Flash tank for improving quality of continuous chloroacetic acid product

Abstract

The application provides a flash tank for improving the quality of chloroacetic acid products in a continuous method, and relates to the technical field of flash tanks.The flash tank for improving the quality of chloroacetic acid products in a continuous method comprises a low-pressure tank, which is a hollow structure with openings at the upper end and the lower end; a liquid inlet pipe, which is installed on the low-pressure tank; and a centrifugal injection assembly, which comprises a centrifugal rotating seat rotatably installed at the liquid outlet end of the liquid inlet pipe, and a plurality of nozzle cavities are formed in the circumferential wall of the centrifugal rotating seat in the circumferential direction of the centrifugal rotating seat.The flash tank has the beneficial effects that: the high-pressure saturated mother liquor enters the centrifugal rotating seat to drive the centrifugal rotating seat to rotate, the high-pressure saturated mother liquor is sprayed out in the rotating state of the centrifugal rotating seat, and the liquid drops can impact on the rotating crushing frame to be crushed, which can not only crush and refine the saturated mother liquor, but also make the saturated mother liquor contact with air more fully to improve the efficiency of flash evaporation, and can also avoid the direct impact of the saturated mother liquor on the inner wall of the low-pressure tank, so that the erosion of the internal components of the low-pressure tank can be effectively prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flash tank, in particular to a flash tank for improving the product quality of chloroacetic acid by continuous method. BACKGROUND

[0002] Flash is that the saturated water under high pressure enters the container under lower pressure, and the saturated water becomes saturated water vapor and saturated water under the pressure of the container due to the sudden decrease of pressure.

[0003] Chloroacetic acid is an important organic chemical raw material, which is mainly used to produce carboxymethyl cellulose, glycine, chloroacetic acid ethyl ester and the like. At present, the main method for industrial production of chloroacetic acid is acetic acid catalytic chlorination method, which can be specifically divided into continuous method and batch method. Compared with the batch method, the continuous method has the advantages of small device size, large production capacity, advanced production technology, high product quality, less pollution and corrosion, etc.

[0004] In the preparation process of chloroacetic acid, a flash tank is needed to flash the intermediate material, so as to separate the required product. However, during the use of the flash tank, cavitation may occur due to the vaporization of the supersaturated liquid, and erosion may occur when the liquid washes the tank structure for a long time, which has a great influence on the service life of the tank structure. When the tank body is damaged, the maintenance and replacement of the tank body require high cost. SUMMARY

[0005] The purpose of the present application is to provide a flash tank for improving the product quality of chloroacetic acid by continuous method, which aims to solve the problem that the flash tank in the prior art may cause cavitation due to the vaporization of the supersaturated liquid during use, and erosion may occur when the liquid washes the tank structure for a long time, which has a great influence on the service life of the tank structure.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: the flash tank for improving the product quality of chloroacetic acid by continuous method comprises:

[0007] The low-pressure tank is a hollow structure with openings at the top and bottom ends.

[0008] The liquid inlet pipe is installed on the low-pressure tank and used to supply saturated mother liquor into the low-pressure tank (10).

[0009] The centrifugal injection assembly comprises a centrifugal rotating seat rotatably installed at the liquid outlet end of the liquid inlet pipe, and a plurality of nozzle cavities are formed in the circumferential wall of the centrifugal rotating seat along the circumferential direction, the nozzle cavities are communicated with the liquid inlet pipe, and the cross section of the nozzle cavities is in the form of arc, so that the high-pressure saturated mother liquor entering the nozzle cavities can drive the nozzle cavities to rotate, and the nozzle cavities can spray the saturated mother liquor away in the rotating state.

[0010] The breaking assembly comprises a breaking frame rotatably installed in the low-pressure tank, and breaking strips are arranged on the breaking frame, and the saturated mother liquor drops sprayed from the nozzle cavity impact on the rotating breaking strips to further pulverize and refine the saturated mother liquor drops.

[0011] Further, the diameter of the liquid inlet of the nozzle cavity is smaller than the diameter of the liquid outlet, and the high-pressure saturated mother liquor is sprayed in the gradually expanding space of the nozzle cavity.

[0012] Further, the breaking frame is in an inverted conical structure with an upper opening and a lower opening, a fixed ring is fixedly installed on the upper surface of the breaking frame, and the breaking frame is rotatably installed on the inner wall of the low-pressure tank through the fixed ring.

[0013] Further, the centrifugal spraying assembly is located inside the breaking frame, and the rotating directions of the breaking frame and the centrifugal spraying assembly are opposite.

[0014] Further, the application further comprises a defoaming mechanism for processing the foam generated in the saturated steam body floating upwards after the saturated mother liquor is flashed.

[0015] Further, the defoaming mechanism comprises an impeller rotatably installed in the liquid inlet pipe, a rotating shaft connected with the impeller is rotatably installed on the liquid inlet pipe, a rotating frame is fixedly installed on the upper end of the rotating shaft, and a plurality of cleaning plates are uniformly arranged on the inner side of the rotating frame along the circumferential direction of the rotating frame, when the saturated mother liquor flows in the liquid inlet pipe, the rotating frame and the cleaning plates are driven to rotate by the impeller, and the foam generated in the passing saturated steam is defoamed.

[0016] Further, the defoaming mechanism further comprises a defoamer, and the defoamer is installed above the rotating frame, wherein the defoamer is composed of a plurality of splicing plates, the plurality of splicing plates form a continuous curved structure in the vertical direction, the plurality of curved structures are arranged horizontally and spaced apart, and a plurality of continuous curved steam channels are formed, when the steam enters the steam channel and moves upwards, the steam contacts the side wall of the splicing plate, and the saturated steam is further defoamed.

[0017] Further, a fixing seat is installed on the inner wall of the low-pressure tank, a driving shaft is rotatably installed on the fixing seat, a first driving wheel is fixedly installed on the upper end of the driving shaft, a second driving wheel is fixedly installed on the lower end of the driving shaft, the inner wall of the rotating frame is rotatably connected with the first driving wheel, and the inner wall of the fixed ring is rotatably connected with the second driving wheel, so that the rotating frame can drive the fixed ring and the breaking frame to rotate.

[0018] Further technical scheme of the present application is that the liquid inlet pipe is L-shaped structure, one end of the liquid inlet pipe extends to outside of the low-pressure tank, and the end is liquid inlet end, the liquid outlet end of the liquid inlet pipe is vertically arranged towards the bottom of the tank body, and the center line of the vertical part of the liquid inlet pipe coincides with the center line of the low-pressure tank.

[0019] Further technical scheme of the present application is that the material of the crushing frame is stainless steel.

[0020] The present application has the following beneficial effects:

[0021] The flash tank for improving the quality of chloroacetic acid product by continuous method, the high-pressure saturated mother liquor enters into the centrifugal rotating seat, drives the centrifugal rotating seat to rotate, and the high-pressure saturated mother liquor is sprayed out in the state of rotating of the centrifugal rotating seat, and the liquid drops can impact on the rotating crushing frame to be crushed, which not only can crush and refine the saturated mother liquor, makes the saturated mother liquor contact with air more fully, improves the efficiency of flash evaporation, and avoids that the saturated mother liquor directly impacts on the inner wall of the low-pressure tank, can effectively prevent the erosion of the internal components of the low-pressure tank. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the perspective view of the specific embodiment of the present application.

[0023] Figure 2 It is the sectional view of the specific embodiment of the present application.

[0024] Figure 3 It is the partial sectional view of the specific embodiment of the present application.

[0025] Figure 4 It is the specific embodiment of the present application Figure 2 The enlarged view of A.

[0026] Figure 5 It is the enlarged view of B in the present application Figure 2 .

[0027] Figure 6 It is the structural schematic view of the centrifugal rotating seat of the specific embodiment of the present application.

[0028] Figure 7 It is the sectional view of the centrifugal rotating seat of the specific embodiment of the present application.

[0029] Figure 8 It is the structural schematic view of the crushing frame of the specific embodiment of the present application.

[0030] Figure 9 It is the structural schematic view of the rotating frame of the specific embodiment of the present application.

[0031] Figure 10 It is the structural schematic view of the defoaming device of the specific embodiment of the present application.

[0032] Figure 11 is a schematic diagram of the defoamer of the specific embodiment of the present application.

[0033] In the figure: 10, low-pressure tank; 11, liquid inlet pipe; 10a, exhaust port; 10b, liquid outlet; 20, centrifugal rotating seat; 20a, liquid inlet cavity; 20b, nozzle cavity; 30, crushing frame; 31, fixed ring; 32, crushing strip; 30a, through hole; 40, impeller; 41, rotating shaft; 42, rotating frame; 43, cleaning plate; 50, fixed seat; 51, drive shaft; 52, first drive wheel; 53, second drive wheel; 60, splicing plate; 60a, steam channel. DETAILED DESCRIPTION

[0034] The flash tank will cavitate due to the vaporization of the oversaturated liquid during use, and the liquid will erode when it is washed on the tank body structure for a long time, which will have a great impact on the service life of the tank body. When the tank body is damaged, the maintenance and replacement of the tank body require high cost

[0035] As Figures 1-11 shown, a flash tank for improving the quality of chloroacetic acid products by continuous method, comprising a low-pressure tank 10 with upper and lower openings and a liquid inlet pipe 11, high-pressure saturated mother liquor enters the low-pressure tank 10 through the liquid inlet pipe 11, and the flash treatment is completed because the high-pressure saturated mother liquor enters a low-pressure environment. The low-pressure tank 10 is also provided with a centrifugal injection assembly, a crushing assembly, and a defoaming mechanism. The saturated mother liquor is uniformly sprayed to the crushing assembly after passing through the centrifugal injection assembly, and the crushing assembly further disperses and refines the mother liquor particles. Finally, saturated steam and saturated liquid are formed. After the defoaming mechanism cleans the foam generated by the rising saturated steam, the saturated steam is discharged from the top of the low-pressure tank 10, and the saturated liquid is discharged from the bottom of the low-pressure tank 10.

[0036] Referring to Figure 1 and Figure 2 , the top of the low-pressure tank 10 is provided with an exhaust port 10a, and the bottom of the low-pressure tank 10 is provided with a liquid outlet 10b, so that the saturated steam formed after the flash treatment can be discharged from the exhaust port 10a at the top, and the saturated liquid can be discharged from the liquid outlet 10b at the bottom. In addition, the liquid inlet pipe 11 has an L-shaped structure, one end of the liquid inlet pipe 11 extends to the outside of the low-pressure tank 10, and this end is the liquid inlet end. The liquid outlet end of the liquid inlet pipe 11 is vertically arranged towards the bottom of the tank body, and the center line of the vertical part of the liquid inlet pipe 11 coincides with the center line of the low-pressure tank 10.

[0037] Continuing to refer to Figure 6 and Figure 7 is a schematic diagram of the centrifugal injection assembly. The centrifugal injection assembly can fully release the pressure of the high-pressure saturated mother liquor, and uniformly spray the saturated mother liquor in a rotating state;

[0038] The centrifugal spraying assembly comprises a centrifugal rotating seat 20 rotatably installed at the liquid outlet end of the liquid inlet pipe 11, a vertical liquid inlet cavity 20a is formed at the center position of the centrifugal rotating seat 20, the upper end of the liquid inlet cavity 20a is communicated with the liquid inlet pipe 11, and a plurality of nozzle cavities 20b are uniformly formed on the circumferential wall of the centrifugal rotating seat 20 along the circumferential direction of the centrifugal rotating seat 20, the nozzle cavities 20b are communicated with the liquid inlet cavity 20a, the saturated mother liquor is introduced into the liquid inlet cavity 20a through the liquid inlet pipe 11, and then is sprayed out through different nozzle cavities 20b;

[0039] Reference Figure 7 The cross section of the nozzle cavity 20b is in an arc shape, one end of the nozzle cavity 20b extends to the liquid inlet cavity 20a, and the other end extends to the circumferential wall of the centrifugal rotating seat 20; when the liquid inlet cavity 20a enters the nozzle cavity 20b, the impact force generated by the liquid acts on the arc-shaped cavity wall, thereby generating an action force for driving the centrifugal rotating seat 20 to rotate, and further driving the centrifugal rotating seat 20 to rotate, reducing the kinetic energy of the high-pressure saturated mother liquor, and uniformly spraying the saturated mother liquor on the crushing assembly in the rotating state of the centrifugal rotating seat 20, so that the saturated mother liquor with a certain speed impacts the crushing assembly to further crush and refine; meanwhile, the diameter of the liquid inlet of the nozzle cavity 20b is smaller than the diameter of the liquid outlet, and is roughly in a horn shape, so that the high-pressure saturated mother liquor can fully release the pressure in the gradually expanding space, and the efficiency of the flash evaporation is improved.

[0040] Reference Figure 2 With Figure 8 The crushing assembly comprises a crushing frame 30 installed in the low-pressure tank 10, the crushing frame is made of stainless steel, and the crushing frame 30 is in an inverted conical structure with an upper opening and a lower opening, the crushing frame 30 is rotatably installed on the inner wall of the low-pressure tank 10 through a fixing ring 31, and the centrifugal rotating seat 20 is located on the inner side of the crushing frame 30, so that the saturated mother liquor sprayed out by the centrifugal rotating seat 20 can impact the crushing frame 30 for crushing, and direct impact of the saturated mother liquor on the inner wall of the low-pressure tank 10 is avoided, so that the erosion of the internal components of the low-pressure tank 10 can be effectively prevented.

[0041] The breaking frame 30 can be driven to rotate by the driving assembly mentioned below, and the rotating direction of the breaking frame 30 is opposite to the rotating direction of the centrifugal rotating seat 20, which can increase the impact force sprayed on the breaking frame 30. The inside surface of the breaking frame 30 is uniformly provided with a plurality of breaking strips 32 arranged at intervals, and the breaking frame 30 is provided with through holes 30a. During the rotation of the breaking frame 30, the breaking strips 32 can further break and refine the saturated mother liquor sprayed from the nozzle cavity 20b, so that the liquid and air can be more fully contacted, which can effectively improve the efficiency of flash evaporation. The finally formed saturated liquid falls after passing through the through holes 30a, or directly slides along the inside surface of the breaking frame 30 to the lower side. In this embodiment, the breaking frame 30 rotates clockwise, and the centrifugal rotating seat 20 rotates counterclockwise. In another embodiment, the breaking frame 30 rotates counterclockwise, and the centrifugal rotating seat 20 rotates clockwise.

[0042] With reference to Figure 2 、 Figure 4 、 Figure 9 、 Figure 10 and Figure 11 , the defoaming mechanism includes a driving defoaming assembly and a defoamer. The driving defoaming assembly can be driven to rotate by the force of the saturated mother liquor flowing in the liquid inlet pipe 11, so as to remove the attached foam in the gas floated upward after the flash evaporation of the saturated mother liquor. Then, the defoamer removes the gas again, so as to ensure the purity of the saturated steam discharged from the gas outlet 10a of the low-pressure tank 10.

[0043] With reference to Figure 2 and Figure 9 , the driving defoaming assembly includes an impeller 40 rotatably installed in the liquid inlet pipe 11. A rotating shaft 41 connected with the impeller 40 is rotatably installed on the liquid inlet pipe 11, and the rotating shaft 41 is sealingly connected with the liquid inlet pipe 11 to prevent the liquid from leaking out of the liquid inlet pipe 11 and the rotating shaft 41. A rotating frame 42 is fixedly installed on the upper end of the rotating shaft 41. A plurality of cleaning plates 43 are uniformly arranged on the inside surface of the rotating frame 42 along the circumferential direction thereof. When the saturated mother liquor flows in the liquid inlet pipe 11, the impeller 40 is driven to rotate, so as to drive the rotating frame 42 and the cleaning plates 43 to rotate. When the saturated steam passes through the inside surface of the rotating frame 42, the foam in the saturated steam is broken when contacting the rotating cleaning plates 43, so as to preliminarily treat the foam in the saturated steam and remove the larger foam.

[0044] As Figure 6As shown, the drive assembly includes a fixed seat 50 mounted on the inner wall of the low-pressure tank 10, a vertically arranged drive shaft 51 rotatably mounted on the fixed seat 50, a first drive wheel 52 fixedly mounted on the upper end of the drive shaft 51, and a second drive wheel 53 fixedly mounted on the lower end of the drive shaft 51, wherein the first drive wheel 52 is rotatably connected with the inner wall of the rotating frame 42, and the second drive wheel 53 is rotatably connected with the inner wall of the fixed ring 31, so that when the saturated mother liquor drives the rotating frame 42 to rotate through the impeller 40, the first drive wheel 52 drives the second drive wheel 53 to rotate, thereby driving the fixed ring 31 and the crushing frame 30 to rotate, and further crushing and refining the saturated mother liquor.

[0045] Further, with reference to Figure 10 and Figure 11 As shown in FIG. 6, which is a structural schematic diagram of a defoamer, the defoamer is located above the active defoaming assembly, wherein the defoamer is composed of a plurality of spliced plates 60, the plurality of spliced plates 60 form a continuous curved structure in the vertical direction, and the plurality of curved structures are arranged horizontally and spaced apart, forming a plurality of continuous curved steam channels 60a (as shown in FIG. 6). Figure 11 When the steam enters the steam channel 60a and moves upward, the steam drives the foam to pass through the bending part of the steam channel 60a and then contacts the side wall of the spliced plate 60, thereby interfering with the steam and changing the flow direction of the steam, which not only effectively reduces the flow speed of the steam, but also breaks the foam, thereby improving the defoaming effect. When the foam accumulates on the side wall of the spliced plate 60 to a certain amount and slides down, the defoaming work on the steam is completed, thereby effectively improving the purity of the steam.

[0046] The structure of the above-mentioned defoamer belongs to the prior art, and the specific structure and principle will not be described in detail. In one embodiment of the present application, the spliced plate 60 is a plate structure, and in other embodiments, the spliced plate 60 can also be a mesh structure or other shapes.

[0047] In addition, it should be understood that although the present specification is described in terms of embodiments, each embodiment does not necessarily contain only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A flash tank for improving the quality of chloroacetic acid products produced by a continuous process, characterized in that: include: The low-pressure tank (10) is a hollow structure with upper and lower ends opened. A fixing seat (50) is installed on the inner wall of the low-pressure tank (10). A driving shaft (51) is rotatably installed on the fixing seat (50). A first driving wheel (52) is fixedly installed on the upper end of the driving shaft (51), and a second driving wheel (53) is fixedly installed on the lower end of the driving shaft (51). a liquid inlet pipe (11), installed on the low-pressure tank (10), for supplying saturated mother liquor into the low-pressure tank (10); The centrifugal spray assembly comprises a centrifugal turntable (20) rotatably mounted on the liquid outlet end of the liquid inlet pipe (11); a vertical liquid inlet cavity (20a) is provided at the center of the centrifugal turntable (20); the upper end of the liquid inlet cavity (20a) is communicated with the liquid inlet pipe (11); and a plurality of nozzle cavities (20b) are provided on the circumferential wall of the centrifugal turntable (20) along its circumferential direction; the nozzle cavities (20b) are communicated with the liquid inlet cavity (20a), and the cross section of the nozzle cavities (20b) is an arc-shaped structure, so that when high-pressure saturated mother liquid enters the nozzle cavities (20b), the nozzle cavities (20b) can be driven to rotate, and the nozzle cavities (20b) spray out the saturated mother liquid in the rotating state; the diameter of the liquid inlet of the nozzle cavities (20b) is smaller than the diameter of the liquid spraying port, and the high-pressure saturated mother liquid is sprayed in the gradually expanding space on the nozzle cavities (20b), which can fully release the pressure; The crushing assembly includes a crushing frame (30), a fixing ring (31) is fixedly mounted on the upper surface of the crushing frame (30), and the crushing frame (30) is rotatably mounted on the inner wall of the low-pressure tank (10) through the fixing ring (31). The crushing frame (30) is provided with crushing bars (32), and saturated mother liquid droplets sprayed out from the nozzle cavity (20b) will impact the rotating crushing bars (32), so that the saturated mother liquid droplets are crushed again; A defoaming mechanism for treating foam generated in a saturated steam body that floats upward after flash evaporation of a saturated mother liquid comprises an impeller (40) rotatably mounted in a liquid inlet pipe (11), a rotating shaft (41) connected to the impeller (40) being rotatably mounted on the liquid inlet pipe (11), a rotating frame (42) being fixedly mounted on the upper end of the rotating shaft (41), a plurality of cleaning plates (43) being uniformly arranged on the inner side of the rotating frame (42) along its circumferential direction, and when the saturated mother liquid flows in the liquid inlet pipe (11), the impeller (40) is driven to rotate, thereby driving the rotating frame (42) and the cleaning plates (43) to rotate, thereby defoaming foam generated in the passing saturated steam; The first driving wheel (52) is rotatably connected to the inner wall of the rotating frame (42), and the second driving wheel (53) is rotatably connected to the inner wall of the fixing ring (31), so that the rotating frame (42) can drive the fixing ring (31) and the crushing frame (30) to rotate.

2. A flash tank for improving the quality of a continuous process chloroacetic acid product according to claim 1, characterized in that: The crushing frame (30) is an inverted cone-shaped structure with upper and lower openings.

3. A flash tank for improving the quality of a continuous process chloroacetic acid product according to claim 1, characterized in that: The centrifugal jet assembly is located inside the crushing frame (30), and the crushing frame (30) and the centrifugal jet assembly rotate in opposite directions.

4. A flash tank for improving the quality of a continuous process chloroacetic acid product according to claim 3, characterized in that: The defoaming mechanism also includes a defoamer, which is installed above the rotating frame (42). The defoamer is composed of a plurality of splicing plates (60), and the plurality of splicing plates (60) form a continuously curved structure along the vertical direction. The plurality of curved structures are arranged horizontally at intervals to form a plurality of continuously curved steam channels (60a). When steam enters the steam channel (60a) and moves upward, it contacts the side wall of the splicing plate (60) to perform defoaming.

5. A flash tank for improving the quality of a continuous process chloroacetic acid product according to claim 3, characterized in that: The liquid inlet pipe (11) is an L-shaped structure, one end of the liquid inlet pipe (11) extends to the outside of the low-pressure tank (10), and this end is the liquid inlet end, the liquid outlet end of the liquid inlet pipe (11) is vertically arranged toward the bottom of the tank body, and the center line of the vertical part of the liquid inlet pipe (11) coincides with the center line of the low-pressure tank (10).

6. A flash tank for improving the quality of a continuous process chloroacetic acid product according to claim 2, characterized in that: The material of the crushing frame (30) is stainless steel.

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