A continuous production device for liquid trimethylamine hydrochloride

Abstract

The utility model relates to the technical field of organic synthesis, specifically relates to a liquid trimethylamine hydrochloride continuous production device, including first stage graphite condenser, first stage graphite condenser feed port is connected with the venturi jet a discharge port intercommunication, and the venturi jet a feed port intercommunication trimethylamine input pipe and hydrochloric acid input pipe, first stage graphite condenser discharge port is connected with the venturi jet b feed port intercommunication, and the venturi jet b feed port intercommunication trimethylamine supplementary input pipe, second stage graphite condenser feed port is connected with the venturi jet b discharge port intercommunication, second stage graphite condenser discharge port is connected with the venturi jet c feed port intercommunication, and the venturi jet c feed port intercommunication trimethylamine secondary supplementary input pipe, third stage graphite condenser feed port is connected with the venturi jet c discharge port intercommunication, and third stage graphite condenser discharge port is connected with trimethylamine hydrochloride storage tank feed port intercommunication. The utility model can realize the full mixing of reactant, efficient heat exchange and continuous production.

Description

Technical Field

[0001] This utility model relates to the field of organic synthesis technology, specifically to a continuous production apparatus for liquid trimethylamine hydrochloride. Background Technology

[0002] Trimethylamine hydrochloride is a white crystalline powder or liquid with good chemical stability and reactivity. The rationality of its production process directly affects product quality and production efficiency. Traditional trimethylamine hydrochloride production often employs a batch process. This process typically involves introducing trimethylamine gas and hydrochloric acid solution into a reactor for a neutralization reaction, generating a trimethylamine hydrochloride solution, which is then further processed to obtain the finished product.

[0003] However, existing batch production processes and related equipment have many technical problems: First, the contact between trimethylamine gas and hydrochloric acid solution in the reactor is relatively simple, mostly involving natural mixing or simple stirring, resulting in insufficient contact between the two reactants and incomplete reaction. This not only reduces the utilization rate of raw materials but also affects the product yield. Second, hydrochloric acid is highly corrosive, and traditional reactors are mostly made of metal, which is prone to corrosion after long-term use, leading to a shortened equipment lifespan and a significant increase in maintenance costs. At the same time, impurities generated by corrosion can also mix into the product, affecting its purity. Third, a large amount of heat is released during the neutralization reaction. Batch reactors have low heat exchange efficiency, making it difficult to quickly remove the heat from the reaction, resulting in large temperature fluctuations in the reaction system. Excessive local temperature can easily trigger side reactions, further reducing product purity. In addition, batch production methods suffer from long production cycles and low efficiency, making it impossible to achieve continuous production and meet the needs of large-scale production. Furthermore, the process parameters for each batch are difficult to be completely consistent, resulting in poor product quality stability.

[0004] To address the aforementioned technical issues, some companies have attempted to improve existing equipment, but problems such as poor reactant mixing, insufficient heat exchange efficiency, and inadequate equipment corrosion protection still exist, failing to fundamentally resolve the defects of traditional processes. Utility Model Content

[0005] In view of the technical problems of incomplete reaction, short reactor life and low product purity in existing liquid trimethylamine hydrochloride production equipment, this utility model provides a continuous production device for liquid trimethylamine hydrochloride, which can realize full mixing of reactants, efficient heat exchange and continuous production.

[0006] The technical solution of this utility model is as follows: A continuous production apparatus for liquid trimethylamine hydrochloride includes a first-stage graphite condenser, the inlet of which is connected to the outlet of a venturi jet a, and the inlet of the venturi jet a is connected to a trimethylamine input pipe and a hydrochloric acid input pipe respectively. The outlet of the first-stage graphite condenser is connected to the inlet of the Venturi ejector b, and the inlet of the Venturi ejector b is also connected to the trimethylamine supplement input pipe. The inlet of the second-stage graphite condenser is connected to the outlet of the Venturi ejector b, and the outlet of the second-stage graphite condenser is connected to the inlet of the Venturi ejector c. The inlet of the Venturi ejector c is also connected to the trimethylamine secondary replenishment input pipe. The inlet of the third-stage graphite condenser is connected to the outlet of the Venturi jet generator c, and the outlet of the third-stage graphite condenser is connected to the inlet of the trimethylamine hydrochloride storage tank.

[0007] Furthermore, the bottom of the first-stage graphite condenser, the second-stage graphite condenser, and the third-stage graphite condenser are all equipped with inlets, and the top of the first-stage graphite condenser, the second-stage graphite condenser, and the third-stage graphite condenser are all equipped with outlets.

[0008] Furthermore, the first-stage graphite condenser, the second-stage graphite condenser, and the third-stage graphite condenser are all equipped with heat exchange channels. The inlet of the heat exchange channel is located at the lower part of the side wall of the condenser, and the outlet of the heat exchange channel is located at the upper part of the side wall of the condenser. Cooling medium flows in the heat exchange channel, which is industrial cooling water or ethylene glycol aqueous solution.

[0009] Furthermore, it also includes a trimethylamine main pipe. The outlet of the trimethylamine main pipe is divided into three branches of the same diameter through a connector. One branch is connected to the trimethylamine input pipe, one branch is connected to the trimethylamine supplement input pipe, and one branch is connected to the trimethylamine secondary supplement input pipe.

[0010] Furthermore, the trimethylamine input pipe, hydrochloric acid input pipe, trimethylamine supplement input pipe, and trimethylamine secondary supplement input pipe are all equipped with flow regulating valves and flow meters.

[0011] Furthermore, the flow regulating valve is an electrically operated regulating valve, and the flow meter is an electromagnetic flow meter. The flow regulating valve is connected to the control system, and the flow meter is connected to the control system for signal transmission. By linking the flow regulating valve and flow meter with the control system, the feed flow rate can be adjusted in real time according to the reaction progress, ensuring precise and controllable reaction ratios.

[0012] Furthermore, pressure and temperature sensors are installed on the pipes between the first-stage graphite condenser and Venturi ejector a, the second-stage graphite condenser and Venturi ejector b, and the third-stage graphite condenser and Venturi ejector c. These sensors are connected to the control system signals. The pressure and temperature sensors can monitor the pressure and temperature parameters of the reaction system in real time. If any abnormality occurs, the control system can issue a timely warning, improving the safety and reliability of the equipment operation.

[0013] Furthermore, a motor is fixedly installed on the top of the trimethylamine hydrochloride storage tank, and the output shaft of the motor is connected to an agitator, which is located inside the trimethylamine hydrochloride storage tank.

[0014] Furthermore, the trimethylamine hydrochloride storage tank is externally wrapped with an insulation layer.

[0015] Furthermore, the trimethylamine hydrochloride storage tank is equipped with a discharge port at the bottom, and a shut-off valve is installed at the discharge port.

[0016] The beneficial effects of this utility model are as follows: This invention employs a three-stage Venturi jet injector connected in series with a three-stage graphite condenser to achieve a staged, uniform mixing reaction of trimethylamine and hydrochloric acid, ensuring complete reaction and improving raw material utilization, product yield, and product purity. The three-stage series structure also enables continuous production of trimethylamine hydrochloride.

[0017] This invention utilizes a graphite condenser. Graphite exhibits exceptional resistance to highly corrosive media such as hydrochloric acid, surpassing traditional metal materials and effectively extending equipment lifespan while reducing maintenance costs. Furthermore, graphite's low coefficient of thermal expansion allows it to withstand rapid heating and cooling. The exothermic nature of acid-base neutralization reactions necessitates the use of a graphite condenser to ensure stable reaction system temperatures, preventing localized overheating and side reactions, thus further guaranteeing product purity. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the connection relationship of the continuous production unit of liquid trimethylamine hydrochloride in Example 1.

[0020] In the diagram, 1-first-stage graphite condenser, 2-second-stage graphite condenser, 3-third-stage graphite condenser, 4-trimethylamine hydrochloride storage tank, 5-Venturi ejector a, 6-Venturi ejector b, 7-Venturi ejector c, 8-motor. Detailed Implementation

[0021] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0022] Example 1 like Figure 1 As shown, this embodiment provides a continuous production apparatus for liquid trimethylamine hydrochloride, including a first-stage graphite condenser 1, a second-stage graphite condenser 2, and a third-stage graphite condenser 3. Each of the three condensers has a feed inlet at its bottom and a discharge outlet at its top. Each of the three condensers has a heat exchange channel inside. The inlet (cooling medium inlet) of the heat exchange channel is located at the lower part of the side wall of the graphite condenser, and the outlet (cooling medium outlet) is located at the upper part of the side wall. The cooling medium flowing within the heat exchange channel is industrial cooling water. Through the circulation of the cooling water, the heat generated by the neutralization reaction is quickly removed.

[0023] The continuous production unit for liquid trimethylamine hydrochloride also includes a hydrochloric acid feed tank and a trimethylamine feed tank. The hydrochloric acid feed tank is connected to the inlet of the main hydrochloric acid pipeline, and the outlet of the main hydrochloric acid pipeline is connected to the inlet of the hydrochloric acid input pipeline. The trimethylamine feed tank is connected to the inlet of the main trimethylamine pipeline. The outlet of the main trimethylamine pipeline is divided into three branches of the same diameter via a connector. One branch is connected to the inlet of the trimethylamine input pipeline, one branch is connected to the inlet of the trimethylamine supplementary input pipeline, and one branch is connected to the inlet of the secondary trimethylamine supplementary input pipeline.

[0024] The inlet of the first-stage graphite condenser 1 is connected to the outlet of the Venturi ejector a5. A pressure sensor and a temperature sensor are installed on the connecting pipe, and these sensors are respectively connected to the PLC control system for real-time monitoring of the pressure and temperature of the material within the pipe. The inlet of the Venturi ejector a5 is connected to the outlets of both the trimethylamine and hydrochloric acid input pipes. Both the trimethylamine and hydrochloric acid input pipes are equipped with flow regulating valves and flow meters. The flow regulating valves are electrically operated, and the flow meters are electromagnetic. The flow regulating valves are connected to the PLC control system for control, and the flow meters are also connected to the PLC control system for signal monitoring and adjustment of the feed flow rate in real time.

[0025] The outlet of the first-stage graphite condenser 1 is connected to the inlet of the Venturi ejector b6. The inlet of the Venturi ejector b6 is also connected to the outlet of the trimethylamine supplementary input pipe. The trimethylamine supplementary input pipe is equipped with a flow regulating valve and a flow meter. The flow regulating valve is an electric regulating valve, and the flow meter is an electromagnetic flow meter. The flow regulating valve is connected to the PLC control system, and the flow meter is connected to the PLC control system for signal transmission, which can monitor and adjust the feed flow rate in real time.

[0026] The inlet of the second-stage graphite condenser 2 is connected to the outlet of the venturi jet b6, and a pressure sensor and a temperature sensor are installed on the connecting pipe. The pressure sensor and the temperature sensor are respectively connected to the PLC control system signal, which can monitor the pressure and temperature of the material in the pipe in real time.

[0027] The outlet of the second-stage graphite condenser 2 is connected to the inlet of the Venturi ejector c7. The inlet of the Venturi ejector c7 is also connected to the outlet of the trimethylamine secondary replenishment input pipe. The trimethylamine secondary replenishment input pipe is equipped with a flow regulating valve and a flow meter. The flow regulating valve is an electric regulating valve, and the flow meter is an electromagnetic flow meter. The flow regulating valve is connected to the PLC control system, and the flow meter is connected to the PLC control system for signaling, which can monitor and adjust the feed flow rate in real time.

[0028] The inlet of the third-stage graphite condenser 3 is connected to the outlet of the venturi jet c7, and a pressure sensor and a temperature sensor are installed on the connecting pipe. The pressure sensor and the temperature sensor are respectively connected to the PLC control system signal, which can monitor the pressure and temperature of the material in the pipe in real time.

[0029] The outlet of the third-stage graphite condenser 3 is connected to the inlet of the trimethylamine hydrochloride storage tank 4. A motor 8 is fixedly installed on the top of the trimethylamine hydrochloride storage tank 4. The output shaft of the motor 8 is connected to a stirring paddle inside the storage tank. The stirring paddle includes a main shaft and stirring blades evenly distributed on the main shaft. The exterior of the trimethylamine hydrochloride storage tank 4 is covered with an insulation layer. An outlet is located at the bottom of the storage tank, and a shut-off valve is installed at the outlet to control the output of the finished product.

[0030] The operation process of the continuous production apparatus for liquid trimethylamine hydrochloride in this embodiment is as follows: S1. First, open the outlet valve of the hydrochloric acid raw material tank. Hydrochloric acid flows into the hydrochloric acid input pipe through the main hydrochloric acid pipe. Simultaneously, open the outlet valve of the trimethylamine raw material tank. After flowing into the trimethylamine main pipe, the trimethylamine is divided into three branches of the same diameter through a connector. The trimethylamine in one of the branches enters the trimethylamine input pipe. The PLC control system controls the opening of the electric regulating valves on the hydrochloric acid input pipe and the trimethylamine input pipe according to preset parameters. The flow rate of the two raw materials is monitored in real time by an electromagnetic flowmeter to ensure that the hydrochloric acid is continuously delivered at the set flow rate and the trimethylamine is delivered to the Venturi ejector a5 in the corresponding proportion. After the hydrochloric acid and trimethylamine are fully mixed in the Venturi ejector a5, the resulting mixture flows out from its outlet and enters the inlet of the first-stage graphite condenser 1 through the connecting pipe. During this process, the pressure sensor and temperature sensor on the connecting pipe collect the pressure and temperature data of the material in real time and transmit the data to the PLC control system. If the parameters are abnormal, the system will adjust the opening of the electric regulating valve in time to ensure that the material enters the first-stage graphite condenser 1 stably. The mixture undergoes a neutralization reaction in the first-stage graphite condenser 1. The heat generated by the reaction is quickly removed by the industrial cooling water circulating in the heat exchange channel, maintaining the temperature of the reaction system and completing the first stage of the reaction.

[0031] S2. The mixture after the first stage reaction flows out of the outlet of the first-stage graphite condenser 1 and enters the inlet of the Venturi ejector b6. Simultaneously, the second branch (trimethylamine supplementary input pipe) branching off from the trimethylamine main pipe, under the control of the PLC control system, precisely controls the trimethylamine flow rate through its electric regulating valve and electromagnetic flow meter, ensuring that the trimethylamine is delivered to the inlet of the Venturi ejector b6 at the same flow rate as the first branch, where it is thoroughly mixed again with the mixture after the first stage reaction within the Venturi ejector b6. The mixed material flows out of the outlet of the Venturi ejector b6 and enters the inlet of the second-stage graphite condenser 2 through a connecting pipe. Pressure and temperature sensors on the connecting pipe monitor the material pressure and temperature in real time and feed the data back to the PLC control system. The system fine-tunes the electric regulating valve based on the feedback data to ensure a stable flow of material into the second-stage graphite condenser 2. The material continues to undergo neutralization reaction in the second-stage graphite condenser 2. The heat generated by the reaction is removed by industrial cooling water in the heat exchange channel to maintain stable reaction conditions and complete the second stage reaction.

[0032] S3. The mixture after the second-stage reaction flows out of the outlet of the second-stage graphite condenser 2 and enters the inlet of the Venturi ejector c7. At this time, the third branch (trimethylamine secondary supplementary input pipe) branching off from the trimethylamine main pipe is controlled by the PLC control system through its electric regulating valve and electromagnetic flow meter to deliver trimethylamine at the same flow rate as the first two branches to the inlet of the Venturi ejector c7, where it is fully mixed with the mixture after the second-stage reaction. The mixture flows out of the outlet of the Venturi ejector c7 and enters the inlet of the third-stage graphite condenser 3 through the connecting pipe. The pressure and temperature sensors on the connecting pipe collect material pressure and temperature data in real time and transmit them to the PLC control system. The system adjusts the relevant valves in real time according to the data to ensure that the material enters the third-stage graphite condenser 3 stably. The material undergoes the final neutralization reaction in the third-stage graphite condenser 3. The heat of the reaction is removed by industrial cooling water in the heat exchange channel to ensure the complete reaction and form liquid trimethylamine hydrochloride product.

[0033] S4. After the third-stage reaction is completed, the liquid trimethylamine hydrochloride product flows out from the outlet of the third-stage graphite condenser 3 and enters the inlet of the trimethylamine hydrochloride storage tank 4 through the connecting pipe. The motor 8 installed on top of the trimethylamine hydrochloride storage tank 4 is turned on. The output shaft of the motor 8 drives the agitator to rotate, stirring the product inside the trimethylamine hydrochloride storage tank 4 to prevent sedimentation and stratification. Simultaneously, the external insulation layer of the trimethylamine hydrochloride storage tank 4 effectively maintains a stable internal temperature, preventing environmental temperature changes from affecting the product quality. When the product level in the trimethylamine hydrochloride storage tank 4 reaches a certain level, the operator can open the shut-off valve at the bottom outlet to output the product as needed, completing one continuous production cycle.

[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A continuous production apparatus for liquid trimethylamine hydrochloride, comprising a first-stage graphite condenser, characterized in that, The feed inlet of the first-stage graphite condenser is connected to the outlet of the Venturi ejector a, and the feed inlet of the Venturi ejector a is connected to the trimethylamine input pipe and the hydrochloric acid input pipe respectively. The outlet of the first-stage graphite condenser is connected to the inlet of the Venturi ejector b, and the inlet of the Venturi ejector b is also connected to the trimethylamine supplement input pipe. The inlet of the second-stage graphite condenser is connected to the outlet of the Venturi ejector b, and the outlet of the second-stage graphite condenser is connected to the inlet of the Venturi ejector c. The inlet of the Venturi ejector c is also connected to the trimethylamine secondary replenishment input pipe. The inlet of the third-stage graphite condenser is connected to the outlet of the Venturi jet generator c, and the outlet of the third-stage graphite condenser is connected to the inlet of the trimethylamine hydrochloride storage tank.

2. The continuous production apparatus for liquid trimethylamine hydrochloride as described in claim 1, characterized in that, The bottom of the first-stage, second-stage, and third-stage graphite condensers are equipped with inlets, and the top of the first-stage, second-stage, and third-stage graphite condensers are equipped with outlets.

3. The continuous production apparatus for liquid trimethylamine hydrochloride as described in claim 1, characterized in that, The first-stage, second-stage, and third-stage graphite condensers are all equipped with heat exchange channels. The inlet of the heat exchange channel is located at the lower part of the side wall of the condenser, and the outlet of the heat exchange channel is located at the upper part of the side wall of the condenser. Cooling medium flows through the heat exchange channels.

4. The continuous production apparatus for liquid trimethylamine hydrochloride as described in claim 1, characterized in that, It also includes a trimethylamine main pipe, whose outlet is divided into three branches of the same diameter via a connector. One branch is connected to the trimethylamine input pipe, one branch is connected to the trimethylamine supplement input pipe, and one branch is connected to the trimethylamine secondary supplement input pipe.

5. The continuous production apparatus for liquid trimethylamine hydrochloride as described in claim 1, characterized in that, The trimethylamine inlet pipe, hydrochloric acid inlet pipe, trimethylamine supplementary inlet pipe, and trimethylamine secondary supplementary inlet pipe are all equipped with flow regulating valves and flow meters.

6. The continuous production apparatus for liquid trimethylamine hydrochloride as described in claim 5, characterized in that, The flow regulating valve is an electrically operated regulating valve, and the flow meter is an electromagnetic flow meter. The flow regulating valve is connected to the control system, and the flow meter is connected to the control system for signal transmission.

7. The continuous production apparatus for liquid trimethylamine hydrochloride as described in claim 6, characterized in that, Pressure sensors and temperature sensors are installed on the pipes between the first-stage graphite condenser and Venturi ejector a, the pipes between the second-stage graphite condenser and Venturi ejector b, and the pipes between the third-stage graphite condenser and Venturi ejector c. The pressure sensors and temperature sensors are respectively connected to the control system signals.

8. The continuous production apparatus for liquid trimethylamine hydrochloride as described in claim 1, characterized in that, A motor is fixedly installed on the top of the trimethylamine hydrochloride storage tank. The output shaft of the motor is connected to an agitator, which is located inside the trimethylamine hydrochloride storage tank.

9. The continuous production apparatus for liquid trimethylamine hydrochloride as described in claim 1, characterized in that, The trimethylamine hydrochloride storage tank is covered with an insulation layer.

10. A continuous production apparatus for liquid trimethylamine hydrochloride as described in claim 1, characterized in that, The trimethylamine hydrochloride storage tank has a discharge port at the bottom, and a shut-off valve is installed at the discharge port.

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