Triethyl phosphite synthesis kettle with high reaction yield

Abstract

The utility model relates to a triethyl phosphite synthesis kettle with high reaction yield, which comprises a synthesis kettle body and is technically characterized in that a rotatable vertical pipe is arranged in the center of the synthesis kettle body, and the upper end and the lower end of the rotatable vertical pipe are connected with a first heat exchange medium outlet pipeline and a first heat exchange medium inlet pipeline through an upper rotating joint and a lower rotating joint; a heat exchange interlayer is arranged on the periphery of the synthesis kettle body, a second heat exchange medium inlet pipeline is arranged at the bottom of the heat exchange interlayer, a second heat exchange medium outlet pipeline is arranged at the top of the heat exchange interlayer, a stirring paddle is arranged at the lower part of the rotatable vertical pipe, and a plurality of first conical material blocking discs with narrow upper parts and wide lower parts are arranged at the upper part of the rotatable vertical pipe; the upper part of the inner side wall of the synthesis kettle body is provided with a plurality of second conical material blocking discs with narrow upper parts and wide lower parts, the first conical material blocking discs and the second conical material blocking discs are arranged in a staggered manner, and a continuous S-shaped material ascending channel is formed at the upper part of the synthesis kettle body. According to the utility model, the transfer timeliness of high heat generated by material reaction is further improved, and the generation of side reaction is further reduced, so that the product yield is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of triethyl phosphite production equipment, specifically to a triethyl phosphite synthesis reactor with high reaction yield. Background Technology

[0002] The production method of triethyl phosphite mainly uses anhydrous ethanol and phosphorus trichloride as raw materials, and organic amines as acid-binding agents, followed by separation and distillation to obtain triethyl phosphite. Its synthesis reaction is violently exothermic and produces a large amount of hydrogen chloride gas. Unabsorbed hydrogen chloride easily leads to side reactions, generating diethyl phosphite and chloroethane. Excessively high reaction temperatures can easily lead to an increase in byproducts, resulting in low product yield.

[0003] To address this, CN205368197U discloses a continuous synthesis apparatus for producing triethyl phosphite, comprising a reactor, a heat exchanger, and a circulating pump. The top of the reactor is connected to the inlet of the heat exchanger, and the bottom of the heat exchanger is connected to the outlet of the reaction liquid (4) and the inlet of the circulating pump. The outlet of the circulating pump is connected to the bottom of the reactor. This synthesis apparatus ensures uniform mixing of the reactants, timely removal of heat generated by the reaction, high product content per unit of reaction liquid, and few side reactions. However, the following problems still exist: the heat exchange environment inside the reactor is poor, and the timeliness of transferring the high heat generated by the reaction needs to be further improved. Utility Model Content

[0004] The purpose of this invention is to provide a triethyl phosphite synthesis reactor with a reasonable structure, reliable operation, and high reaction yield that solves the above-mentioned problems, further improves the timeliness of transferring the high heat generated by the material reaction, further reduces the generation of side reactions, and thus improves the product yield.

[0005] The technical solution of this utility model is:

[0006] A high-yield triethyl phosphite synthesis reactor includes a reactor body. The key technical features are: a rotatable vertical pipe is centrally located within the reactor body; upper and lower bearing seals are located at the top and bottom of the reactor body corresponding to the rotatable vertical pipe; the upper end of the rotatable vertical pipe is connected to a first heat exchange medium outlet pipe via an upper rotary joint; the lower end of the rotatable vertical pipe is connected to a first heat exchange medium inlet pipe via a lower rotary joint; a rotation drive mechanism is provided between the top of the reactor body and the outer wall of the upper end of the rotatable vertical pipe; a heat exchange jacket is provided on the outer peripheral wall of the reactor body; and the bottom of the heat exchange jacket... The reactor is provided with a second heat exchange medium inlet pipe and a second heat exchange medium outlet pipe at the top of the heat exchange jacket. The lower part of the rotatable riser is provided with a stirring paddle. The upper part of the rotatable riser is provided with a plurality of first conical baffles that are narrower at the top and wider at the bottom along the axial direction. The upper part of the inner sidewall of the synthesis vessel is provided with a plurality of second conical baffles that are narrower at the top and wider at the bottom along the axial direction. The first and second conical baffles are arranged alternately and form a material rising channel with a continuous S-shaped cross section at the upper part of the synthesis vessel. The top of the synthesis vessel is provided with a material intermediate outlet that communicates with the end of the material rising channel.

[0007] The above-mentioned high-yield triethyl phosphite synthesis reactor includes a rotary drive mechanism comprising a driven wheel mounted on the outer wall of the upper end of a rotatable vertical tube, a drive motor fixed to the top of the synthesis reactor body, and a drive wheel mounted on the output shaft of the drive motor and meshing with the driven wheel.

[0008] The above-mentioned high-yield triethyl phosphite synthesis reactor has a circulating material inlet on the bottom side of the reactor body. The outer end of the circulating material inlet is connected to the outlet pipe of the circulating pump. The inlet pipe of the circulating pump is connected to the outlet of the heat exchanger. The inlet pipe of the heat exchanger is connected to the intermediate outlet of the material.

[0009] The above-mentioned high-yield triethyl phosphite synthesis reactor has a raw material inlet corresponding to a stirring paddle located on the lower part of its outer wall.

[0010] The above-mentioned high-yield triethyl phosphite synthesis reactor has an upper positioning seat at the top of the reactor body corresponding to the outlet pipe of the first heat exchange medium, and a lower positioning seat at the bottom of the reactor body corresponding to the inlet pipe of the first heat exchange medium.

[0011] The beneficial effects of this utility model are:

[0012] 1. By simultaneously transferring high heat between the inside and outside of the reactants through the heat exchange medium in the rotatable riser and the heat exchange jacket, the heat dissipation efficiency is significantly improved, the generation of side reactions is further reduced, and the product yield is increased.

[0013] 2. A material rising channel with a continuous S-shaped cross-section is formed by the first conical baffle plate of the rotatable riser and the second conical baffle plate on the inner side wall of the synthesis vessel. On the one hand, this further improves the uniformity of material mixing. On the other hand, the first and second conical baffle plates are equivalent to heat exchange fins, increasing the contact area with the material, further improving the efficiency of heat transfer, reducing the generation of side reactions, and increasing product yield.

[0014] 3. This utility model is also equipped with an external heat exchanger for joint operation, which is convenient and flexible to use and improves product yield. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 yes Figure 1 Enlarged view of section A in the middle;

[0017] Figure 3 yes Figure 1 Enlarged view of section B in the middle.

[0018] In the diagram: 1. First heat exchange medium outlet pipe, 2. Upper positioning seat, 3. Synthesis vessel body, 4. Heat exchange jacket, 5. Second conical baffle plate, 6. First conical baffle plate, 7. Rotatable riser, 8. Stirring paddle, 9. Raw material inlet, 10. Second heat exchange medium inlet pipe, 11. Lower positioning seat, 12. First heat exchange medium inlet pipe, 13. Circulating material inlet, 14. Circulating pump, 15. Heat exchanger, 16. Second heat exchange medium outlet pipe, 17. Material intermediate outlet, 18. Upper rotary joint, 19. Driven wheel, 20. Driving wheel, 21. Drive motor, 22. Upper bearing seal, 23. Lower bearing seal, 24. Lower rotary joint. Detailed Implementation

[0019] The present invention will be described in detail with reference to the accompanying drawings.

[0020] like Figures 1-3 As shown, the high-yield triethyl phosphite synthesis reactor includes reactor body 3.

[0021] The synthesis vessel body 3 has a rotatable vertical tube 7 at its center, and the top and bottom of the synthesis vessel body 3 are provided with an upper bearing sealing seat 22 and a lower bearing sealing seat 23 corresponding to the rotatable vertical tube 7.

[0022] The upper end of the rotatable riser 7 is connected to the first heat exchange medium outlet pipe 1 via an upper rotary joint 18, and the lower end of the rotatable riser 7 is connected to the first heat exchange medium inlet pipe 12 via a lower rotary joint 24. A rotary drive mechanism is provided between the top of the synthesis vessel body 3 and the upper outer wall of the rotatable riser 7. In this embodiment, the top of the synthesis vessel body 3 is provided with an upper positioning seat 2 corresponding to the first heat exchange medium outlet pipe 1, and the bottom of the synthesis vessel body 3 is provided with a lower positioning seat 11 corresponding to the first heat exchange medium inlet pipe 12. The rotary drive mechanism includes a driven wheel 19 provided on the upper outer wall of the rotatable riser 7, a drive motor 21 fixed to the top of the synthesis vessel body 3, and a drive wheel 20 provided on the output shaft of the drive motor 21 and meshing with the driven wheel 19.

[0023] The outer peripheral wall of the synthesis vessel 3 is provided with a heat exchange jacket 4, the bottom of the heat exchange jacket 4 is provided with a second heat exchange medium inlet pipe 10, and the top of the heat exchange jacket 4 is provided with a second heat exchange medium outlet pipe 16.

[0024] The lower part of the rotatable riser 7 is provided with a stirring paddle 8. The upper part of the rotatable riser 7 is provided with a plurality of first conical baffles 6 that are narrower at the top and wider at the bottom along the axial direction. The upper part of the inner side wall of the synthesis vessel 3 is provided with a plurality of second conical baffles 5 that are narrower at the top and wider at the bottom along the axial direction. The first conical baffles 6 and the second conical baffles 5 are arranged alternately, and a material rising channel with a continuous S-shaped cross section is formed on the upper part of the synthesis vessel 3. The top of the synthesis vessel 3 is provided with a material intermediate outlet 17 that communicates with the end of the material rising channel.

[0025] The bottom side of the synthesis vessel 3 is provided with a circulating material inlet 13. The outer end of the circulating material inlet 13 is connected to the outlet pipe of the circulating pump 14. The inlet pipe of the circulating pump 14 is connected to the outlet of the heat exchanger 15. The inlet pipe of the heat exchanger 15 is connected to the intermediate material outlet 17. The lower part of the outer wall of the synthesis vessel 3 is provided with a raw material inlet 9 corresponding to the stirring paddle 8.

[0026] Working principle:

[0027] When in use, start the drive motor 21, which drives the rotatable riser 7 and the agitator 8 to rotate via the drive wheel 20 and the driven wheel 19.

[0028] Anhydrous ethanol, phosphorus trichloride, and ammonia enter the lower part of the synthesis vessel 3 through the corresponding raw material inlet 9 and are rapidly mixed under the action of the stirring paddle 8. As the raw materials enter, the liquid level in the synthesis vessel 3 continuously rises. During the rising process, the mixed reaction materials pass through the material rising channel with a continuous S-shaped cross section. In this channel, the first bidirectional heat exchange in the mixing process takes place, namely the bidirectional heat exchange from the second conical baffle 5 of the heat exchange jacket 4 and the first conical baffle 6 of the rotatable riser 7, which quickly removes the high heat generated during the reaction of the mixed materials.

[0029] When the liquid level reaches the middle outlet position of the material, it enters the external heat exchanger 15 through the external pipeline for a second heat exchange, further removing the high heat generated during the reaction of the mixture. Then, it is returned to the bottom of the synthesis vessel 3 via the circulating pump 14, achieving a reciprocating circulating, stirred-pipe effect. After the reaction is complete, the material is completely discharged through the circulating material inlet 13 and sent to subsequent processing steps such as water washing.

[0030] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this patent.

Claims

1. A triethyl phosphite synthesis kettle with high reaction yield, comprising a synthesis kettle body, characterized in that: The synthetic kettle body is provided with a rotatable vertical pipe in the center, the top and bottom of the synthetic kettle body are provided with upper bearing seal seat and lower bearing seal seat corresponding to the rotatable vertical pipe, the upper end of the rotatable vertical pipe is connected with the first heat exchange medium outlet pipeline by using the upper rotary joint, the lower end of the rotatable vertical pipe is connected with the first heat exchange medium inlet pipeline by using the lower rotary joint, the rotation driving mechanism is arranged between the top of the synthetic kettle body and the outer wall of the upper end of the rotatable vertical pipe, the outer peripheral wall of the synthetic kettle body is provided with a heat exchange interlayer, the bottom of the heat exchange interlayer is provided with the second heat exchange medium inlet pipeline, the top of the heat exchange interlayer is provided with the second heat exchange medium outlet pipeline, the lower part of the rotatable vertical pipe is provided with a stirring paddle, the upper part of the rotatable vertical pipe is provided with a plurality of first tapered material blocking discs with narrow upper part and wide lower part arranged along the axial direction at intervals, the inner side wall of the synthetic kettle body is provided with a plurality of second tapered material blocking discs with narrow upper part and wide lower part arranged along the axial direction at intervals, the first tapered material blocking discs and the second tapered material blocking discs are staggered arranged, and the material rising channel with continuous S-shaped cross section is formed at the upper part of the synthetic kettle body, and the material intermediate outlet is arranged at the top of the synthetic kettle body and communicated with the end of the material rising channel.

2. The triethyl phosphite synthesis reactor with high reaction yield according to claim 1, characterized in that: The rotation driving mechanism comprises a driven wheel arranged on the outer wall of the upper end of the rotatable vertical pipe, a driving motor fixed to the top of the synthetic kettle body, and a driving wheel arranged on the output shaft of the driving motor and engaged with the driven wheel.

3. The triethyl phosphite synthesis reactor of high reaction yield according to claim 1, characterized in that: The bottom side of the synthetic kettle body is provided with a circulating material inlet, the outer end of the circulating material inlet is connected with the outlet pipeline of the circulating pump, the inlet pipeline of the circulating pump is connected with the outlet of the heat exchanger, and the inlet pipeline of the heat exchanger is connected with the material intermediate outlet.

4. The triethyl phosphite synthesis reactor of high reaction yield according to claim 1, characterized in that: The outer wall of the synthetic kettle body is provided with a raw material inlet corresponding to the stirring paddle.

5. The triethyl phosphite synthesis reactor of high reaction yield according to claim 1, characterized in that: The top of the synthetic kettle body is provided with an upper positioning seat corresponding to the first heat exchange medium outlet pipeline, and the bottom of the synthetic kettle body is provided with a lower positioning seat corresponding to the first heat exchange medium inlet pipeline.

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