Esterification device in propyl acetate synthesis process

Abstract

The utility model discloses an esterification device in a propyl acetate synthesis process, which belongs to the technical field of esterification devices and comprises a reaction tank, a feed pipe and an exhaust pipe are respectively arranged at the edge of the top end of the reaction tank, a plurality of annular electric heating rods are embedded in the inner wall layer of the reaction tank, and a double-shaft motor is fixedly connected to the center of the top end of the reaction tank. An output shaft at the bottom end of the double-shaft motor extends into the reaction tank; when the esterification device is used, raw materials including propyl alcohol and acetic acid can be added into the reaction tank through the feeding pipe, required catalysts are loaded in the catalyst hopper, then, the spline shaft drives the spline housing to synchronously drive the stirring rods to rotate by starting the double-shaft motor and the electric heating rods, and in addition, the stirring rods are driven by the spline shaft to rotate. The transmission roller rotates, and the lifting ring drives the lifting rod and a connecting plate fixed to the bottom end of the lifting plate to do reciprocating lifting motion and drives the spline housing in the rotating process to do reciprocating lifting motion in combination with the effects of an inclined ring groove and a guide ball.

Description

Technical Field

[0001] The utility model belongs to the technical field of esterification devices, and particularly relates to an esterification device in the synthesis process of propyl acetate. Background Art

[0002] The esterification unit is a key piece of equipment in the propyl acetate synthesis process, used to esterify propanol and acetic acid in the presence of a catalyst to produce propyl acetate. The esterification unit typically consists of the following main components: a reactor for adding propanol and acetic acid to the reactor for reaction; a dosing system for precisely controlling the addition of propanol and acetic acid; a catalyst feeder for catalyzing the esterification reaction between propanol and acetic acid; and a separation unit for separating the propyl acetate from the unreacted propanol and acetic acid in the reaction product. The esterification unit efficiently converts propanol and acetic acid into propyl acetate, providing a reliable process for propyl acetate production.

[0003] The esterification device in the prior art propyl acetate synthesis process has the following disadvantages during use: a stirring structure is generally used to stir and heat the propanol and acetic acid added to the reaction device, and a catalyst is added to separate the propyl acetate from the unreacted propanol and acetic acid. However, during actual use, the stirring structure can only perform rotational stirring and cannot be reciprocated during the rotational stirring process, resulting in low efficiency of the mixing reaction. Secondly, the catalyst is generally poured into the reaction device in large quantities at one time, resulting in a large load during the stirring and mixing reaction and easily resulting in poor mixing effect. Therefore, an esterification device in the propyl acetate synthesis process is needed. Utility Model Content

[0004] The purpose of the utility model is to provide an esterification device in the synthesis process of propyl acetate to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: an esterification device in a propyl acetate synthesis process, comprising a reaction tank, a feed pipe and an exhaust pipe respectively provided at the top edge of the reaction tank, a plurality of annular electric heating rods embedded in the inner wall layer of the reaction tank, a dual-axis motor fixedly connected to the center of the top of the reaction tank, an output shaft at the bottom end of the dual-axis motor extending into the reaction tank and fixedly connected to a spline shaft, a spline sleeve provided on the outer movable sleeve of the spline shaft, a plurality of stirring rods fixedly connected to the outer side of the spline sleeve, and a catalyst hopper fixedly connected to the top opening of the reaction tank is further provided on the right side of the dual-axis motor;

[0006] It also includes a reciprocating lifting transmission structure and an intermittent opening and closing structure. The reciprocating lifting transmission structure is installed on the top output shaft of the dual-axis motor and is connected to the reaction tank and the spline sleeve. The reciprocating lifting transmission structure can simultaneously drive the spline shaft to drive the spline sleeve to rotate while the dual-axis motor drives the spline shaft to drive the spline sleeve to rotate, and can also link the spline sleeve to drive multiple stirring rods to reciprocate up and down.

[0007] The intermittent opening and closing structure is installed on the catalyst hopper and is connected to the reciprocating lifting transmission structure. The intermittent opening and closing structure can intermittently put the catalyst in the catalyst hopper into the reaction tank under the linkage action of the reciprocating lifting transmission structure.

[0008] As a preferred embodiment, a discharge pipe is fixed at the discharge port at the bottom end of the reaction tank, and a solenoid valve is installed on the discharge pipe.

[0009] As a preferred embodiment, the reciprocating lifting transmission structure includes a transmission roller fixed to the top output shaft of the dual-axis motor, an oblique annular groove is opened on the outer side of the transmission roller, a guide ball is movably overlapped in the oblique annular groove, the guide ball is fixed to the inner wall of the lifting ring through a connecting column, and the lifting ring is movably sleeved on the outer side of the transmission roller.

[0010] As a preferred embodiment, the left side and right side of the bottom end of the lifting ring are respectively fixed with a lifting rod and a lifting plate, the bottom ends of the lifting rod and the lifting plate are movable through the reaction tank and are fixed with the same connecting plate, and the spline sleeve is rotatably connected to the connecting plate through a bearing.

[0011] As a preferred embodiment, the intermittent opening and closing structure includes two symmetrically arranged L-shaped baffles movably inserted on the catalyst hopper, and the opposite ends of the two L-shaped baffles are in contact with each other.

[0012] As a preferred embodiment, guide rods are fixed to the side walls of the two L-shaped baffles facing the lifting plate, and the two guide rods are movably connected to the guide channels provided on the lifting plate. The two guide channels are symmetrically arranged, and the vertical cross-sections of the guide channels are both "hockey stick" shaped structures.

[0013] Compared with the prior art, the esterification device in the propyl acetate synthesis process provided by the present invention has at least the following beneficial effects:

[0014] In the utility model, when using the esterification device, the raw materials propanol and acetic acid can be added to the reaction tank through the feed pipe, and the required catalyst is loaded in the catalyst hopper. Secondly, by starting the dual-axis motor and turning on multiple electric heating rods, the spline shaft drives the spline sleeve to synchronously drive the multiple stirring rods to rotate. In addition, the transmission roller rotates, and combined with the effects of the oblique ring groove and the guide ball, the lifting ring drives the lifting rod and the connecting plate fixed at the bottom end of the lifting plate to perform reciprocating lifting and lowering motions, and drives the spline sleeve to perform reciprocating lifting and lowering actions during the rotation process, thereby realizing a reciprocating lifting and lowering stirring action, greatly improving the reaction efficiency of the heated catalysis of propanol and acetic acid. Furthermore, during the reciprocating lifting and lowering process of the lifting plate, the effects of the two guide channels and the two guide rods are coordinated to enable the two L-shaped baffles to be intermittently opened and closed, so that the catalyst in the catalyst hopper can intermittently and quantitatively enter the reaction tank, avoiding the burden caused by the one-time input of the catalyst during the esterification reaction, thereby achieving a better effect of the esterification reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Fig. 1 This is a schematic diagram of the overall three-dimensional structure of the utility model;

[0016] Fig. 2 This is a schematic diagram of the three-dimensional structure of each component of the reaction tank of the utility model after being cut open;

[0017] Fig. 3 It is a three-dimensional structural diagram of each component in the reciprocating lifting transmission structure and each component in the intermittent opening and closing structure of the utility model.

[0018] In the figure: 1. reaction tank; 11. electric heating rod; 2. feed pipe; 3. exhaust pipe; 4. catalyst hopper; 5. dual-axis motor; 51. spline shaft; 52. spline sleeve; 53. stirring rod; 6. discharge pipe; 7. reciprocating lifting transmission structure; 71. connecting plate; 72. lifting rod; 73. lifting plate; 74. lifting ring; 75. connecting column; 76. guide ball; 77. transmission roller; 78. oblique ring groove; 8. intermittent opening and closing structure; 81. L-shaped baffle; 82. guide rod; 83. guide channel. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the embodiments.

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The following examples are used to illustrate the present application, but cannot be used to limit the protection scope of the present application. The conditions in the examples can be further adjusted according to specific conditions, and simple improvements of the method of the present application under the concept of the present application all belong to the protection scope of the present application.

[0022] Embodiment

[0023] The esterification device in the synthesis process of propyl acetate in the prior art has the following disadvantages in use: generally, a stirring structure is used to stir and heat propyl alcohol and acetic acid added into the reaction device, and the catalyst is added to realize the separation of propyl acetate from unreacted propyl alcohol and acetic acid, but the stirring structure can only rotate and stir in actual use, and cannot reciprocatingly lift during rotation and stirring, resulting in low efficiency of the mixing reaction, and secondly, the catalyst is generally poured into the reaction device in large quantities at one time, resulting in large load during stirring and mixing reaction, and the problem of poor mixing effect is prone to occur;

[0024] Therefore, with reference to Figs. 1-3 The present application provides an esterification device in the synthesis process of propyl acetate, comprising: a reaction tank 1, a feed pipe 2 and an exhaust pipe 3 are respectively arranged at the top edge of the reaction tank 1, a plurality of annular electric heating rods 11 are embedded in the inner wall of the reaction tank 1, a double-shaft motor 5 is fixedly connected to the center of the top end of the reaction tank 1, the bottom end output shaft of the double-shaft motor 5 extends into the reaction tank 1 and is fixedly connected with a spline shaft 51, a spline sleeve 52 is movably sleeved outside the spline shaft 51, a plurality of stirring rods 53 are fixedly connected to the outside of the spline sleeve 52, and a catalyst hopper 4 fixedly connected to the top opening of the reaction tank 1 is further arranged on the right side of the double-shaft motor 5.

[0025] Further comprising a reciprocating lifting transmission structure 7 and an intermittent opening and closing structure 8, the reciprocating lifting transmission structure 7 is installed on the top end output shaft of the double-shaft motor 5 and connected with the reaction tank 1 and the spline sleeve 52, and the reciprocating lifting transmission structure 7 can drive the spline sleeve 52 to rotate while driving the plurality of stirring rods 53 to reciprocatingly move up and down under the driving of the double-shaft motor 5.

[0026] The intermittent opening and closing structure 8 is installed on the catalyst hopper 4 and connected with the reciprocating lifting transmission structure 7, and the intermittent opening and closing structure 8 can intermittently put the catalyst in the catalyst hopper 4 into the reaction tank 1 under the linkage of the reciprocating lifting transmission structure 7.

[0027] The opening of the plurality of electric heating rods 11 can heat the materials in the reaction tank 1, and the arrangement of the exhaust pipe 3 can facilitate the exhaust of the steam generated during the reaction.

[0028] Further, asFig. 2 As shown, it is worth mentioning that a discharge pipe 6 is fixed at the discharge port at the bottom end of the reaction tank 1, and a solenoid valve is installed on the discharge pipe 6.

[0029] When the material in the reaction tank 1 needs to be discharged, the discharge can be achieved by starting the solenoid valve.

[0030] Further as Figs. 1-3 As shown, it is worth mentioning that in order to enable the dual-axis motor 5 to drive the spline shaft 51 to drive the spline sleeve 52 to rotate and realize the reciprocating lifting motion of the spline sleeve 52, a reciprocating lifting transmission structure 7 is provided, including a transmission roller 77 fixed to the top output shaft of the dual-axis motor 5, and an oblique annular groove 78 is provided on the outer side of the transmission roller 77. A guide ball 76 is movably overlapped in the oblique annular groove 78, and the guide ball 76 is fixed to the inner wall of the lifting ring 74 through the connecting column 75. The lifting ring 74 is movably sleeved on the outer side of the transmission roller 77. The left side and the right side of the bottom end of the lifting ring 74 are respectively fixed with a lifting rod 72 and a lifting plate 73. The bottom ends of the lifting rod 72 and the lifting plate 73 are both movably penetrated into the reaction tank 1 and are fixed with the same connecting plate 71. The spline sleeve 52 is rotatably connected to the connecting plate 71 through a bearing.

[0031] The oblique annular groove 78 on the transmission roller 77 can be driven to move up and down by the guide ball 76 due to its shape design when the transmission roller 77 rotates.

[0032] Further as Figs. 1-3 As shown, it is worth mentioning that in order to enable the catalyst in the catalyst hopper 4 to intermittently enter the reaction tank 1, an intermittent opening and closing structure 8 is provided, including two symmetrically arranged L-shaped baffles 81 movably inserted on the catalyst hopper 4, and the opposite ends of the two L-shaped baffles 81 are fitted together. A guide rod 82 is fixed to the side wall of the two L-shaped baffles 81 facing the lifting plate 73, and the two guide rods 82 are respectively movably overlapped in the guide channels 83 provided on the lifting plate 73. The two guide channels 83 are symmetrically arranged, and the vertical sections of the guide channels 83 are both "hockey stick" shaped structures.

[0033] The diameter of the guide rod 82 is equal to the width of the guide channel 83. Due to the lifting and lowering of the shape of the guide channel 83, when the lifting plate 73 moves down to a certain position, the two guide rods 82 can move away from each other, and the two L-shaped baffles 81 can move away from each other, thereby creating a gap between the two L-shaped baffles 81, thereby facilitating the catalyst in the catalyst hopper 4 to enter the reaction tank 1.

[0034] In summary: in the use of the esterification device, the raw materials propanol and acetic acid can be added to the reaction tank 1 through the feed pipe 2, and the required catalyst can be loaded into the catalyst hopper 4. Secondly, by starting the dual-axis motor 5 and turning on the multiple electric heating rods 11, the spline shaft 51 drives the spline sleeve 52 to synchronously drive the multiple stirring rods 53 to rotate. In addition, the transmission roller 77 rotates, and combined with the effect of the oblique annular groove 78 and the guide ball 76, the lifting ring 74 drives the lifting rod 72 and the connecting plate 71 fixed at the bottom end of the lifting plate 73 to perform reciprocating lifting and lowering motions, and with During the dynamic rotation, the spline sleeve 52 performs a reciprocating lifting and lowering motion, thereby realizing a reciprocating lifting and lowering stirring motion, which greatly improves the reaction efficiency of the heated catalytic reaction of propanol and acetic acid. Furthermore, during the reciprocating lifting and lowering process of the lifting plate 73, the two guide channels 83 and the two guide rods 82 cooperate to enable the two L-shaped baffles 81 to be intermittently opened and closed, so that the catalyst in the catalyst hopper 4 can be intermittently and quantitatively entered into the reaction tank 1, avoiding the burden caused by the one-time input of the catalyst during the esterification reaction, thereby achieving a better effect of the esterification reaction.

[0035] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by persons having ordinary skills in the field to which this utility model belongs. The words "including" or "comprising" and the like used in this utility model mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The words "connect" or "connected" and the like are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. The words "upper", "lower", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0036] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An esterification device in a propyl acetate synthesis process, comprising a reaction tank (1), a feed pipe (2) and an exhaust pipe (3) respectively provided at the top edge of the reaction tank (1), and a plurality of annular electric heating rods (11) embedded in the inner wall layer of the reaction tank (1), characterized in that: A double-shaft motor (5) is fixedly connected to the center of the top end of the reaction tank (1); an output shaft at the bottom end of the double-shaft motor (5) extends into the reaction tank (1) and is fixedly connected to a spline shaft (51); a spline sleeve (52) is provided on the outer movable sleeve of the spline shaft (51); a plurality of stirring rods (53) are fixedly connected to the outer side of the spline sleeve (52); and a catalyst hopper (4) is also provided on the right side of the double-shaft motor (5) and is fixedly connected to the top opening of the reaction tank (1); The invention also includes a reciprocating lifting transmission structure (7) and an intermittent opening and closing structure (8). The reciprocating lifting transmission structure (7) is installed on the top output shaft of the double-axis motor (5) and is connected to the reaction tank (1) and the spline sleeve (52). The reciprocating lifting transmission structure (7) can simultaneously drive the spline shaft (51) of the double-axis motor (5) to drive the spline sleeve (52) to rotate, and can also link the spline sleeve (52) to drive the multiple stirring rods (53) to reciprocate up and down. The intermittent opening and closing structure (8) is installed on the catalyst hopper (4) and is connected to the reciprocating lifting transmission structure (7). The intermittent opening and closing structure (8) can intermittently feed the catalyst in the catalyst hopper (4) into the reaction tank (1) under the linkage action of the reciprocating lifting transmission structure (7).

2. The esterification device in the propyl acetate synthesis process according to claim 1, characterized in that: A discharge pipe (6) is fixed at the discharge port at the bottom end of the reaction tank (1), and a solenoid valve is installed on the discharge pipe (6).

3. The esterification device in the propyl acetate synthesis process according to claim 1, characterized in that: The reciprocating lifting transmission structure (7) includes a transmission roller (77) fixed to the top output shaft of the dual-axis motor (5), an oblique annular groove (78) is provided on the outer side of the transmission roller (77), a guide ball (76) is movably overlapped in the oblique annular groove (78), and the guide ball (76) is fixed to the inner wall of the lifting ring (74) through a connecting column (75), and the lifting ring (74) is movably sleeved on the outer side of the transmission roller (77).

4. The esterification device in the propyl acetate synthesis process according to claim 3, characterized in that: The left side and right side of the bottom end of the lifting ring (74) are fixedly connected to a lifting rod (72) and a lifting plate (73), respectively. The bottom ends of the lifting rod (72) and the lifting plate (73) are movable and penetrate into the reaction tank (1) and are fixedly connected to the same connecting plate (71). The spline sleeve (52) is rotatably connected to the connecting plate (71) through a bearing.

5. The esterification device in the propyl acetate synthesis process according to claim 4, characterized in that: The intermittent opening and closing structure (8) comprises two symmetrically arranged L-shaped baffles (81) movably inserted on the catalyst hopper (4), and the opposite ends of the two L-shaped baffles (81) are in contact with each other.

6. The esterification device in the propyl acetate synthesis process according to claim 5, characterized in that: A guide rod (82) is fixedly connected to one side wall of the two L-shaped baffles (81) facing the lifting plate (73). The two guide rods (82) are movably connected to the guide channels (83) provided on the lifting plate (73). The two guide channels (83) are symmetrically arranged, and the vertical cross-sections of the guide channels (83) are both "hockey stick" shaped structures.

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