CN216549855U - Shearing filtration formula p hydroxybenzoic acid production sewage treatment plant - Google Patents

Abstract

The utility model discloses a shear filtration type p-hydroxybenzoic acid production sewage treatment device, which comprises a circulation separation device provided with a circulation separation cavity of a rotating shaft, wherein the circulation separation cavity is isolated into a primary filter chamber, a fine filter chamber and a water passing chamber through a coarse filter clapboard and a fine filter clapboard; the fine filter partition plate is provided with arc fine filter grooves which are distributed in a circumferential array mode and take the conical material sweeping barrel as the center, and the second material sweeping plate is provided with a second material sweeping plate feeding groove which is in a linear structure and takes the conical material sweeping barrel as the center and is distributed in a circumferential array mode. Has the advantage of pretreating the mother liquor and solves the problems of low sewage treatment efficiency and resource waste.

Description

Shearing filtration formula p hydroxybenzoic acid production sewage treatment plant

Technical Field

The application relates to the technical field of phenolic wastewater treatment equipment, in particular to a shearing and filtering type p-hydroxybenzoic acid production sewage treatment device.

Background

P-hydroxybenzoic acid, PHBA, is an important organic synthetic material, and due to its unique hydroxyl and carboxyl functional groups, it is one of the most widely used materials in organic chemical raw materials, and is widely used in the fields of medicine, pesticide, food, electronic communication, polymer material industry, etc. In recent years, PHBA is in great demand in domestic and foreign markets. Compared with foreign technologies, the PHBA production process in China is relatively laggard, the operation is complex, the yield is low, the energy consumption is high, and the wastewater production capacity is high. In addition, with the continuous development of society, the demand of related downstream industries on high-purity, low-chroma and high-stability PHBA is increasing. In order to solve the problem of neck clamping in the field of liquid crystal high-molecular materials in China, breakthrough is realized in the direction of high-end electronic chemicals, and the development of a PHBA high-efficiency green synthesis technology becomes an important research content of the PHBA industry in China under the large background of innovation and upgrade and green transformation of the manufacturing industry.

Currently, the PHBA production processes widely adopted in domestic and foreign industries mainly comprise the following three processes:

1. salicylic acid is used as a raw material, is converted into potassium salt by potassium hydroxide, is converted at high temperature in the presence of potassium carbonate, and is acidified to prepare PHBA. Although the process is mature, the salicylic acid is synthesized by carboxylation and then converted into PHBA. The indirect synthesis production method has the advantages of longer production process flow, low yield and high cost.

2. Potassium phenolate or sodium phenolate is used as a raw material, and is subjected to carboxylation reaction with carbon monoxide under the action of formate and under the pressure of 5.88 MPa and at high temperature, so that the PHBA with high yield is obtained. Although the yield of this route is high, the required pressure is high, and therefore the equipment requirements are extremely high. In addition, the process requires continuous production of carbon monoxide gas for carboxylation reaction, and thus the production has a high difficulty.

3. The Kolbe-Schmitt synthesis method is utilized, firstly, phenol and potassium hydroxide are prepared into potassium phenoxide, then the potassium phenoxide is used as a raw material to perform a carboxylation reaction with carbon dioxide in a certain medium under the pressure of 0.49-0.88MPa and the high temperature of 150 ℃ plus 270 ℃, and then the crude product PHBA is obtained by hydrochloric acid precipitation, filtration and drying. The production method has lower reaction pressure, and the used carbon dioxide, potassium hydroxide and phenol have rich sources, thereby being easy to realize industrialization. However, the process is operated intermittently, and the yield is low. In addition, a large amount of waste gas, waste water and solid waste are generated in the process reaction and intermediate treatment process, particularly the generated phenol-containing waste water is difficult to treat, is not beneficial to environmental protection, and simultaneously influences the economic benefit to a certain extent.

The existing sewage generated by PHBA treatment is treated by conveying mother liquor (containing recyclable solid substances) and washing water to corresponding sewage treatment equipment together, so that the waste water treatment efficiency is low and resources are wasted.

SUMMERY OF THE UTILITY MODEL

The utility model provides a shear filtration type p-hydroxybenzoic acid production sewage treatment device for pretreating mother liquor, which solves the problems of low treatment efficiency and resource waste of the existing method.

The technical problem is solved by the following technical scheme: a shearing and filtering type p-hydroxybenzoic acid production sewage treatment device comprises a mother liquid pool and a washing pool, wherein a circulation separation device is arranged between the mother liquid pool and the washing pool, the circulation separation device comprises a circulation separation cavity, a rotating shaft is arranged in the circulation separation cavity, the rotating shaft is connected with a driving motor, the circulation separation cavity is sequentially provided with a coarse filtration clapboard and a fine filtration clapboard from top to bottom, the coarse filtration clapboard and the fine filtration clapboard are isolated in the circulation separation cavity to form a primary filtration chamber, a fine filtration chamber and a water passing chamber which are sequentially distributed from top to bottom, the mother liquid pool is communicated with the coarse filtration chamber and the washing pool and communicated with the water passing chamber, the rotating shaft is sleeved with a first annular coarse filtration plate which is horizontally arranged on the upper side of the coarse filtration clapboard, the first coarse filtration plate is fixedly connected with the rotating shaft, the coarse filtration clapboard is provided with a plurality of long strip-shaped coarse filtration grooves, the coarse filtration grooves are distributed on the coarse filtration clapboard in a circular array taking a conical filtration cylinder as the center, the coarse filter tank is arc-shaped, the extension direction of the coarse filter tank is crossed with the circumference of the conical material sweeping cylinder, a plurality of strip-shaped first scanning plate part feeding grooves are arranged on the first scanning plates, the first scanning plate part feeding grooves are straight grooves extending along the radial direction of the conical material sweeping cylinder, and the first scanning plate part feeding grooves are distributed on the coarse filter partition plate in a circumferential array with the conical material sweeping cylinder as the center; the cover is equipped with the annular second of putting the side of carefully straining the baffle in the pivot and sweeps the flitch, and the flitch is swept with the pivot rigid coupling together to the second, be equipped with the thin filter tank of a plurality of rectangular shapes on the coarse filtration baffle, the circumference array distribution that the feed cylinder was the center is swept to the toper to the thin filter tank on the coarse filtration baffle, and the thin filter tank is the arc, and the extending direction of thin filter tank is swept the circumference alternately of feed cylinder with the toper, and the second that is equipped with a plurality of rectangular shapes on the second sweeps the feed cylinder on the material board and is swept material board feed chute, and the straight flute that the feed cylinder radially extended is swept to the toper is swept to the second, and the second is swept material board feed chute and is swept the circumference array distribution that the feed cylinder was the center on the fine filtration baffle with the toper.

According to the technical scheme, the mother liquor flows into the washing water tank after being subjected to solid-liquid separation, and then is conveyed away together for treatment, the mother liquor is pretreated, solid matters in the mother liquor can be separated out for recycling, resources are saved, the solid matter content in the subsequently-treated wastewater is low, and the discharging efficiency can be improved. And the coarse separation and the fine separation are carried out, so that the solid wastes with different diameters are filtered and concentrated, and the solid wastes can be conveniently discharged from the solid discharge holes of the corresponding chambers in a targeted manner. The sewage passing through the circulating separation device can directly enter a washing water tank for sewage treatment, so that the sewage treatment efficiency is improved; can accomplish the separately processing of the solid residue of phenol-containing waste water and waste water in the PDBA production process through this application, accomplish the solid residue of different particle diameters respectively and clear away, compare traditional centrifuge, the toper is swept the feed cylinder and is joined in marriage centrifugal cylinder and not only can play centrifugal separation's effect to the filterable benefit of layering, the treatment effeciency of the phenol-containing waste water of improvement PHBA production that can be very big. According to the technical scheme, when the coarse filter tank and the feeding chute of the first scanning plate part are crossed, the coarse filter holes of the grooves at the overlapped parts are formed, so that the coarse filter holes are dynamically moved, the rotation of the first scanning plate can drive the shearing action of solids just positioned in the coarse filter holes, and the blockage of the coarse filter holes is not easily caused. The same is true of the placement of the fine filtration pores.

Preferably, the rear end of the first scanning plate part feeding groove along the rotation direction of the conical scanning barrel is provided with a first scanning plate part vertical pushing plate extending along the extension direction of the first scanning plate part feeding groove, and two ends of the first scanning plate part vertical pushing plate in the horizontal direction exceed two ends of the first scanning plate part feeding groove; the second is swept the flitch feed chute and is swept the rear end of feed chute rotation direction along the toper and be equipped with along the second and sweep the flitch vertical push pedal of flitch extending of flitch feed chute extending direction, and the second is swept the flitch and is erected the both ends of push pedal horizontal direction and surpass the both ends that the flitch feed chute was swept to the second. When the feeding groove device is used, the pressure of the upper end of the feeding groove, namely the feeding end, can be improved, and therefore materials at the upper end can pass through more smoothly.

Preferably, a conical sweeping material cylinder with a closed upper end and a closed lower end is arranged in the circulating separation cavity and sleeved on the rotating shaft, the upper end of the conical sweeping material cylinder is small, the lower end of the conical sweeping material cylinder is large, the lower end of the conical sweeping material cylinder is in butt joint with a centrifugal cylinder with a closed upper end and a closed lower end, the circulating separation cavity is divided into an inner cavity and an outer cavity by the centrifugal cylinder and the conical sweeping material cylinder, a rough filtering partition plate and a fine filtering partition plate are positioned in the outer cavity, a part of the conical sweeping material cylinder, which corresponds to the water passing chamber, is provided with water passing holes communicated with the inner chamber, the inner chamber is communicated with a washing water tank, and the rotating shaft is connected with a centrifugal blade which is aligned with the water passing holes. Can drive the backflushing function to the water passing chamber.

Preferably, the centrifugal blade is arranged at the middle height position corresponding to the water through hole, and the water through hole is in a long strip shape extending along the direction of the generatrix of the conical sweeping cylinder. The upper end and the lower end of the centrifugal blade are respectively provided with a water inlet end and a water outlet end, and the centrifugal blade corresponds to the middle height of the water passing layer, so that the centrifugal blade can form small circulation corresponding to the water passing layer, and even part of liquid can backflush the fine filter tank, thereby improving the anti-blocking capacity of the fine filter tank.

Preferably, a filter screen is arranged in the inner chamber, the inner chamber is isolated into an upper chamber and a lower chamber by the filter screen, the water passing hole is located in the lower chamber, and the washing water tank is communicated with the upper chamber. The solid-liquid separation effect can be further improved, so that the content of solid matters output into the washing tank is small, the filter screen is arranged in an upper output mode, the filter screen at the upper end is not easy to block, and the solid matters after filtering can be centrifuged to the concentrated solution chamber by the centrifugal cylinder.

Preferably, a liquid flow output channel axially extending along the inner spindle head is arranged in the rotating shaft, a liquid inlet communicated with the upper cavity and the liquid flow output channel is arranged at the part of the rotating shaft positioned in the upper cavity, the lower end of the liquid flow output channel penetrates through the lower end face of the rotating shaft to form a liquid outlet, and the washing water tank is communicated with the liquid outlet. The lower ends of the fine filtering chamber and the water passing chamber are provided with discharge holes. Layout output can be conveniently carried out, and different rotating parts interfere, and the structure is compact.

Preferably, an upper return pipeline is arranged between the coarse filtration chamber and the fine filtration chamber, and two ends of the upper return pipeline are respectively connected to the upper end of the coarse filtration chamber and the upper end of the fine filtration chamber; and a lower backflow pipeline is arranged between the fine filtering chamber and the water passing chamber, and two ends of the lower backflow pipeline are respectively connected to the upper end of the fine filtering chamber and the upper end of the water passing chamber. The arrangement of the backflow pipeline can realize multiple times of circulating filtration of wastewater, the backflow pipeline is arranged at the upper ends of the coarse filter layer and the fine filter layer, solid impurities are less accumulated, and the reliability of the circulating filtration effect is ensured. The drive power of backward flow effect is for sweeping the feed cylinder centrifugal drive effect under and producing at the toper, need not to set up the power supply in addition, can put up the pressure differential of high coarse filtration baffle and fine filtration baffle business turn over side, and the upper end filters more high-efficiently.

Preferably, the lower ends of the primary filtering chamber, the fine filtering chamber and the water passing chamber are provided with sewage draining holes. The solid matter can be easily discharged.

The utility model has the following beneficial effects: the device can be used for finishing the separate treatment of the solid residue of the phenolic wastewater and the wastewater in the production process of PDBA, coarse filtration, fine filtration and centrifugal separation, and finishing the removal of the solid residue with different particle diameters respectively; the filtering holes of the filtering mechanism are dynamically changed and have the shearing and anti-blocking functions.

Drawings

FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;

FIG. 2 is a schematic top view of a first scan plate and an ejection baffle;

fig. 3 is a schematic structural diagram of a second embodiment of the present invention.

In the figure: the device comprises a mother liquor pool 1, a washing pool 2, a circulating separation cavity 3, a conical scavenging barrel 4, a rough filtering partition plate 6, a fine filtering partition plate 7, a partition plate 8, a primary filtering chamber 9, a fine filtering chamber 10, a water passing chamber 11, a discharge hole 13, a water passing hole 14, a motor 17, a filtering net 18, an upper cavity 19, a lower cavity 20, a liquid flow output channel 22, a liquid inlet 23, a liquid outlet 24, a first scanning plate 25, a second scavenging plate 26, a rough filtering groove 27, a fine filtering groove 28, centrifugal blades 29, a rotating shaft 31, an upper return pipeline 35, a lower return pipeline 36, a first scanning plate part feeding groove 37, a second scavenging plate part feeding groove 38, a first scanning plate part vertical push plate 39 and a second scavenging plate part vertical push plate 40.

Detailed Description

The utility model is further illustrated with reference to the figures and the specific embodiments.

In the first embodiment, referring to fig. 1 and 2, a PHBA production wastewater treatment system with dynamically arranged filter holes comprises a mother liquor pool 1 and a washing pool 2, and a circulating separation device is arranged between the mother liquor pool and the washing pool. The circulation and separation means comprise a circulation and separation chamber 3. A rotating shaft 31 is rotatably connected in the separation cavity. The rotating shaft is vertically arranged, and the upper end of the rotating shaft is connected with the motor 17. A coarse filtering clapboard 6 and a fine filtering clapboard 7 are sequentially arranged in the circulating separation cavity from top to bottom. The filtering baffle plate and the fine filtering baffle plate are separated into a primary filtering chamber 9, a fine filtering chamber 10 and a water passing chamber 11 which are sequentially distributed from top to bottom in the circulating separation cavity. The lower ends of the primary filtering chamber, the fine filtering chamber and the water passing chamber are provided with discharge holes 13. The rotating shaft is provided with a first scanning plate 25 which is horizontally arranged and attached to the upper side of the primary filtering plate and a second scanning plate 26 which is horizontally arranged and attached to the upper side of the fine filtering partition plate, the coarse filtering partition plate is provided with a plurality of strip-shaped coarse filtering grooves 27, and the coarse filtering grooves are distributed on the coarse filtering partition plate in a circumferential array mode with the conical material sweeping barrel as the center. The coarse filter tank is arc-shaped, the extending direction of the coarse filter tank is crossed with the circumferential direction of the conical material sweeping cylinder, a plurality of strip-shaped first-scanner-part feeding grooves 37 are arranged on the first scanners, the first-scanner-part feeding grooves are straight grooves extending along the radial direction of the conical material sweeping cylinder, and the first-scanner-part feeding grooves are distributed on the coarse filter partition plate in a circumferential array mode by taking the conical material sweeping cylinder as the center. The fine filter partition plate is provided with a plurality of strip-shaped fine filter grooves 28 which are distributed on the fine filter partition plate in a circumferential array with the conical material sweeping barrel as the center. The thin filter cell is arc-shaped, the extending direction of the thin filter cell is crossed with the circumferential direction of the conical material sweeping cylinder, a plurality of strip-shaped second material sweeping plate part feeding grooves 38 are arranged on the second material sweeping plate, the second material sweeping plate part feeding grooves are straight grooves extending along the radial direction of the conical material sweeping cylinder, and the second material sweeping plate part feeding grooves are distributed on the thin filter partition plate in a circumferential array mode by taking the conical material sweeping cylinder as the center. The rear end of the first scanning plate part feeding groove along the rotating direction of the conical scanning cylinder is provided with a first scanning plate part vertical push plate 39 extending along the extending direction of the first scanning plate part feeding groove, and two ends of the first scanning plate part vertical push plate in the horizontal direction exceed two ends of the first scanning plate part feeding groove; the second is swept the flitch feed chute and is swept the rear end of feed chute rotation direction along the toper and be equipped with along the second and sweep flitch portion vertical push pedal 40 that flitch portion feed chute extending direction was stretched, and the second is swept the flitch portion and is erected the both ends of push pedal horizontal direction and surpass the both ends that the flitch feed chute was swept to the second. The mother liquid pool is communicated with the rough filtering chamber and is provided with a valve control. The washing water tank is communicated with the water passing chamber and is provided with a valve control.

The second embodiment is different from the first embodiment in that:

referring to fig. 3, a conical material sweeping cylinder 4 with a closed upper end and an open lower end is sleeved on the rotating shaft, the upper end of the conical material sweeping cylinder is small, the lower end of the conical material sweeping cylinder is large, and the circulating separation cavity is divided into an inner cavity and an outer cavity by the conical material sweeping cylinder. The coarse filter plate and the fine filter plate are positioned in the outer cavity. The first material sweeping plate and the second material sweeping plate are connected to the outer peripheral surface of the conical material sweeping barrel. An upper return pipeline 35 is arranged between the coarse filtration chamber and the fine filtration chamber, and two ends of the upper return pipeline are respectively connected with the upper end of the coarse filtration chamber and the upper end of the fine filtration chamber; a lower return pipeline 36 is arranged between the fine filtering chamber and the water passing chamber, and two ends of the lower return pipeline are respectively connected with the upper end of the fine filtering chamber and the upper end of the water passing chamber. The part of the conical scavenging cylinder corresponding to the water passing chamber is provided with a water passing hole 14 communicated with the inner chamber, and the inner chamber is communicated with the washing water tank and is provided with a control valve. The water holes are long strips extending along the direction of the generatrix of the conical sweeping cylinder. The rotating shaft is connected with a centrifugal blade 29. The centrifugal blades are arranged at the middle height position corresponding to the water passing holes. A filter screen 18 is arranged in the inner chamber, the filter screen separates the inner chamber into an upper chamber 19 and a lower chamber 20, and the water passing hole is located in the lower chamber. The washing water pool is communicated with the upper cavity, and specifically: a liquid flow output channel 22 extending along the axial direction of the rotating shaft is arranged in the rotating shaft, a liquid inlet 23 communicated with the liquid flow output channel is arranged at the part of the rotating shaft head in the upper cavity, a liquid outlet 24 is formed by the lower end of the liquid flow output channel penetrating through the lower end face of the rotating shaft, and the washing water tank is communicated with the liquid outlet.

Claims (8)

1. A shear filtration formula p hydroxybenzoic acid production sewage treatment plant, its characterized in that is equipped with circulation separator between mother liquor pond and the wash tank, and circulation separator includes the circulation separation chamber, be equipped with the pivot in the circulation separation chamber, the pivot links together with driving motor, and the circulation separation chamber is equipped with coarse filter baffle and fine filter baffle from the top down in proper order, and coarse filter baffle and fine filter baffle keep apart the primary filter chamber, fine filter chamber and the water passing room that distribute in proper order from the top down in the circulation separation chamber, and the mother liquor pond communicates the wash tank with the coarse filter chamber and communicates with the water passing room, and the cover is equipped with the annular first scanning board of putting horizontally on the coarse filter baffle upside in the pivot, and first scanning board is in the same place with the pivot rigid coupling, be equipped with the coarse filter tank of a plurality of the rectangular shape of dry road on the coarse filter baffle, coarse filter tank uses the circumference array distribution of toper material sweeping barrel as the center on the coarse filter baffle, the coarse filter tank is arc-shaped, the extension direction of the coarse filter tank is crossed with the circumference of the conical material sweeping cylinder, a plurality of strip-shaped first scanning plate part feeding grooves are arranged on the first scanning plates, the first scanning plate part feeding grooves are straight grooves extending along the radial direction of the conical material sweeping cylinder, and the first scanning plate part feeding grooves are distributed on the coarse filter partition plate in a circumferential array with the conical material sweeping cylinder as the center; the cover is equipped with the annular second of putting flat at the thin partition board upside in the pivot and sweeps the flitch, and the flitch is swept to the second and the pivot rigid coupling is in the same place, be equipped with the thin filter tank of a plurality of rectangular shapes on the thin partition board of straining, the thin filter tank uses the toper to sweep the circumference array distribution that the feed cylinder was the center on the coarse filter partition board, and the thin filter tank is the arc, and the extending direction of thin filter tank is crossed with the circumference that the feed cylinder was swept to the toper, and the second is swept the second that is equipped with a plurality of rectangular shapes on the flitch and is swept the flitch feed chute of material, and the straight flute that the feed cylinder radially extended is swept to the toper is swept to the second, and the second is swept flitch feed chute and is swept the toper and is swept the circumference array distribution that the feed cylinder is the center on the thin partition board of straining.

2. The shear-filtration type p-hydroxybenzoic acid production wastewater treatment device according to claim 1, wherein the rear end of the first scanning plate part feed chute in the rotation direction of the tapered scanning barrel is provided with a first scanning plate part vertical push plate extending in the extension direction of the first scanning plate part feed chute, and the two ends of the first scanning plate part vertical push plate in the horizontal direction exceed the two ends of the first scanning plate part feed chute; the second is swept the flitch feed chute and is swept the rear end of feed chute rotation direction along the toper and be equipped with along the second and sweep the flitch vertical push pedal of flitch extending of flitch feed chute extending direction, and the second is swept the flitch and is erected the both ends of push pedal horizontal direction and surpass the both ends that the flitch feed chute was swept to the second.

3. The shear filtration type p-hydroxybenzoic acid production wastewater treatment device according to claim 1, wherein a conical sweeping cylinder with a closed upper end and a closed lower end and arranged on the rotating shaft is arranged in the circulation separation chamber, the conical sweeping cylinder has a small upper end and a large lower end, the lower end of the conical sweeping cylinder is connected with a centrifugal cylinder with a closed upper end and a closed lower end, the circulation separation chamber is divided into an inner chamber and an outer chamber by the centrifugal cylinder and the conical sweeping cylinder, the coarse filtration partition plate and the fine filtration partition plate are arranged in the outer chamber, a part of the conical sweeping cylinder corresponding to the water passing chamber is provided with a water passing hole communicated with the inner chamber, the inner chamber is communicated with the washing water tank, and the rotating shaft is connected with a centrifugal blade aligned with the water passing hole.

4. The shear filtration type p-hydroxybenzoic acid production wastewater treatment device according to claim 3, wherein the centrifugal blade is disposed at an intermediate height position corresponding to the water through hole, and the water through hole is a long strip extending in the direction of the generatrix of the tapered scavenging cylinder.

5. The shear filtration type p-hydroxybenzoic acid production sewage treatment plant according to claim 3 or 4, wherein a filter screen is arranged in the inner chamber, the filter screen separates the inner chamber into an upper chamber and a lower chamber, the water through hole is located in the lower chamber, and the washing water tank is communicated with the upper chamber.

6. The shear filtration type p-hydroxybenzoic acid production wastewater treatment device according to claim 5, wherein a liquid flow output channel axially extending along the inner shaft head is arranged in the rotating shaft, a liquid inlet communicating the upper chamber with the liquid flow output channel is arranged in the part of the rotating shaft located in the upper chamber, a liquid outlet is formed at the lower end of the liquid flow output channel and penetrates through the lower end face of the rotating shaft, and the washing water tank is communicated with the liquid outlet.

7. The shear filtration type p-hydroxybenzoic acid production wastewater treatment device according to claim 3 or 4, wherein an upper return pipeline is arranged between the coarse filtration chamber and the fine filtration chamber, and two ends of the upper return pipeline are respectively connected to the upper end of the coarse filtration chamber and the upper end of the fine filtration chamber; and a lower backflow pipeline is arranged between the fine filtering chamber and the water passing chamber, and two ends of the lower backflow pipeline are respectively connected to the upper end of the fine filtering chamber and the upper end of the water passing chamber.

8. The shear filtration type p-hydroxybenzoic acid production wastewater treatment device according to claim 1, wherein the lower ends of the primary filtration chamber, the fine filtration chamber and the water passing chamber are provided with discharge holes.

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