Synthesis production system of monoethanolamine benzoate

Abstract

The utility model belongs to the technical field of chemical production, and particularly relates to a monoethanolamine benzoate synthesis production system which comprises a first raw material tank, a second raw material tank, a reaction kettle, an intermediate tank and a centrifugal machine, the first raw material tank and the second raw material tank are respectively communicated with the reaction kettle through pipelines, and an output port of the reaction kettle is connected with an inlet of the intermediate tank through a pipeline. The system is characterized in that the system is arranged on a multi-layer frame, the first raw material tank and the second raw material tank are arranged on the top layer, the reaction kettle is located on the next layer, the intermediate tank is located on the second lower layer, the centrifugal machine is located on the third lower layer, the pipelines between all the layers of equipment are gravity self-flowing pipelines, and self-control valves are arranged on the pipelines; and flow meters are respectively arranged on the connecting pipes between the raw material tank I and the reaction kettle and between the raw material tank II and the reaction kettle. The gravity gradient self-flowing system has the advantages that by the adoption of the gravity gradient self-flowing system, the use amount of centrifugal pumps in the system is reduced, energy consumption is greatly reduced, and noise is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production, and particularly relates to a synthesis production system of benzoic acid monoethanolamine. Background Art

[0002] Benzoic acid monoethanolamine is a chemical substance with the molecular formula C9H13NO3 and the molecular weight of 183.2044. Benzoic acid monoethanolamine is a white powder with a melting point of 140 - 143 °C, odorless or with a slight ammonia smell. The uses of benzoic acid monoethanolamine: antioxidant, anti-metal oxidation (rust prevention of ship plates, rust prevention of construction steel bars), also used in surfactants, rust inhibitors, for metal cutting, cooling, etc. Quality indicators: purity ≥ 99.0%, loss on drying ≤ 1.5%.

[0003] The production method of benzoic acid monoethanolamine is usually obtained by reacting benzoic acid and monoethanolamine under appropriate conditions. The reaction is usually carried out in an inert atmosphere, controlling the temperature and time to improve the yield and purity. The synthesis method is to quantitatively extract benzoic acid and monoethanolamine from their respective storage tanks, pump them into the reaction kettle. After the reaction, the reaction mixture is transported to the intermediate tank through a closed pipeline, and then pumped from the intermediate tank into a centrifuge for centrifugal filtration. The obtained solid is the finished product of benzoic acid monoethanolamine, and the obtained liquid is returned to the waste liquid kettle.

[0004] The disadvantages of this production method are that the pipeline is long, the amount of pumps used is large, the power consumption is high, and the amount of remaining materials in the pipeline is large, which is not conducive to production management. There is also the problem of on-site pollution caused by accidental leakage of the pipeline. Content of the Utility Model

[0005] The purpose of the utility model is to provide a synthesis production system of benzoic acid monoethanolamine, which overcomes the deficiencies of the prior art, adopts a gravity gradient self-flow system, reduces the amount of centrifugal pumps used in the system, the raw materials flow into the reaction kettle by gravity, with less energy consumption and low noise, and realizes efficient and continuous production.

[0006] To achieve the above purpose, the utility model is realized through the following technical solutions:

[0007] A synthesis and production system for monoethanolamine benzoate, comprising a first raw material tank, a second raw material tank, a reaction kettle, an intermediate tank and a centrifuge. The first raw material tank and the second raw material tank are respectively connected to the reaction kettle through pipelines. The outlet of the reaction kettle is connected to the inlet of the intermediate tank through a pipeline. The outlet of the intermediate tank is connected to the inlet of the centrifuge through a pipeline. It is characterized in that the system is arranged on a multi-layer frame. The first raw material tank and the second raw material tank are arranged on the top layer. The reaction kettle is located on the next layer. The intermediate tank is located on the second layer below. The centrifuge is located on the third layer below. The pipelines between the equipment on each layer are gravity self-flow pipelines, and automatic control valves are arranged on the pipelines; Flow meters are respectively arranged on the connecting pipes between the first raw material tank and the second raw material tank and the reaction kettle. The connecting pipes are N-shaped bent pipes, and the flow meters are arranged on the pipe sections with the fluid direction upward; The liquid outlet of the centrifuge is connected to the mother liquor tank through a pipeline. The bottom of the mother liquor tank is connected to the feed inlet of the first raw material tank through a return pipe, and a centrifugal pump is arranged on the return pipe.

[0008] The centrifuge is a vertical centrifugal discharge filter screen diversion type centrifuge.

[0009] The automatic control valve is an electric valve or a pneumatic valve.

[0010] A fault drain port is arranged at the bottom of the intermediate tank, and the fault drain port is connected to the mother liquor tank.

[0011] The reaction kettle is a double-layer glass reaction kettle with an internal stirrer.

[0012] An inert gas inlet pipe is arranged on the reaction kettle and is connected to a nitrogen gas cylinder.

[0013] Multiple synthesis and production systems are controlled by one control system to achieve continuous automated production.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] 1) By adopting a gravity gradient self-flow system, the number of centrifugal pumps used in the system is reduced from 3 to 0. The raw materials flow into the reaction kettle by gravity, and the products after reaction flow into the intermediate tank by gravity, greatly reducing energy consumption and having low noise.

[0016] 2) Multiple synthesis and production systems can be controlled by one control system, with a high degree of automation, reducing labor intensity and achieving efficient continuous production. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model.

[0018] In the figure: 1 - first raw material tank, 2 - second raw material tank, 3 - reaction kettle, 4 - intermediate tank, 5 - centrifuge, 6 - frame, 7 - automatic control valve, 8 - connecting pipe, 9 - flow meter, 10 - fault drain port, 11 - mother liquor tank, 12 - nitrogen gas cylinder, 13 - control system, 14 - return pipe, 15 - centrifugal pump. Detailed implementation manners

[0019] The technical solutions of the present utility model will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model.

[0020] In order to more clearly illustrate the specific implementation manners of the present utility model or the technical solutions in the prior art, the specific embodiments required for the description of the specific implementation manners or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation manners of the present utility model. For those of ordinary skill in the art, without creative efforts, other specific embodiments can also be obtained based on these specific embodiments.

[0021] Generally, the components of the embodiments of the present utility model described and shown in the specific embodiments here can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the specific embodiments is not intended to limit the scope of the claimed present utility model, but only represents the selected embodiments of the present utility model.

[0022] See Figure 1 , which is a schematic structural diagram of an embodiment of a synthesis production system of benzoic acid monoethanolamine of the present utility model, including a first raw material tank 1 (the content is benzoic acid solution or saturated benzoic acid monoethanolamine solution), a second raw material tank 2 (the content is monoethanolamine solution), a reaction kettle 3, an intermediate tank 4 and a centrifuge 5. The first raw material tank 1 and the second raw material tank 2 are respectively connected to the reaction kettle 3 through pipelines. The output port of the reaction kettle 3 is connected to the inlet of the intermediate tank 4 through a pipeline. The outlet of the intermediate tank 4 is connected to the inlet of the centrifuge 5 through a pipeline. The system is arranged on a multi-layer frame 6. The first raw material tank 1 and the second raw material tank 2 are arranged on the top layer, the reaction kettle 3 is located on the next layer, the intermediate tank 4 is located on the second layer below, and the centrifuge 5 is located on the third layer below. The pipelines between the equipment on each layer are gravity self-flow pipelines, and automatic control valves 7 are arranged on the pipelines; flow meters 9 are respectively arranged on the connecting pipes 8 between the first raw material tank 1 and the second raw material tank 2 and the reaction kettle 3. The connecting pipe 8 is an N-shaped elbow, and the flow meter 9 is arranged on the pipe section with the fluid direction upward. The liquid outlet of the centrifuge 5 is connected to the mother liquor tank 11 through a pipeline. The bottom of the mother liquor tank 11 is connected to the feed inlet of the first raw material tank 4 through a return pipe 14, and a centrifugal pump 15 is arranged on the return pipe 14. The remaining material in the mother liquor tank 11 is saturated benzoic acid monoethanolamine solution, which can be pumped back to the first raw material tank 1 through the return pipe 14 by the centrifugal pump 15 for use as the raw material for the next synthesis production.

[0023] In the embodiment, the reaction kettle 3 is a double-layer glass reaction kettle with an internal stirrer. The raw materials are placed in the inner layer for stirring reaction, and different cold and heat sources (refrigerant, hot water or hot oil) can be passed through the interlayer for circulating heating or cooling reaction. The requirements for the reaction process parameters are met: under the conditions of 75 - 80 °C, the reaction time is 0.5 - 1.5 h. An inert gas inlet pipe is provided on the reaction kettle 3 and is connected to the nitrogen cylinder 12, and the nitrogen cylinder 12 can provide an inert gas atmosphere for the reaction kettle.

[0024] The function of the intermediate tank 4 is to cool and precipitate or buffer the materials. A failure drain port 10 is provided at its bottom, and the failure drain port 10 is connected to the mother liquor tank 11. When the production system is abnormal, the materials can be discharged and temporarily stored to facilitate equipment maintenance. The centrifuge 5 is a vertical centrifugal discharge filter screen diversion type centrifuge. By using centrifugal force, the continuous centrifuge simultaneously completes centrifugal filtration and centrifugal discharge. The angle of the diversion channel can be adjusted arbitrarily, so that the length of the channel can be changed, and the residence time of the materials in the diversion channel can be controlled, and the wet content of the solid materials can be controlled to the best state. Satisfactory results can be obtained for materials with solid particles larger than 40 μm. After the product of benzoic acid monoethanolamine is discharged from the outlet of the centrifuge 5, it can be stacked below the centrifuge 5 or transferred by a conveyor.

[0025] The automatic control valve 7 is an electric valve or a pneumatic valve, and its opening and closing can be remotely controlled through a control system.

[0026] A control system 13 can control multiple synthetic production systems of the present invention to achieve continuous automated production. During production, the control system opens the discharge valves of the raw material tank 1 and the raw material tank 2. The two metered raw materials enter the reaction kettle. The reaction kettle starts stirring and heating, and is kept warm within the reaction temperature range. After reacting for 0.5 - 1.5 h, the reaction mixture is discharged into the intermediate tank through the bottom outlet of the reaction kettle. The intermediate tank serves as cooling and buffering to ensure the normal feeding speed of the centrifuge until the separation is complete, and then the next production cycle begins. The feeding and discharging in the whole production process rely on gravity flow, without using a centrifugal pump, and the energy consumption is 30% of the original.

[0027] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A synthetic production system for monoethanolamine benzoate, comprising a raw material tank 1, a raw material tank 2, a reactor, an intermediate tank and a centrifuge, wherein the raw material tank 1 and the raw material tank 2 are connected to the reactor through pipelines, the output port of the reactor is connected to the inlet of the intermediate tank through a pipeline, and the outlet of the intermediate tank is connected to the inlet of the centrifuge through a pipeline, characterized in that: The system is arranged on a multi-layer frame, raw material tank 1 and raw material tank 2 are arranged on the top layer, the reactor is located on the next layer, the intermediate tank is located on the next two layers, and the centrifuge is located on the next three layers. The pipelines between the equipment on each layer are gravity self-flow pipelines, and automatic control valves are arranged on the pipelines; flow meters are respectively arranged on the connecting pipes between the raw material tank 1 and raw material tank 2 and the reactor, and the connecting pipes are N-shaped elbows, and the flow meters are arranged on the pipe sections with the fluid direction upward; the liquid outlet of the centrifuge is connected to the mother liquid tank through a pipeline, and the bottom of the mother liquid tank is connected to the feed port of the raw material tank 1 through a return pipe, and a centrifugal pump is arranged on the return pipe.

2. A synthetic production system for monoethanolamine benzoate according to claim 1, characterized in that: The centrifuge is a vertical centrifugal discharge filter guide centrifuge.

3. A synthetic production system for monoethanolamine benzoate according to claim 1, characterized in that: The automatic control valve is an electric valve or a pneumatic valve.

4. A synthetic production system for monoethanolamine benzoate according to claim 1, characterized in that: The bottom of the intermediate tank is provided with a fault drain port, which is connected to the mother liquid tank.

5. A synthetic production system for monoethanolamine benzoate according to claim 1, characterized in that: The reactor is a double-layer glass reactor with a stirrer.

6. A synthetic production system for monoethanolamine benzoate according to claim 1, characterized in that: The reactor is provided with an inert gas inlet pipe connected to a nitrogen bottle.

7. A synthetic production system for monoethanolamine benzoate according to claim 1, characterized in that: Multiple synthesis production systems are controlled by one control system to achieve continuous automated production.

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