (en) | 2020-11-24 |
| CN111979828B CN111979828B (en) | 2022-04-22 |
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|---|---|---|---|---|
| JP2005133240A (en) * | 2003-10-30 | 2005-05-26 | Daio Paper Corp | Method for controlling dissolved gas amount in white water for papermaking machine |
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| CN101845770A (en) * | 2009-12-17 | 2010-09-29 | 西安三业精细化工有限责任公司 | Emulsion antifoaming agent for making paper and preparation method thereof |
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| CN107059474A (en) * | 2017-05-25 | 2017-08-18 | 济宁南天农科化工有限公司 | A kind of high-grade fatty alcohol emulsion defoamer |
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-
2020
- 2020-09-01 CN CN202010905733.5A patent/CN111979828B/en active Active
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| JP2005133240A (en) * | 2003-10-30 | 2005-05-26 | Daio Paper Corp | Method for controlling dissolved gas amount in white water for papermaking machine |
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Effective date of registration: 20240411 Address after: 272200 north of Railway South Road, Jining Chemical Industry Economic and Technological Development Zone, Jinxiang County, Jining City, Shandong Province Patentee after: JINING NANTIANNONGKE CHEMICAL CO.,LTD. Country or region after: China Address before: 210000 room 121, Building 29, No.9 Weidi Road, Xianlin street, Qixia District, Nanjing City, Jiangsu Province Patentee before: Nanjing Dingzhao new material technology research and Development Co.,Ltd. Country or region before: China |
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