CN218924641U - Continuous device for preparing 2-methyl resorcinol - Google Patents

Abstract

The application provides a continuous device for preparing 2-methyl resorcinol, which comprises a diazotizing unit, a hydrolyzing unit, an alkali dissolving unit and an acidifying unit which are sequentially communicated; the hydrolysis unit comprises a first micromixer, a first tubular reactor, a first extraction device and a reflux device. The continuous device for preparing the 2-methyl resorcinol reduces the residence time in the reaction process, reduces the occurrence of side reactions, can reduce the safety risk, and improves the product quality, thereby improving the total yield of the product; the device provided by the application can realize automatic continuous production, and further improve the production efficiency; the extraction device of the hydrolysis unit can reflux the extraction liquid to the micromixer for recycling through the reflux control component, thereby reducing the generation of wastewater and lowering the cost.

Description

Continuous device for preparing 2-methyl resorcinol

Technical Field

The application belongs to the technical field of chemical industry, and particularly relates to a continuous device for preparing 2-methyl resorcinol.

Background

The 2-methylresorcinol, namely the 2-methylresorcinol, is white or white-like crystalline powder, is easy to dissolve in water and organic solvents, has weak acidity in water, and can generate chemical reaction to generate substances such as ether, ester, ketone and the like. Since 2-methylresorcinol has many important physicochemical properties, it has very wide application in chemical fields, and it can be applied to various fields of synthetic resin, dyeing, medicine, pesticide, pigment, dye, hair dye, agrochemical, photosensitive material and explosive, etc., is one of very important chemical intermediates, and has been used in a large amount in recent years in products such as shampoo, skin care products, etc. due to its good sterilizing function.

The current industrial process for synthesizing 2-methylresorcinol mainly uses o-methyl m-chloroaniline as a raw material, and 3-chloro-2-methylphenol is obtained after diazotization and hydrolysis in an autoclave, and then 2-methylresorcinol is obtained through high-pressure alkali dissolution. In the use process of the autoclave, if the operation is improper, safety accidents are easy to cause, and the residual liquid generated by diazotization and hydrolysis by adopting the autoclave cannot be reused, so that the waste liquid treatment cost is increased.

For example: in the patent document of application number CN202121171869.4, a catalytic synthesis kettle for 2-methyl resorcinol is described, and in the process of synthesizing 2-methyl resorcinol, the catalytic synthesis is performed by using a synthesis kettle to generate a high-pressure environment, and no description is made on how to treat waste materials generated in the production process of 2-methyl resorcinol. Also for example: in the patent document CN202010490428.4, a method for synthesizing 2, 6-dihydroxytoluene is described, in which the raw material is required to be synthesized in an autoclave during the synthesis of 2-methylresorcinol, and how the waste material generated during the production of 2-methylresorcinol is handled is not described.

Disclosure of Invention

In view of this, the present application provides a continuous apparatus for preparing 2-methylresorcinol, which aims to reduce the production cost of 2-methylresorcinol and improve the safety of the production process.

The application provides a continuous device for preparing 2-methyl resorcinol, which comprises a diazotizing unit, a hydrolyzing unit, an alkali dissolving unit and an acidifying unit which are sequentially communicated; the hydrolysis unit comprises:

a first micromixer comprising a first inlet and a second inlet, the first inlet being in communication with an outlet of the diazotisation unit;

the inlet of the first tubular reactor is communicated with the outlet of the first micromixer;

the first extraction device comprises a first outlet and a second outlet, wherein the first outlet is communicated with the alkali dissolution unit, and the second outlet is communicated with the first micromixer;

and the reflux device is communicated with the second outlet of the first extraction device and the second inlet of the first micromixer.

According to any embodiment of the first aspect of the present application, the hydrolysis unit further comprises a first microchannel heat exchanger, the inlet of the first microchannel heat exchanger being in communication with the first outlet, the outlet of the first microchannel heat exchanger being in communication with the base unit.

According to any embodiment of the first aspect of the present application, the diazotisation unit, the alkali dissolution unit and the acidification unit each comprise at least one reaction module comprising:

a micromixer for mixing reaction raw materials;

the inlet of the tubular reactor is communicated with the outlet of the micromixer, the tubular reactor in the diazotizing unit is used for completing diazotizing reaction, the tubular reactor in the alkali dissolving unit is used for completing alkali dissolving reaction, and the tubular reactor in the acidification unit is used for completing acidification reaction.

According to any embodiment of the first aspect of the present application, the diazotizing unit further comprises:

and the quenching module is communicated with the outlet of the tubular reactor of the diazotizing unit and the first inlet of the first micromixer.

According to any embodiment of the first aspect of the present application, the quenching module comprises:

a third micromixer, an inlet of which is in communication with an outlet of the tubular reactor of the diazotizing unit, and

and the inlet of the third tubular reactor is communicated with the outlet of the third micromixer, and the outlet of the third tubular reactor is communicated with the first inlet of the first micromixer.

According to any embodiment of the first aspect of the present application, the quenching module further comprises:

and the inlet of the filtering device is communicated with the outlet of the third tubular reactor, and the outlet of the filtering device is communicated with the first inlet of the first micromixer.

According to any of the embodiments of the first aspect of the present application, the filtration device comprises a plurality of filters arranged side by side, the plurality of filters being respectively connected in series with the outlet of the third tubular reactor.

According to any embodiment of the first aspect of the present application, the alkali dissolution unit comprises:

and the inlet of the dehalogenation module is communicated with the outlet of the tubular reactor of the alkali dissolution unit.

According to any embodiment of the first aspect of the present application, the dehalogenation module comprises:

a second extraction device, the inlet of which is communicated with the outlet of the tubular reactor of the alkali dissolution unit, and

the first fixed bed micro-reactor, the second extraction device comprises a third outlet and a fourth outlet, the inlet of the first fixed bed micro-reactor is communicated with the third outlet, and the fourth outlet is used for discharging waste liquid in the second extraction device.

According to any embodiment of the first aspect of the present application, the dehalogenation module further comprises:

and the inlet of the second micro-channel heat exchanger is communicated with the outlet of the first fixed bed micro-reactor.

According to any embodiment of the first aspect of the present application, the apparatus further comprises:

the inlet of the decoloring unit is communicated with the outlet of the tubular reactor of the acidification unit;

the inlet of the extraction unit is communicated with the outlet of the decoloring unit;

and the inlet of the distillation unit is communicated with the outlet of the extraction unit.

Compared with the prior art, the application has the following beneficial effects:

according to the continuous device for preparing 2-methyl resorcinol, chemical reaction is carried out by adopting the first micro mixer and the first tubular reactor, so that potential safety hazards in the preparation process can be effectively reduced. In addition, compared with the conventional three-stage process, the device provided by the application realizes at least four stages of processes by sequentially connecting the diazotizing unit, the hydrolyzing unit, the alkali dissolving unit and the acidifying unit, so that the residence time in the reaction process can be reduced, the occurrence of side reaction is reduced, the product quality is improved, the production efficiency and the total yield of 2-methylresorcinol are improved, the automatic continuous production can be realized, and the production efficiency is further improved; the first extraction device of the hydrolysis unit can reflux the extraction liquid to the third micromixer for recycling through the reflux control component, thereby reducing the generation of wastewater and lowering the cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and that other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic structural diagram of a continuous apparatus for producing 2-methylresorcinol according to an embodiment of the present application.

Wherein reference numerals are as follows:

100. a diazotizing unit; 110. a second micromixer; 120. a second tubular reactor; 130. a quenching module; 131. a third micromixer; 132. a third tubular reactor; 133. a filtering device; 133a, a filter;

200. a hydrolysis unit; 210. a first micromixer; 211. a first inlet; 212. a second inlet; 213. a third inlet; 220. a first tubular reactor; 230. a first extraction device; 231. a first outlet; 232. a second outlet; 233. a reflow device; 234. a flow control means; 240. a first microchannel heat exchanger;

300. an alkali dissolution unit; 310. a fourth micromixer; 320. a fourth tube reactor; 330. a dehalogenation hydrolysis module; 331. a second extraction device; 332. a first fixed bed microreactor; 333. a second microchannel heat exchanger; 331a, a third outlet; 331b, fourth outlet;

400. an acidification unit; 410. a fifth micromixer; 420. a fifth tubular reactor;

500. a decoloring unit; 510. a second fixed bed microreactor;

600. an extraction unit; 610. a sixth micromixer; 620. a sixth tubular reactor; 630. a third extraction device;

700. and a distillation unit.

Detailed Description

In order to make the objects, technical solutions and advantageous technical effects of the present application more clear, features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by showing an example of the present application. In the drawings and the following description, at least some well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present application; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In the description of the present application, unless otherwise indicated, "above" and "below" are inclusive; "plural" and "several" mean two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like indicate an orientation or positional relationship merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The directional terms appearing in the following description are all directions shown in the drawings and do not limit the specific structure of the embodiments of the present application. In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected. The specific meaning of the terms in the present application can be understood as appropriate by one of ordinary skill in the art.

The above summary of the present application is not intended to describe each disclosed embodiment or every implementation of the present application. The following description more particularly exemplifies illustrative embodiments. Guidance is provided throughout this application by a series of embodiments, which may be used in various combinations. In the various examples, the list is merely a representative group and should not be construed as exhaustive.

The present application provides a continuous apparatus for producing 2-methylresorcinol. FIG. 1 is a schematic diagram showing the structure of a continuous apparatus for producing 2-methylresorcinol as an example. Referring to fig. 1, a continuous apparatus for preparing 2-methylresorcinol according to an embodiment of the present application includes: diazotizing unit 100, hydrolyzing unit 200, alkali dissolving unit 300 and acidifying unit 400, which are sequentially communicated; wherein the hydrolysis unit 200 comprises a first micromixer 210, a first tubular reactor 220, a first extraction device 230, and a reflux device 233.

The first micro mixer 210 includes a first inlet 211 and a second inlet 212, the first inlet 211 is communicated with the outlet of the diazotizing unit 100, and the first micro mixer 210 is used for receiving the mixed solution containing diazonium salt obtained after diazotizing reaction and mixing with protonic acid and organic solvent; the inlet of the first tubular reactor 220 is communicated with the outlet of the first micromixer 210, and the first tubular reactor 220 is used for completing the hydrolysis reaction to obtain a mixed solution containing 3-chloro-2-methylphenol; the inlet of the first extraction device 230 is communicated with the outlet of the first tubular reactor 220, the first extraction device 230 comprises a first outlet 231 and a second outlet 232, the first outlet 231 is communicated with the alkali dissolution unit 300, the second outlet 232 is communicated with the first micromixer 210, and the first extraction device 230 is used for receiving the mixed solution after the hydrolysis reaction and making the mixed solution complete the organic phase extraction treatment so as to obtain 3-chloro-2-methylphenol; the reflux means 233 communicates the second outlet 232 of the first extraction means 230 with the second inlet 212 of the first micromixer 210. The reflux device 233 can recycle the extracted and layered extract to the first micromixer 210 for recycling, thereby reducing the cost.

In some embodiments, the first micromixer 210 further includes a third inlet 213, the third inlet 213 for adding a hydrolysis reaction raw material, which may be sulfuric acid solution and toluene, for example.

In some embodiments, the reflux device 233 includes a reflux pipe and a flow control unit 234 disposed on the reflux pipe, the reflux pipe communicates the second outlet 232 of the first extraction device 230 with the second inlet 212 of the first micromixer 210, and the switch of the flow control unit 234 is controlled to control the extraction liquid after the extraction treatment to be recovered to the first micromixer 210 for continuous recycling.

In some embodiments, the flow control member 234 is a valve.

In some embodiments, the hydrolysis unit 200 further comprises a first microchannel heat exchanger 240, wherein an inlet of the first microchannel heat exchanger 240 is in communication with the first outlet 231 of the first extraction device 210, an outlet of the first microchannel heat exchanger 240 is in communication with an inlet of the alkali dissolution unit 300, and the first microchannel heat exchanger 240 is configured to heat the extracted mixed liquor in preparation for a subsequent alkali dissolution reaction.

In some embodiments, the diazotisation unit 100, the alkali dissolution unit 300, and the acidification unit 400 each include at least one reaction module including:

a micromixer for mixing reaction raw materials;

the inlet of the tubular reactor is communicated with the outlet of the micromixer, the tubular reactor in the diazotizing unit 100 is used for completing the diazotizing reaction, the tubular reactor in the alkali dissolving unit 300 is used for completing the alkali dissolving reaction, and the tubular reactor in the acidifying unit 400 is used for completing the acidifying reaction.

Those skilled in the art will appreciate that the micromixer may include one or more inlets. In the case of a micromixer comprising a plurality of inlets, the plurality of inlets may be in communication with an upstream line for receiving the product or mixture prepared upstream, and the plurality of inlets may also be in communication with different raw material bins for adding the raw materials required for the reaction through the inlets.

For convenience of description, hereinafter, the micromixer for mixing the reaction raw materials in the diazotizing unit 100 is referred to as a second micromixer 110, the tubular reactor for completing the diazotizing reaction in the diazotizing unit 100 is referred to as a second tubular reactor 120, the micromixer in the alkali dissolving unit 300 is referred to as a fourth micromixer 310, the tubular reactor in the alkali dissolving unit 300 is referred to as a fourth tubular reactor 320, the micromixer in the acidifying unit 400 is referred to as a fifth micromixer 410, and the tubular reactor in the acidifying unit 400 is referred to as a fifth tubular reactor 420.

In one embodiment, the second micromixer 110 is used to mix the reaction materials of the diazotization reaction; the second tubular reactor 120 is used to complete the diazotisation of the reaction feed to obtain a diazonium salt intermediate that forms 3-chloro-2-methylphenol.

In some embodiments, the diazotizing unit 100 further comprises:

the quenching module 130, the quenching module 130 is connected to the outlet of the tubular reactor of the diazotizing unit 100 and the first inlet 211 of the first micromixer 210, and the quenching module 130 is configured to receive the mixed solution after the diazotizing reaction and mix the mixed solution with the quencher in the quenching module to complete the quenching reaction.

In some embodiments, the quenching module 130 includes:

a third micromixer 131, an inlet of the third micromixer 131 being in communication with an outlet of the tubular reactor of the diazotizing unit 100, the third micromixer 131 for receiving the mixed liquid after the diazotizing reaction and mixing the mixed liquid with the quencher in the third micromixer 131, and

the third tubular reactor 132, the inlet of the third tubular reactor 132 is communicated with the outlet of the third micromixer 131, the outlet of the third tubular reactor 132 is communicated with the first inlet 211 of the first micromixer 210, and the third tubular reactor 132 is used for enabling the mixed liquor and the quenching reagent to complete the quenching reaction.

In some embodiments, the quenching module 130 further comprises:

the inlet of the filtering device 133 is communicated with the outlet of the third tubular reactor 132, and the outlet of the filtering device 133 is communicated with the first inlet 211 of the first micromixer 210. The filtering device 133 is used for receiving the mixed solution after the quenching reaction and filtering the mixed solution to obtain diazonium salt.

In some embodiments, the filtering device 133 includes a plurality of filters 133a, the plurality of filters 133a being disposed in parallel, the plurality of filters 133a being respectively connected in series with the outlet of the third tubular reactor 132 to increase the efficiency of the filtering process.

In some embodiments, the alkali dissolution unit 300 includes:

the inlet of the dehalogenation module 330 is communicated with the outlet of the tubular reactor of the alkali dissolution unit 300. The dehalogenation module 330 is configured to receive the mixed solution after the alkali dissolution, and complete the dehalogenation reaction of the mixed solution to obtain phenolate.

In some embodiments, the dehalogenation module 330 comprises:

a second extraction device 331, an inlet of the second extraction device 331 being connected to an outlet of the fourth tubular reactor 320 to receive the alkali-dissolved mixed solution and to perform aqueous extraction of the mixed solution, and

the first fixed bed microreactor 332, the second extraction device 331 includes a third outlet 331a and a fourth outlet 331b, and an inlet of the first fixed bed microreactor 332 communicates with the third outlet 331 a. The first fixed bed microreactor 332 is configured to receive the extracted aqueous phase mixture and complete the dehalogenation reaction to obtain phenolate, and the extracted waste liquid is discharged from the fourth outlet 331 b.

In some embodiments, the dehalogenation module 330 further comprises:

the second microchannel heat exchanger 333, the inlet of the second microchannel heat exchanger 333 is in communication with the outlet of the first fixed bed microreactor 332. The second micro-channel heat exchanger 333 is used for cooling the mixed solution after the dehalogenation reaction.

In some embodiments, the acidification unit 400 includes a fifth micromixer 410 and a fifth tubular reactor 420, where the fifth micromixer 410 is configured to receive a mixed solution containing phenolate obtained after the alkali dissolution reaction and mix the mixed solution with an acidification reaction raw material, and the acidification reaction raw material may be hydrochloric acid solution or ethyl acetate; the fifth tubular reactor 420 is used to complete the acidification reaction to obtain a mixed solution containing 2-methylresorcinol.

In some embodiments, the apparatus further comprises a decolorizing unit 500, an extraction unit 600, and a distillation unit 700. The inlet of the decoloring unit 500 is communicated with the outlet of the fifth tubular reactor 420 of the acidification unit 400, the inlet of the extraction unit 600 is communicated with the outlet of the decoloring unit 500, and the inlet of the distillation unit 700 is communicated with the outlet of the extraction unit 600.

The decoloring unit 500 is used for receiving the mixed liquid after the acidification reaction and decoloring the mixed liquid to obtain a colorless mixed liquid containing 2-methylresorcinol.

The extraction unit 600 is used for receiving the colorless mixed solution and allowing the colorless mixed solution to complete the extraction of the organic phase to obtain an extract phase of 2-methylresorcinol.

Distillation unit 700 is used to receive the extracted phase and complete the distillation to obtain pure 2-methylresorcinol.

In some embodiments, the decolorizing unit 500 includes a second fixed-bed microreactor 510, and an inlet of the second fixed-bed microreactor 510 is communicated with an outlet of the acidification unit 400, for receiving the mixed liquid after the acidification reaction, and performing a decolorizing treatment on the mixed liquid to obtain a colorless mixed liquid containing 2-methylresorcinol.

In some embodiments, the extraction unit 600 includes a sixth micromixer 610, a sixth tubular reactor 620, and a third extraction device 630, an inlet of the sixth micromixer 610 being in communication with an outlet of the decolorization unit 500 to receive a colorless mixed solution; the inlet of the sixth tubular reactor 620 is communicated with the outlet of the sixth micromixer 610 for mixing the colorless mixed liquid entering the sixth micromixer 610 with the organic solvent, and the inlet of the third extraction device 630 is communicated with the outlet of the sixth tubular reactor 620 for completing the extraction of the organic phase from the mixed liquid dissolved in the organic solvent.

In the embodiment of the continuous device for preparing the 2-methyl resorcinol, the micro mixer and the tubular reactor are adopted to carry out diazotization reaction, high-pressure alkali dissolution and other reactions, so that potential safety hazards in the preparation process can be effectively reduced. In addition, compared with the conventional three-stage process, the device provided by the application can realize automatic continuous production in a micromixer, a tubular reactor and other devices, thereby being capable of reducing the residence time of the reaction process and reducing the occurrence of side reactions, and further improving the production efficiency and the total yield of the 2-methylresorcinol.

Examples

The following examples more particularly describe the disclosure of the present application, which are intended as illustrative only, since numerous modifications and variations within the scope of the disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages and ratios reported in the examples below are by weight, and all reagents used in the examples are commercially available or are obtained synthetically according to conventional methods and can be used directly without further treatment, as well as the instruments used in the examples.

Taking o-methyl m-chloroaniline, 40% sulfuric acid solution and 40% sodium nitrite solution as starting materials, adjusting the feeding ratio, respectively pumping into a second micromixer 110 through a constant flow pump, mixing, then, entering a second tubular reactor 120, performing diazotization reaction in the second tubular reactor 120, and communicating an outlet of the second tubular reactor 120 with a third micromixer 131; the obtained reaction liquid is mixed with 10% urea solution in a third micromixer 131, then enters a third tubular reactor 132 for quenching, the outlet of the third tubular reactor 132 is communicated with a filtering device 133, and the filtered liquid directly enters the next step;

the filtered liquid is fed into a first micromixer 210 and mixed with 40% sulfuric acid solution (dissolved with 5wt.% CuSO) ₄ ) After toluene is mixed, the mixture enters a first tubular reactor 220 for hydrolysis, hydrolysate enters a first extraction device 230 from the first tubular reactor 220, organic phase layers in the hydrolysate are collected, aqueous phase enters a first micromixer 210 from a second outlet 232 of the first extraction device 230 through a circulation control part 234 for recycling, and the aqueous phase after being recycled for a plurality of times enters a sewage treatment tank; the organic phase enters the first microchannel heat exchanger 240 and undergoes heating treatment to prepare for the next alkali dissolution reaction.

The organic phase obtained after the temperature rise enters an alkali dissolution unit 300, is mixed with 50 percent potassium hydroxide solution in a fourth micromixer 310, enters a fourth tubular reactor 320 to complete alkali dissolution, enters a second extraction device 331 to extract water phase therein, and is pumped into a filling load Cu ⁺ The dehalogenation reaction is carried out at high temperature in a first fixed bed microreactor 332 of Ti molecular sieve catalyst;

cooling the product after the dehalogenation reaction to 60-80 ℃ through a second microchannel heat exchanger 333, then entering a fifth micromixer 410, mixing with hydrochloric acid solution and ethyl acetate in the fifth micromixer 410, then entering a fifth tubular reactor 420, after the acidification reaction is completed in the fifth tubular reactor 420, entering a second fixed bed microreactor 510 containing active carbon, after decoloration is completed, entering a sixth micromixer 610 to be mixed with ethyl acetate, then entering a sixth tubular reactor 620 and a third extraction device 630 to complete extraction, and distilling the extracted organic phase in a distillation unit 700 to obtain a crude 2-methylresorcinol product, wherein the water phase enters a sewage treatment system; recrystallizing the crude 2-methylresorcinol product in deionized water to obtain 2-methylresorcinol with purity greater than 99%.

While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (11)

1. A continuous device for preparing 2-methyl resorcinol is characterized by comprising a diazotizing unit, a hydrolyzing unit, an alkali dissolving unit and an acidifying unit which are sequentially communicated; the hydrolysis unit includes:

a first micromixer comprising a first inlet and a second inlet, the first inlet in communication with an outlet of the diazotisation unit;

a first tubular reactor, an inlet of which is in communication with an outlet of the first micromixer;

the inlet of the first extraction device is communicated with the outlet of the first tubular reactor, the first extraction device comprises a first outlet and a second outlet, the first outlet is communicated with the alkali dissolution unit, and the second outlet is communicated with the first micromixer;

and the reflux device is communicated with the second outlet of the first extraction device and the second inlet of the first micromixer.

2. The apparatus of claim 1, wherein the hydrolysis unit further comprises a first microchannel heat exchanger, the inlet of the first microchannel heat exchanger being in communication with the first outlet, the first microchannel heat exchanger outlet being in communication with the base unit.

3. The apparatus of claim 1, wherein the diazotisation unit, the alkali dissolution unit, and the acidification unit each comprise at least one reaction module comprising:

a micromixer for mixing reaction raw materials;

the inlet of the tubular reactor is communicated with the outlet of the micromixer, the tubular reactor in the diazotizing unit is used for completing diazotizing reaction, the tubular reactor in the alkali dissolving unit is used for completing alkali dissolving reaction, and the tubular reactor in the acidification unit is used for completing acidification reaction.

4. The apparatus of claim 3, wherein the diazotisation unit further comprises:

and the quenching module is communicated with the outlet of the tubular reactor of the diazotizing unit and the first inlet of the first micromixer.

5. The apparatus of claim 4, wherein the quenching module comprises:

a third micromixer, an inlet of which is in communication with an outlet of the tubular reactor of the diazotisation unit, and

and the inlet of the third tubular reactor is communicated with the outlet of the third micro-mixer, and the outlet of the third tubular reactor is communicated with the first inlet of the first micro-mixer.

6. The apparatus of claim 5, wherein the quenching module further comprises:

and the inlet of the filtering device is communicated with the outlet of the third tubular reactor, and the outlet of the filtering device is communicated with the first inlet of the first micromixer.

7. The apparatus of claim 6, wherein the filtration apparatus comprises a plurality of filters, a plurality of the filters being disposed in parallel, a plurality of the filters being respectively in series with the outlet of the third tubular reactor.

8. The apparatus of claim 3, wherein the alkali dissolution unit comprises:

and the inlet of the dehalogenation module is communicated with the outlet of the tubular reactor of the alkali dissolution unit.

9. The apparatus of claim 8, wherein the dehalogenation module comprises:

a second extraction device, the inlet of which is communicated with the outlet of the tubular reactor of the alkali dissolution unit, and

the first fixed bed micro-reactor, the second extraction device comprises a third outlet and a fourth outlet, the inlet of the first fixed bed micro-reactor is communicated with the third outlet, and the fourth outlet is used for discharging waste liquid in the second extraction device.

10. The apparatus of claim 9, wherein the dehalogenation module further comprises:

and the inlet of the second micro-channel heat exchanger is communicated with the outlet of the first fixed bed micro-reactor.

11. A device according to claim 3, characterized in that the device further comprises:

the inlet of the decoloring unit is communicated with the outlet of the tubular reactor of the acidification unit;

the inlet of the extraction unit is communicated with the outlet of the decoloring unit;

and the inlet of the distillation unit is communicated with the outlet of the extraction unit.

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