CN115532190A - Continuous esterification reaction device and method - Google Patents

Abstract

The invention relates to the technical field of esterification reaction, and particularly discloses a continuous esterification reaction device, which comprises: the device comprises a static mixer, a main material storage box, an auxiliary material storage box, an esterification kettle, a reactant storage box and a tail gas neutralizing barrel, wherein the top of the main material storage box is connected with a first conveying channel, the top of the auxiliary material storage box is connected with a second conveying channel, one ends of the first conveying channel and the second conveying channel are respectively provided with a heating cylinder, a conveying mechanism comprises a spiral auger arranged in the first conveying channel and the second conveying channel, and a chromium block with a rough surface is arranged on the outer wall of the spiral auger.

Description

Continuous esterification reaction device and method

Technical Field

The invention relates to the technical field of esterification reaction, in particular to a continuous esterification reaction device and a continuous esterification reaction method.

Background

Esterification is a kind of organic chemical reaction, mainly is the reaction of alcohol and carboxylic acid or inorganic oxyacid to produce ester and water. The esterification reaction of carboxylic acid and alcohol is reversible and is generally very slow, so concentrated sulfuric acid is commonly used as a catalyst, the reaction of polycarboxylic acid and alcohol can generate various esters, the reaction of inorganic strong acid and alcohol is generally fast, the typical esterification reaction comprises the reaction of ethanol and acetic acid to generate acetic acid with aromatic odor, most of the esterification reactions are carried out in a reaction kettle, the reaction kettle is heated by a jacket and is provided with a stirring mixed material, the water generated by the esterification reaction is removed by an entrainer, and the batch feeding and discharging are carried out.

Patent CN202366684U discloses a continuous esterification reaction kettle, in which the materials are mixed in a stirring kettle and then pumped into a reaction elbow in the esterification kettle by a metering pump for reaction, and heat conducting oil is introduced into the esterification kettle to heat the reaction elbow in the kettle. Because esterification reaction will absorb the heat, reaction temperature is higher, and esterification reaction rate is faster, therefore needs to heat reation kettle, and the device lacks heating element when using, and then leads to stirring efficiency lower.

Therefore, we propose a continuous esterification apparatus and method to solve the above problems.

Disclosure of Invention

The invention aims to provide a continuous esterification reaction device and a continuous esterification reaction method, and aims to solve the problems that a reaction kettle needs to be heated because the esterification reaction needs to absorb heat, the higher the reaction temperature is, the faster the esterification reaction rate is, and the stirring efficiency is lower because a heating component is lacked when the device is used.

In order to achieve the purpose, the invention provides the following technical scheme:

in a first aspect, the present invention provides a continuous esterification apparatus comprising: the device comprises a static mixer, a main material storage box, an auxiliary material storage box, an esterification kettle, a reactant storage box and a tail gas neutralizing barrel, wherein the top of the main material storage box is connected with a first conveying channel through a feeding pipe, the top of the auxiliary material storage box is connected with a second conveying channel through a feeding pipe, and one ends of the first conveying channel and the second conveying channel are respectively provided with a heating cylinder;

the conveying mechanism is used for conveying materials in the main material storage box and the auxiliary material storage box and comprises a spiral auger arranged in a first conveying channel and a second conveying channel, and chromium blocks with rough surfaces are arranged on the outer wall of the spiral auger;

heating mechanism for preheat the material in main ingredient storage tank and the auxiliary material storage tank, improve reaction efficiency, including setting up the heat-conducting layer on the cartridge heater inner wall, equidistant a plurality of heating pipes, every of being provided with on the inner wall of heat-conducting layer all be equipped with heating resistor silk, every on the outer wall of heating pipe the outside of heating resistor silk all is connected with the steam pipe.

In further embodiment, bottom one side of static mixer is connected with top one side of the cauldron of esterifying through the conveying pipeline, the inside of the cauldron of esterifying is including first reation kettle chamber and second reation kettle chamber, first reation kettle chamber sets up in second reation kettle chamber top, be provided with the defeated material passageway between first reation kettle chamber and the second reation kettle chamber, the outer wall winding of defeated material passageway is provided with spiral heating pipe.

In a further embodiment, a heat conducting block is arranged between every two adjacent heating pipes, and one end of each heat conducting block is connected with the outer wall of the steam pipe.

In a further embodiment, a condenser is arranged at the top of the static mixer, a control panel is arranged on one side of the static mixer, and electric stirrers are arranged on the inner top of the first reaction kettle cavity and the inner side wall of the second reaction kettle cavity.

In a further embodiment, a plurality of heat exchange channels are formed in one end of each of the first conveying channel and the second conveying channel, a copper wire ring is arranged at the bottom of each heat exchange channel, a chromium plate with a rough surface is fixedly connected to the bottom of each copper wire ring, and the chromium plate is in contact with a chromium block.

In a further embodiment, driving motors are arranged at one ends of the tops of the first conveying channel and the second conveying channel, the output ends of the driving motors penetrate through the rotating shafts and extend into the first conveying channel and the second conveying channel to be fixedly connected with driving bevel gears, the bottoms of the driving bevel gears are connected with driven bevel gears in a meshed mode, and the driven bevel gears are connected with the spiral auger through the rotating shafts.

In a further embodiment, a heat conduction pipe is arranged in the heat exchange channel, an air inlet channel is formed in one end of the heating cylinder, the cross section of the air inlet channel is in an L-shaped arrangement, and one end of the heat conduction pipe is connected with the air inlet channel.

In a further embodiment, the top of tail gas neutralization bucket is provided with the air exhauster, the input of air exhauster is connected with top one side of esterifying the cauldron through the air duct, the output of air exhauster is connected with the gas-supply pipe, the one end of gas-supply pipe runs through and extends to tail gas in and the bucket in-connection has the purifying tube, the cross sectional shape of purifying tube is the setting of multistage U type structure, equidistant a plurality of bleeder vents of having seted up on the outer wall of purifying tube, the purifying tube extends to the tail gas in and the bucket one end be the enclosed construction, the inside of tail gas neutralization bucket is provided with tail gas neutralization liquid, the one end top of tail gas neutralization bucket is provided with the air discharge cover, the one end fixedly connected with blast pipe of air discharge cover, the blast pipe runs through to extend to the tail gas in and the bucket outer one end is connected with the ooff valve.

In a further embodiment, the inside of the reactant storage bin is provided with a screening barrel, the inside of the screening barrel is sequentially provided with a first screening frame, a second screening frame and a third screening frame from top to bottom, and the screening mesh diameters of the first screening frame, the second screening frame and the third screening frame are gradually reduced.

In a second aspect, the invention also provides a continuous esterification method, which comprises the following specific steps:

the method comprises the following steps: firstly, conveying quantitative main materials into a static mixer through a first conveying channel and a second conveying channel respectively by the main materials in a main material storage box and the auxiliary materials in an auxiliary material storage box;

step two: then in the conveying process, the output end of a driving motor drives a driving bevel gear to rotate through a rotating shaft, the driving bevel gear is meshed to drive a driven bevel gear to rotate, the driven bevel gear rotates to drive a spiral auger to rotate through the rotating shaft to convey materials, meanwhile, chromium blocks on the outer wall of the spiral auger, which are rough in surface, rub with chromium plates, which are rough in surface, to generate heat, the heat sequentially passes through a copper wire ring, a heat exchange channel, a heat conduction pipe and an air inlet channel to reach a steam pipe, and meanwhile, main materials and auxiliary materials are preheated through the heat conduction layer, a heating pipe and a heating resistance wire;

step three: condensing the gas from the top of the static mixer by a condenser, simultaneously feeding the non-condensable gas into the esterification kettle, and finally feeding the non-condensable gas into a tail gas neutralizing barrel for neutralization;

step four: firstly, the product mixed by the static mixer enters a first reaction kettle cavity and is mixed again by an electric stirrer, the mixed product is heated by a spiral heating pipe in a material conveying channel, the reaction temperature is kept, and then the mixed product enters a second reaction kettle cavity and is mixed again by the electric stirrer;

step five: finally, conveying the obtained product to a screening barrel in a reactant storage tank, and then sequentially screening and filtering the product through a first screening screen frame, a second screening screen frame and a third screening screen frame to obtain reaction products with different volumes;

step six: the exhaust fan carries the waste gas that noncondensable gas and reaction produced to the purge tube in, then reacts with tail gas neutralization liquid through a plurality of bleeder vents on the purge tube outer wall and neutralizes, and at last through opening the ooff valve, through exhaust hood and blast pipe discharge can.

Compared with the prior art, the invention has the beneficial effects that:

firstly, the spiral auger, the rough-surface chromium block, the rough-surface chromium plate, the heat conduction layer, the heating pipe, the heating resistance wire and the steam pipe are matched with one another, so that heat can be effectively generated through friction in the conveying process, the heat is conveyed into the heating cylinder to preheat materials, and the stirring efficiency is improved;

secondly, the exhaust fan, the gas pipe, the purification pipe, the air holes and the tail gas neutralizing liquid are arranged, so that the waste gas and the tail gas generated in the reaction process can be effectively and uniformly neutralized;

thirdly, according to the invention, reaction products with different volumes can be obtained according to requirements by arranging the first screening screen frame, the second screening screen frame and the third screening screen frame, and the subsequent screening time is saved.

Drawings

FIG. 1 is a schematic structural view of a continuous esterification apparatus and method;

FIG. 2 is a schematic view of the conveying mechanism according to the present invention;

FIG. 3 is a schematic view showing the internal structure of a second conveyance path according to the present invention;

FIG. 4 is a schematic view showing an internal structure of a heating cartridge according to the present invention;

FIG. 5 is a schematic view showing the internal structure of the static mixer of the present invention;

FIG. 6 is a schematic view showing the internal structure of the reactant storage tank according to the present invention;

FIG. 7 is a schematic view showing the internal structure of the off-gas neutralizing tank according to the present invention;

FIG. 8 is an enlarged view of the structure at A in the present invention.

In the figure: 1. a static mixer; 2. a main material storage box; 3. an auxiliary material storage box; 4. an esterification kettle; 5. a reactant storage tank; 6. a tail gas neutralizing tank; 7. a first conveyance path; 8. a second conveyance path; 9. a drive motor; 10. heating resistance wires; 11. a heating cylinder; 12. a heat conducting pipe; 13. a condenser; 14. a control panel; 15. an exhaust fan; 16. a gas delivery pipe; 17. a purge tube; 18. air holes are formed; 19. an exhaust hood; 20. an exhaust pipe; 21. an on-off valve; 22. a first reaction vessel cavity; 23. a second reaction kettle cavity; 24. a material conveying channel; 25. a spiral heating pipe; 26. an electric stirrer; 27. a screening barrel; 28. a first screen frame; 29. a second screen frame; 30. a third screen frame; 31. a drive bevel gear; 32. a driven bevel gear; 33. a spiral auger; 34. a chromium block; 35. a chromium plate; 36. a copper wire loop; 37. a heat exchange channel; 38. an intake passage; 39. heating a tube; 40. a heat conducting block; 41. a steam pipe; 42. a thermally conductive layer.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1-8, in an embodiment of the present invention, a continuous esterification apparatus includes: the device comprises a static mixer 1, a main material storage box 2, an auxiliary material storage box 3, an esterification kettle 4, a reactant storage box 5 and a tail gas neutralization barrel 6, wherein the top of the main material storage box 2 is connected with a first conveying channel 7 through a feeding pipe, the top of the auxiliary material storage box 3 is connected with a second conveying channel 8 through a feeding pipe, and heating barrels 11 are arranged at one ends of the first conveying channel 7 and the second conveying channel 8;

the conveying mechanism is used for conveying materials in the main material storage box 2 and the auxiliary material storage box 3 and comprises a spiral auger 33 arranged in a first conveying channel 7 and a second conveying channel 8, and a chromium block 34 with a rough surface is arranged on the outer wall of the spiral auger 33;

heating mechanism for preheat the material in main ingredient storage tank 2 and the auxiliary material storage tank 3, improve reaction efficiency, including setting up the heat-conducting layer 42 on heating cylinder 11 inner wall, the equidistant a plurality of heating pipes 39 that are provided with of inner wall of heat-conducting layer 42, every all be equipped with heating resistor silk 10 on the outer wall of heating pipe 39, every the outside of heating resistor silk 10 all is connected with steam pipe 41.

Further, in the above technical scheme, bottom one side of static mixer 1 is connected with top one side of esterification reaction kettle 4 through the conveying pipeline, esterification reaction kettle 4's inside is including first reation kettle cavity 22 and second reation kettle cavity 23, first reation kettle cavity 22 sets up in second reation kettle cavity 23 top, be provided with defeated material passageway 24 between first reation kettle cavity 22 and the second reation kettle cavity 23, the outer wall winding of defeated material passageway 24 is provided with spiral heating pipe 25.

Further, in the above technical solution, a heat conduction block 44 is disposed between each two adjacent heating pipes 39, and one end of each heat conduction block 44 is connected to an outer wall of the steam pipe 41.

Further, in the above technical solution, a condenser 13 is disposed at the top of the static mixer 1, a control panel 14 is disposed at one side of the static mixer 1, and electric stirrers 26 are disposed at the inner top of the first reaction kettle cavity 22 and the inner side wall of the second reaction kettle cavity 23.

Further, in the above technical solution, a plurality of heat exchange channels 37 are respectively opened at one end of the first conveying channel 7 and one end of the second conveying channel 8, a copper wire ring 36 is arranged at the bottom of each heat exchange channel 37, a chromium plate 35 with a rough surface is fixedly connected to the bottom of each copper wire ring 36, and the chromium plate 35 is in contact with the chromium block 34.

Further, in the above technical scheme, the driving motors 9 are respectively arranged at one ends of the tops of the first conveying channel 7 and the second conveying channel 8, the output ends of the driving motors 9 penetrate through the rotating shafts and extend into the first conveying channel 7 and the second conveying channel 8 to be fixedly connected with the driving bevel gears 31, the bottoms of the driving bevel gears 31 are connected with the driven bevel gears 32 in a meshed mode, the driven bevel gears 32 are connected with the spiral auger 33 through the rotating shafts, the heat transfer channels are internally provided with the heat conduction pipes 12, one ends of the heating cylinders 11 are provided with the air inlet channels 38, the cross sections of the air inlet channels 38 are arranged in an L shape, and one ends of the heat conduction pipes 12 are connected with the air inlet channels 38.

Further, in the above technical scheme, the top of tail gas neutralization bucket 6 is provided with air exhauster 15, the input of air exhauster 15 is connected with top one side of esterification reaction kettle 4 through the air duct, the output of air exhauster 15 is connected with gas-supply pipe 16, the one end of gas-supply pipe 16 runs through to extend to tail gas neutralization bucket 6 in-connection has purifying tube 17, purifying tube 17's cross-sectional shape is the setting of multistage U type structure, a plurality of bleeder vents 18 have been seted up to equidistant on the outer wall of purifying tube 17, the one end that purifying tube 17 extends to in the tail gas neutralization bucket 6 is seal structure, the inside of tail gas neutralization bucket 6 is provided with tail gas neutralization liquid, the one end top of tail gas neutralization bucket 6 is provided with air exhaust hood 19, the one end fixedly connected with blast pipe 20 of air exhaust hood 19, the one end that blast pipe 20 runs through to extend to in the tail gas neutralization bucket 6 is connected with ooff valve 21, through the effect that has set up air exhauster 15, gas-supply pipe 16, purifying tube 17, bleeder vent 18 and tail gas neutralization liquid to can effectually carry out the waste gas that the reaction in-process and unify the neutralization treatment.

Further, in the above technical scheme, the inside of reactant bin 5 is provided with screening bucket 27, the inside from the top down of screening bucket 27 has set gradually first screening screen frame 28, second screening screen frame 29 and third screening screen frame 30, the screening mesh diameter of first screening screen frame 28, second screening screen frame 29 and third screening screen frame 30 reduces gradually, through having set up first screening screen frame 28, second screening screen frame 29 and third screening screen frame 30 to can obtain the reaction product of different volumes according to the demand, save follow-up screening time.

Example 2

Referring to fig. 1-8, a continuous esterification process includes the following steps:

the method comprises the following steps: firstly, conveying the main materials in the main material storage box 2 and the auxiliary materials in the auxiliary material storage box 3 into the static mixer 1 in a quantitative manner through a first conveying channel 7 and a second conveying channel 8 respectively;

step two: then, in the conveying process, the output end of the driving motor 9 drives the driving bevel gear 31 to rotate through the rotating shaft, the driving bevel gear 31 is meshed in a rotating mode to drive the driven bevel gear 32 to rotate, the driven bevel gear 32 rotates to drive the spiral auger 33 to rotate through the rotating shaft to convey materials, meanwhile, the rough-surface chromium blocks 34 on the outer wall of the spiral auger 33 rub against the rough-surface chromium plate 35 to generate heat, the heat sequentially passes through the copper wire ring 36, the heat exchange channel 37, the heat conduction pipe 12 and the air inlet channel 38 to reach the steam pipe 41, and meanwhile, the main material and the auxiliary material are preheated through the heat conduction layer 40, the heating pipe 39 and the heating resistance wire 10;

step three: gas from the top of the static mixer 1 is condensed by a condenser 13, and simultaneously non-condensable gas enters the esterification kettle 4 and finally enters the tail gas neutralizing barrel 6 for neutralization;

step four: firstly, the products mixed by the static mixer 1 enter the first reaction kettle cavity 22 to be mixed again by the electric stirrer 26, the mixed products are heated by the spiral heating pipe 25 in the material conveying channel 24 to keep the reaction temperature, and then enter the second reaction kettle cavity 23 to be mixed again by the electric stirrer 26;

step five: finally, conveying the obtained product to a screening barrel 27 in the reactant storage tank 5, and then sequentially screening and filtering the product through a first screening screen frame 28, a second screening screen frame 29 and a third screening screen frame 30 to obtain reaction products with different volumes;

step six: the exhaust fan 15 conveys the non-condensable gas and the waste gas generated by the reaction into the purification pipe 17, then the non-condensable gas and the waste gas are reacted and neutralized with the tail gas neutralizing liquid through a plurality of air holes 18 on the outer wall of the purification pipe 17, and finally the reaction product is discharged through an exhaust hood 19 and an exhaust pipe 20 by opening a switch valve 21.

The working principle of the invention is as follows:

firstly, the main material in the main material storage box 2 and the auxiliary material in the auxiliary material storage box 3 are respectively conveyed into the static mixer 1 through a first conveying channel 7 and a second conveying channel 8 for quantitative main material, then, in the conveying process, the output end of a driving motor 9 drives a driving bevel gear 31 to rotate through a rotating shaft, the driving bevel gear 31 is rotationally meshed to drive a driven bevel gear 32 to rotate, the driven bevel gear 32 rotates to drive a spiral auger 33 to rotate through the rotating shaft for conveying, meanwhile, a rough-surface chromium block 34 on the outer wall of the spiral auger 33 and a rough-surface chromium plate 35 generate heat through friction, the heat sequentially passes through a copper wire ring 36, a heat exchange channel, a heat conduction pipe 12 and an air inlet channel 38 to reach a steam pipe 41, the main material and the auxiliary material are preheated through a heat conduction layer 42, a heating pipe 39 and a heating resistance wire 10, the gas from the top of the static mixer 1 is condensed through a condenser 13, the non-condensable gas enters an esterification kettle 4 and finally enters an exhaust gas neutralizing barrel 6, the product mixed by a first reaction kettle cavity 22 and is mixed by an electric stirrer 26, the main material is further mixed by a spiral switch 24, the product is conveyed to a second reaction kettle frame 23, the exhaust gas purification reaction product screening tank, the exhaust gas is filtered by a second exhaust gas purification screen, the exhaust gas screening tank 17, the exhaust gas screening tank is obtained by a third exhaust gas screening tank 17, the exhaust gas screening tank 17, the exhaust gas screening tank is obtained by a exhaust gas screening reaction product screening tank, the exhaust gas screening tank 17, the exhaust gas screening tank 23 and a exhaust gas screening tank 23, and discharged through the exhaust hood 19 and the exhaust pipe 20.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.

Claims (10)

1. A continuous esterification reaction apparatus, comprising:

the device comprises a static mixer (1), a main material storage box (2), an auxiliary material storage box (3), an esterification kettle (4), a reactant storage box (5) and a tail gas neutralization barrel (6), wherein the top of the main material storage box (2) is connected with a first conveying channel (7) through a feeding pipe, the top of the auxiliary material storage box (3) is connected with a second conveying channel (8) through a feeding pipe, and heating barrels (11) are arranged at one ends of the first conveying channel (7) and the second conveying channel (8);

the conveying mechanism is used for conveying materials in the main material storage box (2) and the auxiliary material storage box (3), and comprises a spiral auger (33) arranged in a first conveying channel (7) and a second conveying channel (8), and a chromium block (34) with a rough surface is arranged on the outer wall of the spiral auger (33);

heating mechanism for preheat the material in main ingredient storage tank (2) and auxiliary material storage tank (3), improve reaction efficiency, including heat-conducting layer (42) of setting on cartridge heater (11) inner wall, equidistant a plurality of heating pipes (39) that are provided with on the inner wall of heat-conducting layer (42), every all be equipped with heating resistor silk (10) on the outer wall of heating pipe (39), every the outside of heating resistor silk (10) all is connected with steam pipe (41).

2. The continuous esterification apparatus according to claim 1, wherein the bottom side of the static mixer (1) is connected to the top side of the esterification kettle (4) through a feed delivery pipe, the esterification kettle (4) comprises a first reaction kettle cavity (22) and a second reaction kettle cavity (23), the first reaction kettle cavity (22) is disposed above the second reaction kettle cavity (23), a feed delivery channel (24) is disposed between the first reaction kettle cavity (22) and the second reaction kettle cavity (23), and the outer wall of the feed delivery channel (24) is wound with a spiral heating pipe (25).

3. The continuous esterification apparatus according to claim 1, wherein a heat conduction block (44) is provided between each adjacent two of the heating pipes (39), and one end of each heat conduction block (44) is connected to an outer wall of the steam pipe (41).

4. A continuous esterification reaction apparatus according to claim 3, wherein a condenser (13) is disposed on the top of the static mixer (1), a control panel (14) is disposed on one side of the static mixer (1), and electric stirrers (26) are disposed on the inner top of the first reaction vessel cavity (22) and the inner side wall of the second reaction vessel cavity (23).

5. The continuous esterification reaction device according to claim 1, wherein one end of each of the first conveying channel (7) and the second conveying channel (8) is provided with a plurality of heat exchange channels (37), the bottom of each heat exchange channel (37) is provided with a copper wire loop (36), the bottom of each copper wire loop (36) is fixedly connected with a chromium plate (35) with a rough surface, and the chromium plate (35) is in contact with a chromium block (34).

6. The continuous esterification reaction device according to claim 1, wherein a driving motor (9) is disposed at one end of the top of each of the first conveying passage (7) and the second conveying passage (8), an output end of the driving motor (9) extends into the first conveying passage (7) and the second conveying passage (8) through a rotating shaft, a driving bevel gear (31) is fixedly connected to the inside of the first conveying passage (7) and the second conveying passage (8), a driven bevel gear (32) is engaged and connected to the bottom of the driving bevel gear (31), and the driven bevel gear (32) is connected to the spiral auger (33) through a rotating shaft.

7. A continuous esterification reaction device according to claim 5, wherein a heat pipe (12) is disposed in the heat exchange passage, an air inlet passage (38) is opened at one end of the heating cylinder (11), the cross section of the air inlet passage (38) is formed in an L shape, and one end of the heat pipe (12) is connected to the air inlet passage (38).

8. The continuous esterification reaction device according to claim 1, wherein an exhaust fan (15) is arranged at the top of the tail gas neutralization barrel (6), the input end of the exhaust fan (15) is connected with one side of the top of the esterification kettle (4) through an air duct, the output end of the exhaust fan (15) is connected with an air pipe (16), one end of the air pipe (16) penetrates through the tail gas neutralization barrel (6) and is connected with a purification pipe (17), the cross-sectional shape of the purification pipe (17) is in a multi-section U-shaped structure, a plurality of air holes (18) are formed in the outer wall of the purification pipe (17) at equal intervals, one end of the purification pipe (17) extending into the tail gas neutralization barrel (6) is of a sealing structure, tail gas neutralization liquid is arranged inside the tail gas neutralization barrel (6), an exhaust hood (19) is arranged at the top of one end of the tail gas neutralization barrel (6), an exhaust pipe (20) is fixedly connected with an exhaust pipe (20), and one end of the exhaust pipe (20) penetrating through the tail gas neutralization barrel (6) is connected with a switch valve (21).

9. A continuous esterification reaction apparatus according to claim 1, wherein the reactant storage tank (5) is provided with a screen barrel (27) inside, the screen barrel (27) is provided with a first screen frame (28), a second screen frame (29) and a third screen frame (30) inside from top to bottom, and the screen mesh diameters of the first screen frame (28), the second screen frame (29) and the third screen frame (30) are gradually reduced.

10. The continuous esterification apparatus according to any one of claims 1 to 9, comprising the steps of:

the method comprises the following steps: firstly, conveying quantitative main materials into a static mixer (1) through a first conveying channel (7) and a second conveying channel (8) respectively by the main materials in a main material storage box (2) and the auxiliary materials in an auxiliary material storage box (3);

step two: then in the conveying process, the output end of a driving motor (9) drives a driving bevel gear (31) to rotate through a rotating shaft, the driving bevel gear (31) is meshed to drive a driven bevel gear (32) to rotate, the driven bevel gear (32) rotates to drive a spiral auger (33) to rotate through the rotating shaft to convey materials, meanwhile, a chromium block (34) with a rough surface on the outer wall of the spiral auger (33) rubs with a chromium plate (35) with a rough surface to generate heat, the heat sequentially passes through a copper wire ring (36), a heat exchange channel (37), a heat conduction pipe (12) and an air inlet channel (38) to reach a steam pipe (41), and meanwhile, the main material and the auxiliary material are preheated through a heat conduction layer (42), a heating pipe (39) and a heating resistance wire (10);

step three: after the gas from the top of the static mixer (1) is condensed by a condenser (13), simultaneously the non-condensable gas enters the esterification kettle (4) and finally enters a tail gas neutralizing barrel (6) for neutralization;

step four: firstly, products mixed by a static mixer (1) enter a first reaction kettle cavity (22) and are mixed again by an electric stirrer (26), the mixed products are heated by a spiral heating pipe (25) in a material conveying channel (24) to keep the reaction temperature, and then the mixed products enter a second reaction kettle cavity (23) and are mixed again by the electric stirrer (26);

step five: finally, the obtained product is conveyed into a screening barrel (27) in the reactant storage tank (5), and then is screened and filtered by a first screening screen frame (28), a second screening screen frame (29) and a third screening screen frame (30) in sequence to obtain reaction products with different volumes;

step six: the exhaust fan (15) conveys the non-condensable gas and the waste gas generated by reaction into the purification pipe (17), then the non-condensable gas and the waste gas are reacted and neutralized with the tail gas neutralizing liquid through a plurality of air holes (18) on the outer wall of the purification pipe (17), and finally the reaction product is discharged through the exhaust hood (19) and the exhaust pipe (20) by opening the switch valve (21).

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