Continuous production device of benzimidazolone

Abstract

The utility model relates to a continuous production device of benzimidazolone, which comprises a urea storage tank, an aniline storage tank, a nitrogen buffer tank, a dynamic tubular reactor and a benzimidazolone storage tank, the aniline storage tank is connected with a liquid inlet in the bottom of the dynamic tubular reactor through a liquid inlet pipe, the nitrogen buffer tank is connected with a gas inlet in the upper portion of the dynamic tubular reactor through a gas inlet pipe, a discharging pipe of the dynamic tubular reactor is connected with the benzimidazolone storage tank, the dynamic tubular reactor is connected with the cooling and heating all-in-one machine, and the cooling and heating all-in-one machine is connected with the nitrogen buffer tank. The device is used for supplying heat to the dynamic tubular reactor. According to the utility model, continuous feeding and discharging are realized, continuous synthesis of benzimidazolone is realized, and the production process is continuous and controllable.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, and specifically relates to a continuous production device for benzimidazole. Background Technology

[0002] Benzimidazole ketones are important intermediates in the synthesis of various organic pigments. They are crucial intermediates in pharmaceuticals, pigments, and dyes. Benzimidazole ketone pigments are widely used azo-type organic pigments with excellent properties. Traditional methods for synthesizing benzimidazole ketones include the urea method, the phosgene method, and the dimethyl carbonate method.

[0003] Currently, manufacturers of benzimidazole generally use o-dichlorobenzene as a solvent system and aniline substances as raw materials in a relatively traditional urea process, employing a batch reactor synthesis mode for production.

[0004] Patent CN1675185 describes a method for synthesizing 5-amino-6-methylbenzimidazole, which involves refluxing 3,4-diaminotoluene with urea in a solvent and then performing a condensation reaction to obtain 5-methylbenzimidazole.

[0005] Patents CN 101863840A and CN 101863840B describe a method for synthesizing 5-amino-6-methylbenzimidazole, which describes the preparation of 5-methylbenzimidazole by condensing 3,4-diaminotoluene with urea using o-dichlorobenzene as a solvent.

[0006] In traditional processes, the synthesis of benzimidazole ketones requires a solvent system, making the feeding process complex and necessitating reactions in a reactor, which hinders continuous production. Large solvent consumption, the need for solvent removal of the crude product, and the resulting occupational health risks for operators, along with the generation of substantial amounts of wastewater requiring subsequent treatment, all contribute to the process. Summary of the Invention

[0007] The technical problem to be solved by this utility model is to provide a continuous production device for benzimidazole, which solves the problems of secondary desolvation, low production efficiency, complex process and high production cost in the existing benzimidazole production process.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A continuous production apparatus for benzimidazole includes a urea storage tank, an aniline storage tank, a nitrogen buffer tank, a dynamic tubular reactor, and a benzimidazole storage tank. The urea storage tank is connected to the feed inlet at the top of the dynamic tubular reactor. The aniline storage tank is connected to the liquid inlet at the bottom of the dynamic tubular reactor via a liquid inlet pipe. The nitrogen buffer tank is connected to the air inlet at the top of the dynamic tubular reactor via an air inlet pipe. The discharge pipe of the dynamic tubular reactor is connected to the benzimidazole storage tank. The dynamic tubular reactor is connected to a heating and cooling unit for heating the dynamic tubular reactor.

[0010] The urea storage tank is equipped with a weighing device at the bottom outlet.

[0011] The inlet pipe is equipped with a delivery pump, a mass flow meter, and a flow control valve.

[0012] The air intake pipe is equipped with a solenoid valve.

[0013] The dynamic tubular reactor is equipped with a thermometer and a pressure gauge.

[0014] The dynamic tubular reactor is equipped with a sampling port at the bottom.

[0015] The ratio of the height to the diameter of the reaction chamber tube in the dynamic tubular reactor is (10-20):1.

[0016] The discharge pipe of the dynamic tubular reactor is equipped with an electromagnetic induction device.

[0017] Compared with existing technologies, the beneficial effects of this utility model are:

[0018] 1. This utility model realizes continuous feeding and discharging, and achieves continuous synthesis of benzimidazolone, with continuous and controllable production process.

[0019] 2. A weighing device is installed at the discharge port of the urea storage tank, which improves the accuracy of feeding.

[0020] 3. The dynamic tubular reactor uses an integrated heating and cooling system for temperature control, which quickly reaches the reaction temperature and is easy to adjust.

[0021] 4. Aniline reacts directly with urea in a molten state, without the need for solvents during the preparation process, thus avoiding occupational health hazards and environmental pollution caused by the use of solvents.

[0022] 5. The dynamic tubular reactor is equipped with a sampling port, which allows for the sampling and testing of reaction products to obtain information on material mixing and reaction conditions, facilitating the adjustment of various parameters.

[0023] This invention enables a condensation reaction of aniline and urea as raw materials in a solvent-free system under nitrogen protection, with urea being added as a solid feedstock. The process is simple, easy to operate, and suitable for industrial production. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] In the diagram: 1. Urea storage tank; 2. Aniline storage tank; 3. Nitrogen buffer tank; 4. Dynamic tubular reactor; 5. Benzimidazole storage tank; 6. Integrated heating and cooling unit; 7. Liquid inlet pipe; 8. Air inlet pipe; 9. Weighing device; 10. Transfer pump; 11. Mass flow meter; 12. Flow control valve; 13. Solenoid valve one; 14. Thermometer; 15. Pressure gauge; 16. Sampling port; 17. Solenoid valve two. Detailed Implementation

[0026] In the description of this utility model, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figure 1 A continuous production apparatus for benzimidazole includes a urea storage tank 1, an aniline storage tank 2, a nitrogen buffer tank 3, a dynamic tubular reactor 4, and a benzimidazole storage tank 5. The urea storage tank 1 is connected to the feed inlet at the top of the dynamic tubular reactor 4. The aniline storage tank 2 is connected to the liquid inlet at the bottom of the dynamic tubular reactor 4 via a liquid inlet pipe 7. The nitrogen buffer tank 3 is connected to the air inlet at the top of the dynamic tubular reactor 4 via an air inlet pipe 8. The discharge pipe of the dynamic tubular reactor 4 is connected to the benzimidazole storage tank 5. The dynamic tubular reactor 4 is connected to a combined heating and cooling unit 6 for heating the dynamic tubular reactor 4.

[0029] The urea storage tank 1 is equipped with a weighing device 9 at the bottom outlet.

[0030] The inlet pipe 7 is equipped with a delivery pump 10, a mass flow meter 11, and a flow control valve 12.

[0031] The air intake pipe 8 is equipped with a solenoid valve 13.

[0032] The dynamic tubular reactor 4 is equipped with a thermometer 14 and a pressure gauge 15.

[0033] The dynamic tubular reactor 4 is provided with a sampling port 16 at the bottom.

[0034] The ratio of the height to the diameter of the reaction chamber tube in the dynamic tubular reactor 4 is (10-20):1.

[0035] The discharge pipe of the dynamic tubular reactor is equipped with an electromagnetic 17.

[0036] The working process of the above device:

[0037] Molten aniline in aniline storage tank 2 is fed into dynamic tubular reactor 4 via mass flow meter 11 at a flow rate of 100-220 g / min through transfer pump 10. Urea in urea storage tank 1 is weighed by weighing device 9 and then enters dynamic tubular reactor 4. Dynamic tubular reactor 4 is connected to integrated heating and cooling unit to achieve temperature control.

[0038] Aniline and urea are mixed in a mass ratio of 1:1 to 1:1.3, the reaction temperature is 120℃-170℃, the residence time is 20-100 min, and nitrogen is introduced into the dynamic tubular reactor as a protective gas. The temperature and pressure of the dynamic tubular reactor 4 are measured by thermometer 14 and pressure gauge 15, respectively. The discharge from the dynamic tubular reactor 4 enters the benzimidazole ketone storage tank.

[0039] To make the objectives, technical solutions, and technical effects of this utility model clearer, the technical solutions in the embodiments of this utility model are now described clearly and completely. However, the embodiments described below are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art in conjunction with the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0040] Example 1:

[0041] A continuous production apparatus for benzimidazole includes a urea storage tank 1, an aniline storage tank 2, a nitrogen buffer tank 3, a dynamic tubular reactor 4, and a benzimidazole storage tank 5. The urea storage tank 1 is connected to the feed inlet at the top of the dynamic tubular reactor 4, and a weighing device 9 is provided at the discharge outlet at the bottom of the urea storage tank 1.

[0042] The ratio of the height to the diameter of the reaction chamber tube in the dynamic tubular reactor 4 is 12:1. The dynamic tubular reactor 4 is connected to the integrated heating and cooling unit 6 for heating the dynamic tubular reactor 4. The dynamic tubular reactor 4 is equipped with a thermometer 14 and a pressure gauge 15. A sampling port 16 is located at the bottom of the dynamic tubular reactor 4.

[0043] The aniline storage tank 2 is connected to the inlet at the bottom of the dynamic tubular reactor 4 via the inlet pipe 7. The inlet pipe 7 is equipped with a transfer pump 10, a mass flow meter 11, and a flow control valve 12.

[0044] The nitrogen buffer tank 3 is connected to the air inlet at the top of the dynamic tubular reactor 4 via the air inlet pipe 8, and the air inlet pipe 8 is equipped with a solenoid valve 13.

[0045] The discharge pipe of the dynamic tubular reactor 4 is connected to the benzimidazole storage tank 5, and an electromagnetic 17 is installed on the discharge pipe of the dynamic tubular reactor.

[0046] Example 2:

[0047] A continuous production apparatus for benzimidazole includes a urea storage tank 1, an aniline storage tank 2, a nitrogen buffer tank 3, a dynamic tubular reactor 4, and a benzimidazole storage tank 5. The urea storage tank 1 is connected to the feed inlet at the top of the dynamic tubular reactor 4, and a weighing device 9 is provided at the discharge outlet at the bottom of the urea storage tank 1.

[0048] The ratio of the height to the diameter of the reaction chamber tube in the dynamic tubular reactor 4 is 18:1. The dynamic tubular reactor 4 is connected to the integrated heating and cooling unit 6 for heating the dynamic tubular reactor 4. The dynamic tubular reactor 4 is equipped with a thermometer 14 and a pressure gauge 15. A sampling port 16 is located at the bottom of the dynamic tubular reactor 4.

[0049] The aniline storage tank 2 is connected to the inlet at the bottom of the dynamic tubular reactor 4 via the inlet pipe 7. The inlet pipe 7 is equipped with a transfer pump 10, a mass flow meter 11, and a flow control valve 12.

[0050] The nitrogen buffer tank 3 is connected to the air inlet at the top of the dynamic tubular reactor 4 via the air inlet pipe 8, and the air inlet pipe 8 is equipped with a solenoid valve 13.

[0051] The discharge pipe of the dynamic tubular reactor 4 is connected to the benzimidazole storage tank 5, and an electromagnetic 17 is installed on the discharge pipe of the dynamic tubular reactor.

[0052] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and basic spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuous production apparatus for benzimidazolone, characterized in that, The system includes a urea storage tank, an aniline storage tank, a nitrogen buffer tank, a dynamic tubular reactor, and a benzimidazole storage tank. The urea storage tank is connected to the feed inlet at the top of the dynamic tubular reactor. The aniline storage tank is connected to the liquid inlet at the bottom of the dynamic tubular reactor via a liquid inlet pipe. The nitrogen buffer tank is connected to the air inlet at the top of the dynamic tubular reactor via an air inlet pipe. The discharge pipe of the dynamic tubular reactor is connected to the benzimidazole storage tank. The dynamic tubular reactor is connected to a combined heating and cooling unit for heating the dynamic tubular reactor.

2. The continuous production apparatus for benzimidazolone according to claim 1, characterized in that, The urea storage tank is equipped with a weighing device at the bottom outlet.

3. The continuous production apparatus for benzimidazolone according to claim 1, characterized in that, The inlet pipe is equipped with a delivery pump, a mass flow meter, and a flow control valve.

4. The continuous production apparatus for benzimidazolone according to claim 1, characterized in that, The air intake pipe is equipped with a solenoid valve.

5. A continuous production apparatus for benzimidazole according to claim 1, characterized in that, The dynamic tubular reactor is equipped with a thermometer and a pressure gauge.

6. A continuous production apparatus for benzimidazolone according to claim 1, characterized in that, The dynamic tubular reactor is equipped with a sampling port at the bottom.

7. A continuous production apparatus for benzimidazolone according to claim 1, characterized in that, The ratio of the height to the diameter of the reaction chamber tube in the dynamic tubular reactor is (10-20):

1.

8. A continuous production apparatus for benzimidazolone according to claim 1, characterized in that, The discharge pipe of the dynamic tubular reactor is equipped with an electromagnetic induction device.

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