Acrylic acid and acrylonitrile separation distillation tower

Abstract

The utility model discloses an acrylic acid and acrylonitrile separating and distilling tower, which relates to the field of separating and distilling towers and comprises a heating barrel clamped on the upper side of a heating base and a connecting ring plate positioned above the heating barrel, a top cover disc is arranged on the upper side of the connecting ring plate, and a liquefying barrel is clamped in the middle of the upper surface of the top cover disc. The outer side of the liquefying barrel is sleeved with a condensation pipe, the two ends of the condensation pipe are fixedly connected with a liquid inlet pipe and a liquid outlet pipe respectively, an air pump is fixedly installed at the top of the liquefying barrel, an inlet and an outlet of the air pump are fixedly connected with an air suction pipe and an exhaust pipe respectively, and a heat insulation collecting barrel is arranged on the inner side of the connecting ring plate. The device has the advantages that acrylonitrile can be efficiently evaporated, meanwhile, the evaporated acrylonitrile can be circularly liquefied, the separation rate of acrylonitrile and acrylic acid is remarkably improved, the step-by-step splitting function of the separation distillation tower is realized, all parts of the separation distillation tower can be conveniently overhauled without barriers, and the operation is simple.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of separation distillation column, especially to a kind of acrylic acid and acrylonitrile separation distillation column. BACKGROUND

[0002] Acrylic acid and acrylonitrile separation distillation column is an industrial equipment for separating acrylic acid and acrylonitrile in mixed liquid. It is based on the difference in volatility of the two, by heating the mixture and using the multistage distillation process in the column, the boiling point of acrylic acid and acrylonitrile are separated. The device is widely used in chemical industry, especially in acrylic acid and acrylonitrile production, recovery and purification process.

[0003] The patent with publication number CN206549208U discloses a distillation column for separating acetone and methanol, which can maximize the liquefaction of methanol and separate it from acetone. The acetone is then condensed through a condenser. By controlling the reflux ratio of the distillation column and the water inflow of the circulating cooling water layer, the acetone can be completely separated from the methanol. The structure is simple, easy to install, and low in operation cost. However, the separation distillation column generally uses static heating to evaporate the liquid, which has low evaporation efficiency and slow liquefaction process, reducing the separation rate of acrylonitrile and acrylic acid. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a kind of acrylic acid and acrylonitrile separation distillation column. The existing separation distillation column generally uses static heating to evaporate the liquid, which has low evaporation efficiency and slow liquefaction process, reducing the separation rate of acrylonitrile and acrylic acid.

[0005] To solve the above technical problems, the technical scheme of the utility model is a kind of acrylic acid and acrylonitrile separation distillation column, which includes a heating barrel connected to the upper side of a heating base. It also includes a connecting ring plate located above the heating barrel. The upper side of the connecting ring plate is provided with a top cover disc. The middle position of the upper surface of the top cover disc is connected with a liquefaction cylinder. The outer side of the liquefaction cylinder is provided with a condenser pipe. The two ends of the condenser pipe are respectively connected with an inlet pipe and an outlet pipe. The top of the liquefaction cylinder is fixedly installed with a gas suction pump. The inlet and outlet of the gas suction pump are respectively connected with a gas suction pipe and an exhaust pipe.

[0006] The inner side of the connecting ring plate is provided with a heat insulation collection barrel. The bottom of the heat insulation collection barrel is fixedly connected with a plurality of groups of bearing rods. The outer bottom of the heat insulation collection barrel is fixedly connected with a second discharge pipe penetrating through the connecting ring plate. The inner bottom of the heat insulation collection barrel is fixedly connected with a plurality of groups of liquid guide rods. The outer top of the heating barrel is fixedly connected with an inlet pipe. The outer bottom of the heating barrel is fixedly connected with a first discharge pipe.

[0007] The heat insulation collecting barrel is provided with a heat insulation shell in the middle of the bottom, the inside of the heat insulation shell is provided with a driving motor, the output end of the driving motor is fixedly connected with a rotating vertical shaft, the outer side of the rotating vertical shaft is fixedly connected with a plurality of groups of first stirring rods, and the inner side wall of the heating barrel is fixedly connected with a plurality of groups of second stirring rods.

[0008] As a further scheme of the present application: the shape of the condensing pipe is spiral, the shape of the air suction pipe is U-shaped, and the lower ends of the air suction pipe and the exhaust pipe are located inside the liquefaction cylinder.

[0009] As a further scheme of the present application: the plurality of groups of liquid guide rods are distributed at equal intervals on the inner side of the liquefaction cylinder, and the lower ends of the plurality of groups of liquid guide rods are located inside the heat insulation collecting barrel.

[0010] As a further scheme of the present application: the plurality of groups of first stirring rods are distributed at equal intervals on the outer side of the rotating vertical shaft, the plurality of groups of second stirring rods are distributed at equal intervals on the inner side wall of the heating barrel, and the plurality of groups of first stirring rods and the plurality of groups of second stirring rods are staggered.

[0011] As a further scheme of the present application: the heating barrel and the connecting ring plate are provided with an intermediate connecting ring, the upper and lower sides of the intermediate connecting ring are fixedly connected with a second threaded ring plate and a first threaded ring plate respectively, and the lower surface edge of the top cover disc is fixedly connected with a third threaded ring plate.

[0012] As a further scheme of the present application: the first threaded ring plate is threadedly connected with the top of the heating barrel, the second threaded ring plate is threadedly connected with the bottom of the connecting ring plate, and the third threaded ring plate is threadedly connected with the top of the connecting ring plate.

[0013] Compared with the prior art, the present application has the following advantages: by starting the driving motor in the heat insulation shell, the rotating vertical shaft is driven to rotate, thereby driving a plurality of groups of first stirring rods to rotate, and then under the cooperation of a plurality of groups of second stirring rods and a heating base, the evaporation of acrylonitrile is accelerated, at the same time, the air suction pump on the upper side of the liquefaction cylinder is started, the evaporated acrylonitrile is circulated in the liquefaction cylinder through the cooperation of the air suction pipe and the exhaust pipe, and the liquefied acrylonitrile enters the inside of the heat insulation collecting barrel through a plurality of groups of inner walls of the liquefaction cylinder and a plurality of groups of liquid guide rods, so that the evaporated acrylonitrile is circulated and liquefied while the acrylonitrile is efficiently evaporated, and the separation rate of acrylonitrile and acrylic acid is significantly improved.

[0014] Compared with the prior art, the beneficial effects of the utility model include: through the threaded connection of the first threaded ring plate and the heating barrel, the intermediate link ring is clamped with the heating barrel, then through the threaded connection of the second threaded ring plate and the connecting ring plate, the connecting ring plate is clamped with the intermediate link ring, and then through the threaded connection of the third threaded ring plate and the connecting ring plate, the top cover disc is clamped with the connecting ring plate, the step-by-step disassembly function of the separation distillation tower is realized, so as to carry out barrier-free maintenance on each part of the separation distillation tower, and the operation is simple. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the whole structure schematic view of the acrylic acid and acrylonitrile separation distillation tower in the utility model embodiment;

[0016] Figure 2 It is the connecting structure schematic view of the liquefaction cylinder in the utility model embodiment;

[0017] Figure 3 It is the section structure schematic view of the heating barrel in the utility model embodiment;

[0018] Figure 4 It is the connecting structure schematic view of the connecting ring plate and the heating barrel in the utility model embodiment.

[0019] In the drawing: 1, heating base; 2, heating barrel; 3, connecting ring plate; 4, intermediate link ring; 5, top cover disc; 6, liquefaction cylinder; 7, feed pipe; 8, first discharge pipe; 9, heat insulation collection barrel; 10, bearing rod; 11, second discharge pipe; 12, air extraction pump; 13, air extraction pipe; 14, exhaust pipe; 15, condensing pipe; 16, liquid inlet pipe; 17, liquid outlet pipe; 18, heat insulation machine shell; 19, driving motor; 20, rotating vertical shaft; 21, first stirring rod; 22, second stirring rod; 23, first threaded ring plate; 24, second threaded ring plate; 25, third threaded ring plate; 26, liquid guide rod. DETAILED DESCRIPTION

[0020] The specific embodiments of the utility model are further described below in combination with the drawings. It needs to be explained here that the description of these embodiments is used to help understanding the utility model, but does not constitute the limitation to the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] Embodiment 1, please refer to Figures 1-4The utility model relates to a kind of separation distillation column, including the heating bucket 2 of joint on the side of heating base 1, further including the connecting ring plate 3 located above heating bucket 2, the upper side of connecting ring plate 3 is provided with top cover disc 5, the upper surface of top cover disc 5 is jointed with liquefied cylinder 6 in middle position, the outer side of liquefied cylinder 6 is equipped with condenser pipe 15, the two ends of condenser pipe 15 are fixedly connected with liquid inlet pipe 16 and liquid outlet pipe 17 respectively, the top of liquefied cylinder 6 is fixedly installed with air pump 12, the inlet and outlet of air pump 12 are fixedly connected with air extraction pipe 13 and exhaust pipe 14 respectively, the inner side of connecting ring plate 3 is provided with heat insulation collection bucket 9, the bottom of heat insulation collection bucket 9 is fixedly connected with several groups of bearing rod 10, the outer bottom of heat insulation collection bucket 9 is fixedly connected with the second discharge pipe 11 of penetrating connecting ring plate 3, the inner bottom of heat insulation collection bucket 9 is fixedly connected with several groups of liquid guide rod 26, the outer top of heating bucket 2 is fixedly connected with feed pipe 7, the outer bottom of heating bucket 2 is fixedly connected with first discharge pipe 8, the bottom of heat insulation collection bucket 9 is jointed with heat insulation machine shell 18 in middle position, the inside of heat insulation machine shell 18 is clamped with driving motor 19, the output of driving motor 19 is fixedly connected with rotating vertical shaft 20, the outer side of rotating vertical shaft 20 is fixedly connected with several groups of first agitating rod 21, the inner side wall of heating bucket 2 is fixedly connected with several groups of second agitating rod 22.

[0022] The shape of condenser pipe 15 is spirally arranged, the shape of air extraction pipe 13 is U-shaped, and the lower ends of air extraction pipe 13 and exhaust pipe 14 are located inside liquefied cylinder 6.

[0023] In this embodiment, the cooperation of air extraction pipe 13 and exhaust pipe 14 is used to recycle the evaporated acrylonitrile.

[0024] Several groups of liquid guide rods 26 are distributed at equal intervals on the inner side of liquefied cylinder 6, and the lower ends of the several groups of liquid guide rods 26 are located inside heat insulation collection bucket 9.

[0025] In this embodiment, the several groups of liquid guide rods 26 are used to guide the liquefied acrylonitrile in liquefied cylinder 6 to the inside of heat insulation collection bucket 9.

[0026] Several groups of first agitating rods 21 are evenly distributed at equal intervals on the outer side of rotating vertical shaft 20, several groups of second agitating rods 22 are evenly distributed at equal intervals on the inner side wall of heating bucket 2, and the several groups of first agitating rods 21 and the several groups of second agitating rods 22 are staggered.

[0027] In this embodiment, the cooperation of the several groups of first agitating rods 21 and the several groups of second agitating rods 22 is used to accelerate the evaporation of acrylonitrile.

[0028] Specific, by starting the drive motor 19 inside the heat insulation shell 18, to drive rotating vertical shaft 20 rotation, thereby driving a number of groups of first stirring rod 21 together for rotation, and then in a number of groups of second stirring rod 22 and heating base 1 under the cooperation of the evaporation of propylene to accelerate the speed, while starting the liquefied cylinder 6 upper suction pump 12, through the cooperation of the suction pipe 13 and exhaust pipe 14 so that the evaporation of propylene in the liquefied cylinder 6 circulation, until the liquefied propylene by a number of groups of liquid cylinder 6 inner wall and a number of groups of liquid guide rod 26 into the heat insulation collection bucket 9 inside, can be in the efficient evaporation of propylene at the same time on the evaporation of propylene to carry out the circulation of liquefied, significantly improve the separation rate of propylene and propylene acid.

[0029] Embodiment 2, please see Figures 1-4 A kind of propylene acid and propylene separation distillation tower, heating bucket 2 and connecting ring plate 3 between being provided with intermediate link 4, the upper and lower sides of intermediate link 4 are respectively fixedly connected with second screw ring plate 24 and first screw ring plate 23, the lower surface edge position of top cover disc 5 is fixedly connected with third screw ring plate 25.

[0030] First screw ring plate 23 is screw connected with the top of heating bucket 2, second screw ring plate 24 is screw connected with the bottom of connecting ring plate 3, and third screw ring plate 25 is screw connected with the top of connecting ring plate 3.

[0031] In this embodiment, the first screw ring plate 23 and the second screw ring plate 24 on both sides of the connecting ring plate 3 are connected so that the connecting ring plate 3 is clamped on the upper side of the heating bucket 2.

[0032] Specifically, the first screw ring plate 23 is screw connected with the heating bucket 2 to clamp the intermediate link 4 with the heating bucket 2, and then the second screw ring plate 24 is screw connected with the connecting ring plate 3 to clamp the connecting ring plate 3 with the intermediate link 4, and then the third screw ring plate 25 is screw connected with the connecting ring plate 3 to clamp the top cover disc 5 with the connecting ring plate 3, realizing the step-by-step disassembly function of the separation distillation tower, so that each part of the separation distillation tower can be easily maintained.

[0033] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the described embodiments. For those skilled in the art, various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and still fall within the protection scope of the present application.

Claims

1. A distillation column for separating acrylic acid from acrylonitrile, comprising a heating bucket (2) which is hingedly connected to the upper side of a heating base (1), characterized in that: It also includes the connecting ring plate (3) located above the heating bucket (2), the upper side of the connecting ring plate (3) is provided with a top cover disc (5), the middle position of the upper surface of the top cover disc (5) is clamped with a liquefaction cylinder (6), the outer side of the liquefaction cylinder (6) is sleeved with a condenser pipe (15), the two ends of the condenser pipe (15) are respectively fixedly connected with a liquid inlet pipe (16) and a liquid outlet pipe (17), the top of the liquefaction cylinder (6) is fixedly installed with an air pump (12), the inlet and outlet of the air pump (12) are respectively fixedly connected with an air suction pipe (13) and an exhaust pipe (14); The inner side of the connecting ring plate (3) is provided with a heat insulation collection bucket (9), the bottom of the heat insulation collection bucket (9) is fixedly connected with a plurality of groups of bearing rods (10), the outer bottom of the heat insulation collection bucket (9) is fixedly connected with a second discharge pipe (11) penetrating through the connecting ring plate (3), the inner bottom of the heat insulation collection bucket (9) is fixedly connected with a plurality of groups of liquid guide rods (26), the outer top of the heating bucket (2) is fixedly connected with a feeding pipe (7), and the outer bottom of the heating bucket (2) is fixedly connected with a first discharge pipe (8). The middle position of the bottom of the heat insulation collection bucket (9) is clamped with a heat insulation machine shell (18), the inside of the heat insulation machine shell (18) is clamped with a driving motor (19), the output end of the driving motor (19) is fixedly connected with a rotating vertical shaft (20), the outer side of the rotating vertical shaft (20) is fixedly connected with a plurality of groups of first stirring rods (21), and the inner side wall of the heating bucket (2) is fixedly connected with a plurality of groups of second stirring rods (22).

2. The distillation column for separating acrylic acid and acrylonitrile according to claim 1, wherein: The shape of the condenser pipe (15) is spiral, the shape of the air suction pipe (13) is U-shaped, and the lower ends of the air suction pipe (13) and the exhaust pipe (14) are located in the inside of the liquefaction cylinder (6).

3. The distillation column for separating acrylic acid and acrylonitrile according to claim 2, wherein: A plurality of groups of the liquid guide rods (26) are distributed at equal intervals on the inside of the liquefaction cylinder (6), and the lower ends of the plurality of groups of liquid guide rods (26) are located in the inside of the heat insulation collection bucket (9).

4. The distillation column for separating acrylic acid and acrylonitrile according to claim 1, wherein: A plurality of groups of the first stirring rods (21) are evenly distributed at equal intervals on the outside of the rotating vertical shaft (20), a plurality of groups of the second stirring rods (22) are evenly distributed at equal intervals on the inner side wall of the heating bucket (2), and a plurality of groups of the first stirring rods (21) and a plurality of groups of the second stirring rods (22) are staggered.

5. The distillation column for separating acrylic acid and acrylonitrile according to claim 1, wherein: The intermediate connecting ring (4) is provided between the heating bucket (2) and the connecting ring plate (3), the upper and lower sides of the intermediate connecting ring (4) are respectively fixedly connected with a second threaded ring plate (24) and a first threaded ring plate (23), and the lower surface edge position of the top cover disc (5) is fixedly connected with a third threaded ring plate (25).

6. The distillation column for separating acrylic acid and acrylonitrile according to claim 5, wherein: The first threaded ring plate (23) is threadedly connected with the top of the heating bucket (2), the second threaded ring plate (24) is threadedly connected with the bottom of the connecting ring plate (3), and the third threaded ring plate (25) is threadedly connected with the top of the connecting ring plate (3).

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