A reactor applied to synthesis of octadecyl acrylate

Abstract

The utility model provides a kind of reactor of synthetic octadecyl acrylate, it includes shell, shell bottom is equipped with discharge gate, top is equipped with feed inlet, gas phase outlet, solid material adding port, agitator connecting port, refrigerant inlet, refrigerant outlet, shell outside is equipped with jacket, and jacket is provided with heat medium inlet, heat medium outlet on it. Wherein, solid material adding port connects pneumatic vacuum feeder, and it is equipped with feed inlet, gas inlet, exhaust port on it;Cooling coil is equipped in shell, and agitator is driven by external motor. The utility model in octadecyl acrylate synthesis process, by taking appropriate length-diameter ratio and setting vacuum reaction environment, water in product is discharged by distillation, so that reversible reaction can always proceed to target direction, improve the conversion rate of reaction;While vacuum feeder is set on reaction kettle, and solid reactant is added to reaction kettle by airtight way, improve the cleanliness of reactant, reduce the probability of reaction product being contaminated.

Description

Technical Field

[0001] This utility model relates to a reactor for synthesizing octadecyl acrylate, belonging to the field of reactor design technology. Background Technology

[0002] Octadecyl acrylate has the molecular formula C 21 H 40 O2, possessing unsaturated double bonds and a long alkyl chain structure, is a colorless, transparent liquid. It is soluble in water, flammable, exhibits high stability and light resistance, and reacts with a variety of chemicals. As an important chemical intermediate, its colorless liquid appearance and stable chemical properties make it widely used in many fields. Some of its important applications are listed below:

[0003] Polymer Materials: Octadecyl acrylate is an important monomer used in the synthesis of various polymers. It can be copolymerized with other monomers to form polymer materials with specific properties. These polymers are commonly used in industries such as coatings, adhesives, plastics, and textiles.

[0004] Coatings and inks: Octadecyl acrylate can be used as an additive in coatings and inks. It can improve the adhesion, bonding strength, and abrasion resistance of coatings and inks. In addition, it can also improve the gloss and weather resistance of coatings.

[0005] Surfactants: Octadecyl acrylate can be used to synthesize surfactants, such as certain preservatives and emulsifiers. These surfactants can play emulsifying, dispersing, and stabilizing roles in a variety of applications.

[0006] Functional lubricants: Lubricants made from octadecyl acrylate can be used in a variety of lubrication applications, such as lubricating oils, greases, and pastes. They can reduce the coefficient of friction, improve lubrication performance, and prevent wear on metal parts.

[0007] There are many methods for synthesizing octadecyl acrylate, mainly including esterification, transesterification, and acyl chloride methods. Esterification, in particular, is a mainstream method that involves the direct esterification of acrylic acid and octadecyl alcohol under the action of a catalyst to produce octadecyl acrylate and water. This reaction requires careful attention to the following points: the reaction is reversible, necessitating timely removal of the generated water to promote further reaction; the reaction involves solid materials (octadecyl alcohol, catalyst, and polymerization inhibitor), and the manual addition of these solid materials requires consideration of contamination issues; as it is a batch reaction, the process involves heating to the reaction temperature, cooling to remove heat, and maintaining the reaction temperature. Traditional batch reactors have certain shortcomings and limitations in addressing these issues. Summary of the Invention

[0008] The technical problem to be solved by this invention is to provide a reactor that can improve reaction conversion rate, reduce the pollution impact of solid material addition, and maintain reaction temperature.

[0009] To address the aforementioned technical problems, this utility model provides a reactor for the synthesis of octadecyl acrylate, comprising a shell with a discharge port at the bottom and a feed port, gas outlet, solid material inlet, stirrer connection port, refrigerant inlet, and refrigerant outlet at the top. A jacket is provided on the outer side of the shell, with a heat medium inlet and outlet. The solid material inlet is connected to the discharge port of a pneumatic vacuum feeder, which also has a feed port, gas inlet, and exhaust port. A cooling coil and a stirrer are located inside the shell, with both ends of the cooling coil connected to the refrigerant inlet and outlet, respectively. The stirrer is connected to a motor outside the shell via a stirrer connection port. The main function of the stirrer is to promote the fusion of the solid and liquid phases of the reactants, improving the reaction conversion rate. The stirring power comes from the motor, which is frequency-controlled, allowing the stirring speed to be adjusted according to the specific reaction stage.

[0010] Preferably, the main body of the shell is a vertical cylindrical shape with elliptical end caps at both ends. The upper end cap is connected to the shell via a flange, and the lower end cap is welded to the shell. The upper end cap has a stirrer connection port, a feed port, a solid material inlet, a gas phase outlet, a refrigerant inlet, and a refrigerant outlet; the lower end cap has a discharge port. The feed port is a liquid inlet, primarily an acrylic acid feed port. If a direct esterification method is selected, a water-carrying agent feed line can also be connected.

[0011] More preferably, the main body of the shell has an aspect ratio of not less than 2.5.

[0012] Preferably, the gas phase outlet is a gas phase water outlet, which is then connected to a vacuum pump.

[0013] More preferably, the refrigerant inlet and refrigerant outlet are respectively located on both sides of the upper end cap.

[0014] Preferably, the outer shell is provided with a jacket, the jacket is provided with a flow channel, the bottom of the jacket is provided with a heat medium outlet, and the upper part is provided with a heat medium inlet.

[0015] This invention relates to a reactor for synthesizing octadecyl acrylate based on the esterification method. The functions of each component are as follows:

[0016] Stirrer connection port: Connect the stirrer. Since the reaction is between solid and liquid materials, a stirrer is needed to stir the materials to ensure a complete reaction and promote thorough mixing. The stirrer is driven by a motor with a variable frequency drive.

[0017] Feed inlet: Used for feeding liquid materials during the reaction process. The pressurized material enters the reactor through the feed inlet in a sealed manner.

[0018] Solid feed port: The solid feed port connects to a pneumatic vacuum feeder via a flange. The pneumatic vacuum feeder delivers solid reactants into the reactor, allowing for a completely closed conveying process to maintain material cleanliness and ensure the purity of the reaction products. The vacuum feeder is equipped with a vacuum generator connected to compressed air. When compressed air is supplied to the vacuum generator, it creates negative pressure, forming a vacuum airflow. The material is drawn into the suction pipe, forming a material-air flow that travels through the suction pipe to the feeder's hopper. A filter completely separates the material from the air. When the hopper is full, the controller automatically cuts off the air supply, the vacuum generator stops working, and the hopper door automatically opens, allowing the material to fall into the reactor. Simultaneously, compressed air automatically cleans the filter through a pulse backflush valve. The feeder automatically starts when the time is up or the material level sensor sends a feeding signal.

[0019] Gas phase outlet: The gas phase outlet is connected to a vacuum pump via a pipeline to provide a vacuum environment for the reaction. Combined with the control of hot and cold medium, the water generated during the reaction is extracted in the form of water vapor to promote the reaction to continue in the forward direction.

[0020] Refrigerant inlet: Connected to the cooling coil inlet inside the reactor, its main function is to connect the refrigerant pipeline, absorb the heat generated by the reaction, and control the reaction temperature;

[0021] Refrigerant outlet: Connected to the cooling coil outlet inside the reactor. Its main function is to connect the refrigerant pipeline, absorb the heat generated by the reaction, and control the reaction temperature.

[0022] Discharge port: The outlet from which all reactants are discharged after the reaction is complete;

[0023] Heat transfer medium inlet: Connected to the jacket of the reactor, externally connected to the heat transfer medium to provide heat for the reaction;

[0024] Heat medium outlet: connected to the jacket of the reactor, externally connected to the heat medium to provide heat for the reaction;

[0025] Shell: The inner cylinder of the reactor, which is the main reaction area. The length-to-diameter ratio of the cylinder is ≥2.5. Both ends are connected to elliptical heads. It is equipped with cooling coils inside and a jacket outside.

[0026] Jacket: Used to provide the heat required for the reaction;

[0027] Cooling coils: used to absorb the heat released during the reaction.

[0028] In the synthesis of octadecyl acrylate, this invention utilizes an appropriate aspect ratio and a vacuum reaction environment to remove moisture from the product through distillation, ensuring the reversible reaction continues in the target direction and improving conversion rate. Simultaneously, a vacuum feeder is installed on the reactor to add solid reactants in a sealed manner, enhancing reactant cleanliness and reducing the likelihood of product contamination. Since the reaction requires a specific temperature and is exothermic, the released heat must be promptly dissipated. An external heat transfer medium provides the necessary heat, while a cooling coil inside the reactor removes reaction heat via a cooling medium. The combined use of the cooling and heating mediums regulates and controls the reaction temperature. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the reactor provided by this utility model. Detailed Implementation

[0030] To make this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0031] Example

[0032] like Figure 1 As shown, this utility model provides a reactor for synthesizing octadecyl acrylate, which includes a shell 1. The main body of the shell 1 is a vertical cylindrical shape with elliptical end caps at both ends. The upper end cap is connected to the shell 1 via a flange, and the lower end cap is connected to the shell 1 by welding. The upper end cap is provided with a stirrer connection port 2, a feed port 7, a solid material inlet 3, a gas phase outlet 11, a refrigerant inlet 12, and a refrigerant outlet 8. The lower end cap is provided with a discharge port 13. A jacket is provided on the outer side of the cylinder, which mainly carries the heat medium. A heat medium inlet 9 is provided at the top, and a heat medium outlet 10 is provided at the bottom.

[0033] The main body of the shell 1 is a cylindrical body vertically arranged along the central axis, with elliptical end caps at both ends, and the length-to-diameter ratio of the cylindrical body is ≥2.5.

[0034] The stirrer connection port 2 and the stirrer 4 are mainly used to promote the fusion of the solid and liquid phases of the reactants and improve the conversion rate of the reaction. The stirring power comes from the motor 14 set at the top. The motor has a frequency converter and the stirring speed can be adjusted according to the specific reaction degree.

[0035] The feed inlet 7 is a liquid inlet, mainly for acrylic acid. If the direct esterification method is selected, it can also be connected to a water-carrying agent feed line.

[0036] The solid material inlet 3 is connected to the pneumatic vacuum feeder 6, which is equipped with a feeding port 17, a gas inlet 16, and an outlet 15.

[0037] The gas phase outlet 11 is a gas phase water outlet, which is connected to a vacuum pumping facility.

[0038] The refrigerant inlet 12 is located on one side of the upper end cap of the shell 1, and the refrigerant outlet 8 is located on the other side of the upper end cap; the interior is connected to both ends of the cooling coil 5 respectively.

[0039] The outer side of the shell 1 is provided with a jacket, the jacket is provided with a flow channel, the upper part is provided with a heat medium inlet 9, and the lower part is provided with a heat medium outlet 10.

[0040] This invention provides a novel octadecyl acrylate reactor. Under suitable operating conditions, the conversion rate of the reaction is improved by selecting a suitable aspect ratio, employing vacuum distillation and variable frequency motor stirring. The addition of a vacuum feeder increases the airtightness of solid materials and reduces contamination of reactants. The reaction temperature is adjusted and controlled by combining the heat medium in the reactor jacket with the refrigerant in the cooling coils inside the reactor, thereby improving reaction efficiency.

Claims

1. A reactor for synthesizing octadecyl acrylate, characterized in that, Includes a housing (1), with a discharge port (13) at the bottom and a feed port (7), a gas phase outlet (11), and a solid material inlet (3) at the top. The solid material inlet (3) is connected to the discharge port of a pneumatic vacuum feeder (6). The pneumatic vacuum feeder (6) is also provided with a feed port (17), a gas inlet (16), and an exhaust port (15). The housing (1) is equipped with a cooling coil (5) and a stirrer (4). The stirrer (4) is connected to a motor (14) outside the housing (1) through a stirrer connection port (2). The two ends of the cooling coil (5) are connected to a refrigerant inlet (12) and a refrigerant outlet (8) respectively. The refrigerant inlet (12) and the refrigerant outlet (8) are exposed from the top of the housing (1).

2. The reactor for synthesizing octadecyl acrylate as described in claim 1, characterized in that, The main body of the shell (1) is a vertical straight cylinder with elliptical end caps at both ends. The upper end cap is connected to the shell (1) through a flange, and the lower end cap is connected to the shell (1) by welding. The upper end cap is provided with a stirrer connection port (2), a feed port (7), a solid material inlet (3), a gas phase outlet (11), a refrigerant inlet (12), and a refrigerant outlet (8); the lower end cap is provided with a discharge port (13).

3. The reactor for synthesizing octadecyl acrylate as described in claim 2, characterized in that, The main body of the shell (1) has a length-to-diameter ratio of not less than 2.

5.

4. The reactor for synthesizing octadecyl acrylate as described in claim 1 or 2, characterized in that, The gas phase outlet (11) is a gas phase water outlet, which is connected to a vacuum pumping device.

5. The reactor for synthesizing octadecyl acrylate as described in claim 2, characterized in that, The refrigerant inlet (12) and refrigerant outlet (8) are respectively located on both sides of the upper end cap.

6. The reactor for synthesizing octadecyl acrylate as described in claim 1, characterized in that, The shell (1) is provided with a jacket, and the jacket is provided with a flow channel. The bottom of the jacket is provided with a heat medium outlet (10), and the top is provided with a heat medium inlet (9).

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