Permanent violet alkylation device capable of stably dropwise adding bromoethane

Abstract

The utility model provides a permanent violet alkylation device capable of stably dropwise adding bromoethane, which relates to the technical field of permanent violet preparation systems and comprises a reaction kettle, a stable feeding component and a liquid caustic soda elevated tank, a feeding port is further arranged on the reaction kettle, the stable feeding component comprises a bromoethane storage part, a conveying part and a feeding pipe, and a cooling coil is arranged outside the bromoethane storage part. An outlet of the liquid caustic soda head tank is connected with an inlet of the reaction kettle, an outlet of the bromoethane storage part is connected with an inlet of the conveying part, an outlet of the conveying part is connected with an inlet of the feeding pipe, the feeding pipe is connected with the reaction kettle, and the bottom of the feeding pipe is located at the lower part of the reaction kettle; during alkylation reaction, bromoethane is cooled through the cooling coil outside the bromoethane storage part, bromoethane gasification is avoided, then liquid-phase bromoethane is stably and dropwise added and conveyed to the bottom of the liquid phase in the reaction kettle through the conveying part and the feeding pipe, and the situation that the bromoethane cannot be added into the reaction kettle due to pressure rise in the reaction kettle, so that the reaction kettle is more stable is avoided. The alkylation reaction yield is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of permanent violet preparation system, concretely relates to a kind of permanent violet alkylation device of stable droping bromoethane. BACKGROUND

[0002] Permanent violet crude product is alkylated in the process, carbazole is used as starting material, carbazole is dissolved in lye and then refluxed droping bromoethane to obtain N-ethylcarbazole;If prior art, the Chinese utility model with application number 202320981935.7 discloses a kind of permanent violet alkylation separation system, the patent discloses that liquid caustic, carbazole and catalyst are added to reaction kettle by liquid caustic high tank, carbazole high tank and catalyst storage tank, and the reaction kettle is heated to 75-80 DEG C, then refluxed droping bromoethane to generate N-ethylcarbazole by alkylating reaction, the patent is in early stage, bromoethane high tank and the height difference of reaction kettle, bromoethane can be self-flowing into reaction kettle to prepare N-ethylcarbazole, but the boiling point of bromoethane is only 37 DEG C, when the temperature in reaction kettle rises to 85 DEG C, bromoethane in reaction kettle is gasified, the pressure in reaction kettle rises, so that bromoethane cannot be added to reaction kettle, causing low reaction yield. SUMMARY

[0003] Therefore, the utility model provides a kind of permanent violet alkylation device of stable droping bromoethane to improve reaction yield.

[0004] A kind of permanent violet alkylation device of stable droping bromoethane, including reaction kettle, stable feeding assembly, liquid caustic high tank, the feeding port is also provided on the reaction kettle, the stable feeding assembly includes bromoethane storage, conveying part, feeding pipe, the outside of the bromoethane storage is provided with cooling coil, the outlet of the liquid caustic high tank is connected with the inlet of the reaction kettle, the outlet of the bromoethane storage is connected with the inlet of the conveying part, the outlet of the conveying part is connected with the inlet of the feeding pipe, the feeding pipe is connected with the reaction kettle, the bottom of the feeding pipe is located in the lower part of the reaction kettle, to make the liquid in the bromoethane storage stable conveying to the reaction kettle.

[0005] Preferably, the conveying part includes control, vacuum pipe, vacuum pump, the bromoethane storage is bromoethane high tank, the bottom outlet of the bromoethane high tank is connected with one end of the control, the other end of the control is connected with the inlet of the feeding pipe, one end of the vacuum pipe is connected with the reaction kettle, the other end of the vacuum pipe is connected with the vacuum pump.

[0006] Preferably, the control is regulating valve.

[0007] Preferably, the conveying part is a metering pump, the inlet of which is connected with the bottom outlet of the bromoethane storage part, and the outlet of which is connected with the inlet of the feeding pipe.

[0008] Preferably, the outlet of the metering pump is connected with the inlet of the bromoethane storage part, a first valve is arranged on the pipeline connecting the outlet of the metering pump with the inlet of the feeding pipe, and a second valve is arranged on the pipeline connecting the outlet of the metering pump with the inlet of the bromoethane storage part.

[0009] Preferably, the application further comprises a recovery unit, which comprises a condenser and a receiving tank, the material inlet of the condenser is connected with the top outlet of the reaction kettle, and the material outlet of the condenser is connected with the receiving tank.

[0010] Preferably, the material outlet of the condenser is further connected with the reflux inlet of the reaction kettle.

[0011] Preferably, a third valve is arranged on the pipeline connecting the material outlet of the condenser with the reflux inlet of the reaction kettle, and a fourth valve is arranged on the pipeline connecting the material outlet of the condenser with the receiving tank.

[0012] Preferably, the application further comprises a separation unit, which comprises an N-ethyl carbazole separation kettle and a chlorobenzene high tank, the inlet of the N-ethyl carbazole separation kettle is connected with the bottom outlet of the reaction kettle, and the raw material inlet of the N-ethyl carbazole separation kettle is connected with the outlet of the chlorobenzene high tank.

[0013] Preferably, a feeding pipe is arranged on the N-ethyl carbazole separation kettle, one end of the feeding pipe extends into the middle part of the N-ethyl carbazole separation kettle.

[0014] Compared with the prior art, the application has the beneficial effects that:

[0015] The utility model discloses a permanent violet alkylation device of stable drop of bromoethane, including reation kettle, stable feeding assembly component, liquid alkali high level tank, still be provided with feeding opening on the reation kettle, the stable feeding assembly component includes bromoethane storage spare, conveying portion, feeding pipe, the outside of bromoethane storage spare is provided with cooling coil, the outlet of liquid alkali high level tank with the inlet of reation kettle is connected, the outlet of bromoethane storage spare with the inlet of conveying portion is connected, the outlet of conveying portion with the inlet of feeding pipe is connected, the feeding pipe with reation kettle is connected, and the bottom of feeding pipe is located the lower part of reation kettle, when alkylation reaction, add liquid alkali in liquid alkali high level tank to reation kettle, then add carbazole, catalyst through feeding opening to reation kettle, then cool bromoethane through the cooling coil outside bromoethane storage spare, avoid bromoethane gasification, then the liquid phase bromoethane is conveyed to the liquid phase bottom in reation kettle through conveying portion and feeding pipe steady drop, avoid the high temperature in reation kettle to cause bromoethane gasification, cause waste, influence reaction yield, and through conveying portion and feeding pipe steady drop of bromoethane liquid, avoid because the pressure in reation kettle rises, bromoethane can not be added to reation kettle, make that alkylation reaction yield improves. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the block diagram of permanent violet alkylation device of stable drop of bromoethane.

[0017] Figure 2 It is process flow chart of permanent violet alkylation device of stable drop of bromoethane example one.

[0018] Figure 3 It is process flow chart of permanent violet alkylation device of stable drop of bromoethane example two.

[0019] Figure 4 It is the sectional view of control member.

[0020] Figure 5 It is process flow chart of permanent violet alkylation device of stable drop of bromoethane example three.

[0021] In the figure: the permenanet violet alkylating device 10 for stable dropwise adding bromoethane, the reaction kettle 100, the feeding port 110, the stable feeding assembly 200, the bromoethane storage 210, the second valve 211, the cooling coil 212, the conveying part 220, the control member 221, the connecting barrel 2211, the fixing plate 2212, the second lower liquid hole 22121, the sliding plate 2213, the first lower liquid hole 22131, the connecting block 2214, the moving rod 2215, the lifting plate 2216, the third lower liquid hole 22161, the spring 2217, the adsorption layer 2218, the vacuum pipe 222, the vacuum pump 223, the feeding pipe 230, the first valve 231, the liquid alkali head tank 300, the recovery unit 400, the condenser 410, the third valve 411, the fourth valve 412, the receiving tank 420, the separation unit 500, the N-ethyl carbazole separation kettle 510, the feeding pipe 511, the chlorobenzene head tank 520. DETAILED DESCRIPTION

[0022] The technical scheme and technical effects of the embodiments of the utility model are further described in detail below in combination with the drawings of the utility model.

[0023] Please refer to Figures 1 to 5 A permenanet violet alkylating device 10 for stable dropwise adding bromoethane, comprising a reaction kettle 100, a stable feeding assembly 200 and a liquid alkali head tank 300, wherein the reaction kettle 100 is additionally provided with a feeding port 110, the stable feeding assembly 200 comprises a bromoethane storage 210, a conveying part 220 and a feeding pipe 230, the bromoethane storage 210 is externally provided with a cooling coil 212, the outlet of the liquid alkali head tank 300 is connected with the inlet of the reaction kettle 100, the outlet of the bromoethane storage 210 is connected with the inlet of the conveying part 220, the outlet of the conveying part 220 is connected with the inlet of the feeding pipe 230, the feeding pipe 230 is connected with the reaction kettle 100, and the bottom of the feeding pipe 230 is located at the lower part of the reaction kettle 100, so that the liquid in the bromoethane storage 210 is stably conveyed into the reaction kettle 100.

[0024] Specifically, the cooling coil 212 is supplied with chilled water.

[0025] Compared with the prior art, the utility model has the beneficial effects that:

[0026] The utility model discloses permanent violet alkylation device 10 of bromoethane steady drop, including reation kettle 100, steady feeding assembly 200, liquid alkali high level tank 300, still be provided with feeding opening 110 on reation kettle 100, steady feeding assembly 200 includes bromoethane storage 210, conveying portion 220, feeding pipe 230, the outside of bromoethane storage 210 is provided with cooling coil 212, the outlet of liquid alkali high level tank 300 is connected with the entrance of reation kettle 100, the outlet of bromoethane storage 210 is connected with the entrance of conveying portion 220, the outlet of conveying portion 220 is connected with the entrance of feeding pipe 230, feeding pipe 230 is connected with reation kettle 100, and the bottom of feeding pipe 230 is located in the lower part of reation kettle 100, when alkylation reaction, the liquid alkali in liquid alkali high level tank 300 is added to reation kettle 100, then carbazole, catalyst is added to reation kettle 100 through feeding opening 110, then cooling coil 212 outside bromoethane storage 210 is used to cool bromoethane, avoids bromoethane gasification, then liquid phase bromoethane is steadily drop fed to the liquid phase bottom in reation kettle 100 through conveying portion 220 and feeding pipe 230, avoids that the high temperature in reation kettle 100 causes bromoethane gasification, causes waste, influences reaction yield, and the liquid bromoethane is steadily drop fed through conveying portion 220 and feeding pipe 230, avoids that the pressure in reation kettle 100 rises, and bromoethane cannot be added to reation kettle 100, makes alkylation reaction yield improve.

[0027] Further, because the boiling point of bromoethane is 37 DEG C, initially bromoethane can flow into by position difference, but during alkylation reaction, the highest temperature of reaction can rise to above 85 DEG C, liquid in reation kettle 100 evaporates, and the pressure in reation kettle 100 increases, leading to bromoethane cannot be added by self-flowing, therefore, conveying portion 220 includes control piece 221, vacuum pipe 222 and vacuum pump 223, bromoethane storage 210 is bromoethane high level tank, the bottom outlet of bromoethane high level tank is connected with one end of control piece 221, the other end of control piece 221 is connected with the entrance of feeding pipe 230, one end of vacuum pipe 222 is connected with reation kettle 100, and the other end of vacuum pipe 222 is connected with vacuum pump 223, negative pressure is extracted through vacuum pump 223, so that the pressure in reation kettle 100 is negative pressure, and the drop feeding rate of bromoethane is controlled through control piece 221, so that bromoethane liquid in bromoethane high level tank is normally added, and reaction is carried out.

[0028] Further, control piece 221 is regulating valve, and the adding rate of bromoethane is controlled, because alkylation reaction is exothermic, and the temperature in reation kettle 100 cannot be controlled too fast.

[0029] Further, the control member 221 comprises a connecting cylinder 2211, a fixed plate 2212, a sliding plate 2213, a connecting block 2214, a moving rod 2215, the sliding plate 2213 is uniformly provided with first lower liquid holes 22131, the fixed plate 2212 is uniformly provided with second lower liquid holes 22121, the diameter of the sliding plate 2213 is smaller than that of the fixed plate 2212, the sliding plate 2213 is located above the fixed plate 2212, the inlet of the connecting cylinder 2211 is connected with the outlet at the bottom of the bromoethane high tank through a pipeline, the outlet of the connecting cylinder 2211 is connected with the inlet of the feeding pipe 230 through a pipeline, the upper portion of the sliding plate 2213 is connected with the connecting block 2214, one end of the moving rod 2215 is a free end, the other end of the moving rod 2215 penetrates through the side wall of the connecting cylinder 2211 and is connected with the connecting block 2214, so that the sliding plate 2213 can move horizontally, by pulling the moving rod 2215, the connecting block 2214 drives the sliding plate 2213 to move horizontally, so that the first lower liquid holes 22131 are close to the second lower liquid holes 22121 and the dropping speed is controlled.

[0030] Further, the control member 221 further comprises a lifting plate 2216, a spring 2217 and an adsorption layer 2218, the lifting plate 2216 is uniformly provided with third lower liquid holes 22161, the lifting plate 2216 is located below the sliding plate 2213 and above the fixed plate 2212, the adsorption layer 2218 and the spring 2217 are located between the lifting plate 2216 and the fixed plate 2212, the spring 2217 is located on both sides of the adsorption layer 2218, the top of the lifting plate 2216 is in contact with the bottom surface of the sliding plate 2213, one end of the spring 2217 is connected with the bottom of the lifting plate 2216, the other end of the spring 2217 is connected with the top of the fixed plate 2212, so that the lifting plate 2216 can move along the inside of the connecting cylinder 2211 to the fixed plate 2212, the distance between the lifting plate 2216 and the fixed plate 2212 is equal to the original length of the spring 2217, the adsorption layer 2218 is sponge, the diameter of the second lower liquid holes 22121 is not less than that of the third lower liquid holes 22161, the diameter of the third lower liquid holes 22161 is not less than that of the first lower liquid holes 22131, when the pressure in the initial reaction kettle 100 is small, the adsorption layer 2218 is first adsorbed to control the reaction rate, when the pressure in the reaction kettle 100 is too high, the vacuum pump 223 is used to perform negative pressure pumping, the lifting plate 2216 feels a pulling force and moves downward to compress the spring 2217, so that the liquid in the adsorption layer 2218 is squeezed out of the third lower liquid holes 22161, the lifting plate 2216 is separated from the sliding plate 2213, and the inflow of bromoethane liquid is accelerated, so as to reduce the decrease of the dropping speed of bromoethane due to the increasing pressure in the reaction kettle 100.

[0031] Further, the conveying part 220 is a metering pump, an inlet of the metering pump is connected with the bottom outlet of the bromoethane storage 210, and an outlet of the metering pump is connected with an inlet of the feeding pipe 230. Since the bromoethane gasified in the negative pressure feeding process is extracted by the negative pressure and is wasted, and the reaction kettle 100 is in a negative pressure state, the pressure in the reaction kettle 100 changes, the reaction temperature control is poor, and therefore the metering pump is used for positive pressure feeding. On the one hand, the bromoethane in the bromoethane storage 210 can be stably added into the reaction kettle 100, and on the other hand, the pressure in the reaction kettle 100 is not affected, the temperature control in the reaction kettle 100 is good, and the reaction is beneficial. On the other hand, the added bromoethane cannot be extracted by the negative pressure and is wasted, and the loss of raw materials is reduced.

[0032] Further, the outlet of the metering pump is connected with the inlet of the bromoethane storage 210, a first valve 231 is arranged on a pipeline connecting the outlet of the metering pump with the inlet of the feeding pipe 230, and a second valve 211 is arranged on a pipeline connecting the outlet of the metering pump with the inlet of the bromoethane storage 210. When the reaction is completed, the first valve 231 is closed and the second valve 211 is opened, so that the pressure in the pipeline connecting the outlet of the metering pump with the inlet of the feeding pipe 230 is balanced by the bromoethane storage 210, and the safety hidden danger is reduced.

[0033] Further, the system further comprises a recovery unit 400, the recovery unit 400 comprises a condenser 410 and a receiving tank 420, a material inlet of the condenser 410 is connected with a top outlet of the reaction kettle 100, and a material outlet of the condenser 410 is connected with the receiving tank 420.

[0034] Specifically, the condenser 410 is two, and the two condensers 410 are connected in series.

[0035] Further, the material outlet of the condenser 410 is further connected with a reflux inlet of the reaction kettle 100.

[0036] Further, a third valve 411 is arranged on a pipeline connecting the material outlet of the condenser 410 with the reflux inlet of the reaction kettle 100, and a fourth valve 412 is arranged on a pipeline connecting the material outlet of the condenser 410 with the receiving tank 420. During the alkylation reaction, the third valve 411 is opened and the fourth valve 412 is closed, the bromoethane gasified enters the condenser 410, is condensed by the condenser 410, and is refluxed to the reaction kettle 100 to continue the reaction, so that the waste of bromoethane is reduced. When the alkylation reaction is completed, the fourth valve 412 is opened and the third valve 411 is closed, the remaining bromoethane is distilled, the bromoethane gas is condensed by the condenser 410 and is collected in the receiving tank 420, so that the bromoethane is recovered and reused.

[0037] Further, the separation unit 500 is further included, the separation unit 500 includes N-ethyl carbazole separation kettle 510, chlorobenzene high tank 520, the inlet of the N-ethyl carbazole separation kettle 510 is connected with the bottom outlet of the reaction kettle 100, the raw material inlet of the N-ethyl carbazole separation kettle 510 is connected with the outlet of the chlorobenzene high tank 520, after the completion of the alkylation reaction, the material in the reaction kettle 100 is transported into the N-ethyl carbazole separation kettle 510, and the N-ethyl carbazole is separated by dissolving in chlorobenzene to obtain N-ethyl carbazole.

[0038] Further, the N-ethyl carbazole separation kettle 510 is provided with a feeding pipe 511, one end of the feeding pipe 511 extends into the middle part of the N-ethyl carbazole separation kettle 510, and the product is as much as possible to reduce splashing and adhere to the inner wall of the N-ethyl carbazole separation kettle 510.

[0039] The use of the present application will now be described through the following examples. Example one:

[0040] Please refer to Figure 2 , the control member 221 is a regulating valve; during the alkylation reaction, the liquid caustic in the liquid caustic high tank 300 is added into the reaction kettle 100, then the carbazole and the catalyst are added into the reaction kettle 100 through the feeding port 110, and then the cooling coil 212 outside the bromoethane storage member 210 is used to cool the bromoethane to avoid bromoethane vaporization, the bromoethane storage member 210 is a high tank, and the flow of the bromoethane is controlled through the regulating valve; when the pressure in the reaction kettle 100 is too high, the vacuum pump 223 is used to perform negative pressure extraction to make the bromoethane liquid flow normally, the added bromoethane is stably and dropwise conveyed into the liquid phase bottom of the reaction kettle 100 through the feeding pipe 230 to perform the alkylation reaction, during the alkylation reaction, the third valve 411 is opened and the fourth valve 412 is closed, the vaporized bromoethane enters the condenser 410, and the bromoethane is condensed by the condenser 410 and flows back into the reaction kettle 100 to continue the reaction, thereby reducing the waste of bromoethane; after the completion of the alkylation reaction, the material in the reaction kettle 100 is transported into the N-ethyl carbazole separation kettle 510, and the N-ethyl carbazole is separated by dissolving in chlorobenzene to obtain N-ethyl carbazole. Example two:

[0041] Please refer to Figure 3 , 4In the alkylation reaction, the liquid alkali in the liquid alkali head tank 300 is added to the reaction kettle 100, then the carbazole and catalyst are added to the reaction kettle 100 through the feeding port 110, then the cooling coil 212 outside the bromoethane storage 210 is used to cool the bromoethane to avoid bromoethane vaporization, the bromoethane storage 210 is a head tank, when the pressure in the initial reaction kettle 100 is low, the bromoethane liquid flows into the reaction kettle 100 by first being adsorbed by the adsorption layer 2218 to control the reaction rate, when the pressure in the reaction kettle 100 is too high, the negative pressure is extracted by the vacuum pump 223, the suction force felt by the lifting plate 2216 moves downward to compress the spring 2217, so that the liquid in the adsorption layer 2218 is squeezed out from the third lower liquid hole 22161, and the lifting plate 2216 is separated from the sliding plate 2213 to accelerate the inflow of the bromoethane liquid, so as to reduce the decrease in the bromoethane drop rate due to the increasing pressure in the reaction kettle 100, the added bromoethane is stably added and delivered to the liquid phase bottom of the reaction kettle 100 through the feeding pipe 230 to perform the alkylation reaction, in the alkylation reaction, the third valve 411 is opened and the fourth valve 412 is closed, the vaporized bromoethane enters the condenser 410, is condensed by the condenser 410 and flows back to the reaction kettle 100 to continue the reaction, so as to reduce the waste of bromoethane; after the alkylation reaction is completed, the material in the reaction kettle 100 is delivered to the N-ethyl carbazole separation kettle 510, and the N-ethyl carbazole is separated by being dissolved in chlorobenzene to obtain N-ethyl carbazole. Example Three

[0042] Please refer to Figure 5 , the conveying part 220 is a metering pump, in the alkylation reaction, the liquid alkali in the liquid alkali head tank 300 is added to the reaction kettle 100, then the carbazole and catalyst are added to the reaction kettle 100 through the feeding port 110, then the cooling coil 212 outside the bromoethane storage 210 is used to cool the bromoethane to avoid bromoethane vaporization, the bromoethane is positively fed by the metering pump, on the one hand, the bromoethane in the bromoethane storage 210 can be stably added to the reaction kettle 100, on the other hand, the pressure in the reaction kettle 100 is not affected, the temperature control in the reaction kettle 100 is good, which is beneficial to the reaction; on the other hand, the added bromoethane cannot be extracted by negative pressure, which reduces the loss of raw materials, the added bromoethane is stably added and delivered to the liquid phase bottom of the reaction kettle 100 through the feeding pipe 230 to perform the alkylation reaction, in the alkylation reaction, the third valve 411 is opened and the fourth valve 412 is closed, the vaporized bromoethane enters the condenser 410, is condensed by the condenser 410 and flows back to the reaction kettle 100 to continue the reaction, so as to reduce the waste of bromoethane; after the alkylation reaction is completed, the material in the reaction kettle 100 is delivered to the N-ethyl carbazole separation kettle 510, and the N-ethyl carbazole is separated by being dissolved in chlorobenzene to obtain N-ethyl carbazole.

[0043] The above only discloses preferred embodiments of the present application, and of course cannot limit the scope of the present application, and those skilled in the art can understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present application still belong to the scope covered by the present application.

Claims

1. A stable, dropwise ethyl bromide addition, violacylating apparatus characterized by, The utility model provides a kind of reaction kettle, stable feeding assembly, liquid alkali high tank, the reaction kettle is additionally provided with feeding port, the stable feeding assembly includes bromoethane storage, conveying part, feeding pipe, the outside of the bromoethane storage is provided with cooling coil, the outlet of the liquid alkali high tank is connected with the inlet of the reaction kettle, the outlet of the bromoethane storage is connected with the inlet of the conveying part, the outlet of the conveying part is connected with the inlet of the feeding pipe, the feeding pipe is connected with the reaction kettle, the bottom of the feeding pipe is located in the lower part of the reaction kettle, so that the liquid in the bromoethane storage is stably conveyed into the reaction kettle.

2. The stable, bromoethane-dripped, purpuran-alkylating apparatus of claim 1, wherein, The conveying part includes control, vacuum tube, vacuum pump, the bromoethane storage is bromoethane high tank, the bottom outlet of the bromoethane high tank is connected with one end of the control, the other end of the control is connected with the inlet of the feeding pipe, one end of the vacuum tube is connected with the reaction kettle, the other end of the vacuum tube is connected with the vacuum pump.

3. The stable, bromoethane-dripped, purpuran-alkylating apparatus of claim 2, wherein, The control is regulating valve.

4. The permanent purple alkylation apparatus for the stable dropwise addition of bromoethane as described in claim 1, characterized in that, The conveying part is metering pump, the inlet of the metering pump is connected with the bottom outlet of the bromoethane storage, the outlet of the metering pump is connected with the inlet of the feeding pipe.

5. The stable, bromoethane-dripped, purpuran-alkylating apparatus of claim 4, wherein, The outlet of the metering pump is connected with the inlet of the bromoethane storage, first valve is arranged on the pipeline that the outlet of the metering pump is connected with the inlet of the feeding pipe, second valve is arranged on the pipeline that the outlet of the metering pump is connected with the inlet of the bromoethane storage.

6. The stable, bromoethane-dripped, purpuran-alkylating apparatus of claim 1, wherein, It also includes a recovery unit, the recovery unit includes condenser, receiving tank, the material inlet of the condenser is connected with the top outlet of the reaction kettle, the material outlet of the condenser is connected with the receiving tank.

7. The stable, bromoethane-dripped, purpuran-alkylating apparatus of claim 6, wherein, The material outlet of the condenser is also connected with the reflux inlet of the reaction kettle.

8. The stable, bromoethane-dripped, purpuran-alkylating apparatus of claim 7, wherein, Third valve is arranged on the pipeline that the material outlet of the condenser is connected with the reflux inlet of the reaction kettle, fourth valve is arranged on the pipeline that the material outlet of the condenser is connected with the receiving tank.

9. The stable bromoethane-dripped purpuran alkylation apparatus of claim 1 or 6, wherein, It also includes a separation unit, the separation unit includes N-ethyl carbazole separation kettle, chlorobenzene high tank, the inlet of the N-ethyl carbazole separation kettle is connected with the bottom outlet of the reaction kettle, the raw material inlet of the N-ethyl carbazole separation kettle is connected with the outlet of the chlorobenzene high tank.

10. The stable, bromoethane-dripped, purpuran-alkylating apparatus of claim 8, wherein, N-ethyl carbazole separation kettle is provided with feed pipe, one end of the feed pipe extends into the middle part of the N-ethyl carbazole separation kettle.

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