Reaction tank for synthesizing dioctyl phthalate

Abstract

The utility model relates to a reaction tank for synthesizing dioctyl phthalate, which comprises a synthesis tank, and a fixed sleeve is arranged at the top end of the synthesis tank. The utility model relates to the technical field of dioctyl phthalate reaction tanks. According to the reaction tank for synthesis of dioctyl phthalate, during sampling, a sleeve is rotated and matched with a connecting cylinder to move the sleeve upwards, the bottom end of the sleeve is lifted upwards, the sampling cylinder is exposed, at the moment, materials in the synthesis tank enter the sampling cylinder, the sleeve is rotated again, the sleeve moves downwards and is inserted into a convex ring, and then sampling is conducted. The inner cavity of the sleeve is isolated from the inner cavity of the synthesis tank through the convex ring, then the adjusting block is rotated to be separated from the threaded ring under the matching of threads, and then the sliding rod is pulled out upwards until the sampling barrel is pulled out of the sleeve, so that the interior of the synthesis tank is always kept in a closed state in the sampling process, and the rapid loss of the temperature in the synthesis tank is avoided; the reaction efficiency is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of dioctyl phthalate reaction vessels, and in particular to a reaction vessel for the synthesis of dioctyl phthalate. Background Technology

[0002] Dioctyl phthalate is a branched side-chain alcohol ester and is one of the most widely used plasticizers.

[0003] The first step in the synthesis of dioctyl phthalate is: phthalic anhydride and isooctyl alcohol react to produce monooctyl phthalate; the second step is: monooctyl phthalate and isooctyl alcohol react to produce dioctyl phthalate. In the existing technology, the synthesis of dioctyl phthalate can be carried out continuously in the same reactor without the need to separate intermediates, saving time and energy.

[0004] However, before the second step of the synthesis reaction begins, it is necessary to check whether the first step of the synthesis reaction has been completed. In existing technologies, it is mostly necessary to open the reaction vessel for detection. However, opening the reaction vessel will cause the temperature of the reaction vessel to drop rapidly, which will reduce the efficiency of the synthesis reaction. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a reaction vessel for the synthesis of dioctyl phthalate, so as to solve the technical problems mentioned in the background art.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A reaction vessel for synthesizing dioctyl phthalate includes a synthesis vessel, a fixed sleeve at the top of the synthesis vessel, a connecting sleeve rotatably arranged inside the fixed sleeve, a sleeve threadedly connected inside the connecting sleeve, a sampler slidably arranged inside the sleeve, a connecting bracket at the upper end of the connecting sleeve, a threaded ring at the top of the connecting bracket, and an adjusting block arranged inside the threaded ring.

[0008] The sampler includes a sliding rod that is slidably disposed inside the sleeve. The bottom end of the sliding rod is provided with an inward retractor, and the bottom end of the inward retractor is provided with a sampling cylinder. The top end of the sliding rod is fixedly connected to an adjusting block, and the top end of the synthesis tank is provided with a driving structure.

[0009] Furthermore, the outer peripheral wall of the adjusting block is provided with an external thread, and the inner wall of the threaded ring is provided with an internal thread groove that mates with the external thread.

[0010] Furthermore, an injection pipe is provided on the top side of the synthesis tank, and a one-way valve is provided inside the injection pipe, with the one-way valve's conduction direction facing the inside of the synthesis tank.

[0011] Furthermore, the driving structure includes a drive motor, which is fixedly connected to the top of the synthesis tank. A drive gear is provided at the top of the drive motor, and a linkage gear ring is provided on the outer peripheral wall of the connecting cylinder, which meshes with the drive gear.

[0012] Furthermore, a convex ring is provided at the bottom of the synthesis tank. The convex ring is coaxially arranged with the sleeve, and the inner diameter of the convex ring is equal to the outer diameter of the sleeve.

[0013] Furthermore, the outer peripheral wall of the sleeve is provided with several evenly distributed stirring blades, and the top of the stirring blades has a gap with the top of the inside of the synthesis tank.

[0014] Furthermore, the synthesis tank has a heating coil inside its wall and an insulation shell on its outer wall.

[0015] In summary, this utility model has at least one of the following beneficial technical effects:

[0016] 1. A reaction vessel for the synthesis of dioctyl phthalate, wherein during sampling, the sleeve is rotated, and the connecting sleeve is used to move the sleeve upward, raising the bottom end of the sleeve and exposing the sampling cylinder. At this time, the material inside the synthesis vessel enters the interior of the sampling cylinder. The sleeve is rotated again, moving it downward and inserting it into the interior of the convex ring. The convex ring isolates the inner cavity of the sleeve from the inner cavity of the synthesis vessel. Then, the adjusting block is rotated, causing the adjusting block to disengage from the threaded ring under the engagement of the thread. The sliding rod is then pulled upward until the sampling cylinder is pulled out of the sleeve. This ensures that the interior of the synthesis vessel remains closed during the sampling process, preventing rapid temperature loss inside the synthesis vessel and thus reducing reaction efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a reaction vessel for the synthesis of dioctyl phthalate according to the present invention.

[0019] Figure 2 This is a schematic diagram of the internal structure of a reaction vessel for the synthesis of dioctyl phthalate according to the present invention.

[0020] Figure 3 This is a schematic diagram of the internal structure of the connecting tube for the synthesis of dioctyl phthalate according to this invention.

[0021] Figure 4This is a schematic diagram of the sampler of a reaction vessel for the synthesis of dioctyl phthalate according to the present invention.

[0022] Figure 5 This invention relates to a reaction vessel for the synthesis of dioctyl phthalate. Figure 2 Enlarged view of the structure at point A.

[0023] In the diagram, 1. Synthesis tank; 2. Fixed sleeve; 3. Connecting cylinder; 4. Sleeve; 5. Sampler; 51. Sliding rod; 52. Retracting rod; 53. Sampling cylinder; 6. Connecting bracket; 7. Threaded ring; 8. Adjusting block; 9. Drive structure; 91. Drive motor; 92. Drive gear; 93. Linkage gear ring; 10. External thread; 11. Internal thread groove; 12. Injection pipe; 13. Convex ring; 14. Stirring blade; 15. Heating coil. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] Example:

[0026] Reference Figure 1 - Figure 5 The present invention discloses a reaction vessel for the synthesis of dioctyl phthalate, comprising a synthesis vessel 1, a fixed sleeve 2 at the top of the synthesis vessel 1, a connecting sleeve 3 rotatably disposed inside the fixed sleeve 2, a sleeve 4 threadedly connected inside the connecting sleeve 3, a sampler 5 slidably disposed inside the sleeve 4, a connecting bracket 6 at the upper end of the connecting sleeve 3, a threaded ring 7 at the top of the connecting bracket 6, and an adjusting block 8 disposed inside the threaded ring 7.

[0027] The sampler 5 includes a sliding rod 51, which is slidably disposed inside the sleeve 4. The bottom end of the sliding rod 51 is provided with an inward retracting rod 52, and the bottom end of the inward retracting rod 52 is provided with a sampling cylinder 53. The top end of the sliding rod 51 is fixedly connected to the adjusting block 8, and the top end of the synthesis tank 1 is provided with a driving structure 9.

[0028] In this embodiment, during use, the materials required for the synthesis reaction are introduced into the interior of the synthesis tank 1 through the injection pipe 12 set at the top of the synthesis tank 1. At this time, the materials react inside the synthesis tank 1. The connecting cylinder 3 is rotated by the drive structure 9, which in turn drives the sleeve 4 to rotate. The stirring blades 14 set on the outer peripheral wall of the sleeve 4 stir the materials to improve the efficiency of the synthesis reaction. Before starting the second step reaction, a sample is taken out of the equipment by the sampler 5 for testing. After the reaction is detected to be complete, the materials required for the second step reaction are introduced into the interior of the synthesis tank 1 to carry out the second step reaction.

[0029] Specifically, during sampling, first rotate the sleeve 4. Under the action of the connecting sleeve 3 that is threaded with it, the sleeve 4 moves upward, as shown below. Figure 2 and Figure 5 As shown, at this time, the bottom end of the sleeve 4 is lifted upward, exposing the sampling cylinder 53. Since there is a gap between the sampling cylinder 53 and the sliding rod 51, the material inside the synthesis tank 1 will enter the interior of the sampling cylinder 53 through the gap. Then, the sleeve 4 is rotated again, causing the sleeve 4 to move downward and be inserted into the interior of the convex ring 13. At this time, the inner cavity of the sleeve 4 is isolated from the inner cavity of the synthesis tank 1 by the convex ring 13. Then, the adjusting block 8 is rotated, causing the adjusting block 8 to disengage from the threaded ring 7 under the engagement of the thread. Then, the sliding rod 51 is pulled upward until the sampling cylinder 53 is pulled out of the sleeve 4. The sample material is taken out through the gap between the sampling cylinder 53 and the sliding rod 51 for testing. After cleaning the sampling cylinder 53, the sliding tube and the sampling cylinder 53 are inserted back, and the adjusting block 8 and the threaded ring 7 are reset for the next sampling.

[0030] After the sample passes the test, the material required for the second step is injected through the injection tube 12. If the sample fails the test, the reaction continues until the sample passes the test.

[0031] In a further preferred embodiment of this utility model, such as Figure 3 As shown, the top of the adjusting block 8 is provided with an external thread 10, and the inner wall of the threaded ring 7 is provided with an internal thread groove 11 that is threadedly engaged with the external thread 10.

[0032] In this embodiment, the internal thread groove 11 and the external thread 10 are used to fix the adjusting block 8 and the threaded ring 7.

[0033] In a further preferred embodiment of this utility model, such as Figure 2 As shown, an injection pipe 12 is provided on the top side of the synthesis tank 1, and a one-way valve is provided inside the injection pipe 12, with the one-way valve's conduction direction facing the inside of the synthesis tank 1.

[0034] In this embodiment, the injection pipe 12 is used to fill the interior of the synthesis tank 1 with the materials required for the reaction, and the bottom wall of the synthesis tank 1 is provided with a discharge valve for discharging the materials.

[0035] In a further preferred embodiment of this utility model, such as Figure 1 As shown, the drive structure 9 includes a drive motor 91, which is fixedly connected to the top of the synthesis tank 1. A drive gear 92 is provided at the top of the drive motor 91, and a linkage gear ring 93 is provided on the outer peripheral wall of the connecting cylinder 3. The linkage gear ring 93 meshes with the drive gear 92.

[0036] In this embodiment, the drive motor 91 and drive gear 92 are used to drive the linkage gear ring 93 to rotate. Since the linkage gear ring 93 is fixedly connected to the connecting cylinder 3, it can effectively drive the connecting cylinder 3 to rotate. Since the connecting cylinder 3 and the sleeve 4 are fixedly connected by threads, the sleeve 4 can rotate with the connecting cylinder 3. In turn, the stirring blades 14 set on the outer peripheral wall of the sleeve 4 can stir the reaction materials and improve the efficiency of the synthesis reaction.

[0037] In a further preferred embodiment of this utility model, such as Figure 2 and Figure 5 As shown, a convex ring 13 is provided at the bottom of the synthesis tank 1. The convex ring 13 is coaxially arranged with the sleeve 4, and the inner diameter of the convex ring 13 is equal to the outer diameter of the sleeve 4.

[0038] In this embodiment, the convex ring 13 is used to isolate the inner cavity of the sleeve 4 from the inner cavity of the synthesis tank 1, so that the inner cavity of the sleeve 4 and the inner cavity of the synthesis tank 1 can be independent of each other, thereby ensuring the sealing of the synthesis tank 1 when the sampler 5 is pulled out.

[0039] In a further preferred embodiment of this utility model, such as Figure 2 As shown, the outer peripheral wall of the sleeve 4 is provided with a plurality of uniformly distributed stirring blades 14, and the top of the stirring blades 14 has a gap with the top of the interior of the synthesis tank 1.

[0040] In this embodiment, the stirring blade 14 is used to stir the material inside the synthesis tank 1 to improve the reaction rate and the uniformity of the reaction. The gap between the stirring blade 14 and the synthesis tank 1 is set to avoid the problem of the stirring blade 14 colliding with the synthesis tank 1 when the sleeve 4 moves up and down.

[0041] In a further preferred embodiment of this utility model, such as Figure 2 As shown, a heating coil 15 is provided inside the tank wall of the synthesis tank 1, and an insulation shell is provided on the outer wall of the synthesis tank 1.

[0042] In this embodiment, the interior of the synthesis tank 1 is heated by the heating coil 15, and the heat-insulating outer frame is used to maintain the stability of the internal temperature of the synthesis tank 1 and improve the reaction rate.

[0043] Working principle: During sampling, the sleeve 4 is rotated, and the connecting cylinder 3 is used to move the sleeve 4 upward, lifting the bottom end of the sleeve 4 and exposing the sampling cylinder 53. At this time, the material inside the synthesis tank 1 can enter the interior of the sampling cylinder 53 through the gap between the bottom end of the sampling cylinder 53 and the sliding rod 51. After waiting for a period of time to allow the material to fully enter the sampling cylinder 53, the sleeve 4 is rotated again, moving the sleeve 4 downward and inserting it into the interior of the convex ring 13. The convex ring 13 separates the inner cavity of the sleeve 4 from the inner cavity of the synthesis tank 1. At this time, the convex ring 13 separates the inner cavity of the synthesis tank 1 and the inner cavity of the sleeve 4 into two independent areas. Then, the adjusting block 8 is rotated, causing the adjusting block 8 to disengage from the threaded ring 7 under the engagement of the thread. Then, the sliding rod 51 is pulled out upward until the sampling cylinder 53 is pulled out of the sleeve 4, and the sampling is completed. During the above sampling process, the interior of the synthesis tank 1 remains closed.

[0044] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A reaction vessel for the synthesis of dioctyl phthalate, characterized in that, The system includes a synthesis tank (1), a fixed sleeve (2) is provided at the top of the synthesis tank (1), a connecting sleeve (3) is rotatably provided inside the fixed sleeve (2), a sleeve (4) is threadedly connected inside the connecting sleeve (3), a sampler (5) is slidably provided inside the sleeve (4), a connecting bracket (6) is provided at the upper end of the connecting sleeve (3), a threaded ring (7) is provided at the top of the connecting bracket (6), and an adjusting block (8) is provided inside the threaded ring (7). The sampler (5) includes a sliding rod (51), which is slidably disposed inside the sleeve (4). The bottom end of the sliding rod (51) is provided with an inward retractor (52), and the bottom end of the inward retractor (52) is provided with a sampling cylinder (53). The top end of the sliding rod (51) is fixedly connected to the adjusting block (8), and the top end of the synthesis tank (1) is provided with a driving structure (9).

2. The reaction vessel for synthesizing dioctyl phthalate according to claim 1, characterized in that, The outer peripheral wall of the adjusting block (8) is provided with an external thread (10), and the inner wall of the threaded ring (7) is provided with an internal thread groove (11) that is threadedly engaged with the external thread (10).

3. The reaction vessel for synthesizing dioctyl phthalate according to claim 2, characterized in that, An injection pipe (12) is provided on the top side of the synthesis tank (1), and a one-way valve is provided inside the injection pipe (12), with the one-way valve's conduction direction facing the inside of the synthesis tank (1).

4. The reaction vessel for synthesizing dioctyl phthalate according to claim 3, characterized in that, The drive structure (9) includes a drive motor (91), which is fixedly connected to the top of the synthesis tank (1). The top of the drive motor (91) is provided with a drive gear (92), and the outer peripheral wall of the connecting cylinder (3) is provided with a linkage gear ring (93), which meshes with the drive gear (92).

5. The reaction vessel for synthesizing dioctyl phthalate according to claim 4, characterized in that, The bottom end of the synthesis tank (1) is provided with a convex ring (13), which is coaxially arranged with the sleeve (4), and the inner diameter of the convex ring (13) is equal to the outer diameter of the sleeve (4).

6. The reaction vessel for synthesizing dioctyl phthalate according to claim 5, characterized in that, The outer peripheral wall of the sleeve (4) is provided with a number of uniformly distributed stirring blades (14), and the top of the stirring blades (14) has a gap with the top of the inside of the synthesis tank (1).

7. The reaction vessel for synthesizing dioctyl phthalate according to claim 6, characterized in that, The synthesis tank (1) is equipped with a heating coil (15) inside the tank wall and an insulation shell on the outer wall of the synthesis tank (1).

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