A special device for preparing high-concentration ammonia water in industrial sulfanilamide production

Abstract

The utility model relates to ammonia water preparation technical field discloses a kind of special equipment for preparing high-concentration ammonia water in industrial sulfonamide production, including multiple liquid ammonia pipelines, the inside fixed connection of liquid ammonia pipeline has two throttling valves, the inside fixed connection of one liquid ammonia pipeline has absorption pump, the outside fixed connection of throttling valve has automatic controller, the outside fixed connection of another liquid ammonia pipeline has liquid ammonia evaporator, the outside fixed connection of one liquid ammonia pipeline has circulating tank, the inside fixed connection of one liquid ammonia pipeline other end in the liquid ammonia evaporator, the top fixed connection of circulating tank has jet absorber. In the utility model, by means of storage tank, liquid ammonia evaporative heat exchanger and other structures, automatic controller is matched to realize automation, combined with jet absorber vacuumizing to accelerate evaporation, the effect of automatic rapid preparation high-concentration ammonia water is realized, the safety of preparation process is guaranteed, and the demand of high-concentration ammonia water is satisfied.

Description

Technical Field

[0001] This utility model relates to the field of ammonia preparation technology, and in particular to a special equipment for preparing high-concentration ammonia in industrial sulfonamide production. Background Technology

[0002] Industrial sulfonamide production refers to the production process of preparing sulfonamide compounds through chemical synthesis on an industrial scale. Sulfonamide compounds are a class of chemical substances with the basic structure of p-aminobenzenesulfonamide. They were widely used as antibacterial drugs in the early days, and now they have been extended to many fields such as dyes, pesticides, and material intermediates. Their industrial production is an important branch of the fine chemical industry. High-concentration ammonia water refers to an aqueous solution of ammonia in which the mass fraction and volume fraction of ammonia are significantly higher than those of ordinary diluted ammonia water. It is widely used in industry, scientific research, and specific fields. Its core characteristics are the strong volatility, corrosiveness, and chemical activity brought about by the high ammonia content.

[0003] The industrial production of sulfonamides uses chlorosulfonic acid, acetanilide, thionyl chloride, ammonia, liquid alkali, and hydrochloric acid as main raw materials. The process involves four steps: sulfonation, amination, hydrolysis, and neutralization, ultimately synthesizing p-aminobenzenesulfonamide, or sulfonamide for short. High-concentration ammonia is required during the amination reaction in sulfonamide production; the ammonia concentration must reach at least 27.5%. Therefore, the safe and rapid preparation of high-concentration ammonia is essential to meet the process requirements of the amination reaction in sulfonamide production.

[0004] In existing technologies, some preparation devices rely on manual pre-calculation of the ratio of ammonia to diluent, followed by manual adjustment of the feed rate via valves. This method cannot detect the dynamic changes in ammonia concentration during the preparation process in real time. Furthermore, ammonia is highly volatile and its concentration is easily affected by fluctuations in ambient temperature and pressure, resulting in significant lag in manual adjustment. Therefore, to address these shortcomings, a device for rapidly preparing high-concentration ammonia is proposed to solve the aforementioned problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a special equipment for preparing high-concentration ammonia water in industrial sulfonamide production, aiming to improve the problems of low preparation efficiency and low automation in some existing preparation equipment.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A special equipment for preparing high-concentration ammonia water in industrial sulfonamide production, a liquid ammonia evaporator 4, includes multiple pipe connections. Two throttle valves are fixedly connected internally to the liquid ammonia pipe 1, and an automatic controller is fixedly connected externally to the throttle valves. The liquid ammonia inlet of the liquid ammonia evaporator 4 is fixedly connected externally. One ammonia gas phase outlet of the liquid ammonia evaporator 4 is connected to a gas-liquid separator 5 and then connected to the gas phase pipe of a jet absorber 8 via an ammonia gas phase pipe 9. One heat medium inlet (ammonia water) of the liquid ammonia evaporation heat exchanger 4 is connected to the outlet of an absorption pump 3. A circulation tank 6 is fixedly connected externally to the inlet of one of the absorption pump 3. One heat medium outlet (ammonia water) of the liquid ammonia evaporator 4 is connected to the liquid phase pipe of the jet absorber 8 via a pipe 10. The top of the jet absorber 8 and the circulation tank 6 are connected. As a further description of the above technical solution: A gas-liquid separator is fixedly connected to the top of the liquid ammonia evaporator, and a pipe a is fixedly connected to the outside of the gas-liquid separator. The other end of the pipe a is fixedly connected to the outside of the jet absorber. As a further description of the above technical solution: The upper part of the liquid ammonia evaporator is fixedly connected to a pipe b, and the other end of the pipe b is fixedly connected to the top of the jet absorber. As a further description of the above technical solution: A tower is fixedly connected to the top of the circulation tank, and a pipe c is fixedly connected to the lower outer end of the tower. As a further description of the above technical solution: A pump a is fixedly connected inside the liquid ammonia pipeline, one end of the liquid ammonia pipeline is fixedly connected inside the circulation tank, and the other end of the liquid ammonia pipeline is fixedly connected inside the tower.

[0007] This utility model has the following beneficial effects: 1. In this utility model, by using structures such as storage tanks and liquid ammonia evaporation heat exchangers, and with the help of an automated controller, automation is achieved. Liquid ammonia is introduced and evaporated through a liquid ammonia throttling valve, and the evaporation is accelerated by vacuuming with a jet absorber, so that the concentration of ammonia water can be rapidly increased to more than 27.5%. This achieves the effect of automated and rapid preparation of high-concentration ammonia water, ensuring the safety of the preparation process and meeting the demand for high-concentration ammonia water.

[0008] 2. In this utility model, a circulation system is constructed by means of a circulation tank and an ammonia water circulation absorption pump, which makes full use of the cooling capacity of liquid ammonia evaporation to lower the temperature of ammonia water. At the same time, the liquid ammonia evaporation and ammonia water absorption process are optimized, which greatly reduces the preparation time, significantly improves the preparation efficiency of high-concentration ammonia water, and enhances the overall production efficiency. Attached Figure Description

[0009] Figure 1This is a three-dimensional schematic diagram of a special equipment for preparing high-concentration ammonia water in the production of industrial sulfonamides, as proposed in this utility model.

[0010] Legend: 1. Liquid ammonia pipeline; 2. Throttling valve; 3. Absorption pump; 4. Liquid ammonia evaporator; 5. Gas-liquid separator; 6. Circulation tank; 7. Pump a; 8. Jet absorber; 9. Pipe a; 10. Pipe b; 11. Pipe c; 12. Tower; 13. Automation controller. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0012] A special equipment for preparing high-concentration ammonia water in industrial sulfonamide production, with reference to Figure 1 This includes: a special equipment 4 for preparing high-concentration ammonia water in industrial sulfonamide production, comprising a liquid ammonia pipeline 1, which is responsible for transporting core media such as liquid ammonia, ammonia water, and ammonia gas between various functional components; two throttle valves 2 are fixedly connected inside the liquid ammonia pipeline 1, mainly used to regulate the flow rate of liquid ammonia entering the liquid ammonia evaporator 4, and by precisely controlling the input amount of liquid ammonia; an absorption pump 3 is fixedly connected inside the liquid ammonia pipeline 1, driving the ammonia water to circulate between the circulation tank 6, the liquid ammonia evaporator 4, and the jet absorber 8; an automatic controller 13 is fixedly connected externally to the throttle valves 2, responsible for real-time monitoring of key process parameters such as the pressure, liquid level, and temperature of the liquid ammonia evaporator 4, and the ammonia water concentration and liquid level of the circulation tank 6, and by analyzing these parameters, the system automatically... The opening of the throttle valve 2 is adjusted. Another liquid ammonia pipeline 1 is fixedly connected to the outside of a liquid ammonia evaporator 4 to reduce the temperature of the ammonia water, creating favorable conditions for subsequent ammonia absorption and concentration increase. A circulation tank 6 is fixedly connected to the outside of a liquid ammonia pipeline 1 to store the ammonia water after the first-stage ammonia absorption in the hydrolysis reactor during sulfonamide production. It also serves as a buffer container for the circulation of ammonia water between the absorption pump 3, the liquid ammonia evaporator 4, the jet absorber 8, and the tower 12. The other end of a liquid ammonia pipeline 1 is fixedly connected to the inside of the liquid ammonia evaporator 4. A jet absorber 8 is fixedly connected to the top of the circulation tank 6. Its main function is to fully mix and react the ammonia gas generated by the liquid ammonia evaporator 4 with the low-temperature ammonia water, and to achieve a rapid increase in the concentration of ammonia water through the dissolution and absorption of ammonia gas. Specifically, a multi-liquid ammonia pipeline transports the core medium, with a throttle valve precisely regulating the liquid ammonia flow rate. An absorption pump drives the ammonia water circulation, ensuring stable medium transport and circulation. An automated controller monitors key parameters such as evaporator pressure, liquid level, temperature, and ammonia concentration in the circulation tank in real time, automatically adjusting the throttle valve opening for intelligent control. The liquid ammonia evaporator lowers the ammonia water temperature, creating conditions for ammonia absorption and concentration enhancement. The circulation tank stores ammonia water and acts as a buffer container. The jet absorber accelerates the evaporation rate of liquid ammonia by injecting ammonia water to create a vacuum, allowing ammonia gas to fully mix and react with the low-temperature ammonia water, rapidly increasing the ammonia water concentration. Overall, it efficiently adapts to the needs of high-concentration ammonia water preparation, contributing to the stable production of sulfonamides.

[0013] A gas-liquid separator 5 is fixedly connected to the top of the liquid ammonia evaporator 4. This separator primarily separates liquid ammonia droplets entrained in the ammonia gas produced by the liquid ammonia evaporator 4, preventing these droplets from entering the jet absorber 8 along with the ammonia gas. A pipe a9 is fixedly connected to the outside of the gas-liquid separator 5, specifically for transporting the purified ammonia gas from the gas-liquid separator 5 to the jet absorber 8, ensuring that the purified ammonia gas accurately enters the absorber. The other end of pipe a9 is fixedly connected to the outside of the jet absorber 8. A pipe b10 is fixedly connected to the upper part of the liquid ammonia evaporator 4, primarily for transporting the low-temperature ammonia water after heat exchange from the liquid ammonia evaporator 4 to the jet absorber 8, providing a low-temperature absorption medium to ensure efficient absorption of ammonia gas in a low-temperature environment. For dissolution and absorption, the other end of pipe b10 is fixedly connected to the top of the jet absorber 8. The top of the circulation tank 6 is fixedly connected to the tower 12, which is mainly used for further absorption of gaseous ammonia transported from the hydrolysis reactor in sulfonamide production through pipe c11. The lower end of the tower 12 is fixedly connected to pipe c11, which is used to transport gaseous ammonia generated in the hydrolysis reactor in sulfonamide production to the tower 12. There is also a liquid ammonia pipe 1 with a pump a7 fixedly connected inside, which is specifically responsible for transporting ammonia water in the circulation tank 6 to the tower 12 to provide material power for the absorption process of the tower 12. One end of another liquid ammonia pipe 1 is fixedly connected to the inside of the circulation tank 6, and the other end of another liquid ammonia pipe 1 is fixedly connected to the inside of the tower 12.

[0014] Specifically, the gas-liquid separator separates liquid ammonia droplets from the ammonia gas produced by the liquid ammonia evaporator, ensuring the purity of the ammonia gas entering the jet absorber. Pipeline A precisely delivers pure ammonia gas, while pipeline B sends the low-temperature ammonia water after heat exchange in the evaporator to the jet absorber, providing a low-temperature environment for efficient ammonia dissolution and absorption. Pump A provides power for the circulation tank to deliver ammonia water to the tower, and pipeline C sends gaseous ammonia from the hydrolysis reactor to the tower, where it can be further absorbed and treated. This not only improves the purity and efficiency of ammonia water preparation but also fully utilizes gaseous ammonia through secondary absorption, effectively meeting the needs of high-concentration ammonia water preparation and ammonia recovery in sulfonamide production.

[0015] The implementation principle of this application embodiment is as follows: First, liquid ammonia is transported from the storage tank through the liquid ammonia pipeline 1 and the liquid ammonia throttling valve 2 into the liquid ammonia evaporation heat exchanger 4. An external automation controller 13 is also installed to achieve automation. The liquid ammonia evaporator heat exchanger and ammonia liquid separator 5 are transported through the pipeline 9 into the jet absorber 8. The gas phase from the hydrolysis reactor in sulfonamide production is transported through the pipeline 11 and absorbed by the pump 7 and tower 12 into the circulation tank 6, which is combined with the special equipment. The ammonia water is continuously circulated by the ammonia water circulation absorption pump 3. The ammonia water at the inlet of the ammonia water circulation pump 3 comes from the gas phase ammonia in the hydrolysis reactor of sulfonamide production, and the ammonia water at the outlet of the ammonia water circulation absorption pump 3 enters the heat medium inlet of the liquid ammonia evaporator 4. After heat exchange in the liquid ammonia evaporator, the low-temperature ammonia water flows through the pipeline 1... Ammonia gas vaporized from liquid ammonia evaporator 4 enters pipeline 9 through gas-liquid separator 5 and then to jet absorber 8. In the jet absorber, low-temperature ammonia water and ammonia gas react. The ammonia gas comes from the gas phase ammonia outlet of the liquid ammonia evaporator and enters the vacuum tube generated by the ammonia water jet in the jet absorber 8. The evaporation of liquid ammonia in liquid ammonia evaporator 4 is further accelerated by evaporation. The temperature of ammonia water decreases rapidly through liquid ammonia evaporator 4, and the concentration of ammonia water increases rapidly through jet absorber 8. This achieves the purpose of safely and quickly preparing high-concentration ammonia water. This ammonia water preparation equipment not only further improves the preparation efficiency of high-concentration ammonia water, but also makes full use of the cooling capacity generated by liquid ammonia evaporation and cooling, so that the prepared ammonia water has a low temperature and an ammonia water concentration of over 27.5%.

[0016] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A special equipment for preparing high-concentration ammonia water in industrial sulfonamide production, comprising multiple liquid ammonia pipelines (1), characterized in that: Two throttle valves (2) are fixedly connected inside the liquid ammonia pipeline (1). An absorption pump (3) is fixedly connected inside one of the liquid ammonia pipelines (1). An automatic controller (13) is fixedly connected to the outside of the throttle valve (2). A liquid ammonia evaporator (4) is fixedly connected to the outside of the other liquid ammonia pipeline (1). A circulation tank (6) is fixedly connected to the outside of one of the liquid ammonia pipelines (1). The other end of one of the liquid ammonia pipelines (1) is fixedly connected inside the liquid ammonia evaporator (4). A jet absorber (8) is fixedly connected to the top of the circulation tank (6).

2. The special equipment for preparing high-concentration ammonia water in industrial sulfonamide production according to claim 1, characterized in that: A gas-liquid separator (5) is fixedly connected to the top of the liquid ammonia evaporator (4), and a pipe a (9) is fixedly connected to the outside of the gas-liquid separator (5). The other end of the pipe a (9) is fixedly connected to the outside of the jet absorber (8).

3. The special equipment for preparing high-concentration ammonia water in industrial sulfonamide production according to claim 1, characterized in that: The upper part of the liquid ammonia evaporator (4) is fixedly connected to a pipe b (10), and the other end of the pipe b (10) is fixedly connected to the top of the jet absorber (8).

4. The special equipment for preparing high-concentration ammonia water in industrial sulfonamide production according to claim 1, characterized in that: A tower (12) is fixedly connected to the top of the circulation tank (6), and a pipe c (11) is fixedly connected to the lower outer end of the tower (12).

5. A special equipment for preparing high-concentration ammonia water in industrial sulfonamide production according to claim 4, characterized in that: A pump a (7) is fixedly connected inside the liquid ammonia pipeline (1), one end of the liquid ammonia pipeline (1) is fixedly connected inside the circulation tank (6), and the other end of the liquid ammonia pipeline (1) is fixedly connected inside the tower (12).

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