An esterification reactor

Abstract

The utility model discloses an esterification reation kettle, include: reation kettle, the top of reation kettle is equipped with motor, motor connects stirring shaft, and stirring shaft extends to reation kettle, and the top of reation kettle is equipped with steam input pipe, pressure relief pipe and feed pipe still, steam input pipe extends to reation kettle bottom and forms the coil portion, and the upper surface of coil portion is equipped with a plurality of gas outlet pipes at intervals, and the bottom of coil portion is equipped with support frame, and the upper portion of support frame is fixed coil portion, and the lower portion of support frame is fixed on the bottom surface of reation kettle, the tail end of stirring shaft is equipped with symmetry formula stirring vane, and the middle part of stirring shaft is equipped with spiral stirring vane, the utility model discloses the stirring vane of symmetry formula and spiral stirring vane are arranged on the stirring shaft of utility model discloses, and spiral stirring vane can convey the raw material of adding to the mixed liquid lower part in reation kettle upper portion, and then pass through the scattering of symmetry formula stirring vane, reach the effect of full mixing to improve the reaction efficiency and reduce energy consumption.

Description

Technical Field

[0001] This utility model belongs to the field of esterification reactor technology, specifically, it relates to an esterification reactor. Background Technology

[0002] Diisobutyl phthalate, also known as diisobutyl phthalate, is a colorless, transparent, oily liquid that is not easily volatile and has a slightly aromatic odor. It is flammable and toxic. The current synthesis method involves a liquid-phase esterification reaction of phthalic anhydride and isobutanol under sulfuric acid catalysis at atmospheric pressure. This method requires a large amount of isobutanol, and the acidity after esterification cannot be precisely controlled, making it impossible to reach acidity equilibrium. Therefore, isobutanol needs to be continuously added, resulting in significant cost waste, environmental friendliness, and low yield. Therefore, there is an urgent need for a highly efficient and energy-efficient method for preparing diisobutyl phthalate, along with suitable production equipment. Utility Model Content

[0003] In view of this, the technical problem to be solved by this utility model is to provide an esterification reactor that solves the problem of low stirring reaction efficiency in the prior art.

[0004] To solve the above-mentioned technical problems, this utility model discloses an esterification reactor, comprising: a reactor; a motor is provided at the top of the reactor, the motor is connected to a stirring shaft, the stirring shaft extends into the reactor, and the top of the reactor is also provided with a steam input pipe, a pressure relief pipe and a feed pipe; the steam input pipe extends to the bottom of the reactor to form a coil section, a plurality of gas outlet pipes are arranged at intervals on the upper surface of the coil section, a support frame is provided at the bottom of the coil section, the upper part of the support frame is fixed to the coil section, and the lower part of the support frame is fixed to the bottom surface of the reactor; the tail end of the stirring shaft is provided with symmetrical stirring blades, and the middle part of the stirring shaft is provided with spiral stirring blades.

[0005] Furthermore, the aforementioned support frame has a quadrilateral frame with cross-shaped struts in the middle of the frame. The ends of the struts are connected to the corners of the frame, and the corners of the frame extend downwards to form support legs.

[0006] Furthermore, the shape of its symmetrical stirring blades is semi-circular.

[0007] Furthermore, the shape of its symmetrical stirring blades is fan-shaped.

[0008] Furthermore, the aforementioned spiral stirring blades are inverted conical in shape.

[0009] Compared with the prior art, this application can achieve the following technical effects:

[0010] The stirring shaft of this invention is equipped with symmetrical stirring blades and spiral stirring blades. The spiral stirring blades can transport the raw materials added from the top of the reactor to the lower part of the mixture, and then disperse them through the symmetrical stirring blades to achieve a thorough mixing effect, thereby improving reaction efficiency and reducing energy consumption.

[0011] Of course, any product implementing this application does not necessarily need to achieve all of the technical effects described above at the same time. Attached Figure Description

[0012] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0013] Figure 1 This is a schematic diagram of a reaction vessel according to one embodiment of the present invention;

[0014] Figure 2 This is a top view of the coil section and support frame according to one embodiment of the present invention.

[0015] Attached Figure Labels

[0016] 1. Reactor; 2. Motor; 3. Stirring shaft; 4. Steam input pipe; 5. Pressure relief pipe; 6. Feed pipe; 7. Coil section; 8. Gas outlet pipe; 9. Support frame; 10. Symmetrical stirring blades; 11. Spiral stirring blades. Detailed Implementation

[0017] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0018] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of a reaction vessel according to one embodiment of the present invention; Figure 2 This is a top view of the coil section and support frame according to one embodiment of the present invention.

[0019] An esterification reactor includes: a reactor 1; a motor 2 is provided at the top of the reactor 1, the motor 2 is connected to a stirring shaft 3, the stirring shaft 3 extends into the reactor 1, the top of the reactor 1 is also provided with a steam input pipe 4, a pressure relief pipe 5 and a feed pipe 6, the steam input pipe 4 can input high-temperature steam into the reactor 1 to mix with the liquid and raise the temperature, the pressure relief pipe 5 can be opened to release pressure when the pressure in the reactor 1 is too high, and the feed pipe 6 is used to add raw materials; the steam input pipe 4 extends to the bottom of the reactor 1 to form a coil section 7, a plurality of gas outlet pipes 8 are arranged at intervals on the upper surface of the coil section 7, a support frame 9 is provided at the bottom of the coil section 7, the upper part of the support frame 9 fixes the coil section 7, and the lower part of the support frame 9 is fixed to the bottom surface of the reactor 1; the tail end of the stirring shaft 3 is provided with symmetrical stirring blades 10, and the middle part of the stirring shaft 3 is provided with spiral stirring blades 11.

[0020] The support frame 9 has a quadrilateral frame with cross-shaped struts in the middle. The ends of the struts are connected to the corners of the frame, and support feet extend downward from the corners of the frame. The coil section 7 is tied to the support frame 9 with steel wire, and the support feet on the support frame 9 are fixed to the bottom of the reactor 1 with screws.

[0021] The symmetrical stirring blade 10 is semi-circular in shape; the symmetrical stirring blade 10 is fan-shaped. The spiral stirring blade 11 is inverted conical in shape.

[0022] A method for preparing diisobutyl phthalate, characterized in that it includes:

[0023] Step a. Add the measured industrial isobutanol into the esterification reactor and turn on the stirring motor;

[0024] Step b. Add the prepared phthalic anhydride into the esterification reactor, turn on the steam coil to heat up, and at the same time open the pressure relief valve 5 to release pressure and maintain a stable pressure in the esterification reactor.

[0025] Step c. When the temperature reaches 120°C, add the catalyst and activated carbon, increase the amount of steam in the coil to continue heating, and produce an esterification reaction. After 20 minutes, open the feed pipe 6 in the esterification vessel and add thionyl chloride dropwise.

[0026] Step d. Under the action of catalyst and activated carbon, the acidity of the mixed alcohol tends to reach equilibrium and the predetermined value is reached, and the esterification is qualified to obtain diisobutyl phthalate.

[0027] The stirring shaft 3 of this utility model is equipped with symmetrical stirring blades 10 and spiral stirring blades 11. The spiral stirring blades 11 can transport the raw materials added above the reactor 1 to the lower part of the mixture, and then disperse them through the symmetrical stirring blades 10 to achieve a thorough mixing effect, thereby improving reaction efficiency and reducing energy consumption.

[0028] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. An esterification reactor, comprising: Reactor; The top of the reactor is equipped with a motor, which is connected to a stirring shaft that extends into the reactor. The top of the reactor is also equipped with a steam input pipe, a pressure relief pipe, and a feed pipe. The steam input pipe extends to the bottom of the reactor to form a coil section, and multiple gas outlet pipes are spaced apart on the upper surface of the coil section. A support frame is provided at the bottom of the coil section, the upper part of the support frame is fixed to the coil section, and the lower part of the support frame is fixed to the bottom surface of the reactor. The tail end of the stirring shaft is provided with symmetrical stirring blades, and the middle part of the stirring shaft is provided with spiral stirring blades.

2. The esterification reactor as described in claim 1, characterized in that, The support frame has a quadrilateral frame with cross-shaped struts in the middle. The ends of the struts are connected to the corners of the frame, and the corners of the frame extend downwards to form support legs.

3. The esterification reactor as described in claim 1, characterized in that, The symmetrical stirring blades are semi-circular in shape.

4. The esterification reactor as described in claim 1, characterized in that, The symmetrical stirring blades are fan-shaped.

5. The esterification reactor as described in claim 1, characterized in that, The spiral stirring blades are inverted conical in shape.

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