CN210846370U - Esterification and rectification integrated reaction device - Google Patents
Esterification and rectification integrated reaction device Download PDFInfo
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- CN210846370U CN210846370U CN201921597636.3U CN201921597636U CN210846370U CN 210846370 U CN210846370 U CN 210846370U CN 201921597636 U CN201921597636 U CN 201921597636U CN 210846370 U CN210846370 U CN 210846370U
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Abstract
The utility model relates to the technical field of esterification product production, in particular to an esterification and rectification integrated reaction device, which comprises a reaction kettle, a reaction tower is arranged at the top end of the reaction kettle, one end of the reaction tower far away from the reaction kettle is communicated with a condenser through a pipeline, the condenser is communicated with the single separator through a pipeline, the single separator is communicated with the multiple separators through a pipeline, the multiple separators are connected into the reaction kettle through a pipeline, one end of the single separator is provided with a return pipe, the return pipe is connected with the inside of one end of the reaction tower far away from the reaction kettle, a first control valve is arranged on the return pipe, a second control valve is arranged on a pipeline which is communicated with the multiple separators and the single separator, and a pipeline for communicating the multiple separator with the reaction kettle is provided with a third control valve. The utility model discloses have through making and esterify and go on in the reaction tower of rectification sharing, reduce the effect of the cost of equipment manufacturing.
Description
Technical Field
The utility model relates to a technical field of esterification product production especially relates to an esterification and rectification integration reaction unit.
Background
Generally, the water generated by the esterification reaction needs to be removed in time to favor the reaction and then the reaction is carried out. The method can accelerate the generation of the esterified substance, has a plurality of water removal methods, can also use a solvent which can be azeotroped with water, takes out water in the boiling point state of the solvent, separates water, reflows the solvent into an esterification reaction kettle, pumps the solution of the esterified substance into a reaction tower after the esterification reaction is finished, and respectively rectifies the solvent and the esterified substance.
The prior Chinese utility model patent with publication number CN207169709U discloses an esterification and rectification dual-purpose reaction device, which comprises a reaction kettle, wherein an esterification tower and a rectification tower are arranged at the top end of the reaction kettle, one end of the esterification tower, which is far away from the reaction kettle, is communicated with a condenser through a pipeline, the condenser is communicated with a single separator through a pipeline, the single separator is communicated with multiple separators through a pipeline, and the multiple separators are connected into the reaction kettle through a pipeline; the reactants and the catalyst are put into a reaction barrel, and then enter an esterification tower to react, the water generated after esterification is discharged through a condenser, a single separator and a multiple separator, and the produced ester is sent into a rectifying tower to be rectified.
The above prior art solutions have the following drawbacks: although the whole process can be completed in one device, rectification is still required after the esterification is completed, and the division of the esterification tower and the rectification tower cannot provide flow acceleration for the whole ester production process, and the manufacturing cost of the device is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an esterify and rectify integrated reaction unit, go on in the reaction tower through making esterify and rectify a sharing, reduce the cost that equipment made.
The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:
the utility model provides an esterify and rectification integration reaction unit, includes reation kettle, the reation kettle top is provided with the reaction tower, the reation tower is kept away from reation kettle's one end is passed through pipeline and condenser intercommunication, the condenser passes through pipeline and single separator intercommunication, single separator passes through pipeline and multiple separator intercommunication, multiple separator passes through the pipeline and links into in the reation kettle, single separator one end is provided with the back flow, the back flow links into the reation tower is kept away from the inside of reation kettle one end, be provided with first control valve on the back flow, multiple separator with be provided with the second control valve on the pipeline of single separator intercommunication each other, multiple separator with be provided with the third control valve on the pipeline of reation kettle intercommunication each other.
By adopting the technical scheme, organic acid, organic alcohol and solvent are added into a reaction kettle, the reaction kettle is subjected to esterification reaction firstly, a first control valve is closed, a second control valve and a third control valve are opened, the organic alcohol and the organic acid react in the reaction kettle, gas generated by the reaction is condensed into liquid through a reaction tower and a condenser, the gas is separated by a single separator, liquid ester and water are separated by multiple separators, and the liquid ester flows back to the reaction kettle again; the whole device can discharge water completely, reduce the time of esterification reaction through total reflux, and improve the purity of products; after the esterification is finished, carrying out rectification reaction on the reaction kettle, and at the moment, ester, solvent and impurities remain in the reaction kettle, wherein the solvent is cyclohexane and the boiling point is lower than that of the ester; the first control valve and the second control valve are opened, the third control valve is closed, the temperature of the reaction kettle is raised to evaporate cyclohexane, the reaction kettle is raised again after being discharged to be clean to evaporate ester into a gaseous state, the gaseous ester is liquefied through a condenser, part of liquid ester is shunted through a backflow pipe and enters the reaction tower again, the reaction tower is protected by lowering the temperature, and the other part of the liquid ester is recovered and circulated for multiple times until the rectification is finished; the whole device utilizes the difference of boiling point to draw ester, refines simply fast, and the refluence makes the interior gas-liquid exchange of tower once more, can also protection device, esterifies and the rectification reaction through same container, has improved the efficiency of refining of product, makes simultaneously and esterify and go on in the common reaction tower of rectification, reduces the cost that equipment made.
The utility model discloses further set up to: the reflux pipe is positioned at one end in the reaction tower and is provided with a spray head, the installation height of the condenser is higher than that of the single separator, the installation height of the single separator is higher than that of the spray head, the installation height of the spray head is higher than that of the multiple separators, and the installation height of the multiple separators is higher than that of the reaction kettle.
Through adopting above-mentioned technical scheme, during gas after the vaporization can get into the condenser of eminence, liquid after the condensation down flows from the eminence, relies on self gravity to flow back once more and gets into reation kettle.
The utility model discloses further set up to: and one ends of the single separator and the multiple separators are communicated with a vacuum pump through pipelines.
By adopting the technical scheme, the vacuum pump can extract gas generated in the reaction process on one hand, and on the other hand, the vacuum pump can enable the inside of the reaction tower to be close to a vacuum state, so that the boiling point of the ester is reduced, and the ester is easier to vaporize.
The utility model discloses further set up to: and a vacuum tank is arranged between the single separator and the multiple separators and the vacuum pump.
Through adopting above-mentioned technical scheme, the vacuum pump can take out a small amount of liquid ester and water in the single separator when taking out from gaseous, also can take out the liquid ester on upper strata in the multiple separator simultaneously, and the vacuum tank can be collected liquid ester and water and prevent that liquid ester from being taken out and sending into the air in and causing the pollution of wasting of resources and environment.
The utility model discloses further set up to: and a fourth control valve is arranged between the single separator and the vacuum pump, and a fifth control valve is arranged between the multiple separators and the vacuum pump.
Through adopting above-mentioned technical scheme, can prevent that the gas of evaporation is taken out by the vacuum pump when rectifying through fourth control valve and fifth control valve.
The utility model discloses further set up to: the multiple separators are connected with a collecting tank through a pipeline, the collecting tank is communicated with a vacuum tank through a pipeline, a sixth control valve is installed on the pipeline between the multiple separators and the collecting tank, and a seventh control valve is installed on the pipeline between the collecting tank and the vacuum tank.
Through adopting above-mentioned technical scheme, vacuum tank can collect the esterification thing after the rectification is accomplished, and collecting tank intercommunication vacuum tank can make the gas in the vacuum pump extraction collecting tank produce the negative pressure in making the collecting tank, impresses the esterification thing into the collecting tank through pressure, makes things convenient for the collection of esterification thing, and vacuum tank can collect the little value thing of being taken out in the collecting tank simultaneously and get up to cause waste and environmental pollution in order to prevent that the esterification thing is directly taken out the entering air.
The utility model discloses further set up to: the reaction kettle is provided with a stirring mechanism in a rotating mode, the top end of the reaction kettle is provided with a driving device for driving the stirring mechanism to move, and the stirring mechanism is in transmission fit with the driving device.
Through adopting above-mentioned technical scheme, rabbling mechanism cooperation drive arrangement has realized stirring the mixture in the reation kettle for reaction rate.
The utility model discloses further set up to: the bottom end of the multiple separator is connected with a collecting box through a pipeline, an eighth control valve is installed on the pipeline between the collecting box and the collecting box, and a liquid level detector is arranged in the collecting box.
Through adopting above-mentioned technical scheme, when the esterification reaction, the collecting box can collect the water that the esterification reaction produced to monitor through the liquid level detector, when the rectification reaction, the collecting box can collect the complete ester of reaction.
The utility model discloses further set up to: the return pipe is provided with a flowmeter.
By adopting the technical scheme, the reflux pipe can control the amount of the liquid ester entering the reaction tower in the process of re-refluxing.
The utility model discloses further set up to: one end of the reaction tower, which is far away from the reaction tank, is provided with a dissolution discharge pipe, and a ninth control valve is installed on the dissolution discharge pipe.
Through adopting above-mentioned technical scheme, ninth control valve and row's solution pipe cooperation can be discharged gaseous solvent when the rectification to make the ester purity higher.
To sum up, the utility model discloses a beneficial technological effect does:
1. the esterification and the rectification are carried out in one reaction tower, so that the equipment manufacturing cost is reduced;
2. the vacuum pump can extract gas generated in the reaction process, and can enable the inside of the reaction tower to be close to a vacuum state, so that the boiling point of the ester is reduced, and the ester is easier to vaporize;
3. the vacuum tank can collect the liquid ester and water to prevent the liquid ester from being pumped out and sent into the air to cause resource waste and environmental pollution;
4. the vacuum tank can collect the esterified substance after rectification is finished, the collecting tank is communicated with the vacuum tank, so that the vacuum pump can extract gas in the collecting tank to generate negative pressure in the collecting tank, the esterified substance is pressed into the collecting tank through pressure, the collection of the esterified substance is facilitated, and meanwhile, the vacuum tank can collect a small amount of valuable substance extracted from the collecting tank to prevent the esterified substance from being directly extracted into air to cause waste and environmental pollution;
5. the stirring mechanism is matched with the driving device to stir the mixture in the reaction kettle, so that the reaction speed is increased;
6. when the esterification reaction is carried out, the collecting box can collect water generated by the esterification reaction and monitor the water through the liquid level detector, and when the rectification reaction is carried out, the collecting box can collect ester which is completely reacted;
7. the reflux pipe can control the amount of the liquid ester entering the reaction tower in the process of re-refluxing;
8. the ninth control valve and the solvent discharge pipe are matched to discharge gaseous solvent during rectification, so that the purity of the esterified substance is higher.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.
Fig. 3 is a partially enlarged schematic view of a portion B in fig. 1.
Fig. 4 is a partially enlarged schematic view of a portion C in fig. 1.
In the figure, 1, a reaction kettle; 2. a reaction tower; 3. a condenser; 4. a single separator; 5. a multiple separator; 6. a return pipe; 7. a first control valve; 8. a second control valve; 9. a third control valve; 10. a spray head; 11. a vacuum pump; 12. a vacuum tank; 13. a fourth control valve; 14. a fifth control valve; 15. a collection tank; 16. a sixth control valve; 17. a seventh control valve; 18. a stirring mechanism; 19. a drive device; 20. a collection box; 21. an eighth control valve; 22. a liquid level detector; 23. a flow meter; 24. a dissolution pipe is discharged; 25. a ninth control valve.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, for the utility model discloses an esterification and rectification integrated reaction device, which comprises a reaction kettle 1, a reaction tower 2 is arranged at the top end of the reaction kettle 1, ceramic filler is filled in the reaction tower 2, the ceramic filler is acid-resistant and alkali-resistant and can prolong the service life of the reaction tower 2, one end of the reaction tower 2 far away from the reaction kettle 1 is communicated with a condenser 3 through a pipeline, the condenser 3 is communicated with a single separator 4 through a pipeline, the single separator 4 has the function of separating gas and liquid, the single separator 4 is communicated with a multiple separator 5 through a pipeline, the multiple separator 5 has the function of separating multiple liquids and gases, the multiple separator 5 is connected into the reaction kettle 1 through a pipeline, a return pipe 6 is arranged at one end of the single separator 4, the return pipe 6 is connected into the interior of the reaction tower 2 far away from one end of the reaction kettle 1, a first control valve 7 is arranged on, a second control valve 8 is arranged on a pipeline which is communicated with the multiple separator 5 and the single separator 4, and a third control valve 9 is arranged on a pipeline which is communicated with the multiple separator 5 and the reaction kettle 1. Adding organic acid, organic alcohol and a solvent into a reaction kettle 1, carrying out esterification reaction in the reaction kettle 1, closing a first control valve 7, opening a second control valve 8 and a third control valve 9, reacting the organic alcohol and the organic acid in the reaction kettle 1, condensing gas generated by the reaction into liquid through a reaction tower 2 and a condenser 3, separating the gas through a single separator 4, separating liquid ester from water through a multiple separator 5, and refluxing the liquid ester into the reaction kettle 1 again; the whole device can discharge water completely, reduce the time of esterification reaction through total reflux, and improve the purity of products; after the esterification is finished, the reaction kettle 1 is subjected to rectification reaction again, at the moment, ester and a solvent are remained in the reaction kettle 1, the solvent is cyclohexane, the boiling point of the ester is 180 ℃, the boiling point of the cyclohexane is 78 ℃, and the boiling point of the cyclohexane is lower than that of the ester; opening a first control valve 7 and a second control valve 8, closing a third control valve 9, heating the reaction kettle 1 to evaporate cyclohexane, heating the reaction kettle 1 again after the cyclohexane is discharged to be clean to evaporate ester into a gaseous state, liquefying the gaseous ester through a condenser 3, shunting part of liquid ester through a return pipe 6 to enter the reaction tower 2 again, cooling and protecting the reaction tower 2, and recycling the other part of liquid ester for multiple times until the rectification is finished; whole device utilizes the difference of boiling point to draw the ester, refines simply fast, and the refluence makes the interior gas-liquid exchange of tower once more, can also protection device esterifies and rectification reaction through same container, has improved the efficiency of refining of product, makes simultaneously esterify and go on in the shared reaction tower 2 of rectification, reduces the cost that equipment made.
Referring to fig. 1 and 2, a spray head 10 is arranged at one end of a return pipe 6 in the reaction tower 2, the installation height of a condenser 3 is higher than that of a single separator 4, the installation height of the single separator 4 is higher than that of the spray head 10, the installation height of the spray head 10 is higher than that of a multiple separator 5, the installation height of the multiple separator 5 is higher than that of a reaction kettle 1, vaporized gas can enter the condenser 3 at a high position, and condensed liquid flows downwards from the high position and flows back to the reaction kettle 1 again by means of self gravity.
Referring to fig. 1, a vacuum pump 11 is connected to one end of each of the single separator 4 and the multiple separators 5 through a pipe, and the vacuum pump 11 can pump gas generated in the reaction process, and can make the inside of the reaction tower 2 close to a vacuum state, so that the boiling point of ester is reduced and the ester is more easily vaporized; a vacuum tank 12 is arranged between the single separator 4 and the multiple separators 5 and the vacuum pump 11, the vacuum pump 11 can pump out a small amount of liquid ester and water in the single separator 4 when pumping out gas, and can also pump out the liquid ester on the upper layer in the multiple separators 5, and the vacuum tank 12 can collect the liquid ester and the water to prevent the liquid ester from being pumped out and sent into the air to cause resource waste and environmental pollution; a fourth control valve 13 is arranged between the single separator 4 and the vacuum pump 11, a fifth control valve 14 is arranged between the multiple separator 5 and the vacuum pump 11, and evaporated gas can be prevented from being pumped out by the vacuum pump 11 during rectification through the fourth control valve 13 and the fifth control valve 14; multiple separator 5 has a collection tank 15 through the pipe connection, install sixth control valve 16 on the pipeline between collection tank 15 and the collection tank 15 through the pipeline intercommunication vacuum tank 12 multiple separator 5, install seventh control valve 17 on the pipeline between collection tank 15 and the vacuum tank 12, vacuum tank 12 can collect the esterification thing after the rectification is accomplished, collection tank 15 intercommunication vacuum tank 12 can make the gas in the vacuum pump 11 extraction collection tank 15 make the collection tank 15 in produce the negative pressure, impress the esterification thing into collection tank 15 through pressure, make things convenient for the collection of esterification thing, vacuum tank 12 can collect the few valuables of being taken out in the collection tank 15 simultaneously and prevent that the esterification thing from directly being taken out and causing waste and environmental pollution in getting into the air.
Referring to fig. 1, stirring mechanism 18 is arranged in reaction kettle 1 to rotate, a driving device 19 for driving stirring mechanism 18 to move is arranged on the top end of reaction kettle 1, stirring mechanism 18 and driving device 19 are in transmission fit with stirring mechanism 18 and comprise a stirring shaft and a stirring blade, the stirring shaft is rotatably arranged on reaction kettle 1, the stirring blade is fixedly arranged on the stirring shaft, driving device 19 comprises a driving motor and a speed reducer, the speed reducer is installed on reaction kettle 1, an input shaft of the speed reducer is connected with an output shaft of the driving motor, an output shaft of the speed reducer is connected with the stirring shaft, stirring mechanism 18 is matched with driving device 19 to stir a mixture in reaction kettle 1, and reaction speed is accelerated.
Referring to fig. 1, 3 and 4, the bottom end of the multiple separator 5 is connected to a collecting tank 20 through a pipeline, an eighth control valve 21 is installed on the pipeline between the collecting tank 20 and the collecting tank 20, a liquid level detector 22 is arranged in the collecting tank 20, the collecting tank 20 can collect water generated by the esterification reaction and monitor the water through the liquid level detector when the esterification reaction occurs, and the collecting tank 20 can collect ester completely reacted when the rectification reaction occurs; the reflux pipe 6 is provided with a flow meter 23, and the reflux pipe 6 can control the amount of the liquid ester entering the reaction tower 2 in the process of refluxing again.
Referring to fig. 1 and fig. 2, a dissolution discharge pipe 24 is opened at one end of the reaction tower 2 away from the reaction tank, a ninth control valve 25 is installed on the dissolution discharge pipe 24, and the ninth control valve 25 and the dissolution discharge pipe 24 are matched to discharge gaseous solvents during rectification, so that the esterification product has higher purity.
The implementation principle of the embodiment is as follows: adding organic acid, organic alcohol and a solvent into a reaction kettle 1, heating to enable esterification reaction to be carried out in the reaction kettle 1, closing a first control valve 7, a sixth control valve 16, a seventh control valve 17 and a ninth control valve 25, opening a second control valve 8, a third control valve 9, a fourth control valve 13, a fifth control valve 14 and an eighth control valve 21, enabling the organic alcohol and the organic acid to react in the reaction kettle 1, enabling gas generated by the reaction to pass through a reaction tower 2 and then a condenser 3 to be condensed into liquid, separating the gas in a single separator 4 and pumping out the gas through a vacuum pump 11, enabling the gas to be pumped out through the vacuum pump 11, enabling the water to enter a collecting box 20 through a pipeline, and enabling the liquid ester to flow back into the reaction kettle 1 again; the whole device can discharge water completely, reduce the time of esterification reaction through total reflux, and improve the purity of products; after the esterification is finished, the reaction kettle 1 is subjected to rectification reaction again, at the moment, ester and a solvent are remained in the reaction kettle 1, the solvent is cyclohexane, the boiling point of the ester is 180 ℃, the boiling point of the cyclohexane is 78 ℃, and the boiling point of the cyclohexane is lower than that of the ester; opening a ninth control valve 25, closing a first control valve 7, a second control valve 8, a third control valve 9, a fourth control valve 13, a fifth control valve 14, a sixth control valve 16, a seventh control valve 17 and an eighth control valve 21, heating the reaction kettle 1 to evaporate cyclohexane, discharging the cyclohexane through a discharge dissolving pipe 24, sending the cyclohexane into a tail gas treatment mechanism for treatment, after the cyclohexane is discharged completely, closing the ninth control valve 25, opening the first control valve 7, the second control valve 8, the sixth control valve 16 and the seventh control valve 17, heating the reaction kettle 1 again to evaporate ester into a gaseous state, liquefying the gaseous ester through a condenser 3, shunting part of liquid ester through a backflow pipe 6 to enter the reaction tower 2 again, cooling and protecting the reaction tower 2, sending the other part of liquid ester into a collection tank 15 for collection, circulating for multiple times until the rectification is finished, and pumping out gas in the collection tank 15 by a vacuum pump 11, negative pressure is formed in the collecting tank 15, and the liquid esterified substance is efficiently collected in the collecting tank 15 under the action of the negative pressure; whole device utilizes the difference of boiling point to draw the ester, refines simply fast, and the refluence makes the interior gas-liquid exchange of tower once more, can also protection device esterifies and rectification reaction through same container, has improved the efficiency of refining of product, makes simultaneously esterify and go on in the shared reaction tower 2 of rectification, reduces the cost that equipment made.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (10)
1. The utility model provides an esterify and integrated reaction unit of rectification which characterized in that: comprises a reaction kettle (1), wherein the top end of the reaction kettle (1) is provided with a reaction tower (2), one end of the reaction kettle (1) which is kept away from by the reaction tower (2) is communicated with a condenser (3) through a pipeline, the condenser (3) is communicated with a single separator (4) through a pipeline, the single separator (4) is communicated with a multiple separator (5) through a pipeline, the multiple separator (5) is connected into the reaction kettle (1) through a pipeline, one end of the single separator (4) is provided with a return pipe (6), the return pipe (6) is connected into the inner part of one end of the reaction kettle (1) which is kept away from by the reaction tower (2), the return pipe (6) is provided with a first control valve (7), the pipeline which is mutually communicated with the multiple separator (5) and the single separator (4) is provided with a second control valve (8), and a third control valve (9) is arranged on a pipeline which is communicated with the multiple separator (5) and the reaction kettle (1).
2. The esterification and rectification integrated reaction device according to claim 1, characterized in that: the reflux pipe (6) is located one end in the reaction tower (2) is provided with a spray head (10), the installation height of the condenser (3) is higher than that of the single separator (4), the installation height of the single separator (4) is higher than that of the spray head (10), the installation height of the spray head (10) is higher than that of the multiple separator (5), and the installation height of the multiple separator (5) is higher than that of the reaction kettle (1).
3. The esterification and rectification integrated reaction device according to claim 1, characterized in that: one end of each of the single separator (4) and the multiple separators (5) is communicated with a vacuum pump (11) through a pipeline.
4. The esterification and rectification integrated reaction device according to claim 3, characterized in that: a vacuum tank (12) is arranged between the single separator (4) and the multiple separators (5) and the vacuum pump (11).
5. The esterification and rectification integrated reaction device according to claim 4, characterized in that: a fourth control valve (13) is arranged between the single separator (4) and the vacuum pump (11), and a fifth control valve (14) is arranged between the multiple separators (5) and the vacuum pump (11).
6. The esterification and rectification integrated reaction device according to claim 5, characterized in that: multiple separator (5) have holding vessel (15) through the pipe connection, holding vessel (15) pass through pipeline intercommunication vacuum tank (12), install sixth control valve (16) on the pipeline between multiple separator (5) and holding vessel (15), install seventh control valve (17) on the pipeline between holding vessel (15) and vacuum tank (12).
7. The esterification and rectification integrated reaction device according to claim 1, characterized in that: stirring mechanism (18) is arranged in reaction kettle (1) rotation, reaction kettle (1) top is provided with drive mechanism (18) the drive arrangement (19) of motion, stirring mechanism (18) with drive arrangement (19) transmission fit.
8. The esterification and rectification integrated reaction device according to claim 1, characterized in that: the bottom end of the multiple separator (5) is connected with a collecting box (20) through a pipeline, an eighth control valve (21) is installed on the pipeline between the collecting box (20) and the collecting box (20), and a liquid level detector (22) is arranged in the collecting box (20).
9. The esterification and rectification integrated reaction device according to claim 1, characterized in that: the return pipe (6) is provided with a flowmeter (23).
10. The esterification and rectification integrated reaction device according to claim 1, characterized in that: one end of the reaction tower (2) far away from the reaction tank is provided with a solution discharge pipe (24), and a ninth control valve (25) is installed on the solution discharge pipe (24).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921597636.3U CN210846370U (en) | 2019-09-24 | 2019-09-24 | Esterification and rectification integrated reaction device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921597636.3U CN210846370U (en) | 2019-09-24 | 2019-09-24 | Esterification and rectification integrated reaction device |
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| CN210846370U true CN210846370U (en) | 2020-06-26 |
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