Bromine recovery device in decabromodiphenyl ethane production

Abstract

The utility model discloses a bromine recovery device in decabromodiphenyl ethane production, which comprises a distillation kettle, a condenser, a bromine-water separator, a pickling tower and a drying tower which are sequentially connected through pipelines, the pretreatment box is composed of an air inlet guide cylinder, a mechanical filter cylinder and an electrostatic filter cylinder which are sequentially connected through flanges, a primary filter screen and a secondary filter screen are installed in the mechanical filter cylinder, a support is installed in the electrostatic filter cylinder, and a plurality of dust collection electrode plates are evenly arranged on the support. And a plurality of corona electrode bars are arranged between the adjacent dust collection electrode plates. According to the utility model, the pretreatment box consisting of the air inlet guide cylinder, the mechanical filter cylinder and the electrostatic filter cylinder is used for filtering and removing particulate matters from bromine-containing waste gas before the bromine-containing waste gas enters the distillation kettle, so that subsequent equipment is protected, and the service life of the equipment in the whole bromine recovery system is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to decabromodiphenyl ethane production technical field especially a bromine recovery device in decabromodiphenyl ethane production. BACKGROUND

[0002] Decabromodiphenyl ethane is a bromide flame retardant, mainly is with diphenyl ethane and excessive bromine under the action of catalyst reaction preparation, the bromine in the reaction process because contains more impurities, cannot reuse to production, in order to reduce the waste of bromine, the existing technology designs the bromine recovery device.

[0003] The current bromine recovery device mainly through distillation kettle, condenser, bromine water separator, pickling tower and drying tower and so on a set of equipment operation, but, bromination reaction process will produce some from the reaction by-product, equipment corrosion product and the granules formed by the unreacted raw materials mixed in the bromine-containing waste gas, these with particulate matter bromine-containing waste gas directly into the recovery system, not only will cause the inside wall of distillation kettle or condenser scale, also will block the pickling tower mist in the nozzle or the packing layer, thereby shortening the service life of equipment.

[0004] Therefore, we propose a kind of bromine recovery device in decabromodiphenyl ethane production to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model is to provide a kind of bromine recovery device in decabromodiphenyl ethane production to solve the problems raised in the above background art.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A kind of bromine recovery device in decabromodiphenyl ethane production, including the distillation kettle, condenser, bromine water separator, pickling tower and drying tower connected by pipeline in sequence, the feed inlet of the distillation kettle is also connected with pretreatment box by pipeline, the pretreatment box is composed of air inlet guide cylinder, mechanical filter cartridge and electrostatic filter cartridge by flange connection in sequence, the inside of the mechanical filter cartridge is equipped with primary filter screen and secondary filter screen, the inside of the electrostatic filter cartridge is equipped with support, and the support is uniformly arranged with a plurality of dust collecting electrode plates, and a plurality of corona pole rods are arranged between adjacent dust collecting electrode plates.

[0008] In further embodiments, the air inlet guide cylinder adopts a horn-shaped structure, and a perforated plate is installed inside the air inlet guide cylinder.

[0009] In further embodiments, the side of the mechanical filter cartridge close to the air inlet guide cylinder is connected with dust collecting hopper one, the electrostatic filter cartridge is connected with dust collecting hopper two, and a flat valve is installed in the discharge section of the dust collecting hopper one and the dust collecting hopper two.

[0010] In further embodiments, an annular back-blowing air pipe is further installed on the outer wall of the mechanical filter cartridge, an external connector is connected to the outside of the annular back-blowing air pipe, and a plurality of spray heads are arranged along the circumference of the inner ring of the annular back-blowing air pipe, the spray heads are obliquely inserted into the mechanical filter cartridge, and the spray heads are directed towards the filtered side of the secondary filter screen.

[0011] In further embodiments, a vibration motor is further installed on the outer wall of the dust collecting hopper.

[0012] In further embodiments, a rotating rod is further installed inside the electrostatic filter cartridge, a rotating motor is installed outside the electrostatic filter cartridge to drive the rotating rod to rotate, a fixed ring is fixed to the outer wall of the rotating rod, and a knocking hammer is rotatably connected to the lower end of the fixed ring.

[0013] Compared with the prior art, the present application has the following advantages:

[0014] The present application is characterized in that a pretreatment box composed of an air inlet flow guide cylinder, a mechanical filter cartridge and an electrostatic filter cartridge is arranged to filter and remove particulate matter from the bromine-containing waste gas before it enters the distillation kettle, the mechanical filter cartridge is used to intercept larger particles, and the electrostatic filter cartridge is used to adsorb smaller particles, thereby effectively improving the particulate matter removal effect of the bromine-containing waste gas and protecting the subsequent equipment, which is conducive to prolonging the service life of the equipment in the entire bromine recovery system. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The figure is a structural schematic diagram of the present application;

[0016] Figure 2 The figure is a left front perspective structural schematic diagram of the pretreatment box of the present application;

[0017] Figure 3 The figure is a right rear perspective structural schematic diagram of the pretreatment box of the present application;

[0018] Figure 4 The figure is a cross-sectional structural schematic diagram of the mechanical filter cartridge of the present application;

[0019] Figure 5 The figure is an internal structural schematic diagram of the electrostatic filter cartridge of the present application.

[0020] In the figure: 1, distillation kettle; 2, condenser; 3, bromine water separator; 4, acid washing tower; 5, drying tower; 6, pretreatment box; 7, air inlet flow guide cylinder; 71, perforated plate; 8, mechanical filter cartridge; 81, primary filter screen; 82, secondary filter screen; 83, dust collecting hopper; 84, back-blowing air pipe; 85, external connector; 86, spray head; 9, electrostatic filter cartridge; 91, bracket; 92, dust collecting electrode plate; 93, corona electrode rod; 94, dust collecting hopper; 95, rotating rod; 96, fixed ring; 97, knocking hammer; 98, rotating motor; 10, flat valve; 11, vibration motor. DETAILED DESCRIPTION

[0021] In the description of the utility model, it needs to be understood that, the orientation or position relation indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0022] In the description of the utility model, it needs to be understood that, the terms "mounting", "connection" and "connection" should be understood in a broad sense, unless otherwise specified and limited, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0023] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary skilled persons in the art without creative labor belong to the scope of protection of the utility model.

[0024] Please refer to Figure 1 A bromine recovery device in decabromodiphenyl ethane production, including distillation kettle 1, condenser 2, bromine water separator 3, pickling tower 4 and drying tower 5 that pass through pipeline connection in proper order, the feed inlet of distillation kettle 1 still is connected with pretreatment box 6 through pipeline, in actual application, waste gas first enters pretreatment box 6 and removes particle, then enters distillation kettle 1 and distills, the bromine gas of distillation is transported to condenser 2 and is condensed into liquid bromine and bromine water, is transported to bromine water separator 3 and is separated initially, the separated liquid bromine is transported to pickling tower 4 and is pickled to remove chloride ion, then the material is transported to drying tower 5 and is dried to remove the remaining moisture, obtain pure bromine.

[0025] Please refer to Figures 2-5, in order to improve the particle removal effect of the pretreatment box 6, the pretreatment box 6 is composed of the gas inlet guide cylinder 7, the mechanical filter cylinder 8 and the electrostatic filter cylinder 9 connected by flanges in sequence, the inside of the mechanical filter cylinder 8 is provided with the primary filter screen 81 and the secondary filter screen 82, specifically, the primary filter screen 81 is located on the side of the gas inlet, so that the gas passes through the primary filter screen 81 first and then the secondary filter screen 82, the primary filter screen 81 can adopt a metal sintered filter element, and the secondary filter screen 82 can adopt a silicon carbide porous ceramic filter tube, the inside of the electrostatic filter cylinder 9 is provided with a bracket 91, a plurality of dust collecting electrode plates 92 are uniformly arranged on the bracket 91, a plurality of corona electrode rods 93 are arranged between adjacent dust collecting electrode plates 92, the top end of the corona electrode rod 93 is fixed to the top of the electrostatic filter cylinder 9, the corona electrode rod 93 is electrified to work, and a static electric field is generated between the dust collecting electrode plates 92, so that the particles in the passing waste gas carry electric charges and are adsorbed on the surface of the dust collecting electrode plates 92.

[0026] Further, the gas inlet guide cylinder 7 adopts a horn-shaped structure, and the inside of the gas inlet guide cylinder 7 is provided with a perforated plate 71, by arranging the gas inlet guide cylinder 7 with gradually increasing inner diameter and the perforated plate 71, uniform distribution of waste gas can be achieved, and secondary flying of particles caused by local high flow rate can be avoided.

[0027] Considering that the surfaces of the primary filter screen 81, the secondary filter screen 82 and the dust collecting electrode plates 92 will be covered with a large amount of dust particles after a long time of dust filtration in the mechanical filter cylinder 8 and the electrostatic filter cylinder 9, in order to ensure the subsequent particle removal effect, the dust needs to be cleaned, therefore, a dust collecting hopper one 83 is connected to the side of the mechanical filter cylinder 8 close to the gas inlet guide cylinder 7, a dust collecting hopper two 94 is connected to the lower part of the electrostatic filter cylinder 9, and a flat valve 10 is arranged in the discharge section of the dust collecting hopper one 83 and the dust collecting hopper two 94, so as to facilitate the discharge of residual dust particles in the mechanical filter cylinder 8 and the electrostatic filter cylinder 9 through the dust collecting hopper one 83 and the dust collecting hopper two 94.

[0028] Specifically, the outer wall of the mechanical filter cylinder 8 is further provided with an annular back-blowing air pipe 84, an external connector 85 is connected to the outside of the annular back-blowing air pipe 84, the external connector 85 is used to connect compressed nitrogen, a plurality of nozzles 86 are arranged along the circumference of the inner circle of the annular back-blowing air pipe 84, the nozzles 86 are obliquely inserted into the mechanical filter cylinder 8, and the nozzles 86 are directed to the outlet side of the secondary filter screen 82, so as to provide a gas source by using compressed nitrogen to realize back-blowing dust removal of the filter screen in the mechanical filter cylinder 8, and make the dust fall into the dust collecting hopper one 83.

[0029] At the same time, a vibration motor 11 is arranged on the outer wall of the dust collecting hopper one 83, so as to facilitate the screening of the dust on the dust collecting hopper one 83.

[0030] Specific, the inside of the electrostatic filter cylinder 9 is also installed with a rotating rod 95, and the electrostatic filter cylinder 9 is externally installed with a rotating motor 98 for driving the rotating rod 95 to rotate, the outer wall of the rotating rod 95 is fixed with a fixed ring 96, and the lower end of the fixed ring 96 is rotatably connected with a knocking hammer 97, the rotating rod 95 is rotated to drive the fixed ring 96 to rotate, so as to drive the knocking hammer 97 to knock the support 91, so as to shake off the dust particles attached to the dust collecting electrode plate 92, so as to fall into the dust collecting hopper two 94.

[0031] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to embrace all changes falling within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be considered as limiting the claims involved.

[0032] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains 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 combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A bromine recovery device for the production of decabromodiphenyl ethane, comprising a distillation kettle (1), a condenser (2), a bromine water separator (3), an acid washing tower (4), and a drying tower (5) connected in sequence by pipelines, characterized in that: The feed inlet of the distillation vessel (1) is also connected to a pretreatment box (6) via a pipe. The pretreatment box (6) consists of an air inlet guide tube (7), a mechanical filter tube (8), and an electrostatic filter tube (9) connected in sequence via flanges. The mechanical filter tube (8) is equipped with a primary filter screen (81) and a secondary filter screen (82). The electrostatic filter tube (9) is equipped with a support (91). Several dust collection electrode plates (92) are evenly arranged on the support (91), and several corona rods (93) are provided between adjacent dust collection electrode plates (92).

2. The bromine recovery device in the production of decabromodiphenyl ethane according to claim 1, characterized in that: The air intake guide tube (7) adopts a horn-shaped structure, and a perforated plate (71) is installed inside the air intake guide tube (7).

3. The bromine recovery device in the production of decabromodiphenyl ethane according to claim 1, characterized in that: The mechanical filter cylinder (8) is connected to a dust collection hopper one (83) on the side near the air inlet guide cylinder (7), and the electrostatic filter cylinder (9) is connected to a dust collection hopper two (94). The discharge sections of both dust collection hopper one (83) and dust collection hopper two (94) are equipped with flat plate valves (10).

4. The bromine recovery device in the production of decabromodiphenyl ethane according to claim 1, characterized in that: An annular backflush pipe (84) is also installed on the outer wall of the mechanical filter cylinder (8). The backflush pipe (84) is connected to an external connector (85). The inner ring of the annular backflush pipe (84) is provided with several nozzles (86) along the circumference. The nozzles (86) are inserted into the mechanical filter cylinder (8) at an angle and face the filter outlet side of the secondary filter screen (82).

5. The bromine recovery device in the production of decabromodiphenyl ethane according to claim 3, characterized in that: A vibration motor (11) is also installed on the outer wall of the dust collection hopper (83).

6. The bromine recovery device in the production of decabromodiphenyl ethane according to claim 1, characterized in that: The electrostatic filter cylinder (9) is also equipped with a rotating rod (95) inside, and a rotary motor (98) that drives the rotating rod (95) to rotate is installed outside the electrostatic filter cylinder (9). A fixing ring (96) is fixed on the outer wall of the rotating rod (95), and a hammer (97) is rotatably connected to the lower end of the fixing ring (96).

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