CN215917343U - Parallel type industrialized esterification reaction device - Google Patents
Parallel type industrialized esterification reaction device Download PDFInfo
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- CN215917343U CN215917343U CN202121921711.4U CN202121921711U CN215917343U CN 215917343 U CN215917343 U CN 215917343U CN 202121921711 U CN202121921711 U CN 202121921711U CN 215917343 U CN215917343 U CN 215917343U
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Abstract
The utility model discloses a parallel type industrial esterification reaction device which comprises a first esterification reaction kettle and a second esterification reaction kettle, wherein steam outlets are formed in the tops of the first esterification reaction kettle and the second esterification reaction kettle, a first esterification tower is connected to the steam outlet of the first esterification reaction kettle, a second esterification tower is connected to the steam outlet of the second esterification reaction kettle, the tops of the first esterification tower and the second esterification tower are connected with a tower top heat exchanger through pipelines, and the bottoms of the first esterification tower and the second esterification tower are connected with a tower kettle pump through pipelines. According to the utility model, the first esterification reaction kettle and the second esterification reaction kettle are respectively provided with the independent esterification towers, the first esterification reaction kettle and the second esterification reaction kettle are respectively rectified and separated, the content of ethylene glycol in the esterification wastewater is reduced to be below 0.06%, the sewage treatment pressure is reduced, the environmental protection benefit is good, and the adjustment is more flexible.
Description
Technical Field
The utility model relates to an industrialized polyester esterification device, in particular to a parallel industrialized esterification reaction device.
Background
The polyester is a general name of a high molecular compound obtained by polycondensation of a dibasic or polybasic acid and a dibasic or polybasic alcohol, and is a polyethylene terephthalate (PET) high molecular compound obtained by Polycondensation of Terephthalic Acid (PTA) and Ethylene Glycol (EG) as raw materials.
The common polyester is generally prepared by esterification and Polycondensation of Terephthalic Acid (PTA) and Ethylene Glycol (EG), and belongs to a crystalline polymer. The copolyester is produced by introducing a third component and even a fourth component in addition to two main components of dibasic acid and dihydric alcohol in the polymerization process to participate in copolymerization, so that an asymmetric molecular structure is generated to form an amorphous copolymer. The amorphous copolyester has excellent chemical corrosion resistance, impact resistance and environmental protection performance, the product is highly transparent, the processing and forming performance is excellent, and the amorphous copolyester can be prepared into plates, sheets, high-performance shrink films, bottle containers and profiled bars. And the amorphous copolyester has excellent secondary processing performance, can be recycled and has the advantage of environmental protection. The product can be widely applied to the fields of cosmetic packaging, food packaging, medical appliances, indoor and outdoor signs, furniture, building materials and the like.
Esterification process columns are important in polyester production, primarily for purifying the process steam (water and EG) produced by the esterification reaction and the gas-phase EG produced by precondensation from the ester, and separating the mixture of water and EG.
The main working flow of the esterification process tower is that water and a small amount of ethylene glycol steam generated in the esterification reaction kettle are discharged from the upper pipeline of the reactor through a pressure control valve and enter the process tower, and ethylene glycol separated by reaction in the pre-polycondensation system is also sent into the process tower for rectification and purification. The process column contains 16 to 18 trays inside, is heated by heating coils inside, and is mainly used for separating low-boiling (water, acetaldehyde) and high-boiling (ethylene glycol) mixtures. Because the liquid level of the tower bottom of the process tower is slightly higher than the mixed steam inlet, a small amount of PTA, oligomer and the like carried in the mixed steam are dissolved in the ethylene glycol at the bottom of the tower bottom. The mixed steam is rectified by a tower plate, the effluent at the top of the tower is mainly water, and the rest is ethers, acetaldehyde and the like, which are condensed in a condenser and collected in a reflux tank, and then the condensed mixed steam is sent to a waste water stripping tower to remove relatively low-boiling-point substances (ethers, aldehydes) in the water, and the pretreated water is partially returned to the process tower through a centrifugal pump to be used as reflux. And (3) taking part of the pretreated water as process tower reflux, and sending the rest of the pretreated water to a stripping tower for treatment.
During the production of copolyester, materials are firstly prepared into slurry in a slurry preparation tank, and then are sequentially sent into a first esterification reaction kettle, a second esterification reaction kettle, a first pre-polycondensation reactor, a second pre-polycondensation reactor, a final polycondensation reactor and a high-viscosity reactor through a material conveying mechanism to react, the intrinsic viscosity of a melt at the outlet of the high-viscosity reactor reaches 0.77-0.85 dl/g, and the dynamic viscosity of the melt reaches 550-800 pa.s, so that a high-viscosity polyester product is obtained. The industrial polyester esterification device composed of the production equipment has the following problems:
1. in the production process of high-viscosity polyester products, the first esterification kettle is a vertical reaction kettle, the second esterification kettle is of a horizontal three-chamber structure, the esterification pressures of the first esterification kettle and the second esterification kettle are respectively controlled, the system pressure is in the adjusting process, the effluent of the process tower changes according to the temperature of the sensitive plate, the temperature fluctuation of the sensitive plate is directly caused by the pressure change, the drainage of the system esterification wastewater can be influenced, the ethylene glycol content in the esterification wastewater is high, and the COD (chemical oxygen demand) fluctuates greatly.
2. The industrial polyester device runs continuously, the process tower also runs continuously, but because the reaction conditions of the first esterification reaction kettle and the first esterification reaction kettle are different in the production process of the high-viscosity polyester, after the two esterification reaction kettles respectively adjust the process parameters, the flow rate and the concentration of the obtained high and low components are fluctuated, and the adjustment results of the respective esterification reaction kettles cannot be directly and quantitatively reflected by one esterification process tower.
3. The process tower has a simple structure and a single adjusting means, when the yield of the high-viscosity polyester product is adjusted and the production fluctuates, the first esterification reaction kettle and the first esterification reaction kettle have different structures, the esterification rate is greatly changed, the reflux EG amount needs to be manually adjusted again according to the test data, the adjustment is delayed, and process accidents such as tower flooding are easily caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of the prior art and provides a parallel type industrialized esterification reaction device which has the advantages of reasonable design, flexible process adjustment, small sewage treatment pressure and good environmental protection benefit.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a parallel industrialization esterification reaction device, which is characterized in that, including first esterification reaction cauldron and second esterification reaction cauldron, the bottom of first esterification reaction cauldron and second esterification reaction cauldron is equipped with the material export, the bottom of second esterification reaction cauldron still is equipped with the material import, the top of first esterification reaction cauldron and second esterification reaction cauldron is equipped with steam outlet, the material export of first esterification reaction cauldron and the material import of second esterification reaction cauldron pass through material delivery pump and are connected, a serial communication port, be connected with first esterification tower in first esterification reaction cauldron's steam outlet department, be connected with the second esterification tower in second esterification reaction cauldron's steam outlet department, there is the top of the tower heat exchanger at the top of first esterification tower and second esterification tower through the pipe connection, there is the tower cauldron pump bottom of first esterification tower and second esterification tower through the pipe connection.
The technical problem to be solved by the utility model can also be realized by the following technical scheme that the first esterification tower and the second esterification tower share one tower top heat exchanger, and a parallel process tower group is formed between the first esterification tower and the second esterification tower and between the first esterification reaction kettle and the second esterification reaction kettle through the tower top heat exchanger.
Compared with the prior art, the esterification towers which are independent are independently arranged on the first esterification reaction kettle and the first esterification reaction kettle, and the first esterification reaction kettle and the second esterification reaction kettle are respectively rectified and separated, so that the first esterification reaction kettle and the first esterification reaction kettle can be ensured to independently adjust the production process without mutual influence. Meanwhile, the rectification separation efficiency of the process tower is improved, the content of ethylene glycol in the esterification wastewater can be reduced to be below 0.06%, the sewage treatment pressure is reduced, the environmental protection benefit is good, and the adjustment is more flexible.
Drawings
FIG. 1 is a block diagram of a parallel type industrial esterification reaction apparatus according to the present invention.
In the figure: 1-a first esterification reaction kettle, 2-a material conveying pump, 3-a first esterification tower, 4-a tower kettle pump, 5-a second esterification reaction kettle, 6-a second esterification tower, 7-a tower kettle pump and 8-a tower top heat exchanger.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1, a parallel type industrial esterification reaction device comprises a first esterification reaction kettle 1 and a second esterification reaction kettle 5, wherein the bottoms of the first esterification reaction kettle 1 and the second esterification reaction kettle 6 are provided with material outlets, the bottom of the second esterification reaction kettle 5 is also provided with a material inlet, the tops of the first esterification reaction kettle 1 and the second esterification reaction kettle 5 are provided with steam outlets, the material outlet of the first esterification reaction kettle 1 is connected with the material inlet of the second esterification reaction kettle 5 through a material conveying pump 2, the steam outlet of the first esterification reaction kettle 1 is connected with a first esterification tower 3, the steam outlet of the second esterification reaction kettle 5 is connected with a second esterification tower 6, the tops of the first esterification tower 3 and the second esterification tower 6 are connected with a tower top heat exchanger 8 through a pipeline, and the bottoms of the first esterification tower 3 and the second esterification tower 6 are connected with a tower kettle pump 4 through a pipeline, And 7, extracting EG in the esterification tower by a tower kettle pump.
First esterification reaction cauldron be equipped with the vertical cauldron body, the internal agitator of installing of vertical cauldron, first esterification reaction cauldron be equipped with the horizontal cauldron body, the internal a plurality of agitators of installing of horizontal cauldron, the agitator sets up side by side along the axis of the horizontal cauldron body.
The first esterification tower 3 and the second esterification tower 6 share one tower top heat exchanger 8, a parallel type process tower group is formed between the tower top heat exchanger 8 and the first esterification reaction kettle 1 and between the first esterification tower 3 and the second esterification tower 6 and the second esterification reaction kettle 5, so that the first esterification reaction kettle and the first esterification reaction kettle can be independently adjusted, the esterification process wastewater of the two esterification tower top towers enters the same air cooler, and the first esterification reaction kettle and the second esterification reaction kettle are respectively provided with a rectification separation process tower, namely an esterification tower, so that the ethylene glycol content in the esterification wastewater is reduced to be below 0.06%, the sewage treatment pressure is reduced, and the environmental protection benefit is good.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (4)
1. The utility model provides a parallel industrialization esterification reaction device, including first esterification reaction cauldron and second esterification reaction cauldron, the bottom of first esterification reaction cauldron and second esterification reaction cauldron is equipped with the material export, the bottom of second esterification reaction cauldron still is equipped with the material import, the top of first esterification reaction cauldron and second esterification reaction cauldron is equipped with steam outlet, the material export of first esterification reaction cauldron and the material import of second esterification reaction cauldron are passed through material delivery pump and are connected, a serial communication port, be connected with first esterification tower in first esterification reaction cauldron's steam outlet department, be connected with the second esterification tower in the steam outlet department of second esterification reaction cauldron, there is the top heat exchanger at the top of first esterification tower and second esterification tower through the pipe connection, there is the tower cauldron pump bottom through the pipe connection in the bottom of first esterification tower and second esterification tower.
2. A parallel type industrial esterification reaction device according to claim 1, wherein the first esterification tower and the second esterification tower share a tower top heat exchanger, and the first esterification tower and the second esterification tower form a parallel type process tower set through the tower top heat exchanger and the first esterification reaction kettle and the second esterification reaction kettle.
3. A parallel type industrial esterification reaction device according to claim 1, wherein the first esterification reaction vessel is provided with a vertical vessel body, and a stirrer is installed in the vertical vessel body.
4. A parallel type industrial esterification reaction device according to claim 1, wherein the first esterification reaction kettle is provided with a horizontal kettle body, a plurality of stirrers are arranged in the horizontal kettle body, and the stirrers are arranged side by side along the axis of the horizontal kettle body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121921711.4U CN215917343U (en) | 2021-08-17 | 2021-08-17 | Parallel type industrialized esterification reaction device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121921711.4U CN215917343U (en) | 2021-08-17 | 2021-08-17 | Parallel type industrialized esterification reaction device |
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| CN215917343U true CN215917343U (en) | 2022-03-01 |
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| CN202121921711.4U Active CN215917343U (en) | 2021-08-17 | 2021-08-17 | Parallel type industrialized esterification reaction device |
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- 2021-08-17 CN CN202121921711.4U patent/CN215917343U/en active Active
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