A high-purity propylenediamine continuous distillation device

Abstract

This utility model discloses a high-purity propylenediamine continuous distillation device, relating to the field of propylenediamine distillation technology. The device includes an inner liner and a heat insulation component fixedly mounted on the surface of the inner liner. Through the inner liner and secondary distillation vessel, the first heating plate heats the propylenediamine raw material within the inner liner after being energized. A rock wool layer provides insulation, reducing heat loss and improving energy efficiency. A protective outer shell protects the inner liner from damage and extends its service life. The heating temperature is the boiling point of propylenediamine, allowing gaseous propylenediamine to be transported to the secondary distillation vessel through the propylenediamine discharge pipe. Heavy component impurities remain in the inner liner. A second heating plate heats the secondary distillation vessel at a temperature higher than the boiling point of the light component impurities but lower than the boiling point of propylenediamine, continuously performing secondary distillation to further remove impurities from the propylenediamine and improve its purity.

Description

Technical Field

[0001] This utility model relates to the field of propylene distillation technology, specifically to a high-purity propylene distillation continuous distillation device. Background Technology

[0002] Propylene diamine is an organic compound, a colorless and transparent liquid, readily soluble in water, and soluble in methanol and diethyl ether. In the production and processing of propylene diamine, the raw material needs to be purified using distillation equipment.

[0003] The utility model patent with announcement number CN206045453U discloses a high-efficiency distillation system for crude propylenediamine. This utility model's high-efficiency distillation system for crude propylenediamine undergoes two-stage distillation, resulting in high working efficiency, high product purity, and high yield.

[0004] However, this high-efficiency distillation system for crude propylenediamine is not conducive to recovering and reusing the heat generated during the first distillation, and the second distillation consumes more energy, increasing production costs. Utility Model Content

[0005] The purpose of this invention is to provide a high-purity propylenediamine continuous distillation device to solve the problem mentioned in the background art of the inconvenience of recovering and reusing the heat generated by primary distillation.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-purity propylenediamine continuous distillation device, comprising an inner liner, and further comprising: a heat insulation component fixedly disposed on the surface of the inner liner; a servo motor fixedly installed on the bottom surface of the inner liner; a mixing auger fixedly disposed at the output end of the servo motor; a top cover disposed on the top surface of the inner liner, the top surface of the top cover being connected to an exhaust pipe; one end of the exhaust pipe being connected to a heat exchange pipe; a preheating oil tank fixedly disposed on the surface of the heat exchange pipe; and a secondary distillation vessel disposed on the top surface of the preheating oil tank, wherein cavities are formed on both sides of the inner wall of the secondary distillation vessel, and a second heating plate is fixedly disposed inside the cavity.

[0007] As a preferred technical solution of this utility model, the heat insulation component includes a rock wool layer and a protective shell. The rock wool layer is fixedly disposed on the surface of the inner liner layer, and the protective shell is fixedly disposed on the surface of the rock wool layer. The rock wool layer is used for heat insulation, and the protective shell serves a protective function.

[0008] As a preferred embodiment of this utility model, an installation cavity is provided on both sides of the inner wall of the inner liner, and a first heating plate is fixedly installed inside the installation cavity to heat the propylenediamine raw material.

[0009] As a preferred embodiment of this utility model, a propylene diamine discharge pipe is connected to the middle of the surface of the inner liner, and one end of the propylene diamine discharge pipe is connected to the interior of the secondary distillation vessel. The propylene diamine discharge pipe is used to transport gaseous propylene diamine.

[0010] As a preferred embodiment of this utility model, a temperature controller is electrically connected to one side of both the first heating plate and the second heating plate. The temperature controller is fixedly installed on the outer surface of the heat insulation component and is used to control the heating temperature of the first heating plate and the second heating plate.

[0011] As a preferred technical solution of this utility model, a drain pipe is provided through the bottom of the surface of the secondary distillation kettle, and a valve is fixedly installed on the surface of the drain pipe. The drain pipe is used to discharge the distilled propylenediamine.

[0012] As a preferred embodiment of this utility model, the top surface of the secondary distillation vessel is fitted with a cover plate, and the top of the cover plate is connected to an exhaust pipe, which facilitates exhaust.

[0013] As a preferred embodiment of this utility model, the bottom surfaces of the inner liner and the secondary distillation vessel are both fixedly equipped with support legs. The support legs are in four groups and arranged in a circular array. The support legs are used to support the inner liner and the secondary distillation vessel.

[0014] Compared with the prior art, this utility model provides a high-purity propylenediamine continuous distillation device, which has the following beneficial effects: 1. This high-purity propylene diamine continuous distillation equipment, through the setting of an inner liner and a secondary distillation vessel, heats the propylene diamine raw material in the inner liner after the first heating plate is energized. The rock wool layer provides insulation, reducing heat loss and saving energy. The protective shell protects the inner liner from damage, thus extending its service life. The heating temperature is the boiling point of propylene diamine, allowing the gaseous propylene diamine to be transported to the secondary distillation vessel through the propylene diamine discharge pipe. Heavy component impurities remain in the inner liner. The second heating plate heats the secondary distillation vessel at a temperature higher than the boiling point of light component impurities but lower than the boiling point of propylene diamine, continuously performing secondary distillation to further remove impurities from the propylene diamine and improve its purity.

[0015] 2. This high-purity propylene diamine continuous distillation equipment, through the setting of heat exchange tubes and preheating oil tank, allows light component impurities generated in the primary distillation to be transported to the heat exchange tubes through the exhaust pipe and exchange heat with the heat transfer oil in the preheating oil tank. The preheating oil tank preheats the secondary distillation kettle, further reducing energy consumption and saving production costs.

[0016] 3. This high-purity propylene diamine continuous distillation equipment, through the setting of a mixing auger, allows the servo motor to drive the mixing auger to stir the propylene diamine raw material during each distillation, so that the propylene diamine raw material can be heated evenly, thereby improving the distillation efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the heat exchange tube structure of this utility model; Figure 3 This is a schematic diagram of the inner liner and the first heating plate of this utility model; Figure 4 This is a schematic diagram of the hybrid auger rod structure of this utility model; Figure 5 This is a schematic diagram of the secondary distillation vessel of this utility model.

[0018] In the diagram: 1. Inner liner; 2. Insulation assembly; 201. Rock wool layer; 202. Protective outer shell; 3. Servo motor; 4. Mixing auger rod; 5. Top cover; 6. Exhaust pipe; 7. Heat exchanger tube; 8. Preheating oil tank; 9. Secondary distillation kettle; 10. Second heating plate; 11. First heating plate; 12. Propylene diamine discharge pipe; 13. Drain pipe; 14. Cover plate; 15. External drain pipe; 16. Support leg. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figures 1-5 This utility model discloses a high-purity propylene diamine continuous distillation device, including an inner liner 1, and further including: a heat insulation component 2 fixedly disposed on the surface of the inner liner 1, a servo motor 3 fixedly installed on the bottom surface of the inner liner 1, and a mixing auger 4 fixedly disposed at the output end of the servo motor 3; through the setting of the mixing auger 4, during one distillation, the servo motor 3 drives the mixing auger 4 to stir the propylene diamine raw material, so that the propylene diamine raw material can be heated evenly, thereby improving the distillation efficiency; A top cover 5 is installed on the top surface of the inner liner layer 1. An exhaust pipe 6 is connected to the top surface of the top cover 5. One end of the exhaust pipe 6 is connected to a heat exchange pipe 7. A preheating oil tank 8 is fixedly installed on the surface of the heat exchange pipe 7. Through the arrangement of the heat exchange pipe 7 and the preheating oil tank 8, the light component impurities generated by the primary distillation are transported to the heat exchange pipe 7 through the exhaust pipe 6 and exchange heat with the heat transfer oil in the preheating oil tank 8. The preheating oil tank 8 preheats the secondary distillation kettle 9, further reducing energy consumption and saving production costs. The secondary distillation vessel 9, located on the top surface of the preheating oil tank 8, heats the propylene diamine raw material in the inner liner 1 through the inner liner 1 and the secondary distillation vessel 9. The first heating plate 11 heats the propylene diamine raw material in the inner liner 1 after being energized. The rock wool layer 201 provides insulation and reduces heat loss, making it more energy-efficient. The protective shell 202 protects the inner liner 1 from damage and affects its service life. The heating temperature is the boiling point of propylene diamine, so that the gaseous propylene diamine is transported to the secondary distillation vessel 9 through the propylene diamine discharge pipe 12. The second heating plate 10 heats the secondary distillation vessel 9 at a temperature higher than the boiling point of light component impurities but lower than the boiling point of propylene diamine, continuously performing secondary distillation to further remove impurities from the propylene diamine and improve its purity. Cavities are opened on both sides of the inner wall of the secondary distillation vessel 9, and the second heating plate 10 is fixedly installed inside the cavity.

[0021] Specifically, the heat insulation component 2 includes a rock wool layer 201 and a protective shell 202. The rock wool layer 201 is fixedly disposed on the surface of the inner liner layer 1, and the protective shell 202 is fixedly disposed on the surface of the rock wool layer 201.

[0022] In this implementation plan, the rock wool layer 201 provides thermal insulation, reduces heat loss, and is more energy-efficient, while the protective outer shell 202 protects the inner liner layer 1.

[0023] Specifically, an installation cavity is provided on both sides of the inner wall of the inner liner 1, and a first electric heating plate 11 is fixedly installed inside the installation cavity.

[0024] In this embodiment, the first heating plate 11 heats the propylene diamine raw material in the inner liner 1.

[0025] Specifically, a propylene diamine discharge pipe 12 is connected to the middle of the surface of the inner liner 1, and one end of the propylene diamine discharge pipe 12 is connected to the interior of the secondary distillation vessel 9.

[0026] In this embodiment, the propylene diamine discharge pipe 12 is used to transport gaseous propylene diamine into the secondary distillation vessel 9.

[0027] Specifically, a temperature controller is electrically connected to one side of both the first heating plate 11 and the second heating plate 10, and the temperature controller is fixedly installed on the outer surface of the heat insulation component 2.

[0028] In this embodiment, the temperature controller is used to control the heating temperature of the first heating plate 11 and the second heating plate 10.

[0029] Specifically, a drain pipe 13 is provided through the bottom of the surface of the secondary distillation vessel 9, and a valve is fixedly installed on the surface of the drain pipe 13.

[0030] In this embodiment, the drain pipe 13 is used to discharge propylenediamine after secondary distillation.

[0031] Specifically, a cover plate 14 is snapped onto the top surface of the secondary distillation vessel 9, and an external drain pipe 15 is connected to the top of the cover plate 14.

[0032] In this embodiment, the external discharge pipe 15 is used to discharge light component impurities.

[0033] Specifically, the bottom surfaces of the inner liner 1 and the secondary distillation vessel 9 are both fixedly equipped with support legs 16, which are arranged in four groups in a circular array.

[0034] In this embodiment, the support leg 16 is used to support the inner liner 1 and the secondary distillation vessel 9.

[0035] The working principle and usage process of this utility model are as follows: First, after the first electric heating plate 11 is powered on, it heats the propylene diamine raw material in the inner liner layer 1. The rock wool layer 201 provides heat insulation and reduces heat loss, making it more energy-efficient. The protective shell 202 protects the inner liner layer 1 to prevent damage and affect its service life. Then, the servo motor 3 drives the mixing screw 4 to stir the propylene diamine raw material, so that the propylene diamine raw material can be heated evenly and the distillation efficiency is improved. Subsequently, the gaseous propylenediamine is transported to the secondary distillation vessel 9 through the propylenediamine discharge pipe 12. The light component impurities generated by the primary distillation are transported to the heat exchange pipe 7 through the exhaust pipe 6 and exchange heat with the heat transfer oil in the preheating oil tank 8. The preheating oil tank 8 preheats the secondary distillation vessel 9, further reducing energy consumption and saving production costs. Then, the second electric heating plate 10 heats the secondary distillation vessel 9 at a temperature higher than the boiling point of the light component impurities but lower than the boiling point of propylenediamine, and the secondary distillation is carried out continuously to further remove impurities from propylenediamine and improve the purity of propylenediamine.

[0036] In summary, this high-purity propylene diamine continuous distillation equipment heats the propylene diamine raw material in the inner liner 1 after the first heating plate 11 is energized. The rock wool layer 201 provides thermal insulation, and the protective shell 202 protects the inner liner 1. The servo motor 3 drives the mixing auger rod 4 to stir the propylene diamine raw material. The gaseous propylene diamine is transported to the secondary distillation vessel 9 through the propylene diamine discharge pipe 12. The light component impurities generated in the primary distillation are transported to the heat exchange pipe 7 through the exhaust pipe 6 and exchange heat with the heat transfer oil in the preheating oil tank 8. The preheating oil tank 8 preheats the secondary distillation vessel 9. The second heating plate 10 heats the secondary distillation vessel 9 at a temperature higher than the boiling point of the light component impurities but lower than the boiling point of propylene diamine, thus continuously performing secondary distillation.

[0037] It should be noted that, in this document, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuous rectification apparatus for high purity propylene diamine comprising an inner tank layer (1), characterized in that, Also includes: A heat insulation component (2) is fixedly installed on the surface of the inner liner layer (1), a servo motor (3) is fixedly installed on the bottom surface of the inner liner layer (1), and a hybrid auger rod (4) is fixedly installed at the output end of the servo motor (3). A top cover (5) is provided on the top surface of the inner liner layer (1). The top surface of the top cover (5) is connected to an exhaust pipe (6). One end of the exhaust pipe (6) is connected to a heat exchange pipe (7). A preheating oil tank (8) is fixedly provided on the surface of the heat exchange pipe (7). A secondary distillation vessel (9) is set on the top surface of the preheating oil tank (8). Both sides of the inner wall of the secondary distillation vessel (9) are provided with cavities, and a second electric heating plate (10) is fixedly installed inside the cavity.

2. The continuous rectification apparatus for high purity propylene diamine according to claim 1, characterized in that: The heat insulation component (2) includes a rock wool layer (201) and a protective shell (202). The rock wool layer (201) is fixedly disposed on the surface of the inner liner layer (1), and the protective shell (202) is fixedly disposed on the surface of the rock wool layer (201).

3. The continuous rectification apparatus for high purity propylene diamine according to claim 1, characterized in that: The inner wall of the inner liner (1) has installation cavities on both sides, and a first electric heating plate (11) is fixedly installed inside the installation cavity.

4. The continuous rectification apparatus for high purity propylene diamine according to claim 1, characterized in that: The inner liner (1) has a propylene diamine discharge pipe (12) connected to the middle of its surface, and one end of the propylene diamine discharge pipe (12) is connected to the interior of the secondary distillation vessel (9).

5. The continuous rectification apparatus for high purity propylene diamine according to claim 3, characterized in that: Temperature controllers are electrically connected to one side of both the first heating plate (11) and the second heating plate (10), and the temperature controllers are fixedly installed on the outer surface of the heat insulation component (2).

6. The continuous rectification apparatus for high purity propylene diamine according to claim 1, characterized in that: A drain pipe (13) is provided through the bottom of the surface of the secondary distillation vessel (9), and a valve is fixedly installed on the surface of the drain pipe (13).

7. The continuous rectification apparatus for high purity propylene diamine according to claim 1, characterized in that: The top surface of the secondary distillation vessel (9) is fitted with a cover plate (14), and the top of the cover plate (14) is connected to an external drain pipe (15).

8. The continuous rectification apparatus for high purity propylene diamine according to claim 1, characterized in that: The bottom surfaces of the inner liner (1) and the secondary distillation vessel (9) are both fixedly equipped with support legs (16), which are four groups arranged in a ring array.

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