CN112778790A - Processing system and method for improving dissolving performance of fluorescent brightener CBS particles - Google Patents
Processing system and method for improving dissolving performance of fluorescent brightener CBS particles Download PDFInfo
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- CN112778790A CN112778790A CN202110001354.8A CN202110001354A CN112778790A CN 112778790 A CN112778790 A CN 112778790A CN 202110001354 A CN202110001354 A CN 202110001354A CN 112778790 A CN112778790 A CN 112778790A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B23/00—Methine or polymethine dyes, e.g. cyanine dyes
- C09B23/14—Styryl dyes
- C09B23/148—Stilbene dyes containing the moiety -C6H5-CH=CH-C6H5
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
- C09B67/0071—Process features in the making of dyestuff preparations; Dehydrating agents; Dispersing agents; Dustfree compositions
- C09B67/0092—Dyes in solid form
- C09B67/0094—Treatment of powders, e.g. antidusting
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
- C09B67/0071—Process features in the making of dyestuff preparations; Dehydrating agents; Dispersing agents; Dustfree compositions
- C09B67/0092—Dyes in solid form
- C09B67/0095—Process features in the making of granulates
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/40—Dyes ; Pigments
- C11D3/42—Brightening agents ; Blueing agents
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- Detergent Compositions (AREA)
Abstract
The invention relates to a treatment system and a treatment method for improving the solubility of fluorescent brightener CBS particles, and aims to solve the technical problems of slow dissolution speed and poor solution clarity of the existing fluorescent brightener CBS particles. The treatment system comprises a stainless steel pulping pot, a storage tank, a filter, a high-pressure screw pump, a pressure stabilizing tank, a distributor, a pressure spray granulation tower, a three-stage vibrating screen, a cyclone separator, a bag-type dust collector, an induced draft fan, waste gas treatment equipment, a recoverer, an air pump, an air filter, an air blower, a heater, an automatic material receiving device, a first conveying fan and a second conveying fan; the invention improves various process parameters in pulping, slurry conveying and spray granulationAnd (3) preparing hollow fluorescent brightener CBS particles, wherein the fluorescent brightener CBS particles are dissolved in water quickly, and the solution is clear and transparent. The ultraviolet absorption range of the finished product is 1140 +/-20, the particle size is 200 +/-10 mu m, and the bulk density is 500 +/-10 kg/m3And the method is more suitable for the parameter requirements of the fluorescent whitening agent in the market.
Description
Technical Field
The invention belongs to the technical field of fluorescent whitening agents, and particularly relates to a processing system and method for improving the solubility of fluorescent whitening agent CBS particles.
Background
The fluorescent whitening agent is an organic compound which utilizes the principle of optical complementary color and improves the whiteness and the gloss of substances, and is mainly used in the industries of textile, papermaking, plastics, synthetic detergents and the like. The fluorescent whitening agent 4, 4' -bis- (2-sodium sulfonate styryl) biphenyl (hereinafter referred to as fluorescent whitening agent CBS) belongs to a fluorescent whitening agent with a distyryl biphenyl structure, has good whitening effect on laundry powder, cotton fabric, protein fiber, acetate fiber and the like due to good water solubility, is widely applied to the washing product industry, the printing and dyeing industry and the like, and is a high-grade fluorescent whitening agent with excellent chlorine bleaching resistance, acid and alkali resistance and sun-proof performance.
At present, the production of the fluorescent brightener CBS mostly adopts the following process route at home and abroad:
(1) condensation reaction: taking 4, 4' -dimethylene diphosphodiethyl biphenyl (abbreviation: BPMB), sodium o-sulfonate benzaldehyde and methanol-sodium methoxide solution as raw materials, and taking N, N-Dimethylformamide (DMF) as a reaction medium to carry out Witting-Horner condensation reaction.
(2) And (3) distillation: distilling the condensation reaction mother liquor, and recovering methanol and DMF.
(3) Salting out: and (3) supplementing water into the distillation concentrated solution, heating to fully dissolve the distillation concentrated solution, adding salt, cooling to separate out a product, and performing filter pressing to obtain a CBS coarse filter cake and simultaneously generate CBS production wastewater.
(4) Refining: and adding water into the CBS coarse filter cake, mixing, pulping, heating to dissolve, thermally filtering to remove insoluble substances, cooling feed liquid, and press-filtering to obtain a CBS refined filter cake, wherein refined mother liquor is reused as water for a salting-out working section.
(5) And (3) drying: and drying the CBS refined filter cake to obtain a semi-finished product.
(6) Blending and granulating: adding anhydrous sodium sulphate according to different extinction coefficients of customers, blending to obtain a finished product, and granulating by a circulating fluidized bed to obtain granules.
The reaction principle is as follows:
the fluorescent whitening agent CBS granules are less dusty than powdered CBS and are more appreciated by detergent customers. However, the common spray drying mode of the fluorescent brightener CBS particles in the industry is to granulate by a circulating fluidized bed, the produced fluorescent brightener CBS particles are solid particles, the dissolution speed in normal-temperature water is low, the dissolution is finished in about 2 minutes on average, and the dissolution is slightly turbid, so that the use effect of detergent customers is influenced. Globally important washing customers such as American Baojie, IndoneWings and the like put forward the requirement of improving the solubility of fluorescent brightener CBS particles, wherein the dissolution speed is high, and the dissolution is clear and transparent after dissolution.
Disclosure of Invention
The invention aims to solve the technical problems of slow dissolving speed and poor clarity of a solution of the existing fluorescent brightener CBS particles, and provides a treatment system and a treatment method for improving the dissolving performance of the fluorescent brightener CBS particles.
In order to solve the technical problems, the invention adopts the technical scheme that:
the invention relates to a processing system for improving the solubility of fluorescent brightener CBS particles, which comprises a stainless steel pulping pot, a storage tank, a filter, a high-pressure screw pump, a pressure stabilizing tank, a distributor, a pressure spray granulation tower, a three-stage vibrating screen, a cyclone separator, a bag-type dust collector, an induced draft fan, waste gas treatment equipment, a recoverer, an air pump, an air filter, a blower, a heater, an automatic material receiving device, a first conveying fan and a second conveying fan;
the stainless steel pulping pot is sequentially connected with a storage tank, a filter, a high-pressure screw pump, a surge tank and a distributor through a slurry conveying pipeline, the distributor is arranged at the upper part of a pressure spray granulation tower, a discharge port at the lower end of the spray granulation tower is connected with a feed port of a third-stage vibrating screen through a discharge valve, and a discharge port of the third-stage vibrating screen is connected with an automatic material receiving device through a first conveying fan; a discharge port on one side of the lower part of the spray granulation tower is sequentially connected with a cyclone separator, a bag-type dust collector and an air inlet of an induced draft fan, and an air outlet of the induced draft fan is connected with waste gas treatment equipment; a discharge port at the lower end of the cyclone separator is connected with a feed port of the recoverer through a discharge valve, the recovered material is pumped into the top of the spray granulation tower again through an air pump, and a discharge port at the lower end of the bag-type dust remover is connected with a feed port of the automatic material receiving device through a second conveying fan; the air outlet of the air filter is connected with the air inlet of the air blower, the air outlet of the air blower is provided with a heater, and heated air is input to the upper part of the spray granulation tower through a pipeline.
Further, the volume of the stainless steel pulping pot is 10m3And is provided with a motor matched reducer and a paddle type stirrer with 11 kw.
Further, the pressure spray granulation tower was 5m in diameter and 40m high.
Further, the rated power of the high-pressure screw pump motor is 11kw, and the outlet pressure is 3.2 MPA.
Further, the filter area of the cloth bag dust remover is 400 square meters.
Further, the rated power of the blower motor is 55kw, and the rated power of the induced draft fan motor is 90 kw.
The invention also provides a treatment method for improving the solubility of the fluorescent brightener CBS particles, which comprises the following steps:
1) preparing a CBS refined filter cake: taking 4, 4' -dimethylene diphosphodiethyl biphenyl, sodium o-sulfonate benzaldehyde and methanol-sodium methoxide solution triethyl phosphite as raw materials, taking N, N-dimethylformamide as a reaction medium and sodium methoxide as a catalyst, carrying out Witting-Horner condensation reaction to prepare a fluorescent brightener CBS, and carrying out post-treatment and refining on a reaction product to obtain a CBS refined filter cake;
2) pulping the slurry: and (3) mixing the CBS refined filter cake, water and sodium chloride according to the weight ratio of 15: 13: 1, adding the mixture into a stainless steel pulping pot to pulp the pulp, wherein the solid content of the pulp is kept at 40%, a stirrer configured in the stainless steel pulping pot is a blade stirrer, and the stirring speed during pulping is 60 r/min;
3) slurry conveying and spray granulation: the pulped slurry enters a storage tank for storage, then enters a high-pressure screw pump after being filtered by a filter, is sequentially transported to a pressure stabilizing tank and a distributor through the high-pressure screw pump, improves the height and the pressure of the transported slurry, and then enters a pressure spray granulation tower for spray granulation to prepare hollow fluorescent brightener CBS particles;
4) the granulated fluorescent brightener CBS particles are dedusted by a bag-type dust remover with a square meter of 400 and sieved by a three-stage vibrating screen to obtain the product with the bulk density of 500 +/-10 kg/m3The particle size is 200 +/-10 mu m; the screened materials are sent into an automatic material receiving device through a first conveying fan so as to enter an automatic packaging production line; and conveying part of the materials dedusted by the bag-type dust remover to the automatic material receiving device through a second conveying fan so as to enter an automatic packaging production line.
Further, the slurry conveying pipeline is subjected to heat preservation treatment in the slurry conveying process, so that pipeline blockage caused in the conveying process after solid content is improved is prevented.
The invention has the advantages that:
1. the fluorescent brightener CBS particles prepared by the invention are hollow particles, are convenient to dissolve in water, have high dissolving speed, can be completely dissolved within 30s, and are clear and transparent.
2. In the treatment method, the fluorescent brightener CBS filter cake is directly added with sodium chloride and water for pulping and granulation, so that the granulation blending working procedures are reduced, and the process flow is simplified.
3. The ultraviolet absorption range of the fluorescent brightener CBS particles prepared by the invention is controlled to be 1140 +/-20, the particle size is 200 +/-10 mu m, and the bulk density is 500 +/-10 kg/m3And the method is more suitable for the parameter requirements of the fluorescent whitening agent in the market.
4. The treatment system and the method can effectively relieve the process and energy consumption, and the production cost per ton is reduced by about 1000 yuan.
Drawings
FIG. 1 is a schematic diagram of the structure of a treatment system according to the invention for improving the solubility of the fluorescent whitening agent CBS particles;
FIG. 2 is a diagram of a dissolution experiment of fluorescent brightener CBS particles treated by a circulating fluidized bed granulation method;
fig. 3 is a graph showing the dissolution test of the fluorescent whitening agent CBS particles after treatment by the treatment method of the present invention.
In the figure: the system comprises a stainless steel pulping pot 1, a storage tank 2, a filter 3, a high-pressure screw pump 4, a pressure stabilizing tank 5, a distributor 6, a pressure spray granulation tower 7, a vibrating screen 8, a cyclone separator 9, a bag-type dust collector 10, an induced draft fan 11, waste gas treatment equipment 12, a recoverer 13, an air pump 13, an air filter 15, an air blower 16, a heater 17, an automatic material receiving device 18, a first conveying fan 19 and a second conveying fan 20.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1, the treatment system for improving the solubility of fluorescent brightener CBS particles in this embodiment includes a stainless steel pulping pot 1, a storage tank 2, a filter 3, a high-pressure screw pump 4, a surge tank 5, a distributor 6, a pressure spray granulation tower 7, a three-stage vibrating screen 8, a cyclone separator 9, a bag-type dust collector 10, an induced draft fan 11, a waste gas treatment device 12, a recoverer 13, an air pump 14, an air filter 15, an air blower 16, a heater 17, an automatic material receiving device 18, a first conveying fan 19, and a second conveying fan 20;
the stainless steel pulping pot 1 is sequentially connected with a storage tank 2, a filter 3, a high-pressure screw pump 4, a pressure stabilizing tank 5 and a distributor 6 through a slurry conveying pipeline, and the volume of the stainless steel pulping pot 1 is 10m3And is provided with a motor matched reducer and a paddle type stirrer with 11 kw. The volume of the storage tank 2 is 10m3The rated power of the motor of the high-pressure screw pump 4 is 11kw, and the outlet pressure is 3.2 MPA.
The distributor 6 is arranged at the upper part of a pressure spray granulation tower 7, and the diameter of the pressure spray granulation tower 7 is 5m, and the height of the pressure spray granulation tower 7 is 40 m. A discharge port at the lower end of the spray granulation tower 7 is connected with a feed port of a third-stage vibrating screen 8 through a discharge valve, and a discharge port of the third-stage vibrating screen 8 is connected with an automatic material receiving device 18 through a first conveying fan 19; the discharge gate of 7 lower parts one side of spray granulation tower is connected with cyclone 9, sack cleaner 10 and draught fan 11's air intake in proper order, the air outlet and the exhaust-gas treatment equipment 12 of draught fan 11 are connected, the filter area of sack cleaner 10 is 400 square meters, the rated power of draught fan 11 motor is 90 kw.
A discharge hole at the lower end of the cyclone separator 9 is connected with a feed inlet of a recoverer 13 through a discharge valve, the recovered material is pumped into the top of the spray granulation tower 7 again through an air pump 14, and a discharge hole at the lower end of the bag-type dust remover 10 is connected with a feed inlet of an automatic material receiving device 18 through a second conveying fan 20; the air outlet of the air filter 15 is connected with the air inlet of the air blower 16, the air outlet of the air blower 16 is provided with a heater 17, and heated air is input to the upper part of the spray granulation tower 7 through a pipeline. The rated power of the motor of the blower 16 is 55 kw.
The treatment method for improving the solubility of the fluorescent brightener CBS particles by adopting the treatment system comprises the following steps:
1) preparing a CBS refined filter cake: taking 4, 4' -dimethylene diphosphodiethyl biphenyl, sodium o-sulfonate benzaldehyde and methanol-sodium methoxide solution triethyl phosphite as raw materials, taking N, N-dimethylformamide as a reaction medium and sodium methoxide as a catalyst, carrying out Witting-Horner condensation reaction to prepare a fluorescent brightener CBS, and carrying out post-treatment and refining on a reaction product to obtain a CBS refined filter cake;
2) pulping the slurry: and (3) mixing the CBS refined filter cake, water and sodium chloride according to the weight ratio of 15: 13: 1, adding the mixture into a stainless steel pulping pot 1 to pulp the pulp, wherein the solid content of the pulp is kept at 40%, a stirrer configured in the stainless steel pulping pot 1 is a paddle stirrer, and the stirring speed during pulping is 60 r/min;
3) slurry conveying and spray granulation: the pulped pulp enters a storage tank 2 for storage, then enters a high-pressure screw pump 4 after being filtered by a filter 3, is sequentially transported to a pressure stabilizing tank 5 and a distributor 6 through the high-pressure screw pump 4, improves the height and the pressure of the transported pulp, and then enters a pressure spray granulation tower 7 for spray granulation to prepare hollow fluorescent brightener CBS particles;
4) the granulated fluorescent brightener CBS particles are dedusted by a bag-type dust remover 10 with the square meter of 400 and are dedusted by threeSieving with a grade vibrating screen 8 to obtain the product with the bulk density of 500 +/-10 kg/m3The particle size is 200 +/-10 mu m; the screened materials are sent into an automatic material receiving device 18 through a first conveying fan 19 so as to enter an automatic packaging production line; and part of the materials dedusted by the bag-type dust collector 10 are conveyed to an automatic material receiving device 18 through a second conveying fan 19 so as to enter an automatic packaging production line.
The slurry conveying pipeline is subjected to heat preservation treatment in the slurry conveying process, so that pipeline blockage caused by conveying after solid content is improved is prevented.
Meanwhile, the fluorescent brightener CBS particles are treated in a circulating fluidized bed granulation mode to be used as a control group.
The fluorescent brightener CBS particles treated by two different granulation modes are subjected to dissolution speed and transmittance test experiments, and the experimental data are shown in the following table 1:
TABLE 1 dissolution rate and transmittance test experiment of CBS particles treated by different granulation methods
As can be seen from Table 1, the dissolution rate of the fluorescent brightener CBS particles treated by the method of the invention in normal temperature water is greatly reduced compared with the conventional circulating fluidized bed granulation, the dissolution rate efficiency is improved by 75% within 30 seconds from about 2 minutes before the dissolution, and the dissolved materials are clear and transparent.
As shown in fig. 2, it is a dissolution experimental diagram of the fluorescent brightener CBS particles treated by the circulating fluidized bed granulation method, and it can be seen that the fluorescent brightener CBS particles have slow dissolution speed, are turbid after dissolution, and have a general effect when applied to laundry detergent.
As shown in fig. 3, it is a dissolution experimental chart of the fluorescent brightener CBS particles treated by the treatment method of the present invention, and it can be seen that the fluorescent brightener CBS particles have the advantages of fast dissolution speed, clarity and transparency after dissolution, and good effect when applied to laundry detergent.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical solutions of the present invention in any way. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention fall within the scope of the present invention.
Claims (8)
1. A treatment system for improving the solubility of fluorescent whitening agent CBS particles, characterized in that: the device comprises a stainless steel pulping pot (1), a storage tank (2), a filter (3), a high-pressure screw pump (4), a pressure stabilizing tank (5), a distributor (6), a pressure spray granulation tower (7), a three-stage vibrating screen (8), a cyclone separator (9), a bag-type dust collector (10), an induced draft fan (11), waste gas treatment equipment (12), a recoverer (13), an air pump (14), an air filter (15), an air blower (16), a heater (17), an automatic material receiving device (18), a first conveying fan (19) and a second conveying fan (20);
the stainless steel pulping pot (1) is sequentially connected with a storage tank (2), a filter (3), a high-pressure screw pump (4), a pressure stabilizing tank (5) and a distributor (6) through a slurry conveying pipeline, the distributor (6) is arranged at the upper part of a pressure spray granulation tower (7), a discharge hole at the lower end of the spray granulation tower (7) is connected with a feed inlet of a three-stage vibrating screen (8) through a discharge valve, and a discharge hole of the three-stage vibrating screen (8) is connected with an automatic material receiving device (18) through a first conveying fan (19); a discharge hole on one side of the lower part of the spray granulation tower (7) is sequentially connected with a cyclone separator (9), a bag-type dust collector (10) and an air inlet of an induced draft fan (11), and an air outlet of the induced draft fan (11) is connected with waste gas treatment equipment (12); a discharge hole at the lower end of the cyclone separator (9) is connected with a feed hole of a recoverer (13) through a discharge valve, the recovered material is pumped into the top of the spray granulation tower (7) again through an air pump (14), and a discharge hole at the lower end of the bag-type dust collector (10) is connected with a feed hole of an automatic material receiving device (18) through a second conveying fan (20); the air outlet of the air filter (15) is connected with the air inlet of the air blower (16), the air outlet of the air blower (16) is provided with a heater (17), and heated air is input to the upper part of the spray granulation tower (7) through a pipeline.
2. A treatment system for improving the solubility of the CBS granules of optical brighteners as defined in claim 1, characterized in that: the stainless steel pulping pot(1) Has a volume of 10m3And is provided with a motor matched reducer and a paddle type stirrer with 11 kw.
3. A treatment system for improving the solubility of the CBS granules of optical brighteners as defined in claim 1, characterized in that: the diameter of the pressure spray granulation tower (7) is 5m, and the height of the pressure spray granulation tower is 40 m.
4. A treatment system for improving the solubility of the CBS granules of optical brighteners as defined in claim 1, characterized in that: the rated power of the motor of the high-pressure screw pump (4) is 11kw, and the outlet pressure is 3.2 MPA.
5. A treatment system for improving the solubility of the CBS granules of optical brighteners as defined in claim 1, characterized in that: the filtering area of the cloth bag dust remover (10) is 400 square meters.
6. A treatment system for improving the solubility of the CBS granules of optical brighteners as defined in claim 1, characterized in that: the rated power of the motor of the air blower (16) is 55kw, and the rated power of the motor of the induced draft fan (11) is 90 kw.
7. Treatment process for improving the solubility of fluorescent whitening agent CBS granules using the treatment system according to any of claims 1 to 6, characterized in that it comprises the following steps:
1) preparing a CBS refined filter cake: taking 4, 4' -dimethylene diphosphodiethyl biphenyl, sodium o-sulfonate benzaldehyde and methanol-sodium methoxide solution triethyl phosphite as raw materials, taking N, N-dimethylformamide as a reaction medium and sodium methoxide as a catalyst, carrying out Witting-Horner condensation reaction to prepare a fluorescent brightener CBS, and carrying out post-treatment and refining on a reaction product to obtain a CBS refined filter cake;
2) pulping the slurry: and (3) mixing the CBS refined filter cake, water and sodium chloride according to the weight ratio of 15: 13: 1, adding the mixture into a stainless steel pulping pot (1) to carry out pulping on the pulp, wherein the solid content of the pulp is kept at 40%, a stirrer configured in the stainless steel pulping pot (1) is a paddle stirrer, and the stirring speed during pulping is 60 r/min;
3) slurry conveying and spray granulation: the pulped pulp enters a storage tank (2) for storage, then enters a high-pressure screw pump (4) after being filtered by a filter (3), is sequentially transported to a pressure stabilizing tank (5) and a distributor (6) through the high-pressure screw pump (4), improves the height and pressure of the transported pulp, and then enters a pressure spray granulation tower (7) for spray granulation to prepare hollow fluorescent brightener CBS particles;
4) the granulated fluorescent brightener CBS particles are dedusted by a bag-type deduster (10) for 400 square meters and sieved by a three-stage vibrating screen (8), and the obtained product has the bulk density of 500 +/-10 kg/m3The particle size is 200 +/-10 mu m; the screened materials are sent into an automatic material receiving device (18) through a first conveying fan (19) to enter an automatic packaging production line; and partial materials dedusted by the bag-type dust remover (10) are conveyed to the automatic material receiving device (18) through the second conveying fan (19) to enter an automatic packaging production line.
8. The treatment process for improving the solubility of the fluorescent whitening agent CBS particles according to claim 7, characterized in that: the slurry conveying pipeline is subjected to heat preservation treatment in the slurry conveying process, so that pipeline blockage caused by conveying after solid content is improved is prevented.
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