CN110016098B - Poly (perfluoroethylene-propylene) production condensation washing device - Google Patents
Poly (perfluoroethylene-propylene) production condensation washing device Download PDFInfo
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- CN110016098B CN110016098B CN201910137859.XA CN201910137859A CN110016098B CN 110016098 B CN110016098 B CN 110016098B CN 201910137859 A CN201910137859 A CN 201910137859A CN 110016098 B CN110016098 B CN 110016098B
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
- C08F214/18—Monomers containing fluorine
- C08F214/26—Tetrafluoroethene
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Abstract
The invention belongs to the technical field of production of fluorinated ethylene propylene, and particularly relates to a coagulation washing device for production of fluorinated ethylene propylene, which comprises: the device comprises a condensation barrel, an intermediate tank, a constant-temperature water tank, a recovered water elevated tank, an external drainage pool and a recovered water collecting pool; the middle tank is connected with the upper end of the condensation barrel, the constant-temperature water tank is communicated with the upper part of the condensation barrel, and meanwhile, the constant-temperature water tank is also communicated with the bottom of the condensation barrel; the bottom of the recycled water elevated tank is communicated with the bottom of the coagulation barrel, meanwhile, the top of the recycled water elevated tank is communicated with the recycled water collecting tank, and the outer drainage tank is communicated with the bottom of the coagulation barrel; meanwhile, the reclaimed water collecting tank is communicated with the bottom of the coagulation barrel. The device disclosed by the invention not only realizes the automatic production of the fluorinated ethylene propylene, ensures the stability of product quality, but also realizes energy conservation and water conservation.
Description
Technical Field
The invention belongs to the technical field of production of fluorinated ethylene propylene, and particularly relates to a condensation washing device for production of fluorinated ethylene propylene.
Background
This information disclosed in this background of the invention is only for the purpose of increasing an understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
The production of the fluorinated ethylene propylene in the industrial production is intermittent discontinuous production, and is mostly operated manually, the product quality has great relation with the operation proficiency of operators, and the product quality is not stable enough. After the polymerization of the fluorinated ethylene propylene is finished, coagulation washing is needed, and in the existing industrial production, the coagulation washing steps are all controlled manually, so that the workload is large, and the waste amount of water is large. Patent document CN 102443091B discloses a method for coagulating and washing polyperfluorinated ethylene propylene resin, which comprises preparing a polyperfluorinated ethylene propylene resin polymerization emulsion by an emulsion polymerization method, standing, diluting, stirring for coagulating and washing, wherein a chemical coagulation mode can be supplemented in the stirring and coagulating process. The coagulation washing method provided by the invention combines mechanical coagulation and chemical coagulation, has excellent coagulation effect, is obviously superior to the traditional coagulation method, and the obtained fluorinated ethylene propylene resin has large particle size and large volume density, thereby being beneficial to the further processing of FEP plastics.
Patent document CN 201132823Y discloses a novel fluorinated ethylene propylene resin coacervating device, wherein a stirrer comprising a stirrer rotor, a stirrer stator and a stirring shaft is arranged on a cylinder of the coacervating device, the stirrer stator is installed in the cylinder, the stirrer rotor is located between the stirrer stators, and the stirrer rotor is connected with the stirring shaft. The stirring shaft is sleeved with a support piece, two ends of the support piece are respectively provided with a mechanical sealing piece, the mechanical sealing piece positioned outside the barrel is sleeved on the stirring shaft and connected with the barrel, and the mechanical sealing piece positioned in the barrel is connected with a stator seat of the stirrer. One end of the stirring shaft, which is positioned outside the cylinder body, is connected with a belt wheel of the power transmission device. The stirrer of the coagulation device has the advantages of large contact surface with materials, good stirring effect, more uniform material mixing and lower final water content, thereby reducing the washing time of the next procedure, effectively increasing the yield and saving the cost.
Disclosure of Invention
Aiming at the prior art, it can be seen how to design a coagulation washing device for producing Fluorinated Ethylene Propylene (FEP), which is an important way to ensure product stability, save energy, reduce human consumption and maintain safety by realizing automatic control of coagulation washing of fluorinated ethylene propylene, and is a problem that needs to be solved by those skilled in the art. Therefore, the invention provides a coagulation washing device for producing fluorinated ethylene propylene.
The invention aims to provide a coagulation washing device for producing polyperfluorinated ethylene propylene.
The second purpose of the invention is to provide a method for producing poly-perfluoroethylene propylene, condensing and washing.
The third purpose of the invention is to provide the application of the condensed washing device for producing the fluorinated ethylene propylene.
In order to realize the purpose, the invention discloses the following technical scheme:
firstly, the invention discloses a coagulation washing device for producing fluorinated ethylene propylene, which comprises: the device comprises a coagulation barrel, an intermediate tank, a constant-temperature water tank, a recovered water elevated tank, an outer drainage pool and a recovered water collecting pool, wherein the intermediate tank is connected with the upper end of the coagulation barrel, the constant-temperature water tank is communicated with the upper part of the coagulation barrel, and meanwhile, the constant-temperature water tank is also communicated with the bottom of the coagulation barrel; the bottom of the recycled water elevated tank is communicated with the bottom of the coagulation barrel, meanwhile, the top of the recycled water elevated tank is communicated with the recycled water collecting tank, and the outer drainage tank is communicated with the bottom of the coagulation barrel; meanwhile, the reclaimed water collecting tank is communicated with the bottom of the coagulation barrel.
Furthermore, a feeding quick-cutting valve is arranged on a communication line between the coagulation barrel and the intermediate tank, and one of the functions of the feeding quick-cutting valve is to quantitatively control the raw materials in the intermediate tank to enter the coagulation barrel, so that the feeding amount of the raw materials is more accurate, the feeding time is more accurate, and the problem of poor product quality stability caused by manual operation is solved.
Furthermore, a pure water quick-cutting valve is arranged on a communication line between the condensation barrel and the upper part of the constant-temperature water tank, and one function of the pure water quick-cutting valve is to quantitatively control the constant-temperature water tank to supplement pure water to the condensation barrel so as to meet the conditions required by condensation of the fluorinated ethylene propylene.
Furthermore, the condensation barrel is provided with a first liquid level meter, one of the functions of the first liquid level meter is to automatically monitor the liquid level height of the liquid in the condensation barrel and feed the liquid level height back to the control system in real time, so that the operations of regulating, supplementing, discharging and the like of the liquid in the condensation barrel are realized, and the reaction is ensured to be carried out.
Further, an agitator is arranged in the coagulation barrel, and one of the actions of the agitator is to accelerate the coagulation and washing process of the fluorinated ethylene propylene.
Further, be provided with first watering and cut the valve soon on the intercommunication line of condensation bucket and constant temperature basin bottom, the bottom of recovery water elevated tank and the intercommunication line of condensation bottom of the drum portion second watering and cut the valve soon, through the cooperation of first watering and cut the valve soon with the second watering and cut the valve soon, can realize the make full use of to pure water and recovery water, after the recovery water in the recovery water elevated tank falls to a certain degree, can launch first watering and cut the valve soon and introduce the condensation bucket with the pure water in the constant temperature basin, realize the make full use of to recovery water.
Further, a second liquid level meter and a third liquid level meter are respectively arranged on the constant-temperature water tank and the recycled water high-level tank; which are respectively used for monitoring the liquid level conditions in the constant-temperature water tank and the reclaimed water head tank.
Furthermore, a first water discharging quick-cutting valve is arranged on a communication line between the outer water discharging pool and the bottom of the condensation barrel, a second water discharging quick-cutting valve is arranged on a communication line between the recovered water collecting pool and the bottom of the condensation barrel, and classified recycling of water used in different washing processes can be realized through the arrangement of the first water discharging quick-cutting valve and the second water discharging quick-cutting valve.
Furthermore, a reclaimed water fast-switching valve is arranged on a communication line between the top of the reclaimed water head tank and the reclaimed water collecting tank, and when the reclaimed water level in the reclaimed water head tank reaches a set value, the reclaimed water head tank is replenished by the control of the reclaimed water fast-switching valve.
Further, the recovery water head tank still is provided with the overflow pipe, the one end and the recovery water head tank upper portion lateral wall intercommunication of overflow pipe, the other end and recovery water collecting pit intercommunication, the overflow pipe can make the recovery water collecting pit introduce when the water in the recovery water head tank surpasses the specified value, in time draws forth unnecessary water again to practice thrift the recovery water, guarantee the normal clear of recovery process.
Further, the fluorinated ethylene propylene production condensation washing device further comprises a discharging device, wherein the discharging device is communicated with the condensation barrel, and after condensation and the whole washing process are finished, the fluorinated ethylene propylene obtained by the condensation barrel is taken out through the discharging device.
Further, all be provided with filter equipment on the bottom of the condensation bucket and each communicating line of constant temperature basin, recovered water head tank, outer drainage pond and recovered water collecting pit, can enough prevent like this to introduce the condensation bucket with external impurity in, the poly perfluoroethylene propylene that will obtain when can prevent to discharge the water after the washing also discharges.
Furthermore, the device for producing, condensing and washing the fluorinated ethylene propylene further comprises a Distributed Control System (DCS), which is a multi-stage computer system consisting of a process control stage and a process monitoring stage and taking a communication network as a link, integrates 4C technologies such as computers, communication, display and control and the like, and can realize operations such as decentralized control, centralized operation, hierarchical management, flexible configuration, convenient configuration and the like. The characteristics of DCS can be utilized to realize the automatic control of the isolating quick-cutting valves on each part and pipeline.
Furthermore, each fast-switching valve can be a pneumatic valve which can receive signals sent by a DCS control system of the valve and automatically realize the opening and closing of the valve, so that the pneumatic valve can receive the signals at regular time according to the set process parameters in the DCS control system, the control of the valve on each communication line is automatically realized, and the automatic control of the process is realized.
Further, the communication lines can be communicated by pipelines, so that the condensation of the fluorinated ethylene propylene and the transfer operation of raw materials, water and the like in the washing process are met.
Further, the transfer of the recovered water from the recovered water collecting tank to the recovered water head tank can be realized by a water pump, and similarly, when the invention relates to other situations requiring liquid transfer, the transfer can also be realized by similar technical means, and a person skilled in the art can specifically select the transfer according to the needs, and the invention is not limited.
The invention further discloses a condensation washing method for producing the fluorinated ethylene propylene, which is carried out by means of the condensation washing device for producing the fluorinated ethylene propylene, and comprises the following steps:
(1) checking whether the liquid level of the condensation barrel reaches a set value, if the liquid level of the condensation barrel does not reach the set value, opening the pure water quick-cutting valve for supplying, and closing the pure water quick-cutting valve after the liquid level reaches the set value; if the liquid level exceeds the set value, the first water discharging quick-cutting valve is opened, and the first water discharging quick-cutting valve is closed after the liquid level reaches the set value;
(2) opening the discharging fast-cutting valve, and closing the discharging fast-cutting valve when the liquid level of the condensation barrel reaches a set value; starting an agglomeration program to carry out agglomeration; after the condensation is finished, opening a first water discharge quick-cut valve to discharge redundant reaction liquid, closing the first water discharge quick-cut valve when the liquid level in the condensation barrel reaches a set value, and entering a washing program;
(3) the washing is carried out at least four times, in particular as follows:
first washing and second washing: opening a second water adding fast-switching valve, introducing the recovered water in the recovered water high-level tank into the coagulation barrel, and closing the second water adding fast-switching valve when the liquid level of the coagulation barrel reaches a set value; then starting the stirrer for washing, settling after washing, opening a first water discharge quick-cutting valve to discharge the washing liquid after settling, and closing the first water discharge quick-cutting valve when the liquid level in the coagulation barrel reaches a set value; after the washing is finished, carrying out second washing, wherein the second washing is the same as the first washing;
third and fourth washing: opening a second water adding fast-switching valve, introducing the recovered water in the recovered water high-level tank into the coagulation barrel, and closing the second water adding fast-switching valve when the liquid level of the coagulation barrel reaches a set value; then starting the stirrer for washing, settling after washing, opening a second water discharge quick-cutting valve after settling, and closing the second water discharge quick-cutting valve when the liquid level in the coagulation barrel reaches a set value; thereby realizing the recovery of the washing liquid; and after the completion, performing a fourth washing, wherein the fourth washing is the same as the third washing program.
(4) After washing, the water sample in the condensation barrel is taken for detection, and the material can be discharged after all indexes are qualified.
In the step (3), in the first to fourth washing, when the liquid level in the condensate tank is not yet reached to the set value when the liquid level in the condensate tank is lowered to the set value during the introduction of the recovered water from the recovered water head tank into the condensate tank, the second water adding fast-switching valve can be closed, and the first water adding fast-switching valve is opened to supplement the pure water in the constant-temperature water tank into the condensate tank. Therefore, the utilization of the recovered water can be increased as much as possible, the requirement on water is large in the production of the fluorinated ethylene propylene, the waste of water resources is easily caused, and the recovered water and the unused pure water can be matched for use through the supplement design, so that the use of the pure water is reduced as much as possible.
In the step (4), the water sample detection is as follows: and (4) conducting conductivity test on the water sample, and if the conductivity is less than or equal to 3 mu s/cm, washing to be qualified.
Finally, the invention discloses application of the condensation washing device for producing the fluorinated ethylene propylene in the chemical field.
Compared with the prior art, the invention has the following beneficial effects:
(1) the device disclosed by the invention not only realizes the automatic production of the fluorinated ethylene propylene, ensures the stability of product quality, but also realizes energy conservation and water conservation. In addition, the problems that the labor intensity of operators is high, the operators are exposed in dangerous environments for a long time, and the like can be effectively solved.
(2) The device of the invention can transfer the liquid generated in the production according to the requirement through the matching of each pipeline, each switch and the stored device, thereby realizing the condensation and the washing of the fluorinated ethylene propylene in the same reaction device and greatly reducing the purchase and the installation of industrial equipment.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of a coagulation washing device for producing polyperfluorinated ethylene propylene in example 1 of the present invention.
FIG. 2 is a schematic structural diagram of a coagulation washing device for producing polyperfluorinated ethylene propylene in example 2 of the invention.
FIG. 3 is a schematic structural diagram of a coagulation washing device for producing polyperfluoroethylene propylene in example 3 of the present invention.
The scores in the figure represent: 1-a condensation barrel, 2-an intermediate tank, 3-a constant-temperature water tank, 4-a recycled water elevated tank, 5-an external drainage tank, 6-a recycled water collecting tank, 7-a discharging quick-cutting valve, 8-a pure water quick-cutting valve, 9-a first liquid level meter, 10-a stirrer, 11-a first water-adding quick-cutting valve, 12-a second water-adding quick-cutting valve, 13-a second liquid level meter, 14-a third liquid level meter, 15-a second water-discharging quick-cutting valve, 16-a recycled water quick-cutting valve, 17-an overflow pipe, 18-a discharging device, 19-a filtering device and 20-a first water-discharging quick-cutting valve.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, how to design a coagulation washing device for producing Fluorinated Ethylene Propylene (FEP) is an important way to ensure product stability, save energy, reduce labor and maintain safety by realizing automatic control of coagulation washing of fluorinated ethylene propylene, and is a problem to be solved by those skilled in the art. Therefore, the invention provides a coagulation washing device for producing fluorinated ethylene propylene; the invention will now be further described with reference to the accompanying drawings and detailed description.
Example 1
As shown in figure 1, a coagulation washing device for producing polyperfluorinated ethylene propylene comprises: the device comprises a coagulation barrel 1, an intermediate tank 2, a constant-temperature water tank 3, a reclaimed water elevated tank 4, an outer drainage pool 5 and a reclaimed water collecting pool 6, wherein the intermediate tank 2 is connected with the upper end of the coagulation barrel 1, the constant-temperature water tank 3 is communicated with the upper part of the coagulation barrel 1, and meanwhile, the constant-temperature water tank 3 is also communicated with the bottom of the coagulation barrel 1; the bottom of the recycled water elevated tank 4 is communicated with the bottom of the coagulation barrel 1, meanwhile, the top of the recycled water elevated tank 4 is communicated with a recycled water collecting tank 6, and the outer drainage tank 5 is communicated with the bottom of the coagulation barrel 1; meanwhile, the reclaimed water collecting tank 6 is communicated with the bottom of the coagulation barrel 1.
A feeding quick-cutting valve 7 is arranged on a communication line between the coagulation barrel 1 and the intermediate tank 2, and one of the functions of the feeding quick-cutting valve 7 is to quantitatively control the raw materials in the intermediate tank 2 to enter the coagulation barrel 1, so that the feeding amount of the raw materials is more accurate, the feeding time is more accurate, and the problem of poor product quality stability caused by manual operation is solved.
And a pure water quick-cutting valve 8 is arranged on a communication line between the upper parts of the condensation barrel 1 and the constant-temperature water tank 3, and one function of the pure water quick-cutting valve 8 is to quantitatively control the constant-temperature water tank 3 to supplement pure water to the condensation barrel 1 so as to meet the conditions required by condensation of fluorinated ethylene propylene.
Further, the condensation barrel 1 is provided with a first liquid level meter 9, one of the functions of the condensation barrel 1 is to automatically monitor the liquid level height of the liquid in the condensation barrel 1 and feed the liquid level height back to the control system in real time, so that the operations of regulating, supplementing, discharging and the like of the liquid in the condensation barrel 1 are realized, and the reaction is ensured to be carried out.
The coagulation barrel 1 is provided with a stirrer 10, and one of the functions of the stirrer 10 is to accelerate the coagulation and washing process of the fluorinated ethylene propylene.
It cuts valve 11 soon to be provided with first watering on the intercommunication line of condensation bucket 1 and constant temperature water tank 3 bottom, the bottom of recovery water elevated tank 4 and the intercommunication line of condensation bucket 1 bottom on the second valve 12 that cuts soon, through the cooperation of first watering cut valve 11 and the second valve 12 that cuts soon, can realize the make full use of pure water and recycled water, fall to after the certain degree when the recovery water in recovery water elevated tank 4, can launch first watering and cut the pure water introduction condensation bucket 1 of valve 11 in with constant temperature water tank 3 soon, realize the make full use of to the recycled water.
A second liquid level meter 13 and a third liquid level meter 14 are respectively arranged on the constant-temperature water tank 3 and the reclaimed water head tank 4; which are respectively used for monitoring the liquid level conditions in the constant temperature water tank 3 and the reclaimed water head tank 4.
A first water discharge quick-cutting valve 20 is arranged on a communication line between the outer water discharge tank 5 and the bottom of the condensation barrel 1, a second water discharge quick-cutting valve 15 is arranged on a communication line between the recovered water collection tank 6 and the bottom of the condensation barrel 1, and by means of the arrangement of the first water discharge quick-cutting valve 20 and the second water discharge quick-cutting valve 15, classified recycling of water used in different washing processes can be achieved, for example, in the former two times of washing, because the washed water contains a large amount of chemical raw materials, the utilization value of the water is low, if the water is recycled for the subsequent washing of the fluorinated ethylene propylene, the washing effect is poor, and the requirement cannot be met; therefore, the water after the first few times of washing is discharged to the outer water discharge tank 5 through the first water discharge quick-cut valve 20; and the water after the washing for a plurality of times is discharged into a reclaimed water collecting tank 6 and then introduced into a reclaimed water elevated tank 4, so that the high-efficiency utilization of the water is realized.
And a reclaimed water fast-switching valve 16 is arranged on a communication line between the top of the reclaimed water head tank 4 and the reclaimed water collecting tank 6, and when the reclaimed water level in the reclaimed water head tank 4 reaches a set value, the reclaimed water head tank 4 is supplemented by the control of the reclaimed water fast-switching valve 16.
Example 2
As shown in FIG. 2, a coagulation washing device for producing polyperfluorinated ethylene propylene is the same as that of example 1 except that: the recycled water elevated tank 4 is also provided with an overflow pipe 17, one end of the overflow pipe 17 is communicated with the side wall of the upper part of the recycled water elevated tank 4, the other end of the overflow pipe is communicated with the recycled water collecting tank 6, and when the overflow pipe 17 can lead the recycled water collecting tank 6 to introduce the water in the recycled water elevated tank 4 to exceed the specified value, redundant water is timely led out again to save the recycled water and ensure the normal operation of the recycling process.
Example 3
As shown in FIG. 3, a coagulation washing device for producing polyperfluorinated ethylene propylene is the same as that of example 2 except that: the fluorinated ethylene propylene production condensation washing device further comprises a discharging device 18, wherein the discharging device 18 is communicated with the condensation barrel 1, and after condensation and the whole washing process are finished, the fluorinated ethylene propylene obtained by the condensation barrel 1 is taken out through the discharging device.
All be provided with filter equipment 19 on 1 bottom of condensation bucket and constant temperature water tank 3, recovered water elevated tank 4, outer drainage pond 5 and the each communication line of recovered water collecting pit 6, can enough prevent like this to introduce in condensation bucket 1 with external impurity, can prevent again that the water after the washing of discharging will obtain when gathering perfluoroethylene propylene also discharges.
Example 4
A poly (perfluoroethylene-propylene) production condensation washing system is the same as the system in the embodiment 1, except that: the system also comprises a Distributed Control System (DCS), which is a multi-stage computer system consisting of a process control stage and a process monitoring stage and taking a communication network as a link, integrates 4C technologies such as computers, communication, display and control and the like, and can realize operations such as distributed control, centralized operation, hierarchical management, flexible configuration, convenient configuration and the like. The DCS has the characteristics that the automatic control of the isolating quick-cutting valves on all parts and pipelines is realized.
Each fast-cutting valve can be a pneumatic valve, the valves can receive signals sent by a DCS control system of the valves and automatically open and close the valves, and thus after technological parameters are set in the DCS control system, the pneumatic valves can receive the signals at regular time, the valves on each communication line are automatically controlled, and the automatic control of the technological process is realized.
Example 5
A poly (perfluoroethylene-propylene) production condensation washing device is the same as the device in the embodiment 1, except that: the communication line is communicated by pipelines, and the transfer of the recovered water from the recovered water collecting tank 6 to the recovered water head tank 4 can be realized by a water pump.
Example 6
A method for performing condensation washing of fluorinated ethylene propylene production by using the device of embodiment 4, comprising the following steps:
(1) checking whether the liquid level of the condensation barrel 1 reaches 30% of the volume of the condensation barrel 1, if the liquid level does not reach 30%, opening the pure water quick-cut valve 8 for supplying, and closing the pure water quick-cut valve 8 after the liquid level reaches 30%; if the liquid level exceeds 30%, the first water discharging quick-cut valve 20 is opened, and the first water discharging quick-cut valve 20 is closed after the liquid level reaches 30%;
(2) opening the discharging fast-cutting valve 7, and closing the discharging fast-cutting valve 7 when the liquid level of the coagulation barrel 1 reaches 43% of the volume of the coagulation barrel 1;
(3) starting an agglomeration program to carry out agglomeration: changing manual operation in a control program of the condensation barrel 1 into automatic operation on a DCS, clicking a start-to-empty button to start condensation, setting the condensation time to be 60min, and rotating speed to be 850 r/min; stirring is automatically stopped after 60 min. Settling for 5min after the coagulation is finished, opening the first water discharge quick-cut valve 20 to discharge redundant reaction liquid, closing the first water discharge quick-cut valve 20 when the liquid level in the coagulation barrel 1 is reduced to 9% of the volume of the coagulation barrel 1, and entering a washing procedure;
(4) the washing is carried out in four times, specifically as follows:
first washing and second washing: opening a second water adding fast-cutting valve 12, introducing the recovered water in the recovered water head tank 4 into the coagulation barrel 1 (when the liquid level in the recovered water head tank 4 is reduced to below 15% of the volume of the recovered water head tank 4, if the liquid level in the coagulation barrel 1 does not reach 49% of the volume of the coagulation barrel 1, the second water adding fast-cutting valve 12 can be closed, the first water adding fast-cutting valve 11 is opened, and the pure water in the constant-temperature water tank 3 is supplemented into the coagulation barrel 1), and when the liquid level of the coagulation barrel 1 reaches 49%, the second water adding fast-cutting valve 12 is closed; after delaying for 3 seconds, starting the stirrer 10 for washing (rotating speed is 780 rpm, washing time is set as 8min), settling for 5min after washing is finished, opening the first water discharging fast-cutting valve 20 to discharge the washing liquid after settling is finished, and closing the first water discharging fast-cutting valve 20 when the liquid level in the condensation barrel 1 is reduced to 9% of the volume of the condensation barrel 1; after the washing is finished, carrying out second washing, wherein the second washing is the same as the first washing;
third and fourth washing: opening a second water adding fast-switching valve 12, introducing the recovered water in the recovered water high-level tank 4 into the coagulation barrel 1, and closing the second water adding fast-switching valve 12 when the liquid level of the coagulation barrel 1 reaches 49% of the volume of the coagulation barrel 1; when the liquid level of the condensation barrel 1 reaches 49%, closing the second water adding quick-cut valve 12; after delaying for 3 seconds, starting the stirrer 10 for washing (rotating speed is 780 rpm, washing time is set as 8min), settling for 5min after washing is finished, opening the second water discharging quick-cutting valve 15 after settling is finished, and closing the second water discharging quick-cutting valve 15 when the liquid level in the coagulation barrel 1 is reduced to 9% of the volume of the coagulation barrel 1; thereby realizing the recovery of the washing liquid; after completion, a fourth wash is performed, which is the same as the third wash procedure except that: after the sedimentation is finished, opening a second water discharging fast-cutting valve 15 to drain the liquid in the condensation barrel 1;
(5) and after washing is finished, taking a water sample from the condensation barrel 1 for conductivity test, and if the conductivity is less than or equal to 3 mu s/cm, washing to be qualified.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A device for producing, condensing and washing polyfluorinated ethylene propylene is characterized by comprising: the device comprises a condensation barrel, an intermediate tank, a constant-temperature water tank, a recovered water elevated tank, an external drainage pool and a recovered water collecting pool;
the middle tank is connected with the upper end of the condensation barrel, the constant-temperature water tank is communicated with the upper part of the condensation barrel, and meanwhile, the constant-temperature water tank is also communicated with the bottom of the condensation barrel; the bottom of the recycled water elevated tank is communicated with the bottom of the coagulation barrel, meanwhile, the top of the recycled water elevated tank is communicated with the recycled water collecting tank, and the outer drainage tank is communicated with the bottom of the coagulation barrel; meanwhile, the reclaimed water collecting tank is communicated with the bottom of the coagulation barrel;
a discharge quick-cutting valve is arranged on a communication line between the coagulation barrel and the intermediate tank;
a pure water quick-cutting valve is arranged on a communication line between the upper parts of the condensation barrel and the constant-temperature water tank;
a first liquid level meter is arranged on the condensation barrel, and a second liquid level meter and a third liquid level meter are respectively arranged on the constant-temperature water tank and the recycled water high-level tank;
a first water adding quick-cutting valve is arranged on a communication line between the bottom of the condensation barrel and the bottom of the constant-temperature water tank, and a second water adding quick-cutting valve is arranged on a communication line between the bottom of the recovered water elevated tank and the bottom of the condensation barrel;
a first water discharge quick-switching valve is arranged on a communication line between the outer drainage pool and the bottom of the condensation barrel, and a second water discharge quick-switching valve is arranged on a communication line between the recovered water collection pool and the bottom of the condensation barrel;
and a reclaimed water fast-cutting valve is arranged on a communication line between the top of the reclaimed water elevated tank and the reclaimed water collecting tank.
2. A coagulation washing apparatus for production of polyperfluoroethylpropylene according to claim 1, wherein an agitator is provided in the coagulation tank.
3. The apparatus for condensation washing in production of fluorinated ethylene propylene according to claim 1, wherein the high level tank for recovered water is further provided with an overflow pipe, one end of the overflow pipe is communicated with the upper side wall of the high level tank for recovered water, and the other end of the overflow pipe is communicated with the collected water collecting tank.
4. The apparatus for condensation washing in production of fluorinated ethylene propylene according to claim 1, further comprising a discharge means, wherein said discharge means is in communication with the condensation barrel.
5. The apparatus for washing and condensing production of fluorinated ethylene propylene according to claim 1, wherein a filtering device is disposed on each of the communication lines between the bottom of the condensing barrel and the constant temperature water tank, the recovered water head tank, the outer drainage tank and the recovered water collecting tank.
6. A poly (perfluoroethylene propylene) production condensate scrubbing apparatus as claimed in claim 1, wherein said fast-cut valves comprise pneumatic valves; or the communication lines are communicated by pipelines.
7. A fluorinated ethylene propylene production coagulation washing system, characterized by comprising the fluorinated ethylene propylene production coagulation washing device according to claim 6, and a distributed control system capable of controlling a pneumatic valve through signal transmission.
8. A method for coagulation washing of production of perfluoroethylene propylene by using the coagulation washing device according to any one of claims 1 to 6 or the coagulation washing system according to claim 7, characterized by comprising the steps of:
(1) checking whether the liquid level of the condensation barrel reaches a set value, if the liquid level of the condensation barrel does not reach the set value, opening the pure water quick-cutting valve for supplying, and closing the pure water quick-cutting valve after the liquid level reaches the set value; if the liquid level exceeds the set value, the first water discharging quick-cutting valve is opened, and the first water discharging quick-cutting valve is closed after the liquid level reaches the set value;
(2) opening the discharging fast-cutting valve, and closing the discharging fast-cutting valve when the liquid level of the condensation barrel reaches a set value; starting an agglomeration program to carry out agglomeration; after the condensation is finished, opening a first water discharge quick-cut valve to discharge redundant reaction liquid, closing the first water discharge quick-cut valve when the liquid level in the condensation barrel reaches a set value, and entering a washing program;
(3) the washing is carried out at least four times, in particular as follows:
first washing and second washing: opening a second water adding fast-switching valve, introducing the recovered water in the recovered water high-level tank into the coagulation barrel, and closing the second water adding fast-switching valve when the liquid level of the coagulation barrel reaches a set value; then starting the stirrer for washing, settling after washing, opening a first water discharge quick-cutting valve to discharge the washing liquid after settling, and closing the first water discharge quick-cutting valve when the liquid level in the coagulation barrel reaches a set value; after the washing is finished, carrying out second washing, wherein the second washing is the same as the first washing;
third and fourth washing: opening a second water adding fast-switching valve, introducing the recovered water in the recovered water high-level tank into the coagulation barrel, and closing the second water adding fast-switching valve when the liquid level of the coagulation barrel reaches a set value; then starting the stirrer for washing, settling after washing, opening a second water discharge quick-cutting valve after settling, and closing the second water discharge quick-cutting valve when the liquid level in the coagulation barrel reaches a set value; thereby realizing the recovery of the washing liquid; after the washing is finished, carrying out a fourth washing, wherein the fourth washing is the same as the third washing program;
(4) after washing, the water sample in the condensation barrel is taken for detection, and the material can be discharged after all indexes are qualified.
9. The method according to claim 8, wherein in the step (3), when the liquid level in the coagulation bucket is not reached to the set value when the liquid level in the reclaimed water head tank drops to the set value in the reclaimed water introduced from the reclaimed water head tank into the coagulation bucket in the first to fourth washes, the second water adding quick-cut valve is closed, and the first water adding quick-cut valve is opened to replenish the pure water in the constant-temperature water tank into the coagulation bucket.
10. The method of claim 8, wherein in step (4), the water sample detection is: and (4) conducting conductivity test on the water sample, and if the conductivity is less than or equal to 3 mu s/cm, washing to be qualified.
11. Use of a coagulation washing device according to any one of claims 1 to 6 and/or a coagulation washing system according to claim 7 in the chemical industry.
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| CN201910137859.XA CN110016098B (en) | 2019-02-25 | 2019-02-25 | Poly (perfluoroethylene-propylene) production condensation washing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| USH1055H (en) * | 1990-05-29 | 1992-05-05 | Atochem North America, Inc. | Thermal energy coagulation and washing of latex particles |
| ITMI20011613A1 (en) * | 2001-07-26 | 2003-01-26 | Ausimont Spa | COAGULATION PROCESS OF FINE PTFE POWDERS |
| WO2007123123A1 (en) * | 2006-04-18 | 2007-11-01 | Daikin Industries, Ltd. | Method for producing fluorine rubber |
| CN100488989C (en) * | 2006-12-30 | 2009-05-20 | 山东东岳神舟新材料有限公司 | Agglomeration washing method of fluorinated ethylene propylene |
| CN201132823Y (en) * | 2007-11-20 | 2008-10-15 | 山东东岳神舟新材料有限公司 | Device for agglomerating novel fluorinated ethylenepropylene copolymer resin |
| CN102443091B (en) * | 2011-10-25 | 2013-07-24 | 中昊晨光化工研究院 | Condensation washing method for fluorinated ethylene-propylene resin |
| CN102698462A (en) * | 2012-06-29 | 2012-10-03 | 怀化市骏源精细化工有限公司 | Acid mist condensing water-saving method of reaction kettle for producing aluminum polychlorid and system thereof |
| CN102875711B (en) * | 2012-09-20 | 2014-05-14 | 中昊晨光化工研究院有限公司 | Condensing washing method of polyvinylidene fluoride emulsion |
| CN103694065B (en) * | 2013-11-11 | 2016-07-06 | 西安近代化学研究所 | A kind of miniature ball wash mill and method |
| CN103724658B (en) * | 2013-12-09 | 2016-09-14 | 上海三爱富新材料股份有限公司 | The recovery method of perfluoroethylene-propylene and device for the method |
| CN106317265B (en) * | 2015-06-26 | 2018-09-11 | 中昊晨光化工研究院有限公司 | A kind of condensing method of polytetrafluoroethyldispersion dispersion resin |
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