Short-range evaporator and beta-aminopropionitrile refining system using same

Abstract

The utility model relates to a short-range evaporator and a beta-aminopropionitrile refining system applying the short-range evaporator. The short-range evaporator comprises a lower barrel, an inclined groove is formed in the inner wall of the lower barrel, a flow guide sleeve is arranged in the inclined groove and is in a circular tube shape with an axial opening, the lower end of the flow guide sleeve abuts against the groove bottom of the inclined groove, and the upper end of the flow guide sleeve extends into the upper barrel and is attached to the inner wall of the upper barrel; and the axial opening of the flow guide sleeve is over against the propionitrile residue outlet. The system further comprises a pipeline system, a propionitrile residue buffer tank, a propionitrile positive fraction buffer tank and a non-condensable gas condenser; the lower cylinder body is provided with a positive fraction outlet and a vacuum interface; the propionitrile residue outlet is communicated with a propionitrile residue buffer tank through a propionitrile residue discharge pipe; the positive fraction outlet is communicated with a propionitrile positive fraction buffer tank through a propionitrile positive fraction discharge pipe; the vacuum interface is communicated with the non-condensable gas condenser through an evaporator gas phase discharge pipe; and the condensed propionitrile collecting pipe is communicated with the non-condensable gas condenser and the propionitrile positive fraction buffer tank. The short-range evaporator is applied to a beta-aminopropionitrile refining system, so that the system structure is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of beta-aminopropionitrile production equipment, in particular to a short-path evaporator and a beta-aminopropionitrile refining system using the same. Background Art

[0002] During the production of β-aminopropionitrile, crude β-aminopropionitrile needs to be distilled and purified. The existing β-aminopropionitrile refining system uses a glass-lined still for distillation, which needs to be used in conjunction with a condenser to collect the evaporated β-aminopropionitrile. The system has a complex structure, many pipelines, and a long process. Not only is the yield low and the time consumption long, but the refining process also produces a lot of residue and high energy consumption. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a short-path evaporator and a β-aminopropionitrile refining system using the same. The short-path evaporator is applied to the β-aminopropionitrile refining system, thereby simplifying the system structure and achieving high efficiency and yield.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a short-range evaporator, comprising an upper cylinder, a lower cylinder, a driving device, a cage device, a jacket, and a tube array; the upper cylinder and the lower cylinder are butted together to form an evaporation chamber inside; the jacket is sleeved on the outer side of the upper cylinder to form a heat conduction chamber between the two; the cage device and the tube array are located in the evaporation chamber; the driving device is installed on the upper cylinder to drive the cage device to rotate; an inclined groove is provided on the inner wall of the lower cylinder to receive propionitrile slag flowing up and down from the inner wall of the upper cylinder; the tube array is located in the evaporation chamber for propionitrile condensation; a guide sleeve is provided in the inclined groove, and the guide sleeve is a circular tube with an axial opening, the lower end of which is against the bottom of the inclined groove, and the upper end extends into the upper cylinder and fits with the inner wall of the upper cylinder; the axial opening of the guide sleeve is directly opposite to the propionitrile slag outlet on the outer wall of the inclined groove.

[0005] As a preferred technical solution, the inner side of the guide sleeve is provided with a reinforcing plate, which is annular and has an outer side wall that fits and is fixedly connected to the outer side wall of the guide sleeve.

[0006] As a preferred technical solution, a plurality of through holes are evenly distributed on the reinforcing plate.

[0007] As a preferred technical solution, an inner lining tube is fixedly connected to the inner wall of the reinforcing plate, and the inner lining tube is attached to the inner wall of the inclined groove.

[0008] A β-aminopropionitrile refining system using the above short-path evaporator comprises a piping system, a propionitrile slag buffer tank, a propionitrile positive fraction buffer tank and a non-condensable gas condenser;

[0009] The pipeline system includes a propionitrile positive fraction discharge pipe, a propionitrile residue discharge pipe, an evaporator gas phase discharge pipe, and a condensed propionitrile collection pipe;

[0010] The lower cylinder is provided with a propionitrile slag outlet, a positive fraction outlet and a vacuum interface; the propionitrile slag outlet is connected to the propionitrile slag buffer tank through an propionitrile slag discharge pipe; the positive fraction outlet is connected to the propionitrile positive fraction buffer tank through an propionitrile positive fraction discharge pipe; the vacuum interface is connected to the non-condensable gas condenser through an evaporator gas phase discharge pipe; the condensed propionitrile collecting pipe is connected to the non-condensable gas condenser and the propionitrile positive fraction buffer tank, and is used for conveying the propionitrile condensed in the non-condensable gas condenser to the propionitrile positive fraction buffer tank.

[0011] As a preferred technical solution, the pipeline system also includes a crude propionitrile feed pipe, a hot water inlet pipe, a hot water return pipe, a circulating cold water inlet pipe, and a circulating cold water return pipe;

[0012] A crude propionitrile inlet is provided at the upper portion of the upper cylinder, and the crude propionitrile inlet is communicated with the crude propionitrile feed pipe;

[0013] The heat transfer cavity has a hot water outlet and a hot water inlet, which are connected to the hot water return pipe and the hot water inlet pipe respectively;

[0014] The water inlet end of the tube array is connected to the cooling water inlet, and the water outlet end is connected to the cooling water return port; the cooling water inlet is connected to the circulating cold water inlet pipe, and the cooling water return port is connected to the circulating cold water return pipe.

[0015] As a preferred technical solution, the pipeline system also includes a slag tank gas phase reflux pipe and a propionitrile tank gas phase reflux pipe;

[0016] The gaseous propionitrile in the propionitrile positive fraction buffer tank flows into the non-condensable gas condenser through the propionitrile tank gas phase reflux pipe, and the gaseous propionitrile in the propionitrile slag buffer tank flows into the non-condensable gas condenser through the slag tank gas phase reflux pipe.

[0017] As a preferred technical solution, the propionitrile residue outlet, vacuum interface and positive fraction outlet are arranged in sequence from top to bottom.

[0018] As a preferred technical solution, the pipeline system also includes a slag pot discharge pipe, a propionitrile discharge pipe, a propionitrile reflux pipe and a propionitrile slag reflux pipe;

[0019] The slag tank discharge pipe is used to discharge the propionitrile slag temporarily stored in the propionitrile slag buffer tank;

[0020] The propionitrile slag reflux pipe is connected to the slag tank discharge pipe and the propionitrile slag buffer tank, so that the output propionitrile slag can be transported back to the propionitrile slag buffer tank;

[0021] The propionitrile temporarily stored in the propionitrile positive fraction buffer tank is output through the propionitrile discharge pipe; the propionitrile reflux pipe connects the propionitrile discharge pipe and the propionitrile positive fraction buffer tank, so that the output propionitrile can be refluxed into the propionitrile positive fraction buffer tank.

[0022] Due to the adoption of the above technical solution, the short-path evaporator and the β-aminopropionitrile refining system using the short-path evaporator have the following advantages:

[0023] 1) The short-path evaporator is applied in the β-aminopropionitrile refining system, which simplifies the system structure and has high efficiency and yield;

[0024] 2) Adaptability improvement is made to the short-path evaporator. Due to the different pressure difference between the inside and outside of the short-path evaporator, higher requirements are put forward for the sealing of the joint surface between the upper cylinder and the lower cylinder. In this application, a guide sleeve is provided, which blocks the joint surface between the upper cylinder and the lower cylinder, and can guide the propionitrile residue to flow into the chute. There is only a small amount of propionitrile residue or no propionitrile residue at the joint between the upper cylinder and the lower cylinder. In this way, the sealing pressure of the joint surface can be reduced, and the sealing requirements can be reduced.

[0025] 3) The guide sleeve has a simple structure and good stability. It is supported by the existing inclined grooves in the short-path evaporator. The structure is simple and reasonable, and it is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 It is a flow chart of the β-aminopropionitrile refining system;

[0028] Figure 2 It is a schematic diagram of the structure of a short-path evaporator;

[0029] Figure 3 It is a schematic diagram of the structure of the guide sleeve from the first perspective;

[0030] Figure 4 It is a schematic diagram of the structure of the guide sleeve from the second perspective.

[0031] In the figure:

[0032] 101-pipeline system includes crude propionitrile feed pipe; 102-hot water inlet pipe; 103-hot water return pipe; 104-circulating cold water inlet pipe; 105-circulating cold water return pipe; 106-propionitrile slag discharge pipe; 107-slag tank gas phase reflux pipe; 108-propionitrile tank gas phase reflux pipe; 109-slag tank discharge pipe; 110-propionitrile discharge pipe; 111-evaporator gas phase discharge pipe; 112-propionitrile positive fraction discharge pipe; 113-propionitrile reflux pipe; 114-propionitrile slag reflux pipe; 115-condensed propionitrile collection pipe; 116-vacuum exhaust pipe;

[0033] 2-short-path evaporator; 201-driving device; 202-crude propionitrile inlet; 203-hot water outlet; 204-jacket; 205-cage device; 206-upper cylinder; 207-hot water inlet; 208-flow guide sleeve; 209-propionitrile slag outlet; 210-chute; 211-vacuum interface; 212-lower cylinder; 213-cooling water inlet; 214-positive fraction outlet; 215-tube; 216-cooling water return port; 217-collection shell; 218-reinforcement plate; 219-axial opening; 220-liner;

[0034] 3-propionitrile slag buffer tank; 4-propionitrile positive fraction buffer tank; 5-non-condensable gas condenser. DETAILED DESCRIPTION

[0035] A β-aminopropionitrile refining system Figure 1 As shown, it includes a piping system, a short-path evaporator 2, a propionitrile slag buffer tank 3, a propionitrile positive fraction buffer tank 4, and a non-condensable gas condenser 5; the piping system includes a crude propionitrile feed pipe 101, a hot water inlet pipe 102, a hot water return pipe 103, a circulating cold water inlet pipe 104, a circulating cold water return pipe 105, a propionitrile slag discharge pipe 106, a slag tank gas phase reflux pipe 107, a propionitrile tank gas phase reflux pipe 108, a slag tank discharge pipe 109, a propionitrile discharge pipe 110, an evaporator gas phase discharge pipe 111, a propionitrile positive fraction discharge pipe 112, a propionitrile reflux pipe 113, a propionitrile slag reflux pipe 114 and a condensed propionitrile collecting pipe 115.

[0036] like Figure 2 As shown, the short-path evaporator 2 includes an upper cylinder 206 and a lower cylinder 212, which are butt-jointed and fixedly connected via a flange; an evaporation chamber is formed inside.

[0037] A driving device 201 is fixedly installed on the upper end of the upper cylinder 206, and a rotating cage device 205 is provided in the evaporation chamber, and the driving device 201 drives the rotating cage device 205 to rotate. A crude propionitrile inlet 202 is provided on the upper part of the upper cylinder 206, and the crude propionitrile inlet 202 is communicated with the crude propionitrile feed pipe 101. The crude propionitrile enters the upper cylinder 206, and under the action of the rotating cage device 205, the crude propionitrile forms a film on the inner wall of the upper cylinder 206. A jacket 204 is sleeved on the outer side of the upper cylinder 206, and a heat conduction cavity is formed between the jacket 204 and the upper cylinder 206. The heat conduction cavity has a hot water outlet 203 and a hot water inlet 207, which are respectively connected to the hot water return pipe 103 and the hot water inlet pipe 102. The high-temperature water in the heat conduction cavity heats the upper cylinder 206, thereby evaporating the crude propionitrile film.

[0038] A chute 210 is provided on the inner wall of the lower cylinder 212 for receiving propionitrile slag flowing up and down from the inner wall of the upper cylinder 206. A propionitrile slag outlet 209 is provided on the lower cylinder 212, and the propionitrile slag outlet 209 is located on the outer wall of the chute 210, connecting the chute 210 and the propionitrile slag discharge pipe 106, and the propionitrile slag is transported to the propionitrile slag buffer tank 3 through the propionitrile slag discharge pipe 106. The slag tank discharge pipe 109 is used to output the propionitrile slag temporarily stored in the propionitrile slag buffer tank 3.

[0039] A guide sleeve 208 is provided in the chute 210. Figure 3 and Figure 4 As shown, the guide sleeve 208 is a circular tube with an axial opening 219, that is, the cross section of the guide sleeve 208 is C-shaped; its lower end is against the bottom of the chute 210, and the upper end extends into the upper cylinder 206 and fits with the inner wall of the upper cylinder 206. The propionitrile residue flowing downward from the inner wall of the upper cylinder 206 will flow into the chute 210 along the guide sleeve 208, and there is only a small amount of propionitrile residue or no propionitrile residue at the joint of the upper cylinder 206 and the lower cylinder 212. In this way, the sealing pressure of the joint surface can be reduced and the sealing requirements can be reduced. The axial opening 219 of the guide sleeve 208 is directly opposite to the propionitrile residue outlet 209 to allow the propionitrile residue to be discharged normally.

[0040] Further, the inner side of the guide sleeve 208 has a reinforcing plate 218, which is annular, and its outer side wall is fitted and fixedly connected with the outer side wall of the guide sleeve 208, for example, welded and fixed as one. The reinforcing plate 218 is supported on the inner side of the guide sleeve 208, which is conducive to maintaining its shape and ensuring that it is in good contact with the inner wall of the upper cylinder 206. Optimally, a plurality of through holes are evenly distributed on the reinforcing plate 218, which can not only reduce weight and material consumption, but also allow propionitrile slag to pass through.

[0041] Preferably, an inner liner 220 is fixedly connected to the inner wall of the reinforcing plate 218 , and the inner liner 220 is attached to the inner wall of the chute 210 , so as to further improve the structural stability of the guide sleeve 208 .

[0042] A collecting shell 217 is provided in the lower cylinder 212, and the collecting shell 217 is located at the lower side of the chute 210, and is used to receive the condensed propionitrile positive fraction; a positive fraction outlet 214 is provided at the bottom of the collecting shell 217, and the positive fraction outlet 214 is connected to the propionitrile positive fraction buffer tank 4 through the propionitrile positive fraction discharge pipe 112. A vacuum interface 211 is provided on the lower cylinder 212, and the vacuum interface 211 is located between the collecting shell 217 and the chute 210, and the vacuum interface 211 is connected to the evaporator gas phase discharge pipe 111.

[0043] The evaporation chamber is provided with a tube array 215, the water inlet end of the tube array 215 is connected to the cooling water inlet 213, and the water outlet end is connected to the cooling water return port 216; the cooling water inlet 213 is connected to the circulating cold water inlet pipe 104, and the cooling water return port 216 is connected to the circulating cold water return pipe 105. Optimally, the cooling water inlet 213 and the cooling water return port 216 are both located at the lower side of the collection shell 217, and the tube array 215 passes through the collection shell 217 and extends to both sides thereof.

[0044] The gaseous propionitrile in the propionitrile positive fraction buffer tank 4 flows into the non-condensable gas condenser 5 through the propionitrile tank gas phase reflux pipe 108, the gaseous propionitrile in the propionitrile slag buffer tank 3 flows into the non-condensable gas condenser 5 through the slag tank gas phase reflux pipe 107, and the uncondensed gaseous propionitrile in the evaporation chamber flows into the non-condensable gas condenser 5 through the evaporator gas phase discharge pipe 111. In the non-condensable gas condenser 5, the condensed propionitrile is recovered to the propionitrile positive fraction buffer tank 4 through the condensed propionitrile collecting pipe 115, and the non-condensable gas condenser 5 is connected to a vacuum exhaust pipe 116 to discharge the tail gas in the non-condensable gas condenser 5. The propionitrile temporarily stored in the propionitrile positive fraction buffer tank 4 is output through the propionitrile discharge pipe 110.

[0045] The pipeline system also includes a propionitrile slag reflux pipe 114 and a propionitrile reflux pipe 113. The propionitrile slag reflux pipe 114 is connected to the slag tank discharge pipe 109 and the propionitrile slag buffer tank 3. The connection position of the propionitrile slag reflux pipe 114 and the slag tank discharge pipe 109 is located on the downstream side of the output pump of the slag tank discharge pipe 109. Controlling the valve body on the propionitrile slag reflux pipe 114 can realize the output propionitrile slag being transported back to the propionitrile slag buffer tank 3. The propionitrile reflux pipe 113 is connected to the propionitrile discharge pipe 110 and the propionitrile positive fraction buffer tank 4. The connection position of the propionitrile reflux pipe 113 and the propionitrile discharge pipe 110 is located on the downstream side of the output pump of the propionitrile discharge pipe 110. Controlling the valve body on the propionitrile reflux pipe 113 can realize the output propionitrile being refluxed into the propionitrile positive fraction buffer tank 4.

[0046] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A short-path evaporator, comprising an upper cylinder (206), a lower cylinder (212), a driving device (201), a rotating cage device (205), a jacket (204), and a tube array (215); the upper cylinder (206) and the lower cylinder (212) are butt-jointed to form an evaporation chamber inside; the jacket (204) is sleeved on the outer side of the upper cylinder (206), and a heat conduction chamber is formed between the two; the rotating cage device (205) and the tube array (215) are located in the evaporation chamber; the driving device (201) is mounted on the upper cylinder (206) and is used to drive the rotating cage device (205) to rotate; an inclined groove (210) is provided on the inner wall of the lower cylinder (212) and is used to receive propionitrile residue flowing up and down from the inner wall of the upper cylinder (206); the tube array (215) is located in the evaporation chamber and is used to condense propionitrile; and the characteristics are: A guide sleeve (208) is provided in the inclined groove (210). The guide sleeve (208) is in the shape of a circular tube with an axial opening (219), the lower end of which is against the bottom of the inclined groove (210), and the upper end of which extends into the upper cylinder (206) and fits against the inner wall of the upper cylinder (206); the axial opening (219) of the guide sleeve (208) is directly opposite to the propionitrile residue outlet (209) on the outer wall of the inclined groove (210).

2. A short path evaporator according to claim 1, characterized in that: The inner side of the guide sleeve (208) is provided with a reinforcing plate (218); the reinforcing plate (218) is annular, and its outer side wall is in contact with and fixedly connected to the outer side wall of the guide sleeve (208).

3. A short path evaporator according to claim 2, characterized in that: The reinforcing plate (218) is evenly distributed with a plurality of through holes.

4. A short path evaporator according to claim 1, characterized in that: An inner lining tube (220) is fixedly connected to the inner wall of the reinforcing plate (218), and the inner lining tube (220) is attached to the inner side wall of the inclined groove (210).

5. A β-aminopropionitrile refining system using the short-path evaporator according to any one of claims 1 to 4, characterized in that: It comprises a pipeline system, a propionitrile slag buffer tank (3), a propionitrile positive fraction buffer tank (4) and a non-condensable gas condenser (5); The pipeline system comprises a propionitrile positive fraction discharge pipe (112), a propionitrile residue discharge pipe (106), an evaporator gas phase discharge pipe (111), and a condensed propionitrile collection pipe (115); The lower cylinder (212) is provided with a propionitrile slag outlet (209), a positive fraction outlet (214) and a vacuum interface (211); the propionitrile slag outlet (209) is connected to the propionitrile slag buffer tank (3) through a propionitrile slag discharge pipe (106); the positive fraction outlet (214) is connected to the propionitrile positive fraction buffer tank (4) through a propionitrile positive fraction discharge pipe (112); the vacuum interface (211) is connected to the non-condensable gas condenser (5) through an evaporator gas phase discharge pipe (111); and the condensed propionitrile collection pipe (115) is connected to the non-condensable gas condenser (5) and the propionitrile positive fraction buffer tank (4) and is used to transport the propionitrile condensed in the non-condensable gas condenser (5) to the propionitrile positive fraction buffer tank (4).

6. The β-aminopropionitrile refining system according to claim 5, characterized in that: The pipeline system also includes a crude propionitrile feed pipe (101), a hot water inlet pipe (102), a hot water return pipe (103), a circulating cold water inlet pipe (104), and a circulating cold water return pipe (105); A crude propionitrile inlet (202) is provided at the upper portion of the upper cylinder (206), and the crude propionitrile inlet (202) is connected to the crude propionitrile feed pipe (101); The heat transfer cavity has a hot water outlet (203) and a hot water inlet (207), which are respectively connected to the hot water return pipe (103) and the hot water inlet pipe (102); The water inlet end of the tube array (215) is connected to the cooling water inlet (213), and the water outlet end is connected to the cooling water return port (216); the cooling water inlet (213) is connected to the circulating cold water inlet pipe (104), and the cooling water return port (216) is connected to the circulating cold water return pipe (105).

7. The β-aminopropionitrile refining system according to claim 5, characterized in that: The pipeline system also includes a slag tank gas phase reflux pipe (107) and a propionitrile tank gas phase reflux pipe (108); The gaseous propionitrile in the propionitrile positive fraction buffer tank (4) flows into the non-condensable gas condenser (5) through the propionitrile tank gas phase reflux pipe (108), and the gaseous propionitrile in the propionitrile slag buffer tank (3) flows into the non-condensable gas condenser (5) through the slag tank gas phase reflux pipe (107).

8. The β-aminopropionitrile refining system according to claim 5, characterized in that: The propionitrile residue outlet (209), the vacuum interface (211) and the positive fraction outlet (214) are arranged in sequence from top to bottom.

9. The β-aminopropionitrile refining system according to claim 5, characterized in that: The pipeline system also includes a slag pot discharge pipe (109), a propionitrile discharge pipe (110), a propionitrile reflux pipe (113) and a propionitrile slag reflux pipe (114); The slag tank discharge pipe (109) is used to discharge the propionitrile slag temporarily stored in the propionitrile slag buffer tank (3); The propionitrile slag reflux pipe (114) is connected to the slag tank discharge pipe (109) and the propionitrile slag buffer tank (3), so that the outputted propionitrile slag can be transported back to the propionitrile slag buffer tank (3); The propionitrile temporarily stored in the propionitrile positive fraction buffer tank (4) is discharged through the propionitrile discharge pipe (110); the propionitrile reflux pipe (113) is connected to the propionitrile discharge pipe (110) and the propionitrile positive fraction buffer tank (4), so that the output propionitrile can be refluxed into the propionitrile positive fraction buffer tank (4).

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