CN117019042A - Detection device and detection method for polyacrylonitrile solution polymerization - Google Patents
Detection device and detection method for polyacrylonitrile solution polymerization Download PDFInfo
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- CN117019042A CN117019042A CN202311287700.9A CN202311287700A CN117019042A CN 117019042 A CN117019042 A CN 117019042A CN 202311287700 A CN202311287700 A CN 202311287700A CN 117019042 A CN117019042 A CN 117019042A
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- reaction kettle
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- 238000001514 detection method Methods 0.000 title claims abstract description 50
- 229920002239 polyacrylonitrile Polymers 0.000 title claims abstract description 38
- 238000010528 free radical solution polymerization reaction Methods 0.000 title claims abstract description 23
- 238000003756 stirring Methods 0.000 claims abstract description 138
- 238000006243 chemical reaction Methods 0.000 claims abstract description 74
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 20
- 230000003197 catalytic effect Effects 0.000 claims description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000001914 filtration Methods 0.000 claims description 17
- 239000003054 catalyst Substances 0.000 claims description 16
- 238000004140 cleaning Methods 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 239000013013 elastic material Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 230000000379 polymerizing effect Effects 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 abstract description 9
- 229920000049 Carbon (fiber) Polymers 0.000 description 3
- 239000004917 carbon fiber Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007790 scraping Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000010526 radical polymerization reaction Methods 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010539 anionic addition polymerization reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 238000012718 coordination polymerization Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012673 precipitation polymerization Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010557 suspension polymerization reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- 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
- C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/42—Nitriles
- C08F20/44—Acrylonitrile
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/0013—Controlling the temperature of the process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
- B01J19/0066—Stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
-
- C—CHEMISTRY; METALLURGY
- 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
- C08F2/00—Processes of polymerisation
- C08F2/01—Processes of polymerisation characterised by special features of the polymerisation apparatus used
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention provides a detection device and a detection method for polyacrylonitrile solution polymerization, wherein a temperature detection module is used for detecting the temperature in a reaction kettle, so that the phenomenon of uneven heat dissipation due to excessive heat dissipation during continuous polymerization is avoided, and the temperature in the reaction kettle is ensured to be within a preset temperature range. Meanwhile, the stirring mechanism is arranged, the stirring assembly is driven to lift through the lifting block, on one hand, the solution at each height in the solution is fully stirred, on the other hand, the solution is subjected to axial driving force through the lifting of the stirring assembly, and then the solutions at different heights are mutually mixed, so that the solution is fully stirred.
Description
Technical Field
The invention relates to the field of detection, in particular to a detection device and a detection method for polyacrylonitrile solution polymerization.
Background
Carbon fibers have excellent characteristics of high specific modulus, high specific strength, high temperature resistance, corrosion resistance and the like, and have been widely used in various fields. The polyacrylonitrile-based carbon fiber is prepared by spinning a polymer with acrylonitrile as a main molecular chain structural unit and carbonizing the polymer at a high temperature.
The polyacrylonitrile solution used for preparing the polyacrylonitrile-based carbon fiber spinning solution can be divided into free radical polymerization, anion polymerization, coordination polymerization and the like according to the reaction mechanism. Currently, free radical polymerization is the most widely used, and methods for its implementation include solution polymerization, suspension polymerization, and aqueous precipitation polymerization.
In the prior art, when the polyacrylonitrile solution is prepared, a reaction kettle is filled with materials, then hot water is introduced to rapidly heat the polymerization reaction kettle, so that the temperature in the polymerization reaction kettle reaches and stabilizes at the process temperature as quickly as possible, when the conversion rate of the polymerization solution reaches the process value, the materials are continuously fed into the polymerization reaction kettle and stirred, meanwhile, the polymerization solution is discharged, the balance of a polymerization reaction system is maintained, continuous polymerization is realized, and the phenomenon of excessively rapid heat dissipation of heat release easily occurs during continuous polymerization, so that the temperature in the reaction kettle is higher than the process temperature, and the reaction is abnormal.
The above problems are currently in need of solution.
Disclosure of Invention
The invention aims to provide a detection device and a detection method for polyacrylonitrile solution polymerization.
In order to solve the technical problems, the present invention provides a detection device for polyacrylonitrile solution polymerization, comprising: the device comprises a control module, a temperature detection module, a water bath heating module and a reaction kettle;
the control module is suitable for controlling the water bath heating module to heat the reaction kettle;
the reaction kettle is suitable for polymerizing the polyacrylonitrile solution;
the temperature detection module is suitable for detecting the temperature in the reaction kettle and sending the detected temperature information to the control module;
the control module is suitable for adjusting the water temperature of the water bath heating module according to the detected temperature information, so that the temperature in the reaction kettle is stabilized in a preset temperature range.
Further, the control module is suitable for controlling the water bath heating module to heat water when the received temperature information is smaller than the middle value of the preset temperature range;
and the control module is suitable for controlling the water bath heating module to inject cold water for cooling when the received temperature information is larger than the intermediate value of the preset temperature range.
Further, a stirring mechanism is arranged in the reaction kettle and is suitable for stirring and mixing the solution in the reaction kettle;
the stirring mechanism comprises: stirring shaft, stirring assembly and lifting block;
the stirring shaft is provided with a chute suitable for the stirring assembly to slide;
the lifting block is in threaded connection with the stirring shaft and is suitable for being connected to the inner wall of the reaction kettle in a sliding manner through a connecting rod;
the bottom of the lifting block is rotationally connected to the stirring assembly;
the stirring shaft is suitable for driving the lifting block and the stirring assembly to lift when rotating, and simultaneously driving the stirring assembly to rotate, so that the solution in the reaction kettle is stirred and mixed.
Further, the stirring assembly comprises a stirring fan and a catalytic disc;
the stirring shaft is rotatably arranged in the reaction kettle;
the stirring fan and the catalytic disc are sleeved outside the stirring shaft;
the catalytic disc is rotationally connected to the bottom of the lifting block;
the stirring fan is connected to the chute of the stirring shaft in a sliding manner;
a catalytic disc and a plurality of sliding rods are arranged in the catalytic disc;
the catalytic plate is suitable for being fixedly connected with the stirring fan through a plurality of sliding rods;
the catalytic disc is connected to the sliding rods in a sliding manner;
the catalyst disc is provided with a catalyst;
when the stirring fan descends to be propped against the bottom of the reaction kettle along with the lifting block, the catalytic disc continuously descends along the sliding rod, and the catalytic disc is suitable for extruding the catalyst on the catalytic disc.
Further, the catalytic disc comprises a first disc, a second disc and an annular side wall;
the first disc and the second disc are arranged opposite to each other;
the annular side wall is fixedly connected to the first disc and the second disc;
the catalytic disc is arranged between the first disc and the second disc;
and the second disc is provided with a through hole which is suitable for the sliding rod to pass through.
Further, a plurality of first filtering holes are formed in the top of the first disc;
the annular side wall is provided with a plurality of second filtering holes;
the first filtering holes and the second filtering holes are covered with solid-liquid separation films;
when the catalytic disc rises, the solution enters the catalytic disc from the first filtering holes and flows out from the second filtering holes;
when the catalytic disc descends, the solution enters the catalytic disc from the second filtering holes and flows out from the first filtering holes.
Further, the stirring fan comprises a first stirring blade and a second stirring blade;
the first stirring blade and the second stirring blade form a stirring fan after being surrounded;
the number of the sliding grooves is two;
the two sliding grooves are oppositely arranged on the side wall of the stirring shaft;
the first stirring blade and the second stirring blade are respectively provided with a sliding block which is in sliding connection with the corresponding sliding groove;
the bottoms of the first stirring blades and the second stirring blades are provided with soft cleaning blocks;
the soft cleaning block is suitable for cleaning the bottom of the reaction kettle when the first stirring blade and the second stirring blade are in contact with the bottom of the reaction kettle.
Further, the detection device for polyacrylonitrile solution polymerization further comprises a filtering component;
the filter component is rotationally connected to the top of the lifting block and is connected to the chute in a sliding manner;
the stirring shaft is further adapted to drive the filter assembly to rotate when rotating.
Further, the filter assembly comprises a shaft sleeve, a connecting plate and a filter plate;
the shaft sleeve is rotationally connected to the top of the lifting block and is connected to the sliding chute in a sliding manner;
one end of the connecting plate is fixedly arranged on the side wall of the shaft sleeve, and the other end of the connecting plate is close to the inner wall of the reaction kettle;
the filter plate is fixedly arranged on the connecting plate and is close to the inner wall of the reaction kettle.
Further, two sides of the filter plate are provided with storage plates;
the storage plate is fixedly arranged on the connecting plate;
the filter is the arc, the bottom of arc is fixed to be set up on the connecting plate, wherein, the filter is made by elastic material.
Further, the detection device for polyacrylonitrile solution polymerization further comprises a shoveling plate fixedly arranged at the upper part of the inner wall of the reaction kettle;
the filter plate is adapted to scoop solution impurities from the filter plate when the filter plate is rotated into contact with the scooping plate.
The invention also provides a preparation method of the detection device for polyacrylonitrile solution polymerization, which comprises the following steps:
pouring the solution into the reaction kettle;
and controlling the stirring shaft to rotate so as to drive the stirring assembly to move up and down, and stirring and mixing the ion fusion in the reaction kettle.
The invention has the beneficial effects that the detection device and the detection method for the polyacrylonitrile solution polymerization are provided, the temperature in the reaction kettle is detected through the temperature detection module, the detected temperature information is sent to the control module, and the control module is suitable for adjusting the water temperature of the water bath heating module according to the detected temperature information, so that the temperature in the reaction kettle is stabilized in a preset temperature range. The phenomenon of uneven heat dissipation caused by excessive heat dissipation caused by easy occurrence of heat dissipation during continuous polymerization is avoided, so that the temperature in the reaction kettle is ensured to be within a preset temperature range. The stirring assembly is driven to lift through the lifting block, so that on one hand, the solution at each height in the solution is fully stirred, and on the other hand, the solution is subjected to axial driving force through the lifting of the stirring assembly, and then the solutions at different heights are mutually mixed, so that the solution is fully stirred.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic block diagram of a detection device for polyacrylonitrile solution polymerization.
Fig. 2 is a cross-sectional view of the detection device for polyacrylonitrile solution polymerization provided by the invention.
Fig. 3 is an enlarged view at a in fig. 2.
Fig. 4 is an exploded view of the stirring mechanism provided by the invention.
Fig. 5 is a schematic structural view of a stirring fan and a stirring shaft provided by the invention.
Fig. 6 is a cross-sectional view of another view of the detection device for polyacrylonitrile solution polymerization provided by the invention.
In the figure: 110. a reaction kettle; 120. a stirring mechanism; 121. a stirring shaft; 1211. a chute; 122. a stirring assembly; 1221. a stirring fan; 1221a, a first stirring blade; 1221b, a second stirring blade; 1221c, a soft cleaning block; 1222. a catalytic disc; 1222a, catalytic disk; 1222b, sliding bar; 1222c, a first disc; 1222c1, a first filter hole; 1222d, a second disc; 1222e, annular sidewall; 1222e1, a second filter aperture; 123. a lifting block; 1231. a connecting rod; 130. a filter assembly; 131. a shaft sleeve; 132. a connecting plate; 133. a filter plate; 134. a storage plate; 140. the plate is removed.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only the structures which are relevant to the invention.
Embodiment 1 referring to fig. 1 to 6, embodiment 1 provides a detection device for polyacrylonitrile solution polymerization, comprising: the device comprises a control module, a temperature detection module, a water bath heating module and a reaction kettle; the control module is suitable for controlling the water bath heating module to heat the reaction kettle; the reaction kettle is suitable for polymerizing the polyacrylonitrile solution; the temperature detection module is suitable for detecting the temperature in the reaction kettle and sending the detected temperature information to the control module; the control module is suitable for adjusting the water temperature of the water bath heating module according to the detected temperature information, so that the temperature in the reaction kettle is stabilized in a preset temperature range. Specifically, the control module is suitable for controlling the water bath heating module to heat water when the received temperature information is smaller than the middle value of the preset temperature range; and the control module is suitable for controlling the water bath heating module to inject cold water for cooling when the received temperature information is larger than the intermediate value of the preset temperature range.
Wherein the intermediate value is half of the sum of the highest temperature and the lowest temperature of the preset temperature range.
In this embodiment, a stirring mechanism 120 is disposed in the reaction kettle 110; the stirring mechanism 120 is disposed in the reaction kettle 110 and is adapted to stir and mix the solution in the reaction kettle 110; the stirring mechanism 120 includes: stirring shaft 121, stirring assembly 122, and lifting block 123; the stirring shaft 121 is provided with a sliding groove 1211 suitable for sliding the stirring assembly 122; the lifting block 123 is in threaded connection with the stirring shaft 121 and is suitable for being in sliding connection with the inner wall of the reaction kettle 110 through a connecting rod 1231; the bottom of the lifting block 123 is rotatably connected to the stirring assembly 122; the stirring shaft 121 is adapted to drive the lifting block 123 and the stirring assembly 122 to lift when rotating, and simultaneously drive the stirring assembly 122 to rotate, so as to stir and mix the solution in the reaction kettle 110. The stirring assembly 122 is driven to lift through the lifting block 123, on one hand, the solution at each height in the solution is fully stirred, and on the other hand, the solution is subjected to axial driving force through the lifting of the stirring assembly 122, so that the solutions at different heights are mutually mixed, and the solution is fully stirred.
In this embodiment, the stirring assembly 122 includes a stirring fan 1221 and a catalytic disk 1222; the stirring shaft 121 is rotatably arranged in the reaction kettle 110; the stirring fan 1221 and the catalytic disc 1222 are sleeved outside the stirring shaft 121; the catalytic disc 1222 is rotatably connected to the bottom of the lifting block 123; the stirring fan 1221 is connected to the chute 1211 of the stirring shaft 121 in a sliding manner; the catalytic disk 1222 has a catalytic disk 1222a and a plurality of sliding rods 1222b disposed therein; the catalytic tray 1222a is adapted to be fixedly connected to the stirring fan 1221 by a plurality of the slide bars 1222b; the catalytic disk 1222 is slidably coupled to a plurality of the sliding bars 1222b; the catalyst tray 1222a is provided with a catalyst; the stirring fan 1221 is adapted to move down along the sliding rod 1222b when the stirring fan 1222 is moved down to abut against the bottom of the reaction kettle 110 along with the lifting block 123, and the catalytic disc 1222 is adapted to press the catalyst on the catalytic disc 1222 a. By arranging the sliding rod 1222b between the stirring fan 1221 and the catalytic disc 1222, the catalytic disc 1222 can continuously move downwards along the sliding rod 1222b when the stirring fan 1221 contacts with the bottom of the reaction kettle 110, so as to squeeze the catalyst in the catalytic disc 1222, so that the catalyst is fully contacted with the solution, and the catalytic effect is improved.
Wherein the catalytic disk 1222 includes a first disk 1222c, a second disk 1222d, and an annular sidewall 1222e; the first disk 1222c is disposed opposite the second disk 1222 d; the annular sidewall 1222e is fixedly connected to the first and second disks 1222c, 1222 d; the catalyst plate 1222a is disposed between the first and second disks 1222c and 1222 d; the second disk 1222d is provided with a via hole adapted for the sliding bar 1222b to pass through.
In this embodiment, a plurality of first filter holes 1222c1 are formed on the top of the first disc 1222 c; the annular sidewall 1222e has a plurality of second filter holes 1222e1; the first filter holes 1222c1 and the second filter holes 1222e1 are each covered with a solid-liquid separation membrane; as the catalytic disk 1222 rises, solution enters the catalytic disk 1222 from the first filter hole 1222c1 and flows out of the second filter hole 1222e1; as the catalytic disk 1222 descends, solution enters the catalytic disk 1222 from the second filter hole 1222e1, and flows out of the first filter hole 1222c 1. By providing the first filter holes 1222c1 and the second filter holes 1222e1, when the catalytic disc 1222 is lifted up and down along with the lifting block 123, the solution can enter the catalytic disc 1222 to be fully contacted with the catalyst, the solid-liquid separation membrane only allows the liquid to flow through, the impurities in the solution can not enter the catalyst to pollute the catalyst, and the catalyst on the catalytic disc 1222a can not enter the solution.
In the present embodiment, the stirring fan 1221 includes a first stirring blade 1221a and a second stirring blade 1221b; the first stirring blade 1221a and the second stirring blade 1221 are enclosed to form a stirring fan 1221; the number of the sliding grooves 1211 is two; the two sliding grooves 1211 are oppositely arranged on the side wall of the stirring shaft 121; the first stirring blade 1221a and the second stirring blade 1221b are respectively provided with a sliding block which is in sliding connection with the corresponding sliding groove 1211, and the bottoms of the first stirring blade and the second stirring blade are respectively provided with a soft cleaning block 1221c; the soft cleaning block 1221c is adapted to clean the bottom of the reaction vessel when the first stirring blade and the second stirring blade contact the bottom of the reaction vessel. When the stirrer is mounted, the first stirring blade 1221a and the second stirring blade 1221b are engaged with the stirring shaft 121, and then the engaged surfaces of the first stirring blade 1221a and the second stirring blade 1221b are fixed by bolts.
In this embodiment, the detection device for polyacrylonitrile solution polymerization further includes a filter assembly 130; the filter assembly 130 is rotatably connected to the top of the lifting block 123 and slidably connected to the chute 1211; the stirring shaft 121 is further adapted to rotate the filter assembly 130 when rotated.
Specifically, the filter assembly 130 includes a sleeve 131, a connection plate 132, and a filter plate 133; the shaft sleeve 131 is rotatably connected to the top of the lifting block 123 and is slidably connected to the chute 1211; one end of the connecting plate 132 is fixedly arranged on the side wall of the shaft sleeve 131, and the other end is close to the inner wall of the reaction kettle 110; the filter plate 133 is fixedly disposed on the connection plate 132 and is disposed near the inner wall of the reaction kettle 110.
Wherein, the two sides of the filter plate 133 are provided with a storage plate 134; the storage plate 134 is fixedly arranged on the connecting plate 132; the filter plate 133 is an arc plate, and the bottom of the arc plate is fixedly arranged on the connecting plate 132, wherein the filter plate 133 is made of an elastic material. The filter plate 133 rotates in the reaction kettle 110 under the driving of the stirring shaft 121 to collect impurities in the solution, and the stirring assembly 122 drives the solution to rotate when rotating to throw the impurities to the vicinity of the inner wall of the reaction kettle 110, so that the impurities are collected by the filter plate 133.
In this embodiment, the detection device for polyacrylonitrile solution polymerization further includes a scraping plate 140 fixedly disposed at an upper portion of an inner wall of the reaction kettle 110; the filter plate 133 is adapted to scoop solution impurities from the filter plate 133 when the filter plate 133 is rotated into contact with the scooping plate 140. Because the filter plate 133 is a flexible material, the scraping plate 140 may scrape the filter plate 133 when the filter plate 133 contacts, thereby completely scraping the impurities collected on the filter plate 133, and at the same time, not interfering with the rotation of the filter plate 133.
It should be noted that, the highest height of the lifting block 123 is not higher than the bottom of the removing plate 140, and cannot interfere with the operation of the filter assembly 130.
The invention also provides a detection method adopting the detection device for polyacrylonitrile solution polymerization, which comprises the following steps: inputting the solution into a reaction kettle; controlling a temperature detection module to detect the temperature of the reaction kettle; the control module controls the water bath heating module to adjust the temperature of the reaction kettle according to the detection result of the temperature detection module.
In summary, the invention provides a detection device and a detection method for polyacrylonitrile solution polymerization, which detect the temperature in a reaction kettle through a temperature detection module and send detected temperature information to a control module, wherein the control module is suitable for adjusting the water temperature of a water bath heating module according to the detected temperature information, so that the temperature in the reaction kettle is stabilized in a preset temperature range. The phenomenon of uneven heat dissipation caused by excessive heat dissipation caused by easy occurrence of heat dissipation during continuous polymerization is avoided, so that the temperature in the reaction kettle is ensured to be within a preset temperature range. The stirring assembly is driven to lift through the lifting block, so that on one hand, the solution at each height in the solution is fully stirred, and on the other hand, the solution is subjected to axial driving force through the lifting of the stirring assembly, and then the solutions at different heights are mutually mixed, so that the solution is fully stirred.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (11)
1. A detection device for polyacrylonitrile solution polymerization, characterized by comprising:
the device comprises a control module, a temperature detection module, a water bath heating module and a reaction kettle;
the control module is suitable for controlling the water bath heating module to heat the reaction kettle;
the reaction kettle is suitable for polymerizing the polyacrylonitrile solution;
the temperature detection module is suitable for detecting the temperature in the reaction kettle and sending the detected temperature information to the control module;
the control module is suitable for adjusting the water temperature of the water bath heating module according to the detected temperature information, so that the temperature in the reaction kettle is stabilized in a preset temperature range;
a stirring mechanism is arranged in the reaction kettle and is suitable for stirring and mixing the solution in the reaction kettle;
the stirring mechanism comprises: stirring shaft, stirring assembly and lifting block;
the stirring shaft is provided with a chute suitable for the stirring assembly to slide;
the lifting block is in threaded connection with the stirring shaft and is suitable for being connected to the inner wall of the reaction kettle in a sliding manner through a connecting rod;
the bottom of the lifting block is rotationally connected to the stirring assembly;
the stirring shaft is suitable for driving the lifting block and the stirring assembly to lift when rotating, and simultaneously driving the stirring assembly to rotate, so that the solution in the reaction kettle is stirred and mixed.
2. The apparatus for detecting polymerization of a polyacrylonitrile solution according to claim 1, wherein,
the control module is suitable for controlling the water bath heating module to heat water when the received temperature information is smaller than the intermediate value of the preset temperature range;
and the control module is suitable for controlling the water bath heating module to inject cold water for cooling when the received temperature information is larger than the intermediate value of the preset temperature range.
3. The apparatus for detecting polymerization of a polyacrylonitrile solution according to claim 1, wherein,
the stirring assembly comprises a stirring fan and a catalytic disc;
the stirring shaft is rotatably arranged in the reaction kettle;
the stirring fan and the catalytic disc are sleeved outside the stirring shaft;
the catalytic disc is rotationally connected to the bottom of the lifting block;
the stirring fan is connected to the chute of the stirring shaft in a sliding manner;
a catalytic disc and a plurality of sliding rods are arranged in the catalytic disc;
the catalytic plate is suitable for being fixedly connected with the stirring fan through a plurality of sliding rods;
the catalytic disc is connected to the sliding rods in a sliding manner;
the catalyst disc is provided with a catalyst;
when the stirring fan descends to be propped against the bottom of the reaction kettle along with the lifting block, the catalytic disc continuously descends along the sliding rod, and the catalytic disc is suitable for extruding the catalyst on the catalytic disc.
4. The detection device for polymerization of a polyacrylonitrile solution according to claim 3,
the catalytic disc comprises a first disc, a second disc and an annular side wall;
the first disc and the second disc are arranged opposite to each other;
the annular side wall is fixedly connected to the first disc and the second disc;
the catalytic disc is arranged between the first disc and the second disc;
and the second disc is provided with a through hole which is suitable for the sliding rod to pass through.
5. The detection device for polymerization of a polyacrylonitrile solution according to claim 4, wherein,
a plurality of first filter holes are formed in the top of the first disc;
the annular side wall is provided with a plurality of second filtering holes;
the first filtering holes and the second filtering holes are covered with solid-liquid separation films;
when the catalytic disc rises, the solution enters the catalytic disc from the first filtering holes and flows out from the second filtering holes;
when the catalytic disc descends, the solution enters the catalytic disc from the second filtering holes and flows out from the first filtering holes.
6. The detection device for polymerization of a polyacrylonitrile solution according to claim 3,
the stirring fan comprises a first stirring blade and a second stirring blade;
the first stirring blade and the second stirring blade form a stirring fan after being surrounded;
the number of the sliding grooves is two;
the two sliding grooves are oppositely arranged on the side wall of the stirring shaft;
the first stirring blade and the second stirring blade are respectively provided with a sliding block which is in sliding connection with the corresponding sliding groove;
the bottoms of the first stirring blades and the second stirring blades are provided with soft cleaning blocks;
the soft cleaning block is suitable for cleaning the bottom of the reaction kettle when the first stirring blade and the second stirring blade are in contact with the bottom of the reaction kettle.
7. The apparatus for detecting polymerization of a polyacrylonitrile solution according to claim 1, wherein,
the detection device for polyacrylonitrile solution polymerization further comprises a filtering component;
the filter component is rotationally connected to the top of the lifting block and is connected to the chute in a sliding manner;
the stirring shaft is further adapted to drive the filter assembly to rotate when rotating.
8. The apparatus for detecting polymerization of a polyacrylonitrile solution according to claim 7,
the filter assembly comprises a shaft sleeve, a connecting plate and a filter plate;
the shaft sleeve is rotationally connected to the top of the lifting block and is connected to the sliding chute in a sliding manner;
one end of the connecting plate is fixedly arranged on the side wall of the shaft sleeve, and the other end of the connecting plate is close to the inner wall of the reaction kettle;
the filter plate is fixedly arranged on the connecting plate and is close to the inner wall of the reaction kettle.
9. The apparatus for detecting polymerization of a polyacrylonitrile solution according to claim 8, wherein,
storage plates are arranged on two sides of the filter plate;
the storage plate is fixedly arranged on the connecting plate;
the filter is the arc, the bottom of arc is fixed to be set up on the connecting plate, wherein, the filter is made by elastic material.
10. The apparatus for detecting polymerization of a polyacrylonitrile solution according to claim 9, wherein,
the detection device for polyacrylonitrile solution polymerization further comprises a shoveling plate fixedly arranged at the upper part of the inner wall of the reaction kettle;
the filter plate is adapted to scoop solution impurities from the filter plate when the filter plate is rotated into contact with the scooping plate.
11. A detection method using the detection device for polyacrylonitrile solution polymerization according to any one of claims 1 to 10, characterized in that the method comprises:
inputting the solution into a reaction kettle;
controlling a temperature detection module to detect the temperature of the reaction kettle;
the control module controls the water bath heating module to adjust the temperature of the reaction kettle according to the detection result of the temperature detection module.
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