Process device for continuously producing potassium tert-butoxide

Abstract

The utility model discloses a process device for continuously producing potassium tert-butoxide, relates to the technical field of preparation of intermediates of chemical products, and aims to solve the problem of higher energy consumption in a circulating reboiling process of an existing rectifying tower. The reboiler is mounted in the reboiling chamber, one side of the reboiler is communicated with the lower end of the rectifying tower kettle through a runner pipe, a steam output pipe is mounted on one side of the upper end of the reboiler, and the steam output pipe penetrates through and extends to the outside of the reboiling chamber and is communicated with the rectifying tower kettle; the reboiler jacket is mounted outside the reboiler, a reboiler steam inlet pipe is mounted on one side of the front end of the reboiler jacket, and a reboiler steam return pipe is mounted on the other side of the front end of the reboiler jacket; the steam compressor is arranged on the other side of the rectifying tower base, the input end of the steam compressor is communicated with the upper end of the rectifying tower kettle through a steam outlet pipe, and the output end of the steam compressor is communicated with the reboiler jacket through a steam conveying pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical product intermediate preparation, in particular to a process device for continuously producing potassium tert-butoxide. Background Art

[0002] Potassium tert-butoxide is an important organic base. It has stronger alkalinity and activity than other potassium alcohols, so it is a good catalyst. In addition, potassium tert-butoxide is widely used in organic synthesis in chemical, pharmaceutical, pesticide and other fields, such as transesterification, condensation, rearrangement, polymerization, ring opening and the production of heavy metal orthoesters. With the development of domestic fine chemicals, potassium tert-butoxide is increasingly favored by chemical, pharmaceutical, pesticide and other industries. Potassium tert-butoxide has such a wide range of uses, so there is a large demand for high-purity potassium tert-butoxide at home and abroad.

[0003] However, potassium tert-butoxide is usually prepared by reacting tert-butanol with potassium hydroxide. However, potassium tert-butoxide is very easy to hydrolyze, so it is usually necessary to continuously separate the potassium tert-butoxide and water produced by the reaction. Cyclohexane is often introduced in industry to utilize the ternary azeotropic effect of tert-butanol, cyclohexane and water. In the preparation process of potassium tert-butoxide, cyclohexane is used as a dehydrating agent in a distillation tower to continuously perform dehydration. However, the water-carrying efficiency of cyclohexane is too low, resulting in high energy consumption in the circulation reboiling process of the distillation tower. Therefore, we propose a process device for continuously producing potassium tert-butoxide to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a process device for continuously producing potassium tert-butoxide, so as to solve the problem of high energy consumption in the existing distillation tower circulation reboiling process proposed in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical solution: a process device for continuously producing potassium tert-butoxide, comprising a distillation tower base, a reboiling chamber is installed above the distillation tower base, a distillation tower kettle is installed at the upper end of the reboiling chamber, a water vapor inlet is arranged at the lower end of one side of the distillation tower kettle, and a raw material inlet is arranged at the upper end of one side of the distillation tower kettle;

[0006] Also includes:

[0007] A reboiler is installed inside the reboiler chamber, and one side of the reboiler is connected to the lower end of the distillation tower kettle through a flow pipe, and a steam output pipe is installed on one side of the upper end of the reboiler, and the steam output pipe passes through and extends to the outside of the reboiler chamber and is connected to the distillation tower kettle;

[0008] A reboiler jacket, which is installed outside the reboiler, a reboiler steam inlet pipe is installed on one side of the front end of the reboiler jacket, and a reboiler steam return pipe is installed on the other side of the front end of the reboiler jacket;

[0009] A steam compressor is arranged on the other side of the distillation tower base, the input end of the steam compressor is connected to the upper end of the distillation tower kettle through a steam outlet pipe, and the output end of the steam compressor is connected to the reboiler jacket through a steam delivery pipe;

[0010] A condenser is installed at the rear end of the reboiler chamber, and the condenser is connected to the reboiler jacket through a solenoid valve pipeline. A reflux box is installed at the lower end of the condenser through a solenoid valve pipeline. A reflux pump is installed at one end of the reflux box. The output end of the reflux pump is connected to the still of the distillation tower through a reflux pipe.

[0011] An evaporation box is arranged at the rear end of the condenser, and the evaporation box is connected to the condenser through a solenoid valve pipeline. A molecular sieve separator is arranged at the rear end of the evaporation box, and the molecular sieve separator is connected to the evaporation box through a pipeline.

[0012] Preferably, the distillation tower kettle is internally installed with tower plates, wherein twelve tower plates are provided, the twelve tower plates are equidistantly distributed, and adjacent tower plates are staggered and oppositely arranged.

[0013] Preferably, membrane wire positioning plates are installed above and below the interior of the molecular sieve separator, multiple membrane wires are installed between the membrane wire positioning plates, a finished product outlet is provided on one side of the molecular sieve separator, and a water outlet is provided at the lower end of the molecular sieve separator.

[0014] Preferably, the membrane fiber is a RO reverse osmosis membrane.

[0015] Preferably, the reboiler jacket is in circulation communication with the steam generator via a reboiler steam inlet pipe and a reboiler steam return pipe.

[0016] Preferably, an electric heating jacket is installed on the outer wall of the evaporation box.

[0017] Preferably, a support platform is installed on the lower surface of the steam compressor, and the four corners of the lower end of the support platform are fixedly connected to the reboiler chamber through brackets.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. The utility model provides reaction conditions and preliminarily separates water and potassium tert-butoxide produced in the reaction through a distillation tower. In the process of circulating reboiler, the distilled mixed steam can be compressed by a steam compressor and sent to the reboiler jacket, and used as the subsequent main heat source, which greatly saves energy consumption and solves the problem of high energy consumption in the existing distillation tower circulating reboiler process.

[0020] 2. The utility model uses a molecular sieve separator to separate the remaining water and tert-butyl alcohol by membrane filtration and permeation, thereby improving the steam and material consumption in the water separation process in traditional production, further reducing energy consumption, and making the entire device environmentally friendly, energy-saving, and highly efficient in separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a schematic diagram of the back structure of the utility model;

[0023] Figure 3 This is a schematic diagram of the front internal structure of the utility model;

[0024] Figure 4 It is a side structural schematic diagram of the utility model;

[0025] Figure 5 This is a schematic diagram of the internal structure of the molecular sieve separator of the utility model;

[0026] In the figure: 1. distillation tower base; 2. reboiling chamber; 3. distillation tower kettle; 4. steam outlet pipe; 5. steam compressor; 6. support platform; 7. bracket; 8. steam delivery pipe; 9. reboiler steam inlet pipe; 10. reboiler steam return pipe; 11. steam output pipe; 12. condenser; 13. reflux box; 14. evaporation box; 141. electric heating jacket; 15. molecular sieve separator; 151. membrane wire positioning plate; 152. membrane wire; 153. finished product outlet; 154. water outlet; 16. reflux pipe; 17. reflux pump; 18. water vapor inlet; 19. raw material inlet; 20. tower plate; 21. reboiler; 22. reboiler jacket; 23. circulation pipe. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] See also Figure 1-5 The utility model provides an embodiment: a process device for continuously producing potassium tert-butoxide, comprising a distillation tower base 1, a reboiling chamber 2 is installed above the distillation tower base 1, a distillation tower kettle 3 is installed at the upper end of the reboiling chamber 2, a water vapor inlet 18 is arranged at the lower end of one side of the distillation tower kettle 3, and a raw material inlet 19 is arranged at the upper end of one side of the distillation tower kettle 3;

[0029] Also includes:

[0030] A reboiler 21 is installed inside the reboiler chamber 2, and one side of the reboiler 21 is connected to the lower end of the distillation tower kettle 3 through a flow pipe 23. A steam output pipe 11 is installed on one side of the upper end of the reboiler 21. The steam output pipe 11 passes through and extends to the outside of the reboiler chamber 2 and is connected to the distillation tower kettle 3.

[0031] A reboiler jacket 22 is installed outside the reboiler 21, a reboiler steam inlet pipe 9 is installed on one side of the front end of the reboiler jacket 22, and a reboiler steam return pipe 10 is installed on the other side of the front end of the reboiler jacket 22;

[0032] A steam compressor 5 is arranged on the other side of the distillation tower base 1, the input end of the steam compressor 5 is connected to the upper end of the distillation tower kettle 3 through the steam outlet pipe 4, and the output end of the steam compressor 5 is connected to the reboiler jacket 22 through the steam delivery pipe 8;

[0033] A condenser 12 is installed at the rear end of the reboiler chamber 2, and the condenser 12 is connected to the reboiler jacket 22 through a solenoid valve pipeline. A reflux box 13 is installed at the lower end of the condenser 12 through a solenoid valve pipeline. A reflux pump 17 is installed at one end of the reflux box 13. The output end of the reflux pump 17 is connected to the distillation tower kettle 3 through a reflux pipe 16.

[0034] The evaporation box 14 is arranged at the rear end of the condenser 12, and the evaporation box 14 is connected to the condenser 12 through a solenoid valve pipeline. A molecular sieve separator 15 is arranged at the rear end of the evaporation box 14, and the molecular sieve separator 15 is connected to the evaporation box 14 through a pipeline.

[0035] See also Figure 3 A tower plate 20 is installed inside the distillation tower kettle 3. There are twelve tower plates 20. The twelve tower plates 20 are evenly distributed, and adjacent tower plates 20 are staggered and oppositely arranged. A plurality of through holes are arranged in the tower plate 20 for deflecting the raw material and the reflux liquid while transferring heat between them and the steam.

[0036] See also Figure 5 Membrane wire positioning plates 151 are installed above and below the molecular sieve separator 15, and multiple membrane wires 152 are installed between the membrane wire positioning plates 151. A finished product outlet 153 is arranged on one side of the molecular sieve separator 15, and a water outlet 154 is arranged at the lower end of the molecular sieve separator 15. The membrane wire 152 is an RO reverse osmosis membrane. When the gas mixture of tert-butanol and water enters the molecular sieve separator 15, due to the different sizes of tert-butanol and water molecules, the water molecules can be adsorbed and penetrated by the membrane wire 152 under the action of pressure difference, and then flow to the lower end of the molecular sieve separator 15 and be discharged along the water outlet 154, while the tert-butanol is isolated by the membrane wire 152 and discharged from the finished product outlet 153, thereby achieving efficient separation.

[0037] See also Figure 1and Figure 3 The reboiler jacket 22 is circulated with the steam generator through the reboiler steam inlet pipe 9 and the reboiler steam return pipe 10. The steam generator provides sufficient heat energy for the initial operation of the reboiler chamber 2. After the steam refluxes, the inlet and outlet valves of the steam generator are closed, and it only serves as a heat supplement.

[0038] See also Figure 4 An electric heating jacket 141 is installed on the outer wall of the evaporation box 14 , and the electric heating jacket 141 can heat the mixture of tert-butyl alcohol and water to make it gasified and then filtered and separated by the molecular sieve separator 15 .

[0039] See also Figure 1 A support platform 6 is installed on the lower surface of the steam compressor 5. The four corners of the lower end of the support platform 6 are fixedly connected to the reboiler chamber 2 through brackets 7. The support platform 6 ensures the stability of the operation of the steam compressor 5.

[0040] Working principle: When in use, tert-butyl alcohol and an appropriate amount of potassium hydroxide are used as production raw materials, introduced into a static mixer for preliminary mixing, and then preheated in a primary preheater, and then heated in a secondary preheater so that the mixed material is above the bubble point and close to the dew point, and continuously introduced into the distillation tower kettle 3 from the raw material inlet 19, and at the same time, water vapor is introduced into the distillation tower kettle 3 from the water vapor inlet 18. During the process, steam is circulated into the reboiler jacket 22 by the steam generator to reboil and heat the liquid material at the bottom of the tower. The water vapor and the reboiler 21 work together to control the tower top temperature, so that the unreacted tert-butyl alcohol and water are distilled from the tower top by azeotropy. The distilled mixed steam is compressed by the steam compressor 5 and sent to the reboiler jacket 22, and serves as the subsequent main supply heat source. The original steam generator The valve port of the device is closed and is only used for heat supplement. The steam entering the reboiler jacket 22 enters the condenser 12 from the jacket outlet for condensation after providing heat, and is stored in the reflux box 13. It is continuously refluxed through the reflux pump 17, and the reflux ratio is 1.2. When the components in the reflux box 13 meet the requirements, it is sent to the evaporation box 14, and after being evaporated again by the electric heating jacket 141, it enters the molecular sieve separator 15. When the gaseous mixture of tert-butanol and water enters the molecular sieve separator 15, due to the different sizes of tert-butanol and water molecules, the water molecules can be adsorbed and penetrated by the membrane filaments 152 under the action of the pressure difference, and then flow to the lower end of the molecular sieve separator 15 and discharged along the water outlet 154, while the tert-butanol is isolated by the membrane filaments 152 and discharged from the finished product outlet 153, thereby achieving efficient separation.

[0041] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A process device for continuously producing potassium tert-butoxide, comprising a distillation tower base (1), a reboiling chamber (2) being installed above the distillation tower base (1), a distillation tower kettle (3) being installed at the upper end of the reboiling chamber (2), a water vapor inlet (18) being arranged at the lower end of one side of the distillation tower kettle (3), and a raw material inlet (19) being arranged at the upper end of one side of the distillation tower kettle (3); Features: Also includes: A reboiler (21) is installed inside the reboiler chamber (2), and one side of the reboiler (21) is connected to the lower end of the distillation tower kettle (3) through a circulation pipe (23); a steam output pipe (11) is installed on one side of the upper end of the reboiler (21), and the steam output pipe (11) passes through and extends to the outside of the reboiler chamber (2) and is connected to the distillation tower kettle (3); a reboiler jacket (22) installed outside the reboiler (21), a reboiler steam inlet pipe (9) installed on one side of the front end of the reboiler jacket (22), and a reboiler steam return pipe (10) installed on the other side of the front end of the reboiler jacket (22); a steam compressor (5) disposed on the other side of the distillation tower base (1), wherein the input end of the steam compressor (5) is connected to the upper end of the distillation tower kettle (3) through a steam outlet pipe (4), and the output end of the steam compressor (5) is connected to the reboiler jacket (22) through a steam delivery pipe (8); A condenser (12) is installed at the rear end of the reboiler chamber (2), and the condenser (12) is connected to the reboiler jacket (22) through a solenoid valve pipeline. A reflux box (13) is installed at the lower end of the condenser (12) through a solenoid valve pipeline. A reflux pump (17) is installed at one end of the reflux box (13). The output end of the reflux pump (17) is connected to the distillation tower kettle (3) through a reflux pipe (16); An evaporation box (14) is arranged at the rear end of the condenser (12), and the evaporation box (14) is connected to the condenser (12) through a solenoid valve pipeline. A molecular sieve separator (15) is arranged at the rear end of the evaporation box (14), and the molecular sieve separator (15) is connected to the evaporation box (14) through a pipeline.

2. A process device for continuously producing potassium tert-butoxide according to claim 1, characterized in that: The distillation tower kettle (3) is internally installed with tower plates (20), and twelve tower plates (20) are provided. The twelve tower plates (20) are evenly spaced, and adjacent tower plates (20) are staggered and oppositely arranged.

3. A process device for continuously producing potassium tert-butoxide according to claim 1, characterized in that: Membrane filament positioning plates (151) are installed above and below the interior of the molecular sieve separator (15), and a plurality of membrane filaments (152) are installed between the membrane filament positioning plates (151). A finished product outlet (153) is provided on one side of the molecular sieve separator (15), and a water outlet (154) is provided at the lower end of the molecular sieve separator (15).

4. A process device for continuously producing potassium tert-butoxide according to claim 3, characterized in that: The membrane filament (152) is a RO reverse osmosis membrane.

5. A process device for continuously producing potassium tert-butoxide according to claim 1, characterized in that: The reboiler jacket (22) is in circulation communication with the steam generator via a reboiler steam inlet pipe (9) and a reboiler steam return pipe (10).

6. A process device for continuously producing potassium tert-butoxide according to claim 1, characterized in that: An electric heating jacket (141) is installed on the outer wall of the evaporation box (14).

7. A process device for continuously producing potassium tert-butoxide according to claim 1, characterized in that: A support platform (6) is installed on the lower surface of the steam compressor (5), and the four corners of the lower end of the support platform (6) are fixedly connected to the reboiler chamber (2) through brackets (7).

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