CN214210174U - Pyromellitic acid production and preparation device - Google Patents
Pyromellitic acid production and preparation device Download PDFInfo
- Publication number
- CN214210174U CN214210174U CN202022647724.9U CN202022647724U CN214210174U CN 214210174 U CN214210174 U CN 214210174U CN 202022647724 U CN202022647724 U CN 202022647724U CN 214210174 U CN214210174 U CN 214210174U
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- CN
- China
- Prior art keywords
- tank body
- fixedly connected
- stirring tank
- pyromellitic acid
- acid production
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- CYIDZMCFTVVTJO-UHFFFAOYSA-N pyromellitic acid Chemical compound OC(=O)C1=CC(C(O)=O)=C(C(O)=O)C=C1C(O)=O CYIDZMCFTVVTJO-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 238000003756 stirring Methods 0.000 claims abstract description 68
- 238000001816 cooling Methods 0.000 claims abstract description 55
- 238000001914 filtration Methods 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 241000220317 Rosa Species 0.000 claims abstract description 10
- 239000002826 coolant Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 4
- 210000001503 Joints Anatomy 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 11
- 238000002425 crystallisation Methods 0.000 abstract description 9
- 230000005712 crystallization Effects 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000000706 filtrate Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 4
- 239000000110 cooling liquid Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- SQNZJJAZBFDUTD-UHFFFAOYSA-N Durene Chemical compound CC1=CC(C)=C(C)C=C1C SQNZJJAZBFDUTD-UHFFFAOYSA-N 0.000 description 1
- 229920002456 HOTAIR Polymers 0.000 description 1
- 229920002319 Poly(methyl acrylate) Polymers 0.000 description 1
- 229920001225 Polyester resin Polymers 0.000 description 1
- 229920001721 Polyimide Polymers 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005662 electromechanics Effects 0.000 description 1
- 230000002708 enhancing Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- ANSXAPJVJOKRDJ-UHFFFAOYSA-N furo[3,4-f][2]benzofuran-1,3,5,7-tetrone Chemical compound C1=C2C(=O)OC(=O)C2=CC2=C1C(=O)OC2=O ANSXAPJVJOKRDJ-UHFFFAOYSA-N 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
The utility model belongs to the technical field of pyromellitic acid production, especially, be an pyromellitic acid production preparation facilities, including the agitator tank body, the top of agitator tank body is provided with the motor, the inner wall fixedly connected with cross dead lever of agitator tank body, the upper surface of cross dead lever rotates and is connected with the pivot, the tip of pivot run through the top of agitator tank body and with the output shaft fixed connection of motor, the fixed surface of pivot is connected with the puddler, the inner wall fixedly connected with of agitator tank body returns the shape frame, the inner wall fixedly connected with hot plate of shape frame returns, it has the baffle to peg graft in one side of agitator tank body, it has the rose box to peg graft in one side of agitator tank body. The utility model discloses a motor, puddler, hot plate, baffle, rose box and cooling barrel cooperate, have solved current pyromellitic acid production preparation facilities self and have been not convenient for carry out hot filtration, be not convenient for take out the filter residue and the slow production efficiency low problem of natural cooling crystallization process to the mixed liquid after the stirring.
Description
Technical Field
The utility model relates to a pyromellitic acid production technical field specifically is a pyromellitic acid production preparation facilities.
Background
Pyromellitic acid, abbreviated as PMA in English, is used as a main synthetic monomer of polyimide which is a high-temperature-resistant insulating material, is widely applied to the fields of aerospace, aviation, electromechanics, electronics and the like, and is also an important curing agent for epoxy resin and polyester resin and an auxiliary agent for powder coating. At present, the pyromellitic acid is refined by a hot air carrying method. The method is only limited to the method of using durene as raw material and has high unit consumption; the product purity is low, only 96%, the catalyst carrier is single, pyromellitic acid needs to be hydrolyzed and decolored in the production and preparation process, the temperature needs to be heated to 85-95 ℃, the mixture is stirred for one hour and then is subjected to thermal filtration treatment, then the filtrate is placed into a cooling tank for crystallization, the filter residue is mixed with coal and burned off, the filtrate is cooled to room temperature for centrifugal drying, pyromellitic acid with the water content of 15-30% is obtained, and the pyromellitic acid is obtained after drying.
The prior pyromellitic acid production and preparation device has the following defects:
1. the existing pyromellitic acid production and preparation device is inconvenient for carrying out hot filtration on the mixed liquid after stirring, the mixed liquid needs to be discharged from the stirring device into the filtering device for filtering, the heat loss of the mixed liquid can be caused in the process, the operation is troublesome, the occupied area of the equipment is large, and the filter residue is not convenient to take out;
2. in the crystallization process, the time consumed by natural cooling is too long, the production efficiency is low, and cooled pyromellitic acid is not convenient to take out.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
Not enough to prior art, the utility model provides a pyromellitic acid production preparation facilities has solved current pyromellitic acid production preparation facilities self and has been not convenient for carry out hot filtration, be not convenient for take out the filter residue and the slow production efficiency of natural cooling crystallization process low problem to mixed liquid after the stirring.
(II) technical scheme
In order to achieve the above object, the utility model provides a following technical scheme: a production and preparation device of pyromellitic acid comprises a stirring tank body, wherein a motor is arranged at the top of the stirring tank body, a cross-shaped fixing rod is fixedly connected to the inner wall of the stirring tank body, a rotating shaft is rotatably connected to the upper surface of the cross-shaped fixing rod, the end part of the rotating shaft penetrates through the top of the stirring tank body and is fixedly connected with an output shaft of the motor, a stirring rod is fixedly connected to the surface of the rotating shaft, a clip-shaped frame is fixedly connected to the inner wall of the stirring tank body, a heating plate is fixedly connected to the inner wall of the clip-shaped frame, a baffle is inserted into one side of the stirring tank body, a filter box is inserted into one side of the stirring tank body, the other side of the stirring tank body is communicated with a connecting pipe, the end part of the connecting pipe is communicated with a cooling tank, a tank cover is inserted into the top of the cooling tank, and a vertical rod is fixedly connected to the bottom of the tank cover, the utility model discloses a cooling barrel, including cooling bucket, filtration basket, montant, cooling bucket, cooling tube's inner bottom wall has been cup jointed to the inner bottom wall of cooling bucket, the lower extreme of montant and the inner bottom wall fixed connection of filtration basket, the cavity has been seted up to the inside of cooling bucket, the inside filling of cavity has the coolant liquid, the inside of cavity is provided with the cooling tube, the surface intercommunication of cooling bucket has inlet tube and outlet pipe, the one end and the inlet tube intercommunication of cooling tube, the other end and the outlet pipe intercommunication of cooling tube.
As a preferred technical scheme of the utility model, the rectangular hole has been seted up to one side of agitator tank body, and the inner wall of rectangular hole is provided with the rectangle sealing ring, the spout has been seted up to agitator tank body inner wall, the baffle run through the rectangular hole and with the inner wall sliding connection of spout.
As a preferred technical scheme of the utility model, one side fixedly connected with horizontal pole of baffle, the top fixedly connected with U-shaped handle of horizontal pole, T shape inserted bar has been seted up at the top of U-shaped handle, T shape inserted bar runs through in the U-shaped handle and extends to the horizontal pole.
As a preferred technical scheme of the utility model, the inner wall fixedly connected with V font filter screen of rose box, the interior diapire fixedly connected with arc guide plate of rose box.
As an optimal technical scheme of the utility model, the fixed surface of rose box is connected with L shape dead lever, the surface sliding connection of L shape dead lever has L shape inserted bar, the top of L shape inserted bar is provided with movable sleeve and establishes the spring on L shape fixed rod surface.
As a preferred technical scheme of the utility model, one side fixedly connected with rectangular block of agitator tank body, the slot has been seted up to the upper surface of rectangular block.
(III) advantageous effects
Compared with the prior art, the utility model provides a pyromellitic acid production preparation facilities possesses following beneficial effect:
1. the pyromellitic acid production and preparation device comprises a motor, a stirring rod, a heating plate, a baffle and a V-shaped filter screen, wherein the motor is arranged, the stirring rod is matched with the V-shaped filter screen, the motor can drive the stirring rod to rotate at a constant speed, the stirring rod can uniformly stir raw materials in a stirring tank body, the heating plate can heat the raw materials in the stirring process, so that the temperature in the stirring tank body can reach the temperature required by the production of pyromellitic acid, the stirring tank body can be divided into a stirring area and a filtering area by the baffle, the mixed liquid after the stirring is finished can be filtered by the V-shaped filter screen, the required filtrate is discharged into a cooling barrel from a through hole on the filtering box, the filter residue is left in the filtering box, the V-shaped filter screen can be conveniently communicated and taken out together, the filter residue can be conveniently cleaned and the V-shaped filter screen can be cleaned, and therefore, the hot filtering work can be directly finished in the stirring tank body, the heat can not be lost, the operation is convenient, the occupied area of the equipment is small, and the resources are saved.
2. This pyromellitic acid production preparation facilities, cooling barrel through setting up, the filtration basket, cooling tube and cavity cooperate, the inside filling of cavity has the coolant liquid, the inside of cooling tube can circulate and lead to water, make the coolant liquid can remain a lower temperature throughout, and then can reduce the holistic temperature of cooling barrel, accelerate the speed of crystallization and shorten the required time of crystallization, improve pyromellitic acid's production efficiency, the setting of filtration basket is convenient for take out the solid after the crystallization, the simple operation.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a sectional view of the present invention;
fig. 3 is a schematic structural view of the filter box of the present invention.
In the figure: 1. a stirred tank body; 2. a motor; 3. a cross-shaped fixing rod; 4. a rotating shaft; 5. a stirring rod; 6. a clip frame; 7. heating plates; 8. a baffle plate; 801. a cross bar; 802. a U-shaped handle; 803. a T-shaped insertion rod; 9. a filter box; 901. a V-shaped filter screen; 902. an L-shaped fixing rod; 903. an L-shaped insert rod; 904. a spring; 905. a rectangular block; 906. an arc-shaped guide plate; 10. a connecting pipe; 11. a cooling barrel; 12. a barrel cover; 13. a vertical rod; 14. a filter basket; 15. a cavity; 16. a cooling tube; 17. a water inlet pipe; 18. and (5) discharging a water pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Examples
Referring to fig. 1-3, the present invention provides the following technical solutions: a production and preparation device of pyromellitic acid comprises a stirring tank body 1, wherein a motor 2 is arranged at the top of the stirring tank body 1, a cross-shaped fixing rod 3 is fixedly connected to the inner wall of the stirring tank body 1, a rotating shaft 4 is rotatably connected to the upper surface of the cross-shaped fixing rod 3, the end part of the rotating shaft 4 penetrates through the top of the stirring tank body 1 and is fixedly connected with an output shaft of the motor 2, a stirring rod 5 is fixedly connected to the surface of the rotating shaft 4, a clip-shaped frame 6 is fixedly connected to the inner wall of the stirring tank body 1, a heating plate 7 is fixedly connected to the inner wall of the clip-shaped frame 6, a baffle 8 is inserted into one side of the stirring tank body 1, a filter box 9 is inserted into one side of the stirring tank body 1, a connecting pipe 10 is communicated with the other side of the stirring tank body 1, the end part of the connecting pipe 10 is communicated with a cooling tank 11, a tank cover 12 is inserted into the top of the cooling tank 11, a vertical rod 13 is fixedly connected to the bottom of the tank cover 12, the inner bottom wall of cooling barrel 11 has been met and has been strained basket 14, the lower extreme of montant 13 and the inner bottom wall fixed connection of straining basket 14, cavity 15 has been seted up to the inside of cooling barrel 11, the inside filling of cavity 15 has the coolant liquid, the inside of cavity 15 is provided with cooling tube 16, the surface intercommunication of cooling barrel 11 has inlet tube 17 and outlet pipe 18, the one end and the inlet tube 17 intercommunication of cooling tube 16, the other end and the outlet pipe 18 intercommunication of cooling tube 16.
In the embodiment, the diagonal rod is fixedly connected between the stirring rod 5 and the rotating shaft 4, the arrangement of the diagonal rod can enhance the stirring effect, the heating plate 7 can heat the raw materials in the stirring process, so that the temperature in the stirring tank body 1 can reach the temperature required by the production of pyromellitic acid, the baffle 8 can divide the stirring tank body 1 into a stirring area and a filtering area, the filtering box 9 is arranged to facilitate the taking out of the V-shaped filtering net 901 communicated with the filtering residues, the cleaning of the filtering residues and the cleaning of the V-shaped filtering net 901, thereby the hot filtering work can be directly completed in the stirring tank body 1 without heat loss, the cooling pipe 16 is spirally arranged in the cavity 15 formed in the cooling barrel 11, the inner wall of the cooling barrel 11 can be uniformly cooled, the water cooling treatment is carried out through the cooling liquid, and the cooling process is mild, chemical composition in the filtrating can not be destroyed, the setting of inlet tube 17 and outlet pipe 18 can lead to water to the cooling tube 16 circulation, the temperature on the cooling tube 16 surface is less than the temperature of coolant liquid, can absorb the heat of coolant liquid for the coolant liquid remains a lower temperature throughout, the inner wall of inlet tube 17 and outlet pipe 18 all is provided with the sealing washer, prevents to leak, and the surface of inlet tube 17 and outlet pipe 18 all is provided with the valve, is convenient for control intaking and goes out water.
Specifically, the rectangular hole has been seted up to one side of agitator tank body 1, and the inner wall of rectangular hole is provided with the rectangle sealing ring, and the spout has been seted up to 1 inner wall of agitator tank body, baffle 8 run through the rectangular hole and with the inner wall sliding connection of spout.
In this embodiment, the sealing ring can prevent the baffle 8 from leaking water when sliding along the inner wall of the chute.
Specifically, a cross bar 801 is fixedly connected to one side of the baffle 8, a U-shaped handle 802 is fixedly connected to the top of the cross bar 801, a T-shaped insertion rod 803 is arranged at the top of the U-shaped handle 802, and the T-shaped insertion rod 803 penetrates through the U-shaped handle 802 and extends into the cross bar 801.
In this embodiment, the setting of U-shaped handle 802 is convenient for operating personnel to stimulate baffle 8, and the setting of T shape inserted bar 803 can the position of fixed stop 8, avoids rocking the in-process production of stirring and leads to baffle 8 to remove.
Specifically, the inner wall of the filtering box 9 is fixedly connected with a V-shaped filtering net 901, and the inner bottom wall of the filtering box 9 is fixedly connected with an arc-shaped guide plate 906.
In this embodiment, the mixed liquid after the stirring is accomplished can be filtered in the setting of V font filter screen 901, arrange required filtrating in cooling barrel 11 from through-hole on rose box 9, leave the filter residue in rose box 9, the setting of V font filter screen 901 can make the filter residue concentrate the bottom of piling up at V font filter screen 901, increase the area of filter screen, make the difficult easy filter residue of filter screen surface pile up and lead to the filter screen to block up, improve filterable efficiency, arc guide plate 906's setting can make the filtrating in the agitator tank body 1 can all be arranged in cooling barrel 11.
Specifically, an L-shaped fixing rod 902 is fixedly connected to the surface of the filter box 9, an L-shaped inserting rod 903 is slidably connected to the surface of the L-shaped fixing rod 902, and a spring 904 movably sleeved on the surface of the L-shaped fixing rod 902 is arranged at the top of the L-shaped inserting rod 903.
In this embodiment, the setting of L shape inserted bar 903 is convenient for fix the position of rose box 9, avoids rose box 9 to produce at the stirring in-process and rocks and breaks away from with agitator tank body 1, and the setting of spring 904 can drive L shape inserted bar 903 fast and reset.
Specifically, one side fixedly connected with rectangular block 905 of agitator tank body 1, the slot has been seted up to rectangular block 905's upper surface.
In this embodiment, the slot formed on the upper surface of the rectangular block 905 is matched with the size of the L-shaped rod 903, so that the L-shaped rod 903 can be just inserted into the slot.
The utility model discloses a theory of operation and use flow: when pyromellitic acid is produced, a crude pyromellitic anhydride product obtained by a catcher is required to be placed into a stirring tank body 1 according to a certain weight ratio, at the moment, a motor 2 is started, the motor 2 can drive a stirring rod 5 to rotate at a constant speed through a rotating shaft 4, the stirring rod 5 can uniformly stir raw materials in the stirring tank body 1, the raw materials can be heated in the stirring process through a heating plate 7, the temperature in the stirring tank body 1 is heated to a required production temperature, after stirring for one hour, a T-shaped inserting rod 803 is pulled out, a baffle 8 is pulled through a U-shaped handle 802, mixed liquid in the stirring tank body 1 flows into a filter box 9 under the action of gravity for hot filtration, the mixed liquid can pass through a V-shaped filter screen 901, the mixed liquid after stirring can be filtered, and required filtrate is discharged into a cooling barrel 11 from a through hole on the filter box 9, the filter residue is left in the filter box 9, so that the heat filtering work can be directly completed in the stirring tank body 1, heat loss is avoided, the operation is convenient, resources are saved, filtrate can flow into the cooling barrel 11 along the connecting pipe 10, the surface of the connecting pipe 10 is provided with the one-way valve, when the filtrate completely enters the cooling barrel 11, the one-way valve is closed, the cavity 15 is formed in the cooling barrel 11, the cooling liquid is filled in the cavity 15, the cooling pipe 16 can be circulated to enable the cooling liquid to be kept at a lower temperature all the time, the overall temperature of the cooling barrel 11 can be reduced, the crystallization speed is accelerated, the time required by crystallization is shortened, the production efficiency of pyromellitic acid is improved, the barrel cover 12 is lifted upwards, the barrel cover 12 can drive the filter basket 14 to move upwards through the vertical rod 13, and the crystallized solid can be taken out conveniently, the operation is convenient.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. 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 (6)
1. The utility model provides a pyromellitic acid production preparation facilities, includes agitator tank body (1), its characterized in that: the stirring tank is characterized in that a motor (2) is arranged at the top of a stirring tank body (1), a cross-shaped fixing rod (3) is fixedly connected to the inner wall of the stirring tank body (1), a rotating shaft (4) is rotatably connected to the upper surface of the cross-shaped fixing rod (3), the end portion of the rotating shaft (4) penetrates through the top of the stirring tank body (1) and is fixedly connected with an output shaft of the motor (2), a stirring rod (5) is fixedly connected to the surface of the rotating shaft (4), a clip-shaped frame (6) is fixedly connected to the inner wall of the stirring tank body (1), a heating plate (7) is fixedly connected to the inner wall of the clip-shaped frame (6), a baffle (8) is inserted into one side of the stirring tank body (1), a filter box (9) is inserted into one side of the stirring tank body (1), a connecting pipe (10) is communicated with the other side of the stirring tank body (1), and the end portion of the connecting pipe (10) is communicated with a cooling barrel (11), the top of cooling barrel (11) is pegged graft and is had bung (12), the bottom fixedly connected with montant (13) of bung (12), the interior diapire butt joint of cooling barrel (11) has filtration basket (14), the lower extreme of montant (13) and the interior diapire fixed connection of filtration basket (14), cavity (15) have been seted up to the inside of cooling barrel (11), the inside filling of cavity (15) has the coolant liquid, the inside of cavity (15) is provided with cooling tube (16), the surface intercommunication of cooling barrel (11) has inlet tube (17) and outlet pipe (18), the one end and inlet tube (17) intercommunication of cooling tube (16), the other end and outlet pipe (18) intercommunication of cooling tube (16).
2. The pyromellitic acid production and preparation apparatus according to claim 1, wherein: the stirring tank is characterized in that a rectangular hole is formed in one side of the stirring tank body (1), a rectangular sealing ring is arranged on the inner wall of the rectangular hole, a sliding groove is formed in the inner wall of the stirring tank body (1), and the baffle (8) penetrates through the rectangular hole and is in sliding connection with the inner wall of the sliding groove.
3. The pyromellitic acid production and preparation apparatus according to claim 1, wherein: one side fixedly connected with horizontal pole (801) of baffle (8), the top fixedly connected with U-shaped handle (802) of horizontal pole (801), T shape inserted bar (803) have been seted up at the top of U-shaped handle (802), T shape inserted bar (803) run through U-shaped handle (802) and extend to in horizontal pole (801).
4. The pyromellitic acid production and preparation apparatus according to claim 1, wherein: the inner wall of the filter box (9) is fixedly connected with a V-shaped filter screen (901), and the inner bottom wall of the filter box (9) is fixedly connected with an arc-shaped guide plate (906).
5. The pyromellitic acid production and preparation apparatus according to claim 1, wherein: the surface fixed connection of rose box (9) has L shape dead lever (902), the surperficial sliding connection of L shape dead lever (902) has L shape inserted bar (903), the top of L shape inserted bar (903) is provided with movable sleeve and establishes spring (904) on L shape dead lever (902) surface.
6. The pyromellitic acid production and preparation apparatus according to claim 1, wherein: one side fixedly connected with rectangular block (905) of agitator tank body (1), the slot has been seted up to the upper surface of rectangular block (905).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022647724.9U CN214210174U (en) | 2020-11-16 | 2020-11-16 | Pyromellitic acid production and preparation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022647724.9U CN214210174U (en) | 2020-11-16 | 2020-11-16 | Pyromellitic acid production and preparation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214210174U true CN214210174U (en) | 2021-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022647724.9U Active CN214210174U (en) | 2020-11-16 | 2020-11-16 | Pyromellitic acid production and preparation device |
Country Status (1)
| Country | Link |
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| CN (1) | CN214210174U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114259750A (en) * | 2021-11-16 | 2022-04-01 | 孙恒祥 | Chemical refining and crystallizing device |
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2020
- 2020-11-16 CN CN202022647724.9U patent/CN214210174U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114259750A (en) * | 2021-11-16 | 2022-04-01 | 孙恒祥 | Chemical refining and crystallizing device |
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