Device for improving aldol condensation reaction conversion rate

Abstract

A device for improving aldol condensation reaction conversion rate relates to the technical field of chemical equipment and comprises a reaction tank and a heating tank, a pressure release valve, a pressure gauge, a catalyst inlet pipe, a raw material inlet pipe and a thermometer are sequentially arranged at the top of the reaction tank, the bottom of the reaction tank is arranged in the heating tank, a support frame is arranged in the heating tank, and a cooling cover and a heating plate are arranged on the support frame. The centers of the cooling cover and the heating plate penetrate through the supporting frame, the heating plate is fixed to the supporting frame, the cooling cover is slidably connected with the supporting frame, the two corners of the top of one side face of the cooling cover are connected with one end of a steel wire rope respectively, and the other end of the steel wire rope penetrates through a fixed pulley to be wound around a first roller which is connected with a first motor through a transmission shaft. The two corners of the top of the other side face of the cooling cover are also connected with one end of a steel wire rope, and the other end of the steel wire rope penetrates through the fixed pulley to be wound around a second roller which is connected with a second motor through a transmission shaft. The device for improving the aldol condensation reaction conversion rate improves the aldol condensation reaction conversion rate.

Description

Technical field:

[0001] The utility model relates to the technical field of chemical equipment, in particular to a device for improving the conversion rate of aldol condensation reaction. Background technology:

[0002] The aldol condensation reaction refers to the nucleophilic addition of an aldehyde or ketone with α-H with another aldehyde or ketone molecule under acid or base catalysis to generate β-hydroxyaldehyde or β-hydroxyketone, which can be dehydrated by heat to generate α, β-unsaturated aldehyde or ketone. Through the aldol condensation, new carbon-carbon bonds can be formed in the molecule and the carbon chain can be extended. The aldol condensation reaction also has requirements for the reaction temperature. The existing aldol condensation reaction device has slow temperature adjustment, resulting in poor conversion rate. Therefore, a device that can improve the conversion rate of the aldol condensation reaction is urgently needed. Utility model content:

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a device for improving the conversion rate of aldol condensation reaction, which can quickly adjust the temperature and improve the conversion rate of aldol condensation reaction.

[0004] In order to solve the problems existing in the background technology, the utility model adopts the following technical scheme: it comprises a reaction tank and a heating tank, the top of the reaction tank is provided with a pressure relief valve, a pressure gauge, a catalyst inlet pipe, a raw material inlet pipe and a temperature gauge in sequence, the bottom of the reaction tank is seated in the heating tank, a support frame is provided in the heating tank, a cooling cover and a heating plate are provided on the support frame, one side of the heating plate is a solid plate, a cooling cover is provided on the heating side of the heating plate, the cooling cover and the center of the heating plate pass through the support frame, the heating plate is fixed on the support frame, the cooling cover is slidably connected to the support frame, the top two corners of one side of the cooling cover are respectively connected to one end of the steel wire rope, the other end of the steel wire rope passes through the fixed pulley and is wound with roller one, the roller one is connected to motor one through a transmission shaft, the top two corners of the other side of the cooling cover are also respectively connected to one end of the steel wire rope, the other end of the steel wire rope passes through the fixed pulley and is wound with roller two, the roller two is connected to motor two through a transmission shaft, and the transmission direction of motor two is the same as that of motor one; the winding direction of the steel wire rope and roller one is opposite to the winding direction of the steel wire rope and roller two.

[0005] The support frame is door-shaped and square in structure.

[0006] There are four fixed pulleys, all of which are arranged at the bottom of the reaction tank, and the four fixed pulleys are symmetrically arranged.

[0007] The reaction tank is provided with stirring blades.

[0008] The two corners of the top of the cooling cover are respectively provided with perforations.

[0009] The cooling hood and the heating plate form a group of temperature regulating mechanisms, and at least two groups of temperature regulating mechanisms are arranged on the support frame. The steel wire rope of the cooling hood of one group of temperature regulating mechanisms passes through the through-holes of the cooling hood of the adjacent temperature regulating mechanism, and is wound around the corresponding roller one and roller two after passing through the through-holes.

[0010] The utility model has the advantages of comprehensive functions and convenient use, and the purpose of quickly adjusting the temperature is achieved through the coordinated use of the cooling cover and the heating plate, thereby improving the conversion rate of the aldol condensation reaction. Description of the drawings:

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 It is the right side view of the utility model;

[0013] Figure 3 This is a connection diagram between the support frame and the temperature regulating mechanism of the utility model. Specific implementation method:

[0014] Reference Figure 1The utility model specifically adopts the following implementation mode: it includes a reaction tank 1 and a heating tank 8, the top of the reaction tank 1 is provided with a pressure relief valve 3, a pressure gauge 4, a catalyst inlet pipe 5, a raw material inlet pipe 6 and a temperature gauge 7 in sequence, the bottom of the reaction tank 1 is seated in the heating tank 8, a support frame 11 is provided in the heating tank 8, a cooling cover 13 and a heating plate 12 are provided on the support frame 11, one side of the heating plate 12 is a solid plate, a cooling cover 13 is provided on the heating side of the heating plate 12, the cooling cover 13 and the heating plate 12 pass through the support frame 11 in the center, the heating plate 12 is fixed on the support frame 11, and the cooling cover 13 is slidably connected with the support frame 11 Then, the two corners at the top of one side of the cooling cover 13 are respectively connected to one end of the wire rope 14, the other end of the wire rope 14 passes through the fixed pulley 9 and is wound with the roller 10, the roller 10 is connected to the motor 16 through the transmission shaft, and the two corners at the top of the other side of the cooling cover 13 are also respectively connected to one end of the wire rope 14, the other end of the wire rope 14 passes through the fixed pulley 9 and is wound with the second roller 15, the second roller 15 is connected to the second motor through the transmission shaft, and the transmission direction of the second motor and the first motor 16 is the same; the winding direction of the wire rope 14 and the roller 10 is opposite to the winding direction of the wire rope 14 and the second roller 15. The support frame 11 is a door-shaped, square structure. The number of the fixed pulleys 9 is four, all of which are arranged at the bottom of the reaction tank 1, and the four fixed pulleys 9 are symmetrically arranged. The reaction tank 1 is provided with a stirring blade 2. The two corners at the top of the cooling cover 13 are respectively provided with perforations 17. One cooling cover 13 and one heating plate 12 form a set of temperature regulating mechanisms, and at least two sets of temperature regulating mechanisms are arranged on the support frame 11. The steel wire rope 14 of the cooling cover 13 of one set of temperature regulating mechanisms passes through the through hole 17 of the cooling cover 13 of the adjacent temperature regulating mechanism, and is wound with the corresponding roller 10 and roller 2 15 after passing through the through hole 17. The motor 16 and the motor 2 are connected to the external controller through wires, and the heating plate 12 is an electric heating plate.

[0015] When the device for improving the conversion rate of aldol condensation reaction is used, the pressure in the reaction tank 1 is monitored by the pressure gauge 4. If the pressure is too high, the pressure is released through the pressure relief valve 3. The reaction temperature in the reaction tank 1 is monitored by the thermometer 7 to ensure the rapid conversion of the aldol condensation reaction. The reaction raw materials are added through the raw material inlet pipe 6, and the catalyst is added through the catalyst inlet pipe 5. The raw materials and the catalyst are added separately to ensure that the items are free of impurities and the amount of addition can be measured. During the reaction, in order to better mix the raw materials and the catalyst, a stirring blade 2 is set in the reaction tank 1, which can not only play a stirring and mixing role, but also prevent the materials from sticking.

[0016] The aldol condensation reaction cannot react at room temperature and needs heating. During the reaction, the heating plate 12 is powered on, and the heat generated by the heating plate 12 heats the reaction tank 1. The temperature gauge 7 is checked to see whether the temperature meets the reaction requirements. When the temperature is too high and it is urgently needed to cool down, the motor 16 and the motor 2 are started. The motor 16 and the motor 2 rotate at the same time and in the same direction. The rotation of the motor 16 drives the roller 10 connected thereto to rotate, and the roller 10 continues to wind and tighten the steel wire rope 14 wound thereon. The rotation of the motor 2 drives The roller 2 15 connected thereto rotates, and since the winding direction of the steel wire rope 14 on the roller 2 15 is opposite to that of the steel wire rope 14 on the roller 1 10, the roller 2 15 releases the steel wire rope 14, and the steel wire rope 14 wound on the roller 1 10 pulls the cooling cover 13, and the cooling cover 13 slides on the support frame 11 and slides toward the heating plate 12 until the heating plate 12 is wrapped inside, reducing the heat dissipation space of the heating plate 12 and lowering the temperature in the heating tank 8, thereby playing a role in rapidly cooling the reaction tank 1. When the temperature needs to be raised, the motor 1 16 and the motor 2 rotate in opposite directions, the roller 2 15 tightens the steel wire rope 14, the roller 1 10 releases the steel wire rope 14, and the steel wire rope 14 connected to the roller 2 15 pulls the cooling cover 13 away from the heating plate 12, and the heating plate 12 continues to release heat to heat the reaction tank 1.

[0017] In order to ensure that the support frame 11 can support the cooling cover 13 and ensure the sliding of the cooling cover 13, the support frame 11 adopts a square structure instead of a cylindrical structure.

[0018] In order to ensure that the position of the steel wire rope 14 does not deviate when the steel wire rope 14 pulls the cooling cover, a fixed pulley 9 is specially designed, and the fixed pulley 9 plays a role of supporting the steel wire rope 14.

[0019] According to actual needs, four fixed pulleys 9 can be installed accordingly at the bottom of the heating tank 8, and a steel wire rope 14 can be installed at the two bottom corners of the cooling cover 13, so that the two bottom corners of the cooling cover 13 are respectively connected to one end of the steel wire rope 14, and the other end of the steel wire rope 14 passes through the fixed pulley 9 at the bottom of the heating tank 8 and is wound around the corresponding roller 10 and roller 2 15, and the winding method is the same as the winding method of the steel wire rope 14 at the two top corners.

[0020] Example

[0021] Taking the aldol condensation reaction of dimethylolbutyric acid as an example, firstly, an appropriate amount of formaldehyde raw material and butyraldehyde raw material are injected into the reaction tank 1 through the raw material inlet pipe 6. After the injection is completed, the stirring blade 2 is started, and the stirring blade 2 stirs the formaldehyde raw material and butyraldehyde raw material to avoid the phenomenon that the formaldehyde raw material and butyraldehyde raw material sink to the bottom. While the formaldehyde raw material and butyraldehyde raw material are stirred, the heating plate 12 in the heating tank 8 heats the reaction tank 1, so that the formaldehyde raw material and butyraldehyde raw material in the reaction tank 1 are heated, and the formaldehyde raw material and butyraldehyde raw material are preheated to 45°C, and then an appropriate amount of formaldehyde raw material and butyraldehyde raw material are injected into the reaction tank 1 through the catalyst inlet pipe 5. A catalyst is added, wherein the catalyst is a mixed solution of sodium carbonate and sodium hydroxide, and the amount thereof accounts for 1.5% of the total amount of the formaldehyde raw material and butyraldehyde raw material added, and the reaction is allowed to proceed for one hour, and then formic acid is added to neutralize the alkali. After the reaction is completed, the catalyst and by-products are removed by reduced pressure distillation at 60° C., hydrogen peroxide is added dropwise under heating conditions at 50° C., and then sodium hydroxide is added to neutralize the mixture after being kept warm at 70° C. for one hour, water is removed by reduced pressure distillation, and an appropriate amount of ethanol is added, and inorganic salts are removed by filtration, and the pH of the mother liquor is adjusted to 4 with sulfuric acid. After removing the ethanol, white crystals of dihydroxymethylbutyric acid are obtained, and the aldol condensation reaction is completed.

[0022] In summary, the device for improving the conversion rate of the aldol condensation reaction is comprehensive in function and easy to use. By using the cooling hood and the heating plate in coordination with each other, the purpose of quickly adjusting the temperature is achieved, thereby improving the conversion rate of the aldol condensation reaction.

Claims

1. A device for improving the conversion rate of aldol condensation reaction, comprising a reaction tank (1) and a heating tank (8), wherein the top of the reaction tank (1) is provided with a pressure relief valve (3), a pressure gauge (4), a catalyst inlet pipe (5), a raw material inlet pipe (6) and a temperature gauge (7) in sequence, and the bottom of the reaction tank (1) is seated in the heating tank (8), characterized in that: A support frame (11) is provided in the heating tank (8), and a cooling cover (13) and a heating plate (12) are provided on the support frame (11). One side of the heating plate (12) is a solid plate. A cooling cover (13) is provided on the heating side of the heating plate (12). The centers of the cooling cover (13) and the heating plate (12) pass through the support frame (11). The heating plate (12) is fixed on the support frame (11). The cooling cover (13) is slidably connected to the support frame (11). Two corners of the top of one side of the cooling cover (13) are respectively connected to one end of a steel wire rope (14). The other end of the steel wire rope (14) passes through the support frame (11). The cooling cover (13) is wound around the first roller (10) through the fixed pulley (9), and the first roller (10) is connected to the first motor (16) through a transmission shaft. The top two corners of the other side of the cooling cover (13) are also respectively connected to one end of the wire rope (14). The other end of the wire rope (14) passes through the fixed pulley (9) and is wound around the second roller (15). The second roller (15) is connected to the second motor through a transmission shaft. The transmission direction of the second motor and the first motor (16) is the same. The winding direction of the wire rope (14) and the first roller (10) is opposite to the winding direction of the wire rope (14) and the second roller (15).

2. A device for improving the conversion rate of aldol condensation reaction according to claim 1, characterized in that: The support frame (11) is gate-shaped and square in structure.

3. A device for improving the conversion rate of aldol condensation reaction according to claim 1, characterized in that: There are four fixed pulleys (9), all of which are arranged at the bottom of the reaction tank (1), and the four fixed pulleys (9) are symmetrically arranged.

4. The device for improving the conversion rate of aldol condensation reaction according to claim 1, characterized in that: The reaction tank (1) is provided with a stirring blade (2).

5. The device for improving the conversion rate of aldol condensation reaction according to claim 1, characterized in that: The two corners of the top of the cooling cover (13) are respectively provided with perforations (17).

6. A device for improving the conversion rate of aldol condensation reaction according to claim 1 or 5, characterized in that: One of the cooling hoods (13) and one of the heating plates (12) form a group of temperature regulating mechanisms. At least two groups of temperature regulating mechanisms are arranged on the support frame (11). The steel wire rope (14) of the cooling hood (13) of one group of temperature regulating mechanisms passes through the through hole (17) of the cooling hood (13) of the adjacent temperature regulating mechanism, and after passing through the through hole (17), it is wound around the corresponding roller one (10) and roller two (15).

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