CN211358847U - Acrylic polymer production device with different molecular weights and distribution ranges - Google Patents
Acrylic polymer production device with different molecular weights and distribution ranges Download PDFInfo
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- CN211358847U CN211358847U CN201921605180.0U CN201921605180U CN211358847U CN 211358847 U CN211358847 U CN 211358847U CN 201921605180 U CN201921605180 U CN 201921605180U CN 211358847 U CN211358847 U CN 211358847U
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Abstract
The utility model discloses an acrylic polymer production device with different molecular weights and distribution ranges, which comprises a steam jet reactor and a pipeline reactor, wherein the pipeline reactor is vertically arranged and is connected with a material outlet of the steam jet reactor; the pipeline reactor comprises: the upper end pipeline, the circuitous pipeline and the lower end pipeline are sequentially arranged along the material flow direction; a steam condensing reflux pipe for condensing reflux steam; the molecular weight adjusting pipeline and a first valve for opening and closing the molecular weight adjusting pipeline; when the first valve is opened, the material in the pipeline reactor can enter the lower end pipeline from the molecular weight regulating pipeline, so that the stroke of the material in the circuitous pipeline is reduced. The advantages are that: the production of acrylic polymer products with different molecular weights and different molecular weight distribution ranges can be realized by adopting the same production device, and the equipment investment and the land occupation investment are greatly reduced.
Description
Technical Field
The utility model relates to a polymerization reaction device, in particular to a production device for acrylic polymers.
Background
The acrylic polymer mentioned in the industry mainly refers to polyacrylic acid homopolymer polymerized from acrylic acid, or copolymer polymerized from acrylic acid and other raw materials, such as maleic copolymer copolymerized from maleic acid and acrylic acid, and also includes sodium salt, such as sodium polyacrylate, etc. formed by neutralizing with alkaline agent, such as sodium hydroxide.
It is well known in the art that the difference in molecular weight of acrylic polymers has a significant effect on the application properties thereof, and therefore, the production of acrylic polymers of different molecular weight sizes and different molecular weight distribution ranges for different uses of acrylic polymers is an important subject of research in the art.
At present, a production device of an acrylic polymer mainly adopts a polymerization reaction kettle, and the production mode is that raw materials such as a monomer, an initiator, a chain transfer agent and the like are added into the reaction kettle and react at a proper temperature for a proper reaction time to obtain a product. In the scheme, although the molecular weight distribution of the product can be controlled to a certain extent by factors such as the type and proportion of the initiator, the type and amount of the chain transfer agent, the reaction temperature, the monomer concentration, the stirring speed, the feeding program, the feeding speed and the like, the method is limited by the full mixing characteristic of the tank reactor, the material backmixing is serious, and the product with narrow molecular weight distribution is difficult to obtain. On the other hand, the polymerization reaction kettle needs to be fed in batches, only batch production can be carried out, which easily causes inconsistent product quality of each batch and influences sale and use. And thirdly, in the production of the kettle type reactor, because the polymerization heat of the monomers is large and the closed reaction is carried out, the implosion is easy to occur, and the potential safety hazard is great.
In order to solve the above problems, a tubular reactor is proposed to replace a kettle reactor, so as to better solve the problem of material back mixing, obtain a product with narrow molecular weight distribution, simultaneously realize continuous reaction and normal pressure reaction, and simultaneously solve the problems of product quality fluctuation and implosion, but the tubular reactor still has the defects:
1. the tubular reactor is theoretically a plug flow reactor, but actually, because the polymer has viscosity, the dragging effect of the retention layer on the tube wall is greatly influenced, and the production of the acrylic polymer needs long-time polymerization to be completed, so that the reaction time is long, the tube length is long, and the back mixing caused by the dragging effect of the retention layer in the tube cannot be easily considered.
2. The polymerization reaction heat effect of the acrylic acid is large, if the reaction temperature is high, the reaction speed is high, a reaction high-temperature area exists, and the product is discolored due to the existence of the high-temperature area; on the other hand, if the reaction temperature is low, the reaction time is long, and a long line is required, which makes industrial implementation difficult.
To solve the above problems, patent document CN104277142A discloses a method for producing a narrow distribution low molecular weight polymer, which comprises setting a steam jet reactor to rapidly polymerize monomers in the reactor, so that most of the polymerization reaction is completed in the steam jet reactor, thereby significantly reducing the reaction time of materials in a pipeline reactor, improving the back-mixing phenomenon, and obtaining a product with low molecular weight and a narrower molecular weight distribution range. However, this solution still has drawbacks:
as described above, depending on the use of the acrylic polymer, the molecular weight and molecular weight distribution of the product are required to be different. Although the solutions of the above patent documents can obtain polymers having narrow molecular weights, it is difficult to adjust the molecular weight of the product and the molecular weight distribution range in production. Therefore, depending on the use of the product, when it is desired to produce a polymer product having a high molecular weight or a polymer product having a wide molecular weight distribution in a special case, the apparatus cannot be satisfied, only the production apparatus can be replaced, and the production apparatus is large in investment and very troublesome.
SUMMERY OF THE UTILITY MODEL
In order to realize the production of acrylic polymer products with different molecular weights and different molecular weight distributions by adopting the same production device, the utility model provides an acrylic polymer production device.
The utility model provides a technical scheme that its technical problem adopted is: an acrylic polymer production apparatus comprising:
a steam injection reactor;
the pipeline reactor is vertically arranged and is connected with a material outlet of the steam jet reactor;
the pipeline reactor comprises:
the upper end pipeline, the circuitous pipeline and the lower end pipeline are sequentially arranged along the material flow direction;
a steam condensing reflux pipe for condensing reflux steam;
the molecular weight adjusting pipeline and a first valve for opening and closing the molecular weight adjusting pipeline; when the first valve is opened, the material in the pipeline reactor can enter the lower end pipeline from the molecular weight regulating pipeline, so that the stroke of the material in the circuitous pipeline is reduced.
The device may be used as follows:
(1) when a high molecular weight product needs to be produced, the first valve is closed, the material enters the pipeline reactor after being rapidly reacted by the steam jet reactor, and flows through the upper end pipeline, the circuitous pipeline and the lower end pipeline in the pipeline reactor in sequence to complete the reaction, and the product is obtained after discharging. Since the material is still at its reaction temperature, which is relatively high when flowing through the circuitous conduit, the circuitous conduit increases the reaction time of the material at the appropriate temperature to promote more polymerization of the acrylic acid and thereby form a higher molecular weight polymer. The method is easy to obtain the product with the molecular weight distribution range of 7000-20000.
(2) When a low molecular weight product needs to be produced, the first valve is opened, so that the material directly enters the lower end pipeline from the molecular weight adjusting pipeline, and does not pass through a subsequent roundabout segment, so that a product with a higher molecular weight cannot be polymerized, and the obtained product is a low molecular weight product. The method is easy to obtain products with the molecular weight distribution range of 1000-7000.
(3) When a product with a wide molecular weight distribution range needs to be produced under special conditions, a part of materials can directly enter the lower end pipeline from the molecular weight adjusting pipeline by adjusting the opening degree of the first valve and matching the feeding speed, and the other part of materials still need to pass through all roundabout pipelines, so that the product with the molecular weight distribution range of 1000-20000 can be obtained.
It is easy to understand that the upper end pipeline, the circuitous pipeline and the lower end pipeline can be integrally formed to form the pipeline reactor, and can also be detachably connected to form the pipeline reactor, preferably detachably connected to facilitate the cleaning, maintenance and transfer of equipment.
The circuitous pipes can be coiled pipes, and besides the coiled pipes, other circuitous pipe forms which are common in the field, such as annular circuitous pipes and the like, can also be adopted.
More preferably, the serpentine pipe is roundabout up and down on a vertical plane and comprises n roundabout parts, and n is an even number which is greater than or equal to 2. Therefore, the opening of the material outlet end of the coiled pipe is downward, the material can flow in the pipeline reactor conveniently, and the arrangement of the molecular weight adjusting pipeline is convenient.
Preferably, a roundabout part of the serpentine pipe close to the upper end pipeline is a first roundabout part, and the first roundabout part is provided with a second valve for discharging materials in the first roundabout part. Because the steam pressure generated by the steam generator must be ensured to be stable before the reaction is carried out in the steam jet reactor, the steam pressure needs to be adjusted before the reaction, and the reaction is carried out after the steam pressure is stable. During this period, the condensed water produced by the steam is collected in the first detour part of the coiled pipe, and the condensed water can be discharged through the second valve. In addition, the second valve has another function of facilitating the sampling control in the reaction.
The utility model provides a concrete arrangement of molecular weight regulation pipeline, as shown in FIG. 1, when serpentine pipeline circuitous about on vertical plane and had 2 circuitous portions, molecular weight regulation pipeline communicates between the material exit end of first circuitous portion and lower extreme pipeline. When the first valve is opened, the material will enter the back end pipeline from the molecular weight regulating pipeline. As can be seen from fig. 2, the material outlet end of the first roundabout portion of the present invention means that the material leaves the end of the first roundabout portion when flowing through the first roundabout portion.
As a further improvement of the utility model, the packing column can be arranged in the front end pipeline, so that the raw materials flowing through the packing column are mixed uniformly and better reaction effect is achieved.
As a further improvement of the utility model, the steam jet reactor includes a steam jet reactor main body, a steam generator connected to the steam jet reactor main body through a steam pipe, and a feed pipe group for feeding the steam jet reactor main body.
The utility model has the advantages that: the production of acrylic polymer products with different molecular weights and different molecular weight distribution ranges can be realized by adopting the same production device, and the equipment investment and the land occupation investment are greatly reduced.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of a first detour structure.
Labeled as: 101-steam jet reactor body, 102-steam generator, 103-feeding pipe group, 201-upper end pipeline, 202-circuitous pipeline, 203-lower end pipeline, 204-steam condensation return pipe, 205-molecular weight regulating pipeline, 206-first valve, 207-second valve, 208-filling column and 209-discharge valve.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
As shown in figure 1, the acrylic polymer production device of the utility model comprises a steam jet reactor and a pipeline reactor, wherein the pipeline reactor is vertically arranged and is connected with a material outlet of the steam jet reactor; the pipeline reactor comprises: an upper end pipeline 201, a circuitous pipeline 202 and a lower end pipeline 203 which are arranged in sequence along the material flow direction; and a vapor condenser return line 204 for condensing the return vapor; further comprises a molecular weight adjusting pipeline 205 and a first valve 206 for opening and closing the molecular weight adjusting pipeline 205; when the first valve 206 is opened, the material in the pipe reactor can enter the lower pipe 203 from the molecular weight adjusting pipe 205, thereby reducing the stroke of the material in the detour pipe 202. A packing column 208 is arranged in the upper end pipeline 201; the steam injection reactor includes a steam injection reactor body 101, a steam generator 102 connected to the steam injection reactor body 101 through a steam pipe, and a feed tube group 103 for feeding the steam injection reactor body 101.
The circuitous pipeline 202 is a coiled pipe, the coiled pipe is circuitous up and down on a vertical plane, and comprises 2 circuitous parts; a circuitous part of the coiled pipe close to the upper end pipeline 201 is a first circuitous part, and the first circuitous part is provided with a second valve 207 for discharging materials in the first circuitous part; the molecular weight regulating pipe 205 is communicated between the material outlet end of the first detour portion and the lower end pipe 203.
During operation, according to the production requirement, if the low molecular weight product is produced and the molecular weight is less than 7000, the first valve 206 is fully opened, and if the product with the molecular weight of 7000-20000 is produced, the first valve 206 is closed. And then, opening the steam generator 102, adjusting the steam pressure according to the yield, wherein the steam pressure is generally 0.1-0.4 MPa, and discharging condensed water for adjusting the steam through a second valve 207 after the steam is stabilized. Then, acrylic acid, an initiator and a chain transfer agent are fed into the reactor through a feeding pipe group 103 at a constant speed, and the feeding speed is adjusted according to production requirements. Under the spraying action of steam, the material is instantaneously atomized and heated by the steam, most of the reaction is completed within a few seconds, and in the process, the steam entering the pipeline reactor is condensed into deionized water by the steam condensing and returning pipe and enters the product to play a role in adjusting the solid content of the product. The material then enters the pipeline reactor to continue the reaction, and products with different molecular weights and different molecular weight distribution ranges can be obtained in the pipeline reactor by controlling the opening and closing of the first valve 206. Finally, sampling and central control are carried out through a second valve 207, and after the sampling is qualified, a discharge valve 209 is opened to obtain a product.
Claims (9)
1. An acrylic polymer production apparatus comprising:
a steam injection reactor;
the pipeline reactor is vertically arranged and is connected with a material outlet of the steam jet reactor;
characterized in that the pipe reactor comprises:
the upper end pipeline, the circuitous pipeline and the lower end pipeline are sequentially arranged along the material flow direction;
a steam condensing reflux pipe for condensing reflux steam;
the molecular weight adjusting pipeline and a first valve for opening and closing the molecular weight adjusting pipeline; when the first valve is opened, the material in the pipeline reactor can enter the lower end pipeline from the molecular weight regulating pipeline, so that the stroke of the material in the circuitous pipeline is reduced.
2. The acrylic polymer production apparatus according to claim 1, characterized in that: the upper end pipeline, the circuitous pipeline and the lower end pipeline are integrally formed.
3. The acrylic polymer production apparatus according to claim 1, characterized in that: the upper end pipeline, the circuitous pipeline and the lower end pipeline are detachably connected.
4. The acrylic polymer production apparatus according to claim 1, characterized in that: the circuitous pipeline is a coiled pipe.
5. The acrylic polymer production apparatus according to claim 4, characterized in that: the serpentine pipe is roundabout up and down on a vertical plane and comprises n roundabout parts, wherein n is an even number which is greater than or equal to 2.
6. The acrylic polymer production apparatus according to claim 5, characterized in that: the tortuous portion that the coiled pipe is close to upper end pipeline is first tortuous portion, first tortuous portion is provided with the second valve that is used for discharging the material in first tortuous portion.
7. The acrylic polymer production apparatus according to claim 6, characterized in that: the snakelike pipeline is provided with 2 circuitous parts, and the molecular weight adjusting pipeline is communicated between a material outlet end of the first circuitous part and the lower end pipeline.
8. The acrylic polymer production apparatus as claimed in any one of claims 1 to 7, wherein: and a packing column is arranged in the upper end pipeline.
9. The acrylic polymer production apparatus as claimed in any one of claims 1 to 7, wherein: the steam jet reactor comprises a steam jet reactor body, a steam generator connected with the steam jet reactor body through a steam pipeline, and a feeding pipe group used for feeding materials to the steam jet reactor body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921605180.0U CN211358847U (en) | 2019-09-25 | 2019-09-25 | Acrylic polymer production device with different molecular weights and distribution ranges |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921605180.0U CN211358847U (en) | 2019-09-25 | 2019-09-25 | Acrylic polymer production device with different molecular weights and distribution ranges |
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| Publication Number | Publication Date |
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| CN211358847U true CN211358847U (en) | 2020-08-28 |
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| CN201921605180.0U Active CN211358847U (en) | 2019-09-25 | 2019-09-25 | Acrylic polymer production device with different molecular weights and distribution ranges |
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