Benzimidazolone continuous nitration production device

Abstract

The utility model belongs to the technical field of chemical equipment, and particularly relates to a benzimidazolone continuous nitration production device, which is characterized in that a benzimidazolone solid feeder and an acid liquor storage tank are both connected with a mixing tank, and a bottom discharge port of the mixing tank is connected with a bottom feed port of a primary tubular reactor; a top discharge port of the first-stage tubular reactor is connected with a bottom feed port of the second-stage tubular reactor, a top discharge port of the second-stage tubular reactor is connected with a bottom feed port of the third-stage tubular reactor, and a top discharge port of the third-stage tubular reactor is connected with the coarse material storage tank; the first-stage tubular reactor, the second-stage tubular reactor and the third-stage tubular reactor are all supplied with heat by a cold and hot all-in-one machine, the first-stage tubular reactor is connected with a first-stage reactor self-circulation pipeline, the second-stage tubular reactor is connected with a second-stage reactor circulation pipeline, and the third-stage tubular reactor is connected with a third-stage reactor circulation pipeline. The reaction kettle is used for continuously mixing materials, so that the material mixing effect is enhanced, and the reaction time is shortened.

Description

Technical Field

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

[0002] Benzimidazole is the main raw material for benzimidazole azo pigments. Benzimidazole azo pigments are a class of high-performance organic pigments, but their production is difficult, resulting in a high price. They possess bright and durable colors, making them suitable for most applications. In recent years, with the continuous development of continuous flow technology in chemical production, traditional batch reactor processes have been increasingly replaced. However, the production process of benzimidazole nitration is mostly carried out using batch reactor processes. These processes often involve strong exothermic reactions and explosion risks, and the reaction time is excessively long, resulting in numerous byproducts. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a continuous nitration production device for benzimidazole, which continuously mixes materials, enhances the mixing effect of materials, and shortens the reaction time.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A continuous nitration production apparatus for benzimidazole includes a benzimidazole solid feeder, an acid storage tank, a mixing tank, a primary tubular reactor, a secondary tubular reactor, a tertiary tubular reactor, a coarse material storage tank, and a heating and cooling unit. The benzimidazole solid feeder and the acid storage tank are both connected to the mixing tank. The bottom outlet of the mixing tank is connected to the bottom inlet of the primary tubular reactor. The top outlet of the primary tubular reactor is connected to the bottom inlet of the secondary tubular reactor. The top outlet of the secondary tubular reactor is connected to the bottom inlet of the tertiary tubular reactor. The top outlet of the tertiary tubular reactor is connected to the coarse material storage tank. The primary, secondary, and tertiary tubular reactors are all heated by the heating and cooling unit. The primary tubular reactor is connected to a primary reactor self-circulation pipeline, the secondary tubular reactor is connected to a secondary reactor circulation pipeline, and the tertiary tubular reactor is connected to a tertiary reactor circulation pipeline.

[0006] The benzimidazole solid feeder and acid storage tank are both connected to the top of the mixing tank.

[0007] The mixing tank is equipped with a stirrer.

[0008] The primary reactor is equipped with a primary circulation pump on its circulation pipeline, the secondary reactor is equipped with a secondary circulation pump on its circulation pipeline, and the tertiary reactor is equipped with a tertiary circulation pump on its circulation pipeline.

[0009] The primary, secondary, and tertiary tubular reactors are all equipped with jackets on the outside of their tube bodies. The jackets are respectively equipped with heating medium inlets and heating medium outlets. The outlet of the integrated heating and cooling unit is connected to the heating medium inlet of the primary tubular reactor, the heating medium outlet of the primary tubular reactor is connected to the heating medium inlet of the secondary tubular reactor, the heating medium outlet of the secondary tubular reactor is connected to the heating medium inlet of the tertiary tubular reactor, and the heating medium outlet of the tertiary tubular reactor is connected to the return outlet of the integrated heating and cooling unit.

[0010] Compared with existing technologies, the beneficial effects of this utility model are:

[0011] This invention enables continuous mixing. The multi-stage tubular reactor significantly shortens the reaction time. The tubular reactor features a self-circulation system to enhance material mixing. The reaction temperature is easily controlled, heat transfer efficiency is high, and side reactions are effectively avoided, improving the overall process quality and stability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] In the diagram: 1. Benzimidazole solid feeder; 2. Acid storage tank; 3. Mixing tank; 4. Primary tubular reactor; 5. Secondary tubular reactor; 6. Tertiary tubular reactor; 7. Coarse material storage tank; 8. Integrated heating and cooling unit; 9. Primary reactor self-circulation pipeline; 10. Secondary reactor circulation pipeline; 11. Tertiary reactor circulation pipeline; 12. Primary circulation pump; 13. Secondary circulation pump; 14. Tertiary circulation pump; 15. Jacket; 16. Agitator. Detailed Implementation

[0014] 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.

[0015] 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.

[0016] like Figure 1A continuous nitration production apparatus for benzimidazole includes a benzimidazole solid feeder 1, an acid storage tank 2, a mixing tank 3, a primary tubular reactor 4, a secondary tubular reactor 5, a tertiary tubular reactor 6, a coarse material storage tank 7, and a combined cooling and heating unit 8. The benzimidazole solid feeder 1 and the acid storage tank 2 are both connected to the mixing tank 3. The bottom outlet of the mixing tank 3 is connected to the bottom inlet of the primary tubular reactor 4, and the top outlet of the primary tubular reactor 4 is connected to the bottom inlet of the secondary tubular reactor 5. The top outlet of the secondary tubular reactor 5 is connected to the bottom inlet of the tertiary tubular reactor 6. The top outlet of the tertiary tubular reactor 6 is connected to the coarse material storage tank 7. The primary tubular reactor 4, the secondary tubular reactor 5, and the tertiary tubular reactor 6 are all heated by the integrated heating and cooling unit 8. The primary tubular reactor 4 is connected to the primary reactor self-circulation pipeline 9, the secondary tubular reactor 5 is connected to the secondary reactor circulation pipeline 10, and the tertiary tubular reactor 6 is connected to the tertiary reactor circulation pipeline 11.

[0017] The benzimidazole solid feeder 1 and the acid storage tank 2 are both connected to the top of the mixing tank 3.

[0018] The mixing tank 3 is equipped with a stirrer 16.

[0019] The primary reactor is equipped with a primary circulation pump 12 on the circulation pipeline 9, the secondary reactor is equipped with a secondary circulation pump 13 on the circulation pipeline 10, and the tertiary reactor is equipped with a tertiary circulation pump 14 on the circulation pipeline 11.

[0020] The primary tubular reactor 4, the secondary tubular reactor 5, and the tertiary tubular reactor 6 are all equipped with jackets 15 on the outside of their tube bodies. Each jacket 15 has a heating medium inlet and a heating medium outlet. The outlet of the integrated heating and cooling unit 8 is connected to the heating medium inlet of the primary tubular reactor 4, the heating medium outlet of the primary tubular reactor 4 is connected to the heating medium inlet of the secondary tubular reactor 5, the heating medium outlet of the secondary tubular reactor 5 is connected to the heating medium inlet of the tertiary tubular reactor 6, and the heating medium outlet of the tertiary tubular reactor 6 is connected to the return outlet of the integrated heating and cooling unit 8.

[0021] Work process:

[0022] Benzimidazole is fed into mixing tank 3 via benzimidazole solid feeder 1, and acid is fed into mixing tank 3 via acid storage tank 2. After mixing, the mixture enters primary tubular reactor 4. Primary circulation pump 12 is turned on, and the material overflows into secondary tubular reactor 5. Secondary circulation pump 13 is turned on, and the material overflows into tertiary tubular reactor 6. Tertiary circulation pump 14 is turned on, and the material overflows into coarse material storage tank 7.

[0023] 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.

[0024] Example:

[0025] A continuous nitration production apparatus for benzimidazole includes a benzimidazole solid feeder 1, an acid storage tank 2, a mixing tank 3, a primary tubular reactor 4, a secondary tubular reactor 5, a tertiary tubular reactor 6, a coarse material storage tank 7, and a combined cooling and heating unit 8. The benzimidazole solid feeder 1 and the acid storage tank 2 are both connected to the top of the mixing tank 3. The bottom outlet of the mixing tank 3 is connected to the bottom inlet of the primary tubular reactor 4, and the top outlet of the primary tubular reactor 4 is connected to the bottom inlet of the secondary tubular reactor 5. The top outlet of the secondary tubular reactor 5 is connected to the bottom inlet of the tertiary tubular reactor 6. The top outlet of the tertiary tubular reactor 6 is connected to the coarse material storage tank 7. The primary tubular reactor 4, the secondary tubular reactor 5, and the tertiary tubular reactor 6 are all heated by the integrated heating and cooling unit 8. The primary tubular reactor 4 is connected to the primary reactor self-circulation pipeline 9, the secondary tubular reactor 5 is connected to the secondary reactor circulation pipeline 10, and the tertiary tubular reactor 6 is connected to the tertiary reactor circulation pipeline 11.

[0026] The benzimidazole solid feeder 1 and the acid storage tank 2 are both connected to the top of the mixing tank 3.

[0027] The mixing tank 3 is equipped with a stirrer 16.

[0028] The primary reactor is equipped with a primary circulation pump 12 on the circulation pipeline 9, the secondary reactor is equipped with a secondary circulation pump 13 on the circulation pipeline 10, and the tertiary reactor is equipped with a tertiary circulation pump 14 on the circulation pipeline 11.

[0029] The primary tubular reactor 4, the secondary tubular reactor 5, and the tertiary tubular reactor 6 are all equipped with jackets 15 on the outside of their tube bodies. Each jacket 15 has a heating medium inlet and a heating medium outlet. The outlet of the integrated heating and cooling unit 8 is connected to the heating medium inlet of the primary tubular reactor 4, the heating medium outlet of the primary tubular reactor 4 is connected to the heating medium inlet of the secondary tubular reactor 5, the heating medium outlet of the secondary tubular reactor 5 is connected to the heating medium inlet of the tertiary tubular reactor 6, and the heating medium outlet of the tertiary tubular reactor 6 is connected to the return outlet of the integrated heating and cooling unit 8.

[0030] Benzimidazole is fed into mixing tank 3 via benzimidazole solid feeder 1. The acid solution, a 40% nitric acid solution, is fed into mixing tank 3 via acid storage tank 2. The mixed material then enters primary tubular reactor 4, where the reaction temperature is set to 80℃. Primary circulation pump 12 is activated, with a circulation rate of 20 times per minute. The material then enters secondary tubular reactor 5 via primary reactor 4, where secondary circulation pump 13 is activated, with a circulation rate of 20 times per minute. The material then enters tertiary tubular reactor 3 via secondary reactor 5, where tertiary circulation pump 14 is activated, with a circulation rate of 20 times per minute. Overflow material enters coarse material storage tank 7. After testing, the benzimidazole conversion rate is 99.31%, the dinitrate production is 0.05%, and the target product yield is 99.26%.

[0031] 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 nitration production apparatus for benzimidazolone, characterized in that, The system includes a benzimidazole solid feeder, an acid storage tank, a mixing tank, a primary tubular reactor, a secondary tubular reactor, a tertiary tubular reactor, a coarse material storage tank, and a heating and cooling unit. The benzimidazole solid feeder and acid storage tank are all connected to the mixing tank. The bottom outlet of the mixing tank is connected to the bottom inlet of the primary tubular reactor. The top outlet of the primary tubular reactor is connected to the bottom inlet of the secondary tubular reactor. The top outlet of the secondary tubular reactor is connected to the bottom inlet of the tertiary tubular reactor. The top outlet of the tertiary tubular reactor is connected to the coarse material storage tank. The primary, secondary, and tertiary tubular reactors are all heated by the heating and cooling unit. The primary tubular reactor is connected to the primary reactor's self-circulation pipeline, the secondary tubular reactor is connected to the secondary reactor's circulation pipeline, and the tertiary tubular reactor is connected to the tertiary reactor's circulation pipeline.

2. The benzimidazolone continuous nitration production apparatus according to claim 1, characterized in that, The benzimidazole solid feeder and acid storage tank are both connected to the top of the mixing tank.

3. A continuous nitration production apparatus for benzimidazolone according to claim 1, characterized in that, The mixing tank is equipped with a stirrer.

4. A continuous nitration production apparatus for benzimidazolone according to claim 1, characterized in that, The primary reactor is equipped with a primary circulation pump on its circulation pipeline, the secondary reactor is equipped with a secondary circulation pump on its circulation pipeline, and the tertiary reactor is equipped with a tertiary circulation pump on its circulation pipeline.

5. A continuous nitration production apparatus for benzimidazole ketone according to claim 1, characterized in that, The primary, secondary, and tertiary tubular reactors are all equipped with jackets on the outside of their tube bodies. The jackets are respectively equipped with heating medium inlets and heating medium outlets. The outlet of the integrated heating and cooling unit is connected to the heating medium inlet of the primary tubular reactor, the heating medium outlet of the primary tubular reactor is connected to the heating medium inlet of the secondary tubular reactor, the heating medium outlet of the secondary tubular reactor is connected to the heating medium inlet of the tertiary tubular reactor, and the heating medium outlet of the tertiary tubular reactor is connected to the return outlet of the integrated heating and cooling unit.

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