N-propyl acetate under-liquid feeding forced circulation reaction system

Abstract

The invention discloses an n-propyl acetate under-liquid feeding forced circulation reaction system, and belongs to the technical field of organic synthesis, the n-propyl acetate under-liquid feeding forced circulation reaction system comprises a main body structure, a DCS operation module, an under-liquid reaction module, a forced circulation module, a deacidification module and a tracing protection module; the DCS operation module is responsible for centralized monitoring of the whole reaction system; the submerged reaction module is responsible for preheating acetic acid and normal propyl alcohol to 80-120 DEG C through a feeding preheater, so that the acetic acid and the normal propyl alcohol enter a reactor submerged distribution system; the forced circulation module is responsible for promoting the reaction uniformity of the raw materials; the deacidification module is responsible for removing acetic acid entrained in the reaction liquid; and the traceability protection module is responsible for recording and storing the information of the raw materials. According to the present invention, the DCS operation module is designed, such that the remote control of the reaction system is achieved, and the reaction efficiency is substantially improved and the energy consumption is reduced through the reaction modes of the submerged feeding, the forced circulation and the deacidification consumption reduction.

Description

Technical Field

[0001] The invention belongs to the technical field of organic synthesis, and in particular relates to a n-propyl acetate submerged feeding forced circulation reaction system. Background Art

[0002] The n-propyl acetate reaction system is a chemical system used to produce n-propyl acetate, which is usually composed of multiple equipment and components, including traditional reactors, jackets, heat exchangers, feed pumps and other equipment. In the reaction system, acetic acid and n-propyl alcohol undergo esterification reaction under the action of a catalyst to generate n-propyl acetate and water. As an excellent solvent, n-propyl acetate can be used to dissolve resins, pigments and other components in coatings and inks, so that the coatings and inks have good fluidity and coating properties. At the same time, in the production of adhesives, n-propyl acetate can also be used as a solvent or diluent to adjust the viscosity of the adhesive and improve its performance.

[0003] Traditional n-propyl acetate reactor equipment is relatively simple and low-cost, suitable for small-batch production and intermittent production, but relatively poor in safety, with risks such as waste liquid leakage and external pollution, posing a potential threat to the laboratory environment and personnel safety. Traditional equipment is not environmentally friendly in the treatment and discharge of waste liquid, which can easily cause environmental pollution and ecological damage. The conversion efficiency of the equipment is also very limited, and it is not suitable for large-scale production. Frequent manual and equipment operations are required, and the utilization efficiency of human resources is low, which cannot save raw materials, steam and other resources to the greatest extent.

[0004] In summary, the traditional n-propyl acetate reactor has many problems and shortcomings, mainly manifested in poor safety, great environmental impact, low storage efficiency, etc., and effective measures need to be taken to improve and perfect it. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the disadvantages of the prior art and provide a submerged feeding forced circulation reaction system for n-propyl acetate.

[0006] The technical solution adopted to solve the above technical problems is: a submerged feeding forced circulation reaction system of n-propyl acetate, comprising a main structure, a DCS operation module, a submerged reaction module, a forced circulation module, a deacidification module and a traceability protection module; the DCS operation module is responsible for centralized monitoring of the entire reaction system; the submerged reaction module is responsible for preheating acetic acid and n-propanol to 80-120° C. through a feed preheater, so that they enter the submerged distribution system of the reactor; the forced circulation module is responsible for promoting the uniformity of raw material reaction and enhancing heat and mass transfer; the deacidification module is responsible for removing acetic acid entrained in the reaction liquid; the traceability protection module is responsible for recording and storing the source of the raw materials, quality inspection reports, feeding time and quantity information, and tracking and recording the process parameters, equipment operation status, and product quality inspection result data during the reaction process.

[0007] Through the above technical solution, the raw materials enter the reactor's underwater distribution system and are evenly distributed and fully reacted, thereby improving the reaction efficiency. The traceability protection module has a traceability function that can record and store information such as temperature, pressure, and liquid level. Users can query historical records through the user interface to achieve traceability and management. The system is designed with multiple safety protection mechanisms, including liquid level alarms, temperature alarms, and flow alarms, to ensure safety and stability during the reaction process.

[0008] Furthermore, the main structure includes a reactor, and a submerged uniformly distributed feed port is installed at the lower part of the reactor. The outlet of the submerged uniformly distributed feed port is connected to the reaction liquid inside the reactor, the discharge port of the reactor is connected to the inlet of a forced circulation pump through a pipeline, the outlet of the forced circulation pump is connected to the inlet pipeline of a zirconium heat exchanger, the outlet of the zirconium heat exchanger is connected to the inlet of the reactor through a pipeline, and the product outlet of the reactor is connected to the feed port of a deacidification tower through a pipeline.

[0009] Furthermore, the DCS operation module is installed with temperature control, pressure control, liquid level control and flow control sensors, which are used to monitor the temperature, pressure, flow and liquid level parameter information of the waste liquid in real time. The DCS operation module is responsible for collecting sensor data and transmitting it to the data processing unit.

[0010] Furthermore, the forced circulation module circulates the reaction liquid after the reaction to the zirconium heat exchanger at the top of the reactor through the forced circulation pump of the reactor tower, and the zirconium heat exchanger provides the heat required for the reaction, while the n-propyl acetate and water generated by the reaction are evaporated in the form of azeotropy.

[0011] Furthermore, the deacidification module evaporates the incoming reaction liquid through a deacidification tower, and the deacidification tower removes the acetic acid entrained in the reaction liquid.

[0012] The beneficial effects of the present invention are as follows: (1) The present invention can achieve remote control of the reaction system, rapid response, reduce safety and environmental problems, improve reaction conversion rate, and perform underwater forced circulation reaction to improve efficiency by designing a DCS operation module; (2) The present invention greatly increases reaction efficiency, reduces energy consumption, and reduces resource waste by adopting underwater feeding, forced circulation, and deacidification and consumption reduction reaction methods; (3) The present invention designs multiple safety protection mechanisms to ensure that there is no leakage during the reaction process and protect the safety of equipment and operators. The system has data storage and query functions, and can record information such as the source, storage time, and treatment method of the waste liquid to achieve traceability management and facilitate monitoring and management. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a process flow chart of the present invention;

[0014] Figure 2 It is a system module diagram of the present invention.

[0015] Figure numerals: 1. Reactor; 2. Zirconium heat exchanger; 3. Submerged uniformly distributed feed inlet; 4. Forced circulation pump; 5. Deacidification tower. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] like Figure 1-Figure 2 As shown, a submerged feeding forced circulation reaction system of n-propyl acetate in this embodiment includes a main structure, a DCS operation module, a submerged reaction module, a forced circulation module, a deacidification module and a traceability protection module; the DCS operation module is responsible for centralized monitoring of the entire reaction system; the submerged reaction module is responsible for preheating acetic acid and n-propanol to 80-120° C. through a feed preheater, so that they enter the submerged distribution system of the reactor; the forced circulation module is responsible for promoting the uniformity of the raw material reaction and enhancing heat and mass transfer; the deacidification module is responsible for removing the acetic acid entrained in the reaction liquid; the traceability protection module is responsible for recording and storing the source of the raw materials, quality inspection reports, feeding time and quantity information, as well as tracking and recording the process parameters, equipment operation status, and product quality test result data during the reaction process, entering the submerged distribution system of the reactor 1, evenly distributed, fully reacted, and improved the reaction efficiency, and the traceability protection module has a traceability function, which can record and store information such as temperature, pressure, and liquid level. Users can query historical records through the user interface to achieve traceability and management. The system is designed with multiple safety protection mechanisms, including liquid level alarms, temperature alarms, and flow alarms, etc., to ensure safety and stability during the reaction process.

[0018] The main structure includes a reactor 1, wherein a submerged uniformly distributed feed port 3 is installed at the lower part of the reactor 1, the outlet of the submerged uniformly distributed feed port 3 is communicated with the reaction liquid inside the reactor 1, the discharge port of the reactor 1 is connected to the inlet of a forced circulation pump 4 through a pipeline, the outlet of the forced circulation pump 4 is connected to the inlet pipeline of a zirconium heat exchanger 2, the outlet of the zirconium heat exchanger 2 is connected to the inlet of the reactor 1 through a pipeline, and the product outlet of the reactor 1 is connected to the feed port of a deacidification tower 5 through a pipeline.

[0019] The DCS operation module is equipped with temperature control, pressure control, liquid level control and flow control sensors. The sensors are used to monitor the temperature, pressure, flow and liquid level parameter information of the waste liquid in real time. The DCS operation module is responsible for collecting sensor data and transmitting it to the data processing unit.

[0020] The forced circulation module circulates the reaction liquid after the reaction to the zirconium heat exchanger 2 at the top of the reactor 1 through the forced circulation pump 4 in the reactor 1, and the zirconium heat exchanger 2 provides the heat required for the reaction, while the n-propyl acetate and water generated by the reaction are evaporated in the form of azeotropy.

[0021] The deacidification module evaporates the incoming reaction liquid through the deacidification tower 5, and the deacidification tower 5 removes the acetic acid entrained in the reaction liquid.

[0022] The working principle of this embodiment is as follows: before the reaction starts, the reactor 1 is preheated to a certain temperature, which is usually achieved by introducing a heat medium through a zirconium heat exchanger 2, and then the catalyst is added to the reactor 1. Then, the acetic acid and n-propanol raw materials mixed in a certain proportion are slowly injected into the bottom of the reactor 1 through a submerged uniformly distributed feed port 3, so that the raw materials are fed below the liquid level in the reactor 1. This can avoid excessive contact between the raw materials and the air during the feeding process, reduce the occurrence of side reactions such as oxidation, and is also conducive to the uniform dispersion of the raw materials in the reaction liquid.

[0023] With the continuous addition of raw materials, under the action of the catalyst, acetic acid and n-propanol undergo esterification reaction in the reactor 1 to generate n-propyl acetate and water. The reaction temperature is generally controlled between 80°C and 120°C. The temperature of the reaction liquid is continuously adjusted by the zirconium heat exchanger 2 to keep it within a suitable range. At the same time, the forced circulation pump 4 starts to work, extracts the reaction liquid in the reactor 1 and returns it to the reactor 1, forming a forced circulation, so that the reaction liquid is fully mixed in the reactor 1, improving the uniformity and conversion rate of the reaction, and avoiding local overheating or overcooling that leads to incomplete reaction or increased side reactions.

[0024] When the reaction reaches a certain time or conversion rate, the reaction ends. At this time, the feed of raw materials and the operation of the forced circulation pump 4 are stopped, and the reaction liquid is allowed to stand in the reactor 1 for a period of time to allow the n-propyl acetate generated by the reaction, the unreacted raw materials and the by-products to be initially stratified and mixed. The reaction product is transported to the deacidification tower 5, and the acidic impurities in the n-propyl acetate are removed in the deacidification tower 5.

[0025] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A submerged feeding forced circulation reaction system for n-propyl acetate, comprising a main structure, a DCS operation module, a submerged reaction module, a forced circulation module, a deacidification module and a traceability protection module; The DCS operation module is responsible for the centralized monitoring of the entire reaction system; The submerged reaction module is responsible for preheating acetic acid and n-propanol to 80-120° C. through a feed preheater so that they enter the submerged distribution system of the reactor; The forced circulation module is responsible for promoting the uniformity of raw material reaction and enhancing heat and mass transfer; The deacidification module is responsible for removing the acetic acid entrained in the reaction solution; The traceability protection module is responsible for recording and storing the source of raw materials, quality inspection reports, feeding time and quantity information, as well as tracking and recording process parameters, equipment operating status, and product quality inspection result data during the reaction process.

2. The n-propyl acetate submerged feeding forced circulation reaction system according to claim 1, characterized in that: The main structure comprises a reactor (1), wherein a submerged uniformly distributed feed port (3) is installed at the lower part of the reactor (1), wherein the outlet of the submerged uniformly distributed feed port (3) is communicated with the reaction liquid in the reactor (1), wherein the discharge port of the reactor (1) is connected with the inlet of a forced circulation pump (4) via a pipeline, wherein the outlet of the forced circulation pump (4) is connected with the inlet pipeline of a zirconium heat exchanger (2), wherein the outlet of the zirconium heat exchanger (2) is connected with the inlet of the reactor (1) via a pipeline, and wherein the product outlet of the reactor (1) is connected with the feed port of a deacidification tower (5) via a pipeline.

3. The n-propyl acetate submerged feeding forced circulation reaction system according to claim 1, characterized in that: The DCS operation module is equipped with temperature control, pressure control, liquid level control and flow control sensors, which are used to monitor the temperature, pressure, flow and liquid level parameter information of the waste liquid in real time. The DCS operation module is responsible for collecting sensor data and transmitting it to the data processing unit.

4. The n-propyl acetate submerged feeding forced circulation reaction system according to claim 1, characterized in that: The forced circulation module circulates the reaction liquid after the reaction to the zirconium heat exchanger (2) at the top of the reactor (1) through the forced circulation pump (4) at the bottom of the reactor (1), and the zirconium heat exchanger (2) provides the heat required for the reaction, while the n-propyl acetate and water generated by the reaction are evaporated in the form of azeotropy.

5. The n-propyl acetate submerged feeding forced circulation reaction system according to claim 1, characterized in that: The deacidification module evaporates the incoming reaction liquid through the deacidification tower (5), and the deacidification tower (5) removes the acetic acid entrained in the reaction liquid.

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