Treatment system for o-hydroxyphenylacetic acid mother liquor resin desorption solution in azoxystrobin production wastewater

Abstract

The utility model provides a treatment system for an o-hydroxyphenylacetic acid mother liquor resin desorption solution in azoxystrobin production wastewater, the treatment system comprises a desorption solution intermediate tank, a decolorization kettle and a concentration kettle which are communicated in sequence, and a top outlet of the concentration kettle is communicated with a condenser and a condensate water treatment tank in sequence; a bottom outlet of the concentration kettle is connected with a centrifugal machine; a solid-phase outlet of the centrifugal machine is connected with a sodium chloride receiving tank, a liquid-phase outlet of the centrifugal machine is connected with a mother liquor intermediate tank, and the mother liquor intermediate tank is communicated with an inlet of the concentration kettle through a liquid return pipe; the decolorizing kettle is also connected with a hydrochloric acid storage tank and a hydrogen peroxide storage tank. According to the method, efficient treatment of the o-hydroxyphenylacetic acid mother liquor resin desorption solution in the azoxystrobin production wastewater is achieved, and meanwhile economic benefits are brought to enterprises through export sales of generated sodium chloride.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, and particularly relates to a treatment system for a liquid of a mother liquor of o-hydroxyphenylacetic acid in azoxystrobin production wastewater. BACKGROUND

[0002] Azoxystrobin is a methoxy acrylate fungicide, which is efficient and broad-spectrum, and has good activity on almost all fungal diseases such as powdery mildew, rust, leaf blight, net blotch, downy mildew and rice blast.

[0003] In the production process of azoxystrobin, o-hydroxyphenylacetic acid is used as a key intermediate to participate in the synthesis of azoxystrobin. In the production process, wastewater is generated. In the prior art, the o-hydroxy mother liquor is adsorbed from the wastewater by a resin, and then the resin column is hydrolyzed by dilute lye to resolve the o-hydroxy mother liquor. The dilute lye after resolution is red, and is returned to the o-hydroxyphenylacetic acid system, which makes the treatment of the o-hydroxy mother liquor more and more difficult, and affects the product yield. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a treatment system for a liquid of a mother liquor of o-hydroxyphenylacetic acid in azoxystrobin production wastewater, to solve the above problems mentioned in the background.

[0005] The present application provides a treatment system for a liquid of a mother liquor of o-hydroxyphenylacetic acid in azoxystrobin production wastewater, which comprises an intermediate tank for the resolving liquid, a decoloring kettle and a concentration kettle which are sequentially connected, a condenser and a condensate treatment tank which are sequentially connected to the top outlet of the concentration kettle, and a centrifuge connected to the bottom outlet of the concentration kettle.

[0006] The solid phase outlet of the centrifuge is connected to a sodium chloride receiving tank, and the liquid phase outlet of the centrifuge is connected to a mother liquor intermediate tank, and the mother liquor intermediate tank is communicated with the inlet of the concentration kettle through a liquid return pipe.

[0007] The decoloring kettle is further connected to a hydrochloric acid storage tank and a hydrogen peroxide storage tank.

[0008] Optionally, the treatment system further comprises an activated carbon feeding tank, and the discharge port of the activated carbon feeding tank is communicated with the decoloring kettle.

[0009] Optionally, a filter is arranged on the pipeline connecting the decoloring kettle and the concentration kettle.

[0010] Optionally, a high tank is further connected between the bottom outlet of the concentration kettle and the centrifuge, and the outlet of the high tank is communicated with the inlet of the centrifuge.

[0011] Optionally, the decoloring kettle, the concentration kettle and the high tank are all provided with a stirring unit, and the stirring unit comprises a motor, a stirring rod, a stirring paddle and a scraper.

[0012] The output end of the motor is connected with one end of the stirring rod, the outer periphery of the side surface of the stirring rod is provided with stirring paddles, the bottom of the stirring rod is connected with a scraper, and the bottom of the scraper is in contact with the inner bottom surface of the container where the stirring unit is located.

[0013] Optionally, the two ends of the bottom of the scraper are connected with support spheres, the support sphere comprises a connecting shaft, a bearing and support balls, one end of the connecting shaft is fixedly connected with the scraper, the other end of the connecting shaft is fixedly connected with the inner ring of the bearing, the support balls are semicircular and spherical, the spherical end of the support ball is in contact with the inner wall of the container, and the other end of the support ball is fixedly connected with the outer ring of the bearing.

[0014] Optionally, a pH meter is arranged in the decoloring kettle.

[0015] The treatment system for the mother liquor resin desorption liquid of o-hydroxyphenylacetic acid in the azoxystrobin production wastewater provided in the application realizes the treatment of the mother liquor resin desorption liquid of o-hydroxyphenylacetic acid in the azoxystrobin production wastewater, and has the following beneficial effects compared with the prior art:

[0016] (1) In the application, the dilute alkaline water containing the o-hydroxyphenylacetic acid mother liquor is not directly returned to the desorption process of the o-hydroxyphenylacetic acid, but is subjected to decoloring treatment, oxidation treatment, concentration centrifugal treatment to obtain sodium chloride solids with economic benefits, and the finally obtained mother liquor is returned to the concentration kettle for further concentration. This setting not only avoids the problem that the direct return of the red dilute alkaline water containing the o-hydroxyphenylacetic acid mother liquor leads to difficult treatment of the o-hydroxyphenylacetic acid mother liquor and low quality of the o-hydroxyphenylacetic acid, but also improves the yield of the o-hydroxyphenylacetic acid, the yield and quality of the product azoxystrobin, and the sale of sodium chloride brings economic benefits to the enterprise and reduces the production cost of the enterprise.

[0017] (2) The support sphere is arranged in the application to support the stirring unit, so that the stirring unit operates more stably. The connecting shaft is used to connect the scraper and the bearing, the other end of the connecting shaft is fixedly connected with the inner ring of the bearing, the scraper is driven to rotate by the stirring rod when the stirring unit works, the scraper drives the connecting shaft to move, the spherical end of the support ball is in contact with the inner wall of the container, and the other end of the support ball is fixedly connected with the outer ring of the bearing, so that the support ball rolls along the inner wall of the container. This setting not only supports the stirring unit, but also does not increase the friction of the stirring unit to the inner wall during the rolling of the support ball, thereby improving the operating stability of the stirring unit.

[0018] (3) The treatment system for the mother liquor resin desorption liquid of o-hydroxyphenylacetic acid provided in the application is convenient to operate and is convenient for large-scale use in factories. BRIEF DESCRIPTION OF DRAWINGS

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a treatment system for the eluent from the mother liquor of o-hydroxyphenylacetic acid provided in an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the structure of a treatment system for the eluent of o-hydroxyphenylacetic acid mother liquor resin provided in another embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the structure of a stirring unit provided in an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the structure of a supporting sphere provided in one embodiment of this application;

[0024] Explanation of reference numerals in the attached figures:

[0025] 1: Intermediate tank for eluent, 2: Decolorization kettle, 3: Concentration kettle, 4: Condenser, 5: Condensate treatment tank, 6: Centrifuge, 210: Hydrochloric acid storage tank, 220: Hydrogen peroxide storage tank, 230: Activated carbon feeding tank, 240: Filter, 250: pH meter, 310: High-level tank, 610: Sodium chloride receiving tank, 620: Intermediate tank for mother liquor, 621: Return pipe, 710: Motor, 720: Stirring rod, 730: Stirring paddle, 740: Scraper, 750: Support ball, 751: Connecting shaft, 752: Bearing, 753: Support ball. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0027] like Figure 1 As shown, this application provides a treatment system for the resin eluent from the o-hydroxyphenylacetic acid mother liquor in azoxystrobin production wastewater, including an intermediate tank 1, a decolorizing tank 2, and a concentrator 3 connected in sequence. The top outlet of the concentrator 3 is connected in sequence to a condenser 4 and a condensate treatment tank 5; the bottom outlet of the concentrator 3 is connected to a centrifuge 6.

[0028] The centrifuge 6 is connected with a sodium chloride receiving tank 610 at the solid phase outlet, and is connected with a mother liquor intermediate tank 620 at the liquid phase outlet, and the mother liquor intermediate tank 620 is communicated with the inlet of the concentration kettle 3 through a liquid return pipe 621;

[0029] The decoloring kettle 2 is further connected with a hydrochloric acid storage tank 210 and a hydrogen peroxide storage tank 220.

[0030] Specifically, in the production of azoxystrobin, after the o-hydroxy mother liquor is adsorbed from the wastewater by the resin, the o-hydroxy mother liquor is eluted from the resin column by using dilute lye to obtain dilute lye containing o-hydroxy phenylacetic acid mother liquor (i.e., o-hydroxy phenylacetic acid mother liquor resin eluate). The dilute lye containing o-hydroxy phenylacetic acid mother liquor contains alkali, COD, o-hydroxy phenylacetic acid and other small amounts of organic matter. The dilute lye containing o-hydroxy phenylacetic acid mother liquor is temporarily stored in the eluate intermediate tank 1, and is first pumped into the decoloring kettle 2 by a pump body, the valve of the hydrochloric acid storage tank 210 is opened, and hydrochloric acid is added to the decoloring kettle 2, the pH of the material in the decoloring kettle 2 is adjusted to neutral, then the valve of the hydrogen peroxide storage tank 220 is opened, and hydrogen peroxide is added to the decoloring kettle 2, so that the dilute lye containing o-hydroxy phenylacetic acid mother liquor is oxidized by the hydrogen peroxide, so that the color of the material in the decoloring kettle 2 is lightened, and the COD is removed.

[0031] After the decoloring is completed, the material in the decoloring kettle 2 is pumped into the concentration kettle 3 for heating and concentration. During the concentration process, water vapor is obtained at the top of the concentration kettle 3, and the water vapor enters the condenser 4 for condensation to obtain condensed water, which enters the condensed water treatment tank 5 and is finally sent to a condensed water biochemical water treatment process as wastewater for treatment. After the decoloring treatment, the dilute lye containing o-hydroxy phenylacetic acid mother liquor contains sodium chloride, and in the concentration process, water is continuously evaporated, and the sodium chloride solid in the water is precipitated to obtain a slurry containing sodium chloride solid in the concentration kettle 3. When no water vapor is generated at the top of the concentration kettle 3, the concentration is completed, and the slurry in the concentration kettle 3 is pumped into the centrifuge 6 for solid-liquid separation to obtain sodium chloride solid and treated mother liquor, the sodium chloride solid enters the sodium chloride receiving tank 610, and the sodium chloride solid is used as a byproduct or sold, which brings certain economic benefits to the enterprise. At the same time, the treated mother liquor obtained from the liquid phase outlet of the centrifuge 6 is temporarily stored in the mother liquor intermediate tank 620, and is returned to the concentration kettle 3 through a pump body to be concentrated again, so as to further improve the precipitation rate of the sodium chloride solid and improve the yield of the sodium chloride, thereby bringing certain economic benefits to the enterprise.

[0032] The application realizes the treatment of the o-hydroxyphenylacetic acid mother liquor resin resolution liquid. In the application, the dilute lye containing the o-hydroxyphenylacetic acid mother liquor is not directly returned to the resolution process of the o-hydroxyphenylacetic acid, but is subjected to decolorization treatment, oxidation treatment, concentration centrifugal treatment to obtain sodium chloride solids with economic benefits, and the finally obtained mother liquor is returned to the concentration kettle 3 for further concentration. The arrangement avoids the problems of difficult treatment of the o-hydroxyphenylacetic acid mother liquor and low quality of the o-hydroxyphenylacetic acid caused by the direct return of the red dilute lye containing the o-hydroxyphenylacetic acid mother liquor, improves the yield of the o-hydroxyphenylacetic acid, improves the yield and quality of the product azoxystrobin, and the sale of the sodium chloride brings economic benefits to the enterprise and reduces the production cost of the enterprise.

[0033] As shown in Figure 2 Optionally, the treatment system is further provided with an activated carbon feeding tank 230, and the discharge port of the activated carbon feeding tank 230 is communicated with the decolorization kettle 2.

[0034] Specifically, after the hydrogen peroxide oxidation, activated carbon is fed into the decolorization kettle 2 through the activated carbon feeding tank 230. The activated carbon has good adsorption and decolorization effect, can further decolorize the material in the decolorization kettle 2, and can improve the quality of the subsequent sodium chloride solids.

[0035] As shown in Figure 2 Optionally, a filter 240 is arranged on the pipeline connecting the decolorization kettle 2 and the concentration kettle 3.

[0036] Specifically, the dilute lye containing the o-hydroxyphenylacetic acid mother liquor after the decolorization of the decolorization kettle 2 is filtered through the filter 240 to filter out the impurities and activated carbon, so as to avoid the blockage of the pipeline and equipment by the material, and to avoid the attachment of the sodium chloride solids to the surface of the impurities and activated carbon during the concentration process in the concentration kettle 3. By arranging the filter 240, the treatment efficiency of the o-hydroxyphenylacetic acid mother liquor resin resolution liquid is improved, and the quality of the sodium chloride is improved.

[0037] As shown in Figure 2 Optionally, a high tank 310 is further connected between the bottom outlet of the concentration kettle 3 and the centrifugal machine 6, and the outlet of the high tank 310 is communicated with the inlet of the centrifugal machine 6.

[0038] Specifically, the high tank 310 is used for temporarily storing the slurry after the concentration of the concentration kettle 3 and inputting the slurry into the centrifugal machine 6 under the action of gravity, so that the concentration kettle 3 can work continuously and the treatment efficiency of the system is improved.

[0039] As shown in Figure 3 Optionally, the decolorization kettle 2, the concentration kettle 3 and the high tank 310 are all provided with a stirring unit, and the stirring unit comprises a motor 710, a stirring rod 720, a stirring paddle 730 and a scraper 740.

[0040] The output end of the motor 710 is connected with one end of the stirring rod 720, the outer periphery of the side of the stirring rod 720 is provided with the stirring paddle 730, the bottom of the stirring rod 720 is connected with the scraper 740, and the bottom of the scraper 740 is in contact with the inner bottom surface of the container where the stirring unit is located.

[0041] Specifically, the stirring unit is used for stirring the materials in the decoloring kettle 2, the concentration kettle 3 and the head tank 310 respectively, so as to improve the processing efficiency of the o-hydroxyphenylacetic acid mother liquor resin eluent.

[0042] When the stirring unit works, the motor 710 is started to provide power, the stirring rod 720 is driven to rotate, the stirring rod 720 drives the stirring paddle 730 and the scraper 740 to rotate, and the rotation of the stirring paddle 730 and the scraper 740 can drive the materials to stir, so that the materials produce turbulent flow. In the decoloring kettle 2, the contact efficiency of hydrochloric acid, hydrogen peroxide and activated carbon with the eluent can be improved, and the decoloring efficiency is improved. In the concentration kettle 3, the stirring of the stirring unit can improve the uniformity of the materials, and the escape of water vapor is improved, and the concentration efficiency is improved. The stirring unit arranged in the head tank 310 can avoid the stratification of heavy components and light components in the slurry, and the stable operation of the centrifuge 6 is facilitated.

[0043] The bottom of the scraper 740 is in contact with the inner bottom surface of the container where the stirring unit is located. This arrangement can avoid the heavy components in the materials from sinking to the bottom, and is beneficial to the uniform state of the materials and the efficient operation of the system.

[0044] The container refers to the decoloring kettle 2, the concentration kettle 3 and the head tank 310.

[0045] As shown in Figure 4 Optionally, the two ends of the bottom of the scraper 740 are connected with support balls 750, the support ball 750 includes a connecting shaft 751, a bearing 752 and a support ball 753, one end of the connecting shaft 751 is fixedly connected with the scraper 740, the other end of the connecting shaft 751 is fixedly connected with the inner ring of the bearing 752, the support ball 753 is semicircular and spherical, the spherical end of the support ball 753 is in contact with the inner wall of the container, and the other end of the support ball 753 is fixedly connected with the outer ring of the bearing 752.

[0046] Specifically, the support ball 750 is used for supporting the stirring unit, so that the stirring unit operates more stably. The connecting shaft 751 is used for connecting the scraper 740 and the bearing 752, and the other end of the connecting shaft 751 is fixedly connected with the inner ring of the bearing 752. When the stirring unit works, the stirring rod 720 drives the scraper 740 to rotate, the scraper 740 drives the connecting shaft 751 to move, the spherical end of the support ball 753 is in contact with the inner wall of the container, and the other end of the support ball 753 is fixedly connected with the outer ring of the bearing 752, so that the support ball 753 rolls along the inner wall of the container. The arrangement not only achieves the effect of supporting the stirring unit, but also does not increase the friction of the stirring unit on the inner wall during the rolling of the support ball 753, thereby improving the stability of the stirring unit.

[0047] Optionally, the decoloring kettle 2 is provided with a pH meter 250.

[0048] Specifically, when hydrochloric acid is added to the decoloring kettle 2, whether the reading of the pH meter 250 reaches pH 7 can be observed to determine the amount of hydrochloric acid added, thereby improving the convenience of system operation.

[0049] The technical scheme of the present application will be described in detail below with specific examples.

[0050] The treatment system of the mother liquor resin elution liquid of o-hydroxyphenylacetic acid in the azoxystrobin production wastewater in the embodiment is as follows in the running process during specific work:

[0051] The o-hydroxyphenylacetic acid mother liquor resin elution liquid is temporarily stored in the elution liquid intermediate tank 1. The dilute lye containing the o-hydroxyphenylacetic acid mother liquor is first pumped into the decoloring kettle 2 through the pump body. The valve of the hydrochloric acid storage tank 210 is opened, and hydrochloric acid is added to the decoloring kettle 2. The pH of the material in the decoloring kettle 2 is adjusted. When the reading of the pH meter 250 reaches pH 7, the valve on the hydrogen peroxide storage tank 220 is opened, and hydrogen peroxide is added to the decoloring kettle 2. The hydrogen peroxide oxidizes the dilute lye containing the o-hydroxyphenylacetic acid mother liquor, and the color of the material in the decoloring kettle 2 becomes lighter, and the COD in the material is removed. Preferably, the mass concentration of the hydrogen peroxide is 10%-15%.

[0052] After the decolorization is completed, the material in the decolorization kettle 2 is pumped into the concentration kettle 3 for heating and concentration, and water vapor is obtained at the top of the concentration kettle 3 during the concentration process, and the water vapor enters the condenser 4 for condensation to obtain condensed water, which enters the condensed water treatment tank 5 and is finally sent to the condensed water biochemical water treatment process as wastewater for treatment. After the decolorization treatment, the dilute liquid alkali water containing o-hydroxyphenylacetic acid mother liquor contains sodium chloride, which is precipitated in the concentration process, and the slurry containing sodium chloride solid is obtained in the concentration kettle 3. When no water vapor is generated at the top of the concentration kettle 3, the concentration is completed, and the slurry in the concentration kettle 3 is pumped into the centrifuge 6 for solid-liquid separation to obtain sodium chloride solid and treated mother liquor, and the sodium chloride solid is used as a byproduct or sold, which brings certain economic benefits to the enterprise. At the same time, the treated mother liquor obtained from the liquid phase outlet of the centrifuge 6 is temporarily stored in the mother liquor intermediate tank 620 and is returned to the concentration kettle 3 for re-concentration through the pump body, further improving the precipitation rate of sodium chloride solid and improving the yield of sodium chloride, which brings certain economic benefits to the enterprise.

[0053] During the operation of the system, the stirring units in the decolorization kettle 2, the concentration kettle 3 and the high tank 310 are started at the same time, the motor 710 is started to provide power, the stirring rod 720 is driven to rotate, the stirring rod 720 drives the stirring paddle 730 and the scraper 740 to rotate, the rotation of the stirring paddle 730 and the scraper 740 can stir the material to make the material produce turbulent flow, thereby improving the treatment efficiency of the material. At the same time, the supporting ball 753 supports and stabilizes the stirring unit.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that; it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A treatment system for a mother liquor resin eluate of o-hydroxyphenylacetic acid in azoxystrobin production wastewater, characterized by, It comprises an analysis liquid intermediate tank (1), a decoloring kettle (2) and a concentration kettle (3) connected in sequence, the top outlet of the concentration kettle (3) is connected with a condenser (4) and a condensed water treatment tank (5) in sequence; the bottom outlet of the concentration kettle (3) is connected with a centrifuge (6); The solid phase outlet of the centrifuge (6) is connected with a sodium chloride receiving tank (610), the liquid phase outlet of the centrifuge (6) is connected with a mother liquor intermediate tank (620), and the mother liquor intermediate tank (620) is communicated with the inlet of the concentration kettle (3) through a liquid return pipe (621); The decoloring kettle (2) is also connected with a hydrochloric acid storage tank (210) and a hydrogen peroxide storage tank (220).

2. The treatment system for the mother liquor resin eluate in the production wastewater of vinclozolin and o-hydroxyphenylacetic acid according to claim 1, characterized in that, The treatment system is also provided with an activated carbon feeding tank (230), and the discharge port of the activated carbon feeding tank (230) is communicated with the decoloring kettle (2).

3. The treatment system for the mother liquor resin eluate in the vertaconazole production wastewater according to claim 1, characterized by, A filter (240) is arranged on the pipeline connecting the decoloring kettle (2) and the concentration kettle (3).

4. The treatment system for the mother liquor resin eluate in the vertaconazole production wastewater according to claim 1, characterized by, A high tank (310) is further connected between the bottom outlet of the concentration kettle (3) and the centrifuge (6), and the outlet of the high tank (310) is communicated with the inlet of the centrifuge (6).

5. The treatment system for the mother liquor resin eluate in the production of vertaconazole according to claim 4, characterized by, The decoloring kettle (2), the concentration kettle (3) and the high tank (310) are all provided with a stirring unit, and the stirring unit comprises a motor (710), a stirring rod (720), a stirring paddle (730) and a scraper (740). The output end of the motor (710) is connected with one end of the stirring rod (720), the outer periphery of the side surface of the stirring rod (720) is provided with the stirring paddle (730), the bottom of the stirring rod (720) is connected with the scraper (740), and the bottom of the scraper (740) is connected with the inner bottom surface of the container.

6. The treatment system for the mother liquor resin eluate in the vertaconazole production wastewater according to claim 5, characterized by, Both ends of the bottom of the scraper (740) are connected with support balls (750), the support balls (750) comprise a connecting shaft (751), a bearing (752) and a support ball (753), one end of the connecting shaft (751) is fixedly connected with the scraper (740), the other end of the connecting shaft (751) is fixedly connected with the inner ring of the bearing (752), the support ball (753) is semicircular and spherical, the spherical end of the support ball (753) is connected with the inner wall of the container, and the other end of the support ball (753) is fixedly connected with the outer ring of the bearing (752).

7. The treatment system for the mother liquor resin eluate in the production of wastewater of vinclozolin according to any one of claims 1 to 6, characterized in that, A pH meter (250) is arranged in the decoloring kettle (2).

Images