Continuous reaction kettle for producing 2-acrylamido-2-methylpropanesulfonic acid

Abstract

The utility model discloses a continuous reaction kettle for producing 2-acrylamido-2-methylpropanesulfonic acid, which comprises a connecting kettle body, and the top and the bottom of the connecting kettle body are respectively and fixedly connected with an upper kettle body and a lower kettle body. According to the reaction kettle, the connection kettle body, the upper kettle body, the lower kettle body, the material passing valve, the heat exchange frame, the heat exchange plate, the heat exchange pipe, the cooling device, the steam inlet pipe and the steam outlet pipe are matched, so that the internal space of the reaction kettle can be divided into two independent spaces, namely the cold area and the hot area, and therefore, the reaction kettle can correspond to two different reactions; the internal temperature of the reaction kettle does not influence each other, so that the effect of prolonging the service life of the reaction kettle can be realized, and then through the cooperation of a speed reduction motor, a thermal insulation shaft, an upper rotating shaft, a lower rotating shaft and a spiral blade, a material mixed solution can be stirred and mixed, so that the service life of the reaction kettle can be prolonged, and the production benefit of the reaction kettle can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to 2 -acrylamido -2 -methylpropane sulfonic acid production technical field, specifically for a kind of production 2 -acrylamido -2 -methylpropane sulfonic acid with continuous reaction kettle. BACKGROUND

[0002] Synthesis 2-acrylamido-2-methylpropane sulfonic acid can be divided into one-step method and two-step method.One-step method is to react raw material acrylonitrile, isobutene, fuming sulfuric acid together at proper temperature, then separate out product 2-acrylamido-2-methylpropane sulfonic acid;Two-step method is to first sulfonate isobutene at low temperature with fuming sulfuric acid or SO3 in the presence of reaction solvent, get sulfonated intermediate, then react with acrylonitrile in the presence of sulfuric acid, and then separate out product 2-acrylamido-2-methylpropane sulfonic acid.Comparing two methods, one-step method has less investment, low cost, simple process and equipment, short reaction period, simple post-treatment process, high product yield and purity, and is the main method for preparing 2-acrylamido-2-methylpropane sulfonic acid at home and abroad.

[0003] After searching, Chinese patent application No. 201620089580.0 discloses a kind of production 2-acrylamido-2-methylpropane sulfonic acid with continuous reaction kettle, which includes reactor body, motor and speed reducer rack are arranged on the top of reactor body, motor is arranged on speed reducer rack, motor is connected with stirring shaft, upper stirring paddle, middle stirring paddle and lower stirring paddle are sequentially arranged on stirring shaft from top to bottom, the temperature control during reaction is relatively stable, product yield reaches 93%, crude product purity is relatively high and reaches 99.2%, and annual synthesis capacity is 6000 tons / year.

[0004] Although the above-mentioned patent has relatively stable temperature control during reaction, but in actual production, the patent needs to first cool the inside of the reactor body, then heat it, and the whole cooling and heating process is carried out in the inside of the reactor body, and frequent cooling and heating will have negative impact on the service life of the reactor body, that is, the frequent temperature change during use of the reactor body will cause thermal stress to the equipment, thereby accelerating its aging and affecting its production efficiency.

[0005] Therefore, a continuous reaction kettle for producing 2-acrylamido-2-methylpropane sulfonic acid is needed to solve the above problems. UTILITY MODEL CONTENT

[0006] In order to solve the problems in the background art, the utility model discloses a continuous reaction kettle for producing 2-acrylamido-2-methylpropanesulfonic acid, which has the advantages that the reaction kettle can be divided into cold and hot zones, thereby avoiding cold and hot reactions in the same reaction kettle cavity, prolonging the service life of the reaction kettle and improving its production efficiency.

[0007] In order to achieve the above object, the utility model provides the following technical scheme: a continuous reaction kettle for producing 2-acrylamido-2-methylpropanesulfonic acid, which comprises a connecting kettle body, the top and bottom of the connecting kettle body are fixedly connected with an upper kettle body and a lower kettle body respectively, the top of the upper kettle body is fixedly connected with a speed reducer, a rotating opening is formed in the center of the connecting kettle body, a heat insulation shaft is rotatably connected in the rotating opening, the top and bottom of the heat insulation shaft are fixedly connected with an upper rotating shaft and a lower rotating shaft respectively, the top of the upper rotating shaft is fixedly connected with the output end of the speed reducer, the surfaces of the upper rotating shaft and the lower rotating shaft are fixedly connected with spiral blades, a material valve is communicated in the connecting kettle body, the surfaces of the upper kettle body and the lower kettle body are fixedly connected with heat exchange frames symmetrically, the inner walls of the two heat exchange frames are fixedly connected with heat exchange plates respectively, and the two heat exchange plates are attached to the upper kettle body and the lower kettle body respectively, the heat exchange frames are fixedly connected with heat exchange pipes inside, the surfaces of the heat exchange pipes at the top are provided with cooling devices, and the input end and the output end of the heat exchange pipes at the bottom are symmetrically communicated with steam inlet pipes and steam outlet pipes.

[0008] As preferred in the utility model, heat insulation cavities are symmetrically formed in the inner walls of the connecting kettle body, and heat insulation plates are fixedly connected inside the heat insulation cavities.

[0009] As preferred in the utility model, a material adding opening is formed in one side of the connecting kettle body, a material adding pipe is fixedly connected inside the material adding opening, and the bottom of the material adding pipe is communicated with the lower kettle body.

[0010] As preferred in the utility model, the surfaces of the upper rotating shaft and the lower rotating shaft are fixedly connected with a large stirring blade group and a small stirring blade group symmetrically about the spiral blades.

[0011] As preferred in the utility model, heat preservation plates are fixedly connected outside the heat exchange frames, and the heat preservation plates are located outside the heat exchange pipes.

[0012] As preferred in the utility model, a support frame is fixedly connected to the bottom of the lower kettle body, and a brake block is threadedly connected to the bottom of the support frame.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The utility model discloses a cooperation of connecting cauldron body, upper cauldron body, lower cauldron body, material valve, heat exchange frame, heat exchange plate, heat exchange tube, cooling device, steam inlet pipe and steam exhaust pipe can make the internal space of reaction kettle divide into two independent spaces, and two independent spaces are cold area and hot area, thereby can correspond two different reactions, make the temperature of its inside not influence each other, and then can realize the effect of prolonging the service life of reaction kettle, then through the cooperation of speed reducer, temperature insulation shaft, upper rotating shaft, lower rotating shaft and helical blade, material mixed solution can be stirred and mixed, thereby can prolong the service life of reaction kettle and improve its production efficiency.

[0015] 2. The utility model discloses through the setting of temperature insulation cavity and temperature insulation board, can divide the temperature insulation area of connecting cauldron body into two parts, make connecting cauldron body can make the transition of cold and hot temperature conduction, can further prolong the service life of connecting cauldron body. ACCOUT OF DRAWINGS

[0016] Figure 1 It is structure schematic diagram of the utility model;

[0017] Figure 2 It is three -dimensional schematic diagram of heat exchange frame, heat exchange plate and heat exchange pipe cooperation of the utility model;

[0018] Figure 3 It is partial section three -dimensional schematic diagram of structure of the utility model;

[0019] Figure 4 It is three -dimensional schematic diagram of temperature insulation shaft, upper rotating shaft and lower rotating shaft cooperation of the utility model.

[0020] In the drawing: 1, connecting cauldron body;2, upper cauldron body;3, lower cauldron body;4, speed reducer;5, temperature insulation shaft;6, upper rotating shaft;7, lower rotating shaft;8, helical blade;9, material valve;10, heat exchange frame;11, heat exchange plate;12, heat exchange tube;13, cooling device;14, steam inlet pipe;15, steam exhaust pipe;16, temperature insulation cavity;17, temperature insulation board;18, material adding port;19, material adding pipe;20, big stirring blade group;21, small stirring blade group;22, heat preservation board. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the scope of the utility model protection.

[0022] For example, Figure 1As shown in the figure, the utility model provides a kind of continuous reaction kettle for producing 2-acrylamido-2-methylpropane sulfonic acid, including connecting kettle body 1, the top and bottom of connecting kettle body 1 are respectively fixedly connected with upper kettle body 2 and lower kettle body 3, the top of upper kettle body 2 is respectively communicated with feed pipe and auxiliary material pipe, the bottom of lower kettle body 3 is communicated with discharge pipe, the top of upper kettle body 2 is fixedly connected with speed reducer motor 4, the center of connecting kettle body 1 is provided with rotating mouth, rotating mouth is rotatably connected with heat insulation shaft 5 in the inside, the top and bottom of heat insulation shaft 5 are respectively fixedly connected with upper rotating shaft 6 and lower rotating shaft 7, and the top of upper rotating shaft 6 is fixedly connected with the output end of speed reducer motor 4, the surface of upper rotating shaft 6 and lower rotating shaft 7 is all fixedly connected with helical blade 8, connecting kettle body 1 is communicated with material valve 9 in the inside, the surface of upper kettle body 2 and lower kettle body 3 is fixedly connected with heat exchange frame 10 symmetrically, the inner wall of two heat exchange frames 10 is all fixedly connected with heat exchange plate 11, and two heat exchange plates 11 are respectively pasted with upper kettle body 2 and lower kettle body 3, heat exchange frame 10 is fixedly connected with heat exchange pipe 12 in the inside, the surface of upper heat exchange pipe 12 is provided with cooling device 13, the inside of upper heat exchange pipe 12 is filled with refrigerant, the input end and output end of lower heat exchange pipe 12 are symmetrically communicated with steam inlet pipe 14 and steam exhaust pipe 15, the inner wall of upper kettle body 2 and lower kettle body 3 is respectively fixedly connected with temperature detector (not shown), cooling device 13 is existing mature technology product, cooling device 13 is compressed into high temperature and high pressure state by compressor with gaseous refrigerant, then is cooled by condenser, makes it change into liquid state, liquid refrigerant is entered evaporator after pressure reduction by throttling valve, absorbs heat and evaporates in evaporator, so that the water around evaporator is cooled, and the water is circulated in specific components after cooling, and takes away heat, realizes cooling effect.

[0023] Reference Figure 3 The inner wall of connecting kettle body 1 is symmetrically provided with heat insulation cavity 16, and heat insulation plate 17 is fixedly connected in the inside of heat insulation cavity 16.

[0024] As a technical optimization scheme of the utility model, the heat insulation area of connecting kettle body 1 can be divided into two parts by the arrangement of heat insulation cavity 16 and heat insulation plate 17, so that the connecting kettle body 1 can transition the conduction of cold and hot temperature, thereby prolonging the service life of the connecting kettle body 1.

[0025] Reference Figure 3 One side of connecting kettle body 1 is provided with material adding port 18, and material adding pipe 19 is fixedly connected in the inside of material adding port 18, and the bottom of material adding pipe 19 is communicated with lower kettle body 3.

[0026] As a technical optimization scheme of the utility model, the arrangement of material adding port 18 and material adding pipe 19 can add isobutene and acetic acid auxiliary materials to lower kettle body 3, thereby facilitating the production of 2-acrylamido-2-methylpropane sulfonic acid.

[0027] ReferenceFigure 3 And Figure 4 The surface of the upper rotating shaft 6 and the lower rotating shaft 7 is fixedly connected with a large stirring blade group 20 and a small stirring blade group 21 in a symmetrical manner with respect to the spiral blade 8.

[0028] As a technical optimization scheme of the utility model, through the setting of the large stirring blade group 20 and the small stirring blade group 21, the stirring effect of the upper rotating shaft 6 and the lower rotating shaft 7 can be improved, thereby the production efficiency of 2-acrylamido-2-methylpropanesulfonic acid can be improved.

[0029] Reference Figure 1 And Figure 3 The outer side of the heat exchange frame 10 is fixedly connected with a heat preservation plate 22, and the heat preservation plate 22 is located at the outer side of the heat exchange pipe 12.

[0030] As a technical optimization scheme of the utility model, through the setting of the heat preservation plate 22, the heat loss of the surface of the heat exchange pipe 12 can be reduced, thereby the energy-saving effect can be achieved to a certain extent.

[0031] Reference Figure 1 And Figure 2 The bottom of the lower kettle body 3 is fixedly connected with a supporting frame, and the bottom of the supporting frame is threadedly connected with a brake block.

[0032] As a technical optimization scheme of the utility model, through the setting of the supporting frame and the brake block, the brake block can be rotated according to the use requirement, thereby the height of the supporting frame can be adjusted to a certain extent, and then the position of the reaction kettle can be conveniently adjusted, and the inclination of the reaction kettle can be avoided.

[0033] The working principle and use process of the utility model: when using the continuous reaction kettle to produce 2-acrylamide-2-methylpropanesulfonic acid, first, add a specified amount of acrylonitrile as a pre-reaction liquid through the feeding pipe, then start the speed reducer 4 to drive the upper rotating shaft 6 to rotate slowly, at this time, the cooling device 13 needs to be started to cool the refrigerant in the upper heat exchange pipe 12 to a specified temperature, so that it uses the heat exchange plate 11 to absorb heat from the upper kettle body 2, so that the temperature of the acrylonitrile inside the upper kettle body 2 is in a low temperature state, then add oleum and isobutene through the auxiliary material pipe, and mix them under the action of the spiral blade 8, the large stirring blade group 20 and the small stirring blade group 21, after the reaction stays for a specified time, the mixture is discharged into the lower kettle body 3 through the feeding valve 9, then it is placed for a specified time, at this time, steam can be introduced through the steam inlet pipe 14 and the steam outlet pipe 15, so that the internal temperature of the lower kettle body 3 can be raised to a specified temperature, at this time, the required auxiliary material can be added through the material adding pipe 19, then the lower rotating shaft 7, the spiral blade 8, the large stirring blade group 20 and the small stirring blade group 21 are stirred, so that the reaction effect can be improved, so that the continuous reaction kettle can divide the reaction area into cold and hot zones, so that the cold and hot reactions can be carried out in one reaction kettle cavity, so that the service life of the reaction kettle can be prolonged and the production efficiency can be improved.

[0034] It should be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0035] While embodiments of the present application have been shown and described with reference to a few embodiments, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the application which is defined by the appended claims and their equivalents.

Claims

1. A continuous reactor for producing 2-acrylamido-2-methylpropane sulfonic acid comprising a connecting vessel (1), characterized in that: The top and bottom of the connecting kettle body (1) are fixedly connected with an upper kettle body (2) and a lower kettle body (3), respectively, the top of the upper kettle body (2) is fixedly connected with a speed reducer motor (4), the center of the connecting kettle body (1) is provided with a rotating opening, the rotating opening is rotatably connected with a temperature insulation shaft (5), the top and bottom of the temperature insulation shaft (5) are fixedly connected with an upper rotating shaft (6) and a lower rotating shaft (7), respectively, and the top of the upper rotating shaft (6) is fixedly connected with the output end of the speed reducer motor (4), the surfaces of the upper rotating shaft (6) and the lower rotating shaft (7) are fixedly connected with spiral blades (8), the inside of the connecting kettle body (1) is communicated with a material valve (9), the surfaces of the upper kettle body (2) and the lower kettle body (3) are fixedly connected with heat exchange frames (10) in a symmetrical manner, the inner walls of the two heat exchange frames (10) are fixedly connected with heat exchange plates (11), respectively, and the two heat exchange plates (11) are attached to the upper kettle body (2) and the lower kettle body (3), respectively, the inside of the heat exchange frame (10) is fixedly connected with a heat exchange pipe (12), the surface of the upper heat exchange pipe (12) is provided with a cooling device (13), and the input end and the output end of the lower heat exchange pipe (12) are symmetrically communicated with a steam inlet pipe (14) and a steam outlet pipe (15).

2. A continuous reactor for producing 2-acrylamido-2-methylpropanesulfonic acid according to claim 1, characterized in that: The inner wall of the connecting kettle body (1) is symmetrically provided with a temperature insulation cavity (16), and the temperature insulation cavity (16) is fixedly connected with a temperature insulation plate (17) inside.

3. A continuous reactor for producing 2-acrylamido-2-methylpropanesulfonic acid according to claim 1, characterized in that: One side of the connecting kettle body (1) is provided with a material adding opening (18), the inside of the material adding opening (18) is fixedly connected with a material adding pipe (19), and the bottom of the material adding pipe (19) is communicated with the lower kettle body (3).

4. A continuous reactor for producing 2-acrylamido-2-methylpropanesulfonic acid according to claim 1, characterized in that: The surfaces of the upper rotating shaft (6) and the lower rotating shaft (7) are fixedly connected with a large stirring blade group (20) and a small stirring blade group (21) in a symmetrical manner about the spiral blades (8).

5. A continuous reactor for producing 2-acrylamido-2-methylpropanesulfonic acid according to claim 1, characterized in that: The outside of the heat exchange frame (10) is fixedly connected with a heat preservation plate (22), and the heat preservation plate (22) is located outside the heat exchange pipe (12).

6. A continuous reactor for producing 2-acrylamido-2-methylpropanesulfonic acid according to claim 1, characterized in that: The bottom of the lower kettle body (3) is fixedly connected with a support frame, and the bottom of the support frame is threadedly connected with a brake block.

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