CN111499026A - Recovery device and treatment method of dilute acrylic emulsion - Google Patents
Recovery device and treatment method of dilute acrylic emulsion Download PDFInfo
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- CN111499026A CN111499026A CN202010479252.2A CN202010479252A CN111499026A CN 111499026 A CN111499026 A CN 111499026A CN 202010479252 A CN202010479252 A CN 202010479252A CN 111499026 A CN111499026 A CN 111499026A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention provides a recovery device and a treatment method of dilute acrylic emulsion, wherein the recovery device mainly comprises: the circulating concentration tank is connected with a feeding pump, the feeding pump is connected with a circulating pump through a pipeline in front of the pump, and the circulating pump is connected with the tubular inorganic ultrafiltration membrane through a feeding pipeline; a concentrated solution outlet of the tubular inorganic ultrafiltration membrane is connected with a first circulating pipeline, and a circulating loop is formed by the first circulating pipeline, a second circulating pipeline, a pre-pump pipeline, a circulating pump and a feeding pipeline; a concentrated solution pipeline is arranged on the first circulating pipeline or the second circulating pipeline and is connected with a circulating concentration tank; the filtrate outlet of the tubular inorganic ultrafiltration membrane is connected with a filtrate storage tank; the circulating concentration tank is also connected with a discharge pump, and the discharge pump is connected with a concentrated liquid tank. The invention simplifies the operation condition of the ultrafiltration membrane, enlarges the operation pressure and temperature range, improves the pollution resistance of the ultrafiltration membrane, is convenient to clean on line and strong in recovery capability, and prolongs the service life of the ultrafiltration membrane.
Description
Technical Field
The invention belongs to the technical field of waste liquid treatment and recovery, and particularly relates to a recovery device and a treatment method for dilute acrylic emulsion.
Background
The acrylic emulsion is a polymer emulsion with a tiny particle size, has excellent gloss and transparency and good anti-blocking performance, is widely applied to various core industries such as advertising industry, building industry, traffic industry, IT industry and the like, and is an important chemical raw material closely related to national economy.
In the production process of the acrylic emulsion, stainless steel equipment and pipelines are regularly cleaned to generate a large amount of dilute acrylic emulsion, the solid content of acrylic acid is about 0.5-2%, the particle size is more than 100nm, and the contribution COD is 15000 mg/l. At present, the dilute acrylic emulsion is mainly subjected to coagulation sedimentation by adding a large amount of coagulant, the supernatant of the sedimentation is mixed with other wastewater of a factory for biochemical treatment and standard discharge, and a large amount of sludge generated by sedimentation is treated as hazardous waste after dehydration. For example, in a factory for producing propylene emulsion in a certain foreign enterprise at home, 6000ppm of polyferric sulfate is added into dilute acrylic emulsion for coagulating sedimentation, the COD (chemical oxygen demand) of the treated supernatant is less than 1000mg/l, and the wet sludge amount generated by each ton of wastewater is about 16.2 kg. Up to over 100 tons of hazardous waste are required to be disposed of by ship each year. The dilute acrylic emulsion reduces COD by a coagulating sedimentation method, and then is subjected to further biochemical treatment, thereby not only consuming a large amount of medicament and generating a large amount of sludge, but also wasting valuable acrylic emulsion. In order to protect the environment and reduce the production cost, the recovery of the acrylic emulsion must be carried out.
In the existing recovery methods of similar emulsions, ultrafiltration methods are generally adopted to concentrate and recover high molecular emulsions, and the main research focuses on adopting different types of ultrafiltration membranes (hollow ultrafiltration membranes or flat ultrafiltration membranes) and adopting different process methods to concentrate and recover emulsions according to the difference of the ultrafiltration membranes. For example: in patent application No. CN199210004394.0, the inventor proposes an ultrafiltration method for recovering polymer latex from white water, wherein ultrafiltration membranes of hollow fibers are used to filter the white water in a cross flow manner and concentrate the polymer latex in the recovered white water. In patent application No. CN200010018658.3, the inventor proposes an ultrafiltration method for recovering polymer latex from white liquor, wherein the method involves filtering white liquor with a vibrating flat plate ultrafiltration membrane by surging and concentrating the polymer emulsion in the recovered white liquor. However, for dilute acrylic emulsion, no matter a hollow ultrafiltration membrane or a flat ultrafiltration membrane is adopted for concentration and recovery, the problems of limited operation pressure and temperature, serious pollution and blockage of the membrane by colloid COD, difficult recovery of the flux of a conventional chemical cleaning membrane, short service life of the ultrafiltration membrane and the like exist.
Disclosure of Invention
The invention provides a recovery device and a treatment method of dilute acrylic emulsion, which aim to solve the problems of limited operation pressure and temperature, difficult recovery of the flux of a conventional chemical cleaning membrane, short service life of an ultrafiltration membrane and the like in the prior art.
The technical scheme of the invention is as follows:
the utility model provides a recovery unit of rare acrylic acid emulsion which characterized in that mainly includes: a circulating concentration tank and a tubular inorganic ultrafiltration membrane; the discharge port of the circulating concentration tank is connected with the suction port of the feed pump, the discharge port of the feed pump is connected with the suction port of the circulating pump through a pump front pipeline, and the discharge port of the circulating pump is connected with the feed port of the tubular inorganic ultrafiltration membrane through a feed pipeline; the outlet of the concentrated solution of the tubular inorganic ultrafiltration membrane is connected with a first circulating pipeline, and a circulating loop is formed by the first circulating pipeline, a second circulating pipeline, the pipeline before the pump, the circulating pump and the feeding pipeline; a concentrated solution pipeline is arranged on the first circulating pipeline or the second circulating pipeline and is connected with the circulating concentration tank; a filtrate outlet of the tubular inorganic ultrafiltration membrane is connected with a filtrate storage tank through a water production pipeline; the discharge gate of circulation concentration jar still is connected with the blow-off pump, the blow-off pump is connected with the concentrated fluid reservoir.
Further, the recovery device of the dilute acrylic emulsion also comprises an online cleaning system; the online cleaning system mainly comprises: the discharge port of the flushing tank and the discharge port of the CIP cleaning tank are respectively connected with the suction inlet of the cleaning pump; the discharge hole of the cleaning pump is connected with the pump front pipeline through a cleaning pipeline, and a cleaning valve is arranged on the cleaning pipeline; a washing discharge pipe is arranged on the first circulating pipeline or the second circulating pipeline and is connected with the filtrate storage tank, and a washing return pipe is also arranged and is connected with the CIP washing tank; and a cleaning water production return pipe is arranged on the water production pipeline and is connected with the CIP cleaning tank.
The invention discloses a method for treating dilute acrylic emulsion, which is characterized in that the recovery device of the dilute acrylic emulsion comprises the following steps: a. sending the dilute acrylic acid waste liquid into the stock solution tank for storage, sending the dilute acrylic acid waste liquid into the filter by the stock solution pump for filtration, and then sending the dilute acrylic acid waste liquid into the circulating concentration tank; b. the feed liquid in the circulating concentration tank is sent to a suction inlet of the circulating pump by the feed pump, the feed liquid enters the tubular inorganic ultrafiltration membrane under the driving of the circulating pump, and the filtrate produced under pressure is sent to the filtrate storage tank; c. part of the concentrated solution flows back to the circulating concentration tank through the concentration pipeline and is mixed with fresh acrylic waste liquid; the rest concentrated solution flows back to a suction inlet of the circulating pump through the circulating loop and is sent into the tubular inorganic ultrafiltration membrane for continuous concentration; d. and stopping the machine when the residual volume or solid content of the concentrated solution in the circulating concentration tank meets the requirement, and completely discharging the concentrated solution remained in the circulating concentration tank and the tubular inorganic ultrafiltration membrane from the discharge pump and sending the concentrated solution into the concentrated solution tank.
Further, the amount of the concentrated solution in the step c which flows back to the circulating concentration tank is 1/4-1/2 of the flow rate of the feeding pump; the membrane operation pressure in the tubular inorganic ultrafiltration membrane is controlled to be 0.2-1.0 Mpa, the surface flow rate is controlled to be 3-6 m/s, and the operation temperature is controlled to be 10-80 ℃.
Furthermore, the final solid content of the concentrated solution in the circulating concentration tank is required to be more than 20%.
Further, the treatment method of the dilute acrylic emulsion further comprises the following cleaning process: e. carrying out water washing: flushing water flows out of the flushing tank and is sent into the cleaning pipeline through the cleaning pump; washing water enters the tubular inorganic ultrafiltration membrane through the washing valve; the flushed waste water flows into the filtrate storage tank through the flushing discharge pipe; f. carrying out chemical cleaning: cleaning liquid flows out of the CIP cleaning tank and is sent into the cleaning pipeline through the cleaning pump, the cleaning liquid enters the tubular inorganic ultrafiltration membrane through the cleaning valve, cleaning waste liquid after cleaning flows back to the CIP cleaning tank through the cleaning return pipe, and produced water flows back to the CIP cleaning tank through the cleaning produced water return pipe; g. repeating the step e and carrying out water washing again; the cleaning process can be completed.
The recovery device and the treatment method of the dilute acrylic emulsion have the following remarkable advantages and characteristics: the recovery of the high added value of the propylene emulsion is realized, and the recovery rate of the propylene emulsion can reach more than 90 percent; the wastewater treatment amount can be reduced by 5%, the chemical agent amount can be reduced by 90%, the sludge amount can be reduced by 90%, and the total operation cost of wastewater is reduced; the operation condition of the ultrafiltration membrane is simplified, the operation pressure and temperature range are enlarged, the pollution resistance of the ultrafiltration membrane is improved, the online cleaning is convenient, the recovery capability is strong, and the service life of the ultrafiltration membrane is prolonged.
Drawings
FIG. 1 is a schematic view of a recovering apparatus of a dilute acrylic emulsion of the present invention;
wherein: 1-a raw liquid tank, 2-a raw liquid pump, 3-a filter, 4-a circulating concentration tank, 5-a feeding pump, 6-a circulating pump, 7-a tubular inorganic ultrafiltration membrane, 8-a filtrate storage tank, 9-a discharge pump, 10-a concentrated liquid tank, 11-a flushing tank, 12-a CIP cleaning tank and 13-a cleaning pump;
l1-a first circulating pipeline, L2-a second circulating pipeline, L3-a pre-pump pipeline, L4-a feeding pipeline, L5-a concentrated solution return pipe, L6-a water production pipeline, L7-a cleaning pipeline, L8-a flushing discharge pipe, L9-a cleaning return pipe and L10-a cleaning water production return pipe;
v1-raw material valve, V2-liquid return valve, V3-feeding valve, V4-discharging valve, V5-water producing valve, V6-circulating return valve, V7-flushing discharge valve, V8-cleaning discharge valve, V9-cleaning valve, V10-flushing discharge valve, V11-cleaning return valve and V12-cleaning water producing return valve.
Detailed Description
It should be understood by those skilled in the art that the present embodiment is only for illustrating the present invention and is not to be used as a limitation of the present invention, and changes and modifications of the embodiment can be made within the scope of the claims of the present invention.
A recovery device of dilute acrylic emulsion mainly comprises a circulating concentration tank 4 and a tubular inorganic ultrafiltration membrane 7, wherein a discharge port of the circulating concentration tank 4 is connected with a suction port of a feed pump 5, a discharge port of the feed pump 5 is connected with a suction port of a circulating pump 6 through a pre-pump pipeline L3, a discharge port of the circulating pump 6 is connected with a feed port of the tubular inorganic ultrafiltration membrane 7 through a feed pipeline L4, the feed pump 5 supplies acrylic acid waste liquid in the circulating concentration tank 4 to the tubular inorganic ultrafiltration membrane 7 and provides power for membrane separation, the circulating pump 6 provides enough surface flow rate for the tubular inorganic ultrafiltration membrane 7, a concentrated liquid outlet of the tubular inorganic ultrafiltration membrane 7 is connected with a first circulating pipeline L and is connected with a second circulating pipeline L2 through a first circulating pipeline L1, a pre-pump pipeline L3, the circulating pump 6 and the feed pipeline L to form a circulating loop, a concentrated liquid outlet of the tubular inorganic ultrafiltration membrane 7 is connected with a concentrated liquid tank L through a concentrated filtrate pipe 739, a discharge pipe of the filtrate 7 is connected with a discharge tank 8299, and a discharge pipe of the concentrated filtrate tank 7 is connected with a discharge pipe 4939, and a discharge pipe 3 of the filtrate tank 7, and a discharge pipe of the concentrated filtrate tank 9.
Furthermore, a liquid return valve V2 is arranged on the concentrated liquid pipeline L5 and used for controlling the amount of concentrated liquid returned to the circulating concentration tank 4, a feeding valve V3 is arranged on the pipeline L3 in front of the pump, a discharging valve V4 is further arranged on a pipeline connecting a discharge port of the circulating concentration tank 4 with the discharging pump 9 and used for controlling the discharge of the concentrated liquid, a water production valve V5 is arranged on the water production pipeline L6 and used for controlling the amount of produced water, and a circulating return valve V6 is arranged on the circulating pipeline L2 and used for controlling the amount of the circulating concentrated liquid.
Further, the feed inlet of the circulating concentration tank 4 is connected with the discharge outlet of the filter 3; the feed inlet of the filter 3 is connected with the discharge outlet of the raw liquid pump 2, the suction inlet of the raw liquid pump 2 is connected with the discharge outlet of the raw liquid tank 1, and fresh dilute acrylic acid waste liquid is supplied to the circulating concentration tank 4.
Further, the filter 3 is a filter bag type filter with the pore diameter not more than 200 um.
Further, a raw material valve V1 is provided on the pipeline between the filter 3 and the circulation concentration tank 4 for controlling the feeding amount of the circulation concentration tank 4.
Further, the inorganic material of the tubular inorganic ultrafiltration membrane 7 is one or more selected from titanium dioxide, stainless steel and silicon carbide; the aperture of the ultrafiltration membrane is less than or equal to 100 nm.
Furthermore, the tubular inorganic ultrafiltration membrane 7 is at least one set of tubular inorganic ultrafiltration membrane equipment arranged in parallel, and each tubular inorganic ultrafiltration membrane 7 is provided with a single circulating pump 6 to provide sufficient surface flow velocity for the tubular inorganic ultrafiltration membrane 7, make up for pressure loss of feed liquid generated in the tubular inorganic ultrafiltration membrane, and keep the flow of filtrate stable.
Furthermore, the feeding pump 5 and the circulating pump 6 are frequency-conversion-controlled double mechanical seal centrifugal pumps, such as Glan's C L series pumps, which are convenient for adjusting the flow rate and pressure, and the discharging pump 11 is a screw pump.
Furthermore, the device for recovering the dilute acrylic acid emulsion further comprises an online cleaning system, wherein the online cleaning system mainly comprises a discharge port of a flushing tank 11 and a discharge port of a CIP cleaning tank 12 which are respectively connected with a suction port of a cleaning pump 13, the discharge port of the cleaning pump 13 is connected with a pre-pump pipeline L3 through a cleaning pipeline L7, a cleaning valve V9 is arranged on the cleaning pipeline L7, a flushing discharge pipe L8 is arranged on the first circulating pipeline L1 or the second circulating pipeline L2 and connected with the filtrate storage tank 8, a cleaning return pipe L9 is arranged and connected with the CIP cleaning tank 12, and a cleaning product water return pipe L10 is arranged on the product water pipeline L6 and connected with the CIP cleaning tank 12.
Furthermore, a flushing discharge valve V7 is arranged outside the discharge port of the flushing tank 11, a cleaning discharge valve V8 is arranged outside the discharge port of the CIP cleaning tank, a flushing discharge valve V10 is arranged on the flushing discharge pipe L8, a cleaning return valve V11 is arranged on the cleaning return pipeline L9, and a cleaning produced water return valve V12 is arranged on the cleaning produced water return pipeline L10.
Example 1
A laboratory for treating and recycling the dilute acrylic emulsion of a certain foreign enterprise at home comprises the following steps of treating the dilute acrylic emulsion with the treatment capacity of 1000L, the concentration of a medium of 100CP and the acrylic solid content of 1.35 percent:
(1) sending the dilute acrylic acid waste liquid into a stock solution tank 1 for storage, sending the dilute acrylic acid waste liquid into a 200um filter bag filter 3 by a stock solution pump 2 for filtration, and then sending the dilute acrylic acid waste liquid into a circulating concentration tank 4;
(2) the acrylic acid waste liquid in the circulating concentration tank 4 is sent to a suction inlet of the circulating pump 6 by the feed pump 5, mixed with the returned concentrated liquid and then sent to the tubular inorganic ultrafiltration membrane 7 by the circulating pump 6, under the push of the circulating pump 6, the acrylic acid waste liquid flows in parallel on the inner surface of the tubular inorganic ultrafiltration membrane 7, water and small molecular substances are separated by the filter membrane under the pressure (0.41 MPa) of the feed pump 5 and sent to the filtrate storage tank 8 as filtrate, acrylic acid emulsion is intercepted and then discharged out of the first circulating pipeline L1 as the concentrated liquid, the initial membrane flux 175 MH is 175L MH, and the membrane flux at the concentration end is 51L MH;
(3) 1/3 concentrated solution with the flow rate of the feeding pump flows back to the circulating concentration tank 4 through the concentration pipeline L5 to be mixed with fresh acrylic acid waste liquid, and the rest concentrated solution flows back to a suction port of the circulating pump 6 through the first circulating loop L1 and the second circulating loop L2 to be circularly filtered, wherein the temperature of feed liquid is increased to 60 ℃ from 30 ℃ initially during concentration;
(4) stopping the machine when the solid content of the acrylic emulsion in the circulating concentration tank reaches 20%, completely discharging the concentrated solution remained in the circulating concentration tank 4 and the tubular inorganic ultrafiltration membrane 7 through a discharge pump 9, and sending the concentrated solution into a concentrated solution tank 12 to finally obtain a transparent and clear filtrate 1865L of 684mg/l, and obtain a concentrated solution 65L with the solid content of 20%.
And (3) cleaning: after each batch of separation process is finished, in order to recover the filtering capacity of the system and enable the next batch of emulsion to be separated smoothly, the system needs to be cleaned:
(1) flushing is carried out, wherein a flushing feed valve V7 is opened, flushing water flows out of a flushing tank 11 and is sent into a cleaning pipeline L7 through a cleaning pump 13, at the moment, a feed valve V3 is closed, a circulating pump 6, a circulating return valve V6 and a water production valve V5 are closed, a cleaning valve V9 and a flushing discharge valve V10 are opened, the flushing water enters the tubular inorganic ultrafiltration membrane 7, and flushing waste water flows into a filtrate storage tank 8 through a flushing discharge pipe L8;
(2) performing chemical cleaning, namely using NaOH solution with the temperature of 65 ℃ and the mass fraction of 5% as CIP cleaning solution, opening a cleaning feed valve V8, enabling the cleaning solution to flow out of a CIP cleaning tank 12 and be sent into a cleaning pipeline L7 through a cleaning pump 13, closing a feed valve V3, closing a circulating pump 6, a circulating reflux valve V6, a water production valve V5 and a cleaning discharge valve V10, closing a cleaning valve V9, a cleaning reflux valve V11 and a cleaning water production reflux valve V12, enabling the cleaning solution to enter the tubular inorganic ultrafiltration membrane 7, enabling the cleaning solution to flow back to the CIP cleaning tank through a cleaning reflux pipe L9, and enabling the produced water to flow back to the CIP cleaning tank through a cleaning water production reflux pipe L10;
(3) repeating the step (1) and washing with water again; the cleaning process can be completed.
Example 2
The treatment capacity of the dilute acrylic emulsion is 2000L, the treated acrylic solid content is 0.5%, the conductivity is 429us/cm, and the pH value is 8.04;
the treatment process comprises the following steps:
(1) sending the dilute acrylic acid waste liquid into a stock solution tank 1 for storage, sending the dilute acrylic acid waste liquid into a 150-micron filter bag filter 3 by a stock solution pump 2 for filtration, and then sending the dilute acrylic acid waste liquid into the circulating concentration tank 4;
(2) the acrylic acid waste liquid in the circulating concentration tank 4 is sent to a suction inlet of the circulating pump 6 by the feed pump 5, mixed with a refluxed concentrated solution and then sent to the tubular inorganic ultrafiltration membrane 7 by the circulating pump 6, under the pushing of the circulating pump 6, the acrylic acid waste liquid flows in parallel on the inner surface of the tubular inorganic ultrafiltration membrane 7, water and small molecular substances are separated through the filter membrane under the pressure (0.38 MPa) of the feed pump 5 and sent to the filtrate storage tank 8 as filtrate, acrylic acid emulsion is intercepted and then discharged out of the first circulating pipeline L1 as the concentrated solution, the initial membrane flux is 250L MH, and the membrane flux at the concentration end is 40L MH;
(3) 1/4 concentrated solution with the flow rate of the feeding pump flows back to the circulating concentration tank 4 through the concentration pipeline L5 to be mixed with fresh acrylic acid waste liquid, and the rest concentrated solution flows back to a suction port of the circulating pump 6 through the first circulating loop L1 and the second circulating loop L2 to be circularly filtered, wherein the temperature of feed liquid is increased to 65 ℃ from 30 ℃ initially during concentration;
(4) stopping the machine when the solid content of the acrylic emulsion in the circulating concentration tank reaches 20%, completely discharging the concentrated solution remained in the circulating concentration tank 4 and the tubular inorganic ultrafiltration membrane 7 through a discharge pump 9, and sending the concentrated solution into a concentrated solution tank 12 to finally obtain transparent and clear filtrate 1955L of 576mg/l, and obtain concentrated solution 45L with the solid content of 22%.
And (3) cleaning: after each batch of separation process is finished, in order to recover the filtering capacity of the system and smoothly separate the next batch of emulsion, the system needs to be cleaned, and the cleaning process is the same as that in the embodiment 1.
Claims (13)
1. A recovery device of dilute acrylic emulsion is characterized by mainly comprising a circulating concentration tank (4) and a tubular inorganic ultrafiltration membrane (7), wherein a discharge port of the circulating concentration tank (4) is connected with a suction port of a feed pump (5), a discharge port of the feed pump (5) is connected with a suction port of a circulating pump (6) through a pre-pump pipeline (L3), a discharge port of the circulating pump (6) is connected with a feed port of the tubular inorganic ultrafiltration membrane (7) through a feed pipeline (L4), a concentrated solution outlet of the tubular inorganic ultrafiltration membrane (7) is connected with a first circulating pipeline (L01) and forms a circulating loop through the first circulating pipeline (L) and a second circulating pipeline (L2), the pre-pump pipeline (L), the circulating pump (6) and the feed pipeline (L), a concentrated solution pipeline (735) is arranged on the first circulating pipeline (L) or the second circulating pipeline (L) and is connected with the circulating concentration tank (4), a concentrated solution outlet of the tubular inorganic ultrafiltration membrane (7) is connected with a discharge tank (8299), and a discharge outlet of the concentrated solution tank (7) is connected with a discharge pump (9) and a concentrated solution tank (8299).
2. The apparatus for recovering a dilute acrylic emulsion according to claim 1, wherein a return valve (V2) is provided in said concentrated solution line (L5), a feed valve (V3) is provided in said pre-pump line (L3), a discharge valve (V4) is further provided in a line connecting a discharge port of said circulation concentration tank (4) and said discharge pump (9), a water production valve (V5) is provided in said water production line (L6), and a circulation return valve (V6) is provided in said circulation line (L2).
3. The apparatus for recovering a dilute acrylic emulsion according to claim 1, wherein the inlet of the circulating concentration tank (4) is connected to the outlet of the filter (3); the feed inlet of the filter (3) is connected with the discharge outlet of the stock solution pump (2), and the suction inlet of the stock solution pump (2) is connected with the discharge outlet of the stock solution tank (1).
4. The apparatus for recovering a dilute acrylic emulsion according to claim 3, wherein the filter (3) is a bag filter having a pore size of 200um or less; and a raw material valve (V1) is also arranged on a pipeline between the filter (3) and the circulating concentration tank (4).
5. The apparatus for recovering a dilute acrylic emulsion according to claim 1, wherein the inorganic material of the tubular inorganic ultrafiltration membrane (7) is one or more selected from titanium dioxide, stainless steel and silicon carbide; the aperture of the ultrafiltration membrane is less than or equal to 100 nm.
6. The apparatus for recovering dilute acrylic emulsion according to claim 1, wherein the tubular inorganic ultrafiltration membrane (7) is at least one set of tubular inorganic ultrafiltration membrane equipment arranged in parallel, and each tubular inorganic ultrafiltration membrane (7) is provided with a separate circulating pump (6).
7. The apparatus for recovering a dilute acrylic emulsion according to claim 1, wherein said feed pump (5) and said circulating pump (6) are two mechanical seal centrifugal pumps controlled by variable frequency; the discharge pump (11) is a screw pump.
8. The apparatus for recovering a dilute acrylic emulsion according to any one of claims 1 to 7, further comprising an online cleaning system, wherein the online cleaning system mainly comprises a discharge port of a flushing tank (11) and a discharge port of a CIP cleaning tank (12) which are respectively connected with a suction port of a cleaning pump (13), the discharge port of the cleaning pump (13) is connected with the pre-pump pipeline (L3) through a cleaning pipeline (L7) and a cleaning valve (V9) is arranged on the cleaning pipeline (L7), a cleaning discharge pipe (L8) is arranged on the first circulating pipeline (L1) or the second circulating pipeline (L2) and connected with the filtrate storage tank (8), a cleaning return pipe (L9) is arranged and connected with the CIP cleaning tank (12), and a cleaning water production pipe (L10) is arranged on the water production pipe (L6) and connected with the return pipe (12).
9. The apparatus for recovering a dilute acrylic acid emulsion according to claim 8, wherein a rinse discharge valve (V7) is provided outside a discharge port of the rinse tank (11), a cleaning discharge valve (V8) is provided outside a discharge port of the CIP cleaning tank, a rinse discharge valve (V10) is provided on the rinse discharge pipe (L8), a cleaning return valve (V11) is provided on the cleaning return pipe (L9), and a cleaning product water return valve (V12) is provided on the cleaning product water return pipe L10.
10. A method for treating dilute acrylic emulsion, characterized in that, the recovery device of dilute acrylic emulsion of claim 8 is adopted, comprising the steps of a, sending dilute acrylic waste liquid to the raw liquid tank (1) for storage, sending the raw liquid pump (2) to the filter (3) for filtration, and then sending the liquid to the circulating concentration tank (4), b, sending the liquid in the circulating concentration tank (4) to the suction port of the circulating pump (6) by the feed pump (5), sending the liquid to the tubular inorganic ultrafiltration membrane (7) under the driving of the circulating pump (6), sending the filtrate produced under pressure to the filtrate storage tank (8), c, returning a part of the concentrated liquid to the circulating concentration tank (4) through the concentration pipeline (L5) to be mixed with fresh acrylic waste liquid, returning the rest of the concentrated liquid to the circulating pump (6) through the circulating loop (L1-L2), sending the concentrated liquid to the suction port (7) for continuous concentration, d, sending the concentrated liquid to the circulating concentration tank (4) when the residual concentrated liquid in the circulating tank (4) reaches the requirement, and sending the concentrated liquid to the circulating concentration tank (4) to be discharged from the circulating pump (10).
11. The method for treating dilute acrylic emulsion according to claim 10, wherein the amount of the concentrated solution in the step c returned to the circulating concentration tank (4) is 1/4-1/2 of the flow rate of the feed pump (5); the membrane operation pressure in the tubular inorganic ultrafiltration membrane (7) is controlled to be 0.2-1.0 Mpa, the surface flow rate is controlled to be 3-6 m/s, and the operation temperature is controlled to be 10-80 ℃.
12. The method for treating dilute acrylic emulsion according to claim 10, further comprising a cleaning process of e, performing water washing, wherein washing water flows out from the washing tank (11) and is sent into the cleaning pipeline (L7) through the cleaning pump (13), the washing water enters the tubular inorganic ultrafiltration membrane (7) through the cleaning valve (V9), washing wastewater flows into the filtrate storage tank (8) through the washing discharge pipe (L8), f, performing chemical cleaning, wherein cleaning liquid flows out from the CIP cleaning tank (12) and is sent into the cleaning pipeline (L7) through the cleaning pump (13), the cleaning liquid enters the tubular inorganic ultrafiltration membrane (7) through the cleaning valve (V9), cleaning waste liquid after cleaning flows back into the CIP cleaning tank (12) through the cleaning return pipe (L9), and product water flows back into the cleaning tank (12) through the cleaning product water return pipe (CIP L10), g, repeating the step e, and performing water washing once again, thereby completing the cleaning process.
13. The method for treating a dilute acrylic emulsion according to claim 10, wherein the cleaning liquid in the CIP cleaning tank (12) is a NaOH solution having a temperature of 60 to 80 ℃ and a mass fraction of 1 to 5%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113385035A (en) * | 2021-06-09 | 2021-09-14 | 海南天然橡胶产业集团股份有限公司 | Automatic colloidal-clear concentration system and concentration method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113385035A (en) * | 2021-06-09 | 2021-09-14 | 海南天然橡胶产业集团股份有限公司 | Automatic colloidal-clear concentration system and concentration method thereof |
| WO2022257242A1 (en) * | 2021-06-09 | 2022-12-15 | 海南天然橡胶产业集团股份有限公司 | Automatic skim latex concentration system and concentration method thereof |
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