Toluene wastewater treatment equipment and method for flame retardant resin production

Abstract

The present invention provides a toluene wastewater treatment device and method for flame retardant resin production, and relates to the technical field of flame retardant resin production. It includes a steam conveying device and an evaporator, wherein a stirring evaporation zone is provided in the evaporator, wherein the stirring evaporation zone includes a plurality of separately arranged stirring sub-zones, and the chemical wastewater is stirred by a stirring structure provided in the stirring sub-zone. The present invention divides the stirring evaporation zone into a plurality of stirring sub-zones, so that the liquid is diverted into each stirring sub-zone, thereby reducing the total amount of liquid heated at a single time, thereby reducing the possibility of explosive boiling of the toluene waste liquid, and has the advantages of being green, energy-saving, and easy to implement.

Description

Technical Field

[0001] The present invention belongs to the technical field of flame-retardant resin production, and particularly relates to a toluene wastewater treatment device and method for flame-retardant resin production. Background Art

[0002] In the process of chemical production, process wastewater, cooling water, waste washing water, equipment and site flushing water, etc. containing toluene in the production of flame-retardant resin have a large discharge volume and complex components. The reaction raw materials are often solvent substances or compounds with a cyclic structure, which increases the difficulty of wastewater treatment. A large amount of pollutant substances are contained in this wastewater, mainly due to incomplete reaction of raw materials and the use of a large amount of solvents in raw materials or production. Moreover, the production wastewater of flame-retardant resin containing toluene contains many toxic and harmful substances, has a high organic matter concentration, a high salt content, a high chroma, a high content of refractory compounds, and a large amount of biologically refractory substances, with poor biodegradability and great treatment difficulty.

[0003] Brominated epoxy resin has good self-extinguishing and heat resistance properties, and is low in toxicity. It is a new type of epoxy resin developed in recent years. Its molecular structure contains bromine. It not only has excellent electrical insulation and adhesiveness of general epoxy resins, but also has excellent self-flame retardancy. At the same time, since brominated epoxy resin does not produce dioxin problems, it is a new type of environmentally friendly flame retardant and has currently become one of the important substitutes for decabromodiphenyl ether.

[0004] In the production of brominated epoxy resin, production wastewater of flame-retardant resin containing toluene is also generated, and its components mainly include sodium chloride, toluene in the solvent, and water.

[0005] Toluene is a member of aromatic hydrocarbons. Many of its properties are very similar to those of benzene. In current practical applications, it often replaces benzene with considerable toxicity as an organic solvent, and is also a commonly used chemical raw material, which can be used to manufacture explosives, pesticides, benzoic acid, dyes, synthetic resins, polyester, etc.

[0006] For a large amount of production wastewater of flame-retardant resin containing toluene, it needs to be heated by the triple-effect method.

[0007] The triple-effect method adopts the working principle of external heating by tubular circulation, with a short physical heating time, a fast evaporation speed, a large concentration ratio, effectively maintaining the original efficiency of the material, and remarkable energy-saving effect. It is widely suitable for the evaporation and concentration process of liquid materials in pharmaceuticals, chemicals, food, light industry, etc.

[0008] In the process of heating a large amount of production wastewater of flame-retardant resin containing toluene in a triple-effect evaporator, since toluene is an organic compound with a relatively low boiling point, when heated, the aqueous solution containing toluene is likely to produce a sudden boiling phenomenon, or a local boiling phenomenon similar to an explosion-like one, which will affect the process of the triple-effect method and even pose a danger.

[0009] In summary, how to provide a method and equipment for treating toluene-containing flame retardant resin production wastewater that can reduce boiling phenomenon is a technical problem that urgently needs to be solved. Summary of the invention

[0010] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a toluene wastewater treatment device and method for flame retardant resin production, by diverting the flame retardant resin production wastewater containing toluene into a separated stirring bar area, and separately stirring the flame retardant resin production wastewater containing toluene, thereby preventing the explosive boiling of toluene.

[0011] The invention provides a toluene wastewater treatment device for flame retardant resin production, comprising a steam conveying device and an evaporator, wherein a stirring evaporation zone is arranged in the evaporator, and the stirring evaporation zone comprises a plurality of separately arranged stirring sub-zones, and a stirring structure is arranged in the stirring sub-zone to stir flame retardant resin production wastewater containing toluene.

[0012] Further, the stirring evaporation zone is fixedly connected to the inner wall of the evaporator, or the stirring evaporation zone is movable in the evaporator.

[0013] Further, the stirring evaporation zone is slidably connected to the inner wall of the evaporator;

[0014] And / or, a movable plate is arranged at the bottom of the stirring sub-area, and the movable plate is movably installed in the base, and at least one side of the movable plate can be lifted or lowered.

[0015] Furthermore, the stirring structure includes a steam-driven propeller structure disposed at the steam outlet of the evaporator.

[0016] Furthermore, the propeller structure includes an upper propeller and a lower propeller connected by a central axis; wherein the upper propeller is located above the liquid surface, and the upper arm propeller is configured to be rotated by steam; and the lower propeller is located below the liquid surface.

[0017] Furthermore, the propeller structure is connected to the inner wall of the stirring sub-area through a fixed arm; the fixed arm is rotatably connected to the central axis through a bearing, and when the upper propeller rotates, the lower propeller is driven to rotate through the central axis.

[0018] Furthermore, the upper propeller includes a blade seat, on which a plurality of blades are arranged at intervals; a wind tunnel is penetrated through the blade seat, and a gas pipe is arranged corresponding to the wind tunnel, and steam is introduced into the wind tunnel through the gas pipe; and / or, the lower propeller is connected to the central shaft through a gear set.

[0019] Further, on the inner wall of the stirrer area, there are symmetrically arranged convex parts that are inclined on both sides, and the aforementioned upper propeller is located between the convex parts; an upper positive V cavity with a V-shaped structure that is wider at the top and narrower at the bottom is formed around the upper propeller through the convex parts, and a lower inverted V cavity with an inverted V-shaped structure that is wider at the bottom and narrower at the top is formed above the lower propeller.

[0020] Further, a narrowed section that converges is formed at the junction of the upper positive V cavity and the lower inverted V cavity, and the width of the narrowed section is less than or equal to the width of the lower end of the upper positive V cavity and the width of the upper end of the lower inverted V cavity; the steam in the stirrer area enters the upper positive V cavity after passing through the lower inverted V cavity and reaching the narrowed section.

[0021] The present invention provides a wastewater treatment method for a toluene wastewater treatment device for producing flame-retardant resin using any one of the above, and the method includes the following steps: inputting the toluene-containing wastewater for producing flame-retardant resin into an evaporator; diverting and feeding the toluene-containing wastewater for producing flame-retardant resin into several stirrer areas in the stirring evaporation area; stirring the toluene-containing wastewater for producing flame-retardant resin through the stirring structure in the stirrer area to evaporate the toluene-containing wastewater for producing flame-retardant resin.

[0022] Due to the adoption of the above technical solutions, compared with the prior art, for example, the present invention has the following advantages and positive effects:

[0023] By dividing the stirring evaporation area into multiple stirrer areas, the liquid is diverted into each stirrer area, reducing the total amount of liquid heated at one time, thereby reducing the possibility of the waste liquid boiling over.

[0024] A stirring structure is arranged in the stirrer area to stir the liquid, making the liquid heated more evenly, thereby reducing the possibility of the waste liquid boiling over.

[0025] The stirring structure drives the lower propeller to rotate by using the steam-driven upper propeller, thereby forming a virtuous cycle in the stirrer area where the steam generated by the liquid evaporation is used as a power source to drive the propeller structure to stir the liquid and assist the liquid evaporation, making full use of the steam, facilitating energy conservation, and reducing the energy consumption of the equipment.

[0026] By symmetrically arranging convex parts on both sides of the stirring structure, it can play a role in converging and buffering the airflow, strengthening the acting force of the airflow on the upper propeller. The upper propeller rotates under the impact force of the airflow and drives the lower propeller to rotate, strengthening the stirring effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the evaporator provided by the present invention.

[0028] Figure 2Schematic diagram of the structure of the magnetic stirrer area provided by the present invention.

[0029] Figure 3 Schematic diagram of the structure of the magnetic stirrer area provided by the present invention, which is another embodiment.

[0030] Figure 4 Schematic diagram of the structure of the magnetic stirrer area provided by the present invention, which is another embodiment.

[0031] Figure 5 Schematic diagram of the structure of the magnetic stirrer area provided by the present invention, which is another embodiment.

[0032] Figure 6 Schematic diagram of the structure of the upper propeller provided by the present invention.

[0033] Figure 7 Schematic diagram of the structure of the moving plate provided by the present invention.

[0034] Description of reference numerals

[0035] Toluene wastewater treatment equipment 100 for the production of flame retardant resin;

[0036] Evaporator 200, first-effect evaporator 210, second-effect evaporator 220, third-effect evaporator 230, feed inlet 240;

[0037] Stirring evaporation zone 300, magnetic stirrer area 310, liquid inlet 311, propeller structure 320, upper propeller 321, blade seat 321-1, blade 321-2, wind tunnel 321-3, gas pipeline 321-4, lower propeller 322, central axis 323, fixed arm 324, bearing 325, moving plate 330, base 340;

[0038] Protrusion 400, upper positive V cavity 410, narrow section 420, lower inverted V cavity 430. Detailed implementation manners

[0039] The following provides a detailed description of the technical solutions disclosed by the present invention in conjunction with specific embodiments.

[0040] For technologies and methods known to those of ordinary skill in the relevant fields, they may not be discussed in detail, but where appropriate, such technologies and methods should be regarded as part of the specification. In all examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0042] The present invention provides a toluene wastewater treatment device for the production of flame-retardant resin, including a steam delivery device (not shown in the figure), as Figure 1 shown, further including an evaporator 200, and the evaporator includes a first-effect evaporator 210, a second-effect evaporator 220, and a third-effect evaporator 230 that are connected in series.

[0043] Through the feed port, the toluene-containing wastewater from the production of flame-retardant resin sequentially enters the first-effect evaporator 210, the second-effect evaporator 220, and the third-effect evaporator 230. Steam generated by the previous evaporator is introduced into the next evaporator as a heating source between multiple evaporators.

[0044] Particularly, a stirring evaporation area is provided inside the evaporator. For example, a stirring evaporation area can be provided in at least one of the first-effect evaporator 210, the second-effect evaporator 220, and the third-effect evaporator 230.

[0045] The stirring evaporation area includes several separately arranged stirring sub-areas. By way of example rather than limitation, the stirring evaporation area can be divided into several different stirring sub-areas by setting partition plates. The stirring sub-areas are not completely isolated from each other, and steam can move between different stirring sub-areas. Or, the stirring sub-areas are set as mutually independent and isolated spaces.

[0046] Compared with evaporating the liquid in the entire evaporator, the liquid is split and enters each stirring sub-area, reducing the total amount of liquid heated at one time, thereby reducing the possibility of the waste liquid boiling violently.

[0047] The stirring evaporation area can be fixedly installed inside the evaporator and fixedly connected to the inner wall of the evaporator.

[0048] Or, the stirring evaporation area can be movably installed inside the evaporator and can move inside the evaporator.

[0049] The moving mode of the stirring evaporation area inside the evaporator can be realized by setting a slide rail and a corresponding slider to achieve a sliding connection between the two, and driving the stirring evaporation area to move horizontally up and down or left and right by a motor arranged inside the evaporator.

[0050] In specific implementation, for example, the stirring sub-areas move up and down along the slide rail. First, the stirring sub-areas move up to one end of the slide rail. After rising to the highest point, then let the stirring sub-areas accelerate and slide down, and so on.

[0051] The stirrer regions can be kept moving uniformly through a shared slide rail, or respective corresponding slide rails and sliders can be set separately so that the stirrer regions have different movement routes.

[0052] For example, one of the stirrer regions moves up and down along the slide rail, and the adjacent stirrer region moves left and right along another slide rail.

[0053] Through the movement of the stirrer regions, a shaking effect is generated on the internal liquid, playing a role in stirring.

[0054] In addition, as Figure 7 shown, a moving plate 330 can also be provided at the bottom of the stirrer region. The moving plate is movably installed in the base 340 and can lift or lower at least one side of the moving plate. By way of example and not limitation, the implementation can be achieved by respectively providing matching slide rails and sliders at the connections between both sides of the moving plate and the base, and controlling the sliding directions of both sides through a controller so that both sides can displace in different directions.

[0055] After the liquid enters the stirrer region through the liquid inlet 311, the stirrer region is shaken by the moving plate. For example, when the left side of the moving plate is lifted and the right side correspondingly descends, the stirrer region above the moving plate can also rise on the left side and descend on the right side. When the left side of the moving plate is lowered again and the right side is lifted, the heights of both sides of the stirrer region also change accordingly. Or, the right side of the moving plate can be made to slide upwards while the left side remains in place. Or the left side of the moving plate can be made to slide downwards while the right side remains in place.

[0056] And so on. By repeatedly changing the height of at least one side of the moving plate, the stirrer region above can be shaken, and the internal liquid can be oscillated. Combining the above-mentioned vertical or horizontal movement modes of the stirrer regions can strengthen the shaking and stirring effect on the liquid in the stirrer region, thereby further preventing the occurrence of boiling phenomena during the heating process.

[0057] Furthermore, as Figures 2 - 5 shown, the wastewater of flame-retardant resin production containing toluene in the stirrer region 310 is stirred through the provided stirring structure.

[0058] The stirring structure includes a steam-driven propeller structure 320 provided at the steam outlet of the aforementioned evaporator.

[0059] Preferably, the propeller structure is provided at the steam outlet of the evaporator (not shown in the figure).

[0060] As Figure 2As shown, the propeller structure 320 is connected to the inner wall of the stirrer area through the fixed arm 324. The fixed arm and the central axis 323 are rotatably connected through the bearing 325.

[0061] As a typical implementation, the longitudinal axis of the fixed arm is parallel to the inner wall of the stirrer area, and the transverse axis is perpendicular to the inner wall of the stirrer area. The bearing is set to allow the fixed arm to rotate within the plane where its transverse axis is located.

[0062] The propeller structure includes an upper propeller 321 and a lower propeller 322 connected by a central axis. The upper propeller is located above the liquid surface, and the steam in the stirrer area 310 can be used as a power source to drive the upper propeller to rotate.

[0063] Optionally, as Figure 6 shown, the upper propeller 321 includes a blade seat 321-1, and a number of blades 321-2 are arranged at intervals on the blade seat.

[0064] A wind tunnel 321-3 is provided through the blade seat, and a gas pipeline 321-4 is provided corresponding to the wind tunnel. Steam is introduced into the wind tunnel through the gas pipeline. Optionally, an air suction component (not shown in the figure) is provided in the gas pipeline to suck the steam into the gas pipeline. When the steam converges in the gas pipeline and passes through the wind tunnel centrally, it can drive the blade seat to rotate.

[0065] The lower propeller is located below the liquid surface and is connected to the upper propeller through the central axis 323. When the upper propeller rotates, it drives the lower propeller to rotate through the central axis, thereby stirring the liquid.

[0066] In addition, the rotation of the upper propeller can also drive the steam flow in the stirrer area, and the steam flow can further drive the rotation of the upper propeller, thereby driving the rotation of the lower propeller, strengthening the stirring effect on the liquid, and thus forming a virtuous cycle in the stirrer area where the steam evaporated from the liquid is used as a power source to drive the propeller structure, and the propeller structure stirs the liquid under the push of the steam to assist the evaporation of the liquid.

[0067] And / or, the lower propeller and the central axis are connected by a gear set. The gear set can be a planetary gear set in the prior art. The planetary gear set enables the rotational speed of the lower propeller and

[0068] the upper propeller to be different. For example, when the upper propeller rotates two circles, it can drive the lower propeller to rotate three circles.

[0069] In addition to the above propeller structure, the stirring structure can also adopt other existing forms, such as an electric stirrer rod.

[0070] When the numerical ranges of the amount of liquid heated in the stir bar area and the amount of steam generated are relatively fixed, by configuring different planetary gear sets, more precise control of the stirring speed of the stirring structure can be achieved.

[0071] In another embodiment, as Figure 3 shown, raised portions 400 with inclined sides are symmetrically arranged on the inner wall of the stir bar area, and the upper propeller 321 is located between the raised portions; an upper positive V cavity with a V-shaped structure that is wider at the top and narrower at the bottom is formed around the upper propeller by the raised portions, and a lower inverted V cavity with an inverted V-shaped structure that is wider at the bottom and narrower at the top is formed above the lower propeller 322.

[0072] As Figure 3 shown, the raised portion has a triangular head structure. The liquid stirred by the lower propeller 322 generates rising steam, and the lower inverted V cavity that is wider at the bottom and narrower at the top has an effect of converging the incoming steam, so that the steam can converge and pass through the junction of the lower inverted V cavity and the upper positive V cavity, that is, the two triangular tips corresponding in the figure.

[0073] The upper propeller 321 is located in the upper positive V cavity, and optionally, is adjacent to the junction of the lower inverted V cavity and the upper positive V cavity. When the steam converged in the lower inverted V cavity enters the upper positive V cavity, it passes through the upper propeller centrally, and the upper propeller rotates under the impact force of the air flow and drives the lower propeller to rotate.

[0074] During the process of the steam rising in the upper positive V cavity, the temperature naturally drops, and part of the steam undergoes a phase change to become liquid. The two sides of the upper positive V cavity that are wider at the top and narrower at the bottom can guide the liquid to flow downward.

[0075] After passing through the junction of the lower inverted V cavity and the upper positive V cavity, it freely falls into the liquid below.

[0076] In another embodiment, as Figures 4 - 5 shown, a narrowed section 420 that converges is formed at the junction of the upper positive V cavity and the lower inverted V cavity.

[0077] Figure 4 In the raised portion has a trapezoidal structure. The upper bases of the trapezoidal raised portions that face each other together form the narrowed section. The width of the narrowed section is equal to the maximum width at the lower end of the upper positive V cavity and the minimum width at the upper end of the lower inverted V cavity.

[0078] The steam in the stir bar area enters the narrowed section through the lower inverted V cavity. The narrowed section has a certain length, so that after the steam enters the narrowed section centrally, it can move a certain distance, obtain buffering, and then enter the upper positive V cavity to generate an impact force on the upper propeller.

[0079] Figure 5The middle convex part adopts a triangular head structure with one end being arc-shaped. The arc shapes opposite to the convex part together form a narrow section. The width of the narrow section is smaller than the lower end width of the upper positive V cavity and the upper end width of the lower inverted V cavity.

[0080] In the narrow section that is narrower than the lower end width of the upper positive V cavity and the upper end width of the lower inverted V cavity, the confluent gas is further combined.

[0081] Of course, it is not limited to the above several shapes. The convex part can also adopt other shapes, such as rectangular, arc-shaped, and so on.

[0082] The present invention also provides a wastewater treatment method for a toluene wastewater treatment device used in the production of the above-mentioned flame-retardant resin. The method includes the following steps: inputting the toluene-containing wastewater from the production of flame-retardant resin into an evaporator; diverting and feeding the toluene-containing wastewater from the production of flame-retardant resin into several stirring sub-regions in a stirring evaporation region; and stirring the toluene-containing wastewater from the production of flame-retardant resin through the stirring structure in the stirring sub-region to evaporate the toluene-containing wastewater from the production of flame-retardant resin.

[0083] Within the scope of the target protection of the present disclosure, terms such as "including" should be construed as inclusive or open by default, rather than exclusive or closed, unless it is explicitly defined to have the opposite meaning. All technical, scientific, or other terms conform to the meanings understood by those skilled in the art, unless it is defined to have the opposite meaning. Common terms found in the dictionary should not be interpreted too idealistically or too unrealistically in the context of the relevant technical documents, unless the present disclosure clearly defines it as such.

[0084] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0085] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A toluene wastewater treatment device for flame retardant resin production, comprising a steam conveying device, characterized in that: It also includes an evaporator, in which a stirring evaporation zone is arranged, and the stirring evaporation zone includes a plurality of separately arranged stirring sub-zones, and toluene wastewater for flame retardant resin production is stirred by a stirring structure arranged in the stirring sub-zone; the stirring structure includes a steam-propelled propeller structure arranged at the steam outlet of the aforementioned evaporator; the stirring evaporation zone can move in the evaporator; a movable plate is arranged at the bottom of the stirring sub-zone, and the movable plate is movably installed in the base, and can lift or lower at least one side of the movable plate.

2. The toluene wastewater treatment equipment for the production of flame-retardant resin according to claim 1, characterized in that: The propeller structure comprises an upper propeller and a lower propeller connected by a central axis; wherein the upper propeller is located above the liquid surface and is configured to be driven to rotate by steam; and the lower propeller is located below the liquid surface.

3. The toluene wastewater treatment equipment for the production of flame-retardant resin according to claim 2, wherein: The propeller structure is connected to the inner wall of the stirring sub-area through a fixed arm; the fixed arm is rotatably connected to the central axis through a bearing, and when the upper propeller rotates, the lower propeller is driven to rotate through the central axis.

4. The toluene wastewater treatment equipment for the production of flame-retardant resin according to claim 2, wherein: The upper propeller includes a blade seat, on which a plurality of blades are arranged at intervals; a wind tunnel is arranged through the blade seat, and a gas pipeline is arranged corresponding to the wind tunnel, and steam is introduced into the wind tunnel through the gas pipeline; and / or, the lower propeller is connected to the central shaft through a gear set.

5. The toluene wastewater treatment equipment for the production of flame retardant resin according to claim 2, characterized in that: The inner wall of the stirring area is symmetrically provided with inclined protrusions on both sides, and the upper propeller is located between the protrusions; an upper positive V-cavity with a V-shaped structure that is wide at the top and narrow at the bottom is formed around the upper propeller through the protrusions, and a lower inverted V-cavity with an inverted V-shaped structure that is wide at the bottom and narrow at the top is formed above the lower propeller.

6. The toluene wastewater treatment equipment for flame-retardant resin production according to claim 5, characterized in that: A narrow section is formed at the junction of the upper positive V-cavity and the lower inverted V-cavity, and the width of the narrow section is less than or equal to the lower end width of the upper positive V-cavity and the upper end width of the lower inverted V-cavity; the steam in the stirring sub area enters the narrow section through the lower inverted V-cavity and reaches the upper positive V-cavity.

7. A wastewater treatment method for the toluene wastewater treatment equipment used in the production of flame retardant resin according to any one of claims 1-6, characterized in that, The method comprises the following steps: inputting flame retardant resin production wastewater containing toluene into an evaporator; sending the flame retardant resin production wastewater containing toluene into a plurality of stirring sub-areas in a stirring evaporation area; stirring the flame retardant resin production wastewater containing toluene by a stirring structure in the stirring sub-area to evaporate the flame retardant resin production wastewater containing toluene.

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