CN115521007A - Comprehensive purification and recovery process for wastewater generated in production of PPESK material - Google Patents

Comprehensive purification and recovery process for wastewater generated in production of PPESK material Download PDF

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CN115521007A
CN115521007A CN202210982421.3A CN202210982421A CN115521007A CN 115521007 A CN115521007 A CN 115521007A CN 202210982421 A CN202210982421 A CN 202210982421A CN 115521007 A CN115521007 A CN 115521007A
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condenser
pipe
evaporation
condensation
spiral
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CN115521007B (en
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王前
黄小芳
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Jiangsu Yuantuo Environmental Technology Co ltd
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Jiangsu Yuantuo Environmental Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0003—Condensation of vapours; Recovering volatile solvents by condensation by using heat-exchange surfaces for indirect contact between gases or vapours and the cooling medium
    • B01D5/0012—Vertical tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0033—Other features
    • B01D5/0036—Multiple-effect condensation; Fractional condensation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
    • B01D5/006—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with evaporation or distillation
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D3/00—Halides of sodium, potassium or alkali metals in general
    • C01D3/04—Chlorides
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
    • C07D333/02—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings
    • C07D333/46—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings substituted on the ring sulfur atom
    • C07D333/48—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings substituted on the ring sulfur atom by oxygen atoms
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/043—Details
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F2001/5218—Crystallization
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/12—Halogens or halogen-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/40—Organic compounds containing sulfur
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
    • C02F2103/38—Polymers

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  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
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  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
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Abstract

The utility model relates to a comprehensive purification recovery process of PPESK material waste water belongs to waste water purification technical field, its step includes concentrated saturation in proper order, the evaporation of separating out the potassium, sulfolane evaporation, centrifugation, primary condensation and secondary condensation, an evaporation concentration device for the concentrated saturation of material includes falling liquid film MVR evaporation concentration device and preheats the circulation subassembly, before the waste water material adds falling liquid film MVR evaporation concentration device, through preheating the circulation subassembly earlier, preheat the waste water material, be convenient for improve evaporation crystallization efficiency.

Description

Comprehensive purification and recovery process for PPESK material production wastewater
Technical Field
The application relates to the technical field of purification of production wastewater, in particular to a comprehensive purification and recovery process of PPESK material production wastewater.
Background
The PPESK is a resin-based carbon fiber reinforced composite material for manufacturing the bearing bush, and has good processability, and strong bearing capacity and supporting capacity. The high-speed thrust bearing is applied to an aeroengine and has the advantages of super wear resistance, self lubrication, long service life and the like.
In the related technology, production wastewater is generated after the PPESK material is produced, the production wastewater contains sulfolane, potassium chloride and other substances, and the production wastewater is usually directly discharged out of a PPESK material production system. But the substances with recycling value in the production wastewater are discharged, which causes resource waste.
Disclosure of Invention
In order to improve the problems, the application provides a comprehensive purification and recovery process of wastewater generated in the production of PPESK materials.
The comprehensive purification and recovery process for the PPESK material production wastewater adopts the following technical scheme:
the comprehensive purification and recovery process of the PPESK material production wastewater is characterized by sequentially comprising the following steps:
s1, concentration saturation: adding the wastewater material into an evaporation concentration device for concentration, and evaporating until potassium chloride is saturated to obtain saturated wastewater;
s2, potassium separation and evaporation: conveying the saturated wastewater to a potassium precipitation evaporation crystallization system, and evaporating and crystallizing to obtain potassium chloride and a crystallization liquid;
s3 sulfolane evaporation: conveying the crystallization liquid to a sulfolane evaporation system to form a solid-liquid mixed suspension and steam;
s31, centrifugation: conveying the solid-liquid mixed suspension to a centrifugal machine, centrifuging, and retaining the lower-layer precipitate to obtain potassium chloride solid;
s4, primary condensation: the steam enters a first-stage condenser, the condensing temperature is controlled to be 180-190 ℃, and sulfolane and condensed steam are obtained through condensation and separation;
s5, secondary condensation: and (4) conveying the condensed steam into a secondary condenser, controlling the condensation temperature to be 45-55 ℃, and condensing to form condensed water.
By adopting the technical scheme, the waste water material enters the potassium separating evaporation and crystallization system after being evaporated and concentrated, potassium chloride is crystallized, then the waste water material enters the sulfolane evaporation system, at the moment, the waste water material already forms a suspension liquid with solid-liquid mixing, the suspension liquid enters the centrifuge to separate potassium chloride solids, then steam enters the primary condenser, the separation of sulfolane is realized, finally, the residual steam enters the secondary condenser again to form condensed water, substances with utilization values in the production waste water are purified and recycled, the reutilization of resources is realized, and the waste is reduced.
Preferably, the evaporation concentration device in the step S1 comprises an evaporation chamber and a collecting tank, the evaporation chamber is communicated with the collecting tank, the collecting tank is connected with an inlet pipe, the inlet pipe is connected with a first circulating pump, the inlet pipe is provided with a feed inlet, the feed inlet is used for feeding materials, the first circulating pump is connected with a feed pipe, one end of the feed pipe, away from the first circulating pump, is communicated with the evaporation chamber, and a steam exhaust pipe is connected above the evaporation chamber.
Through adopting above-mentioned technical scheme, the waste water material enters into the inlet pipe through the feed inlet, and under the effect of first circulating pump, the waste water material enters into the evaporating chamber through the material loading pipe, heats the evaporation, and the crystal after the evaporation crystallization gets into the collection tank and deposits, and remaining solution continues to participate in the evaporation circulation, and remaining steam is then discharged through the exhaust pipe on the evaporating chamber.
Preferably, still include first condenser, the inlet pipe communicates with first condenser, first condenser and the one end intercommunication of keeping away from the evaporating chamber of material loading pipe.
Through adopting above-mentioned technical scheme, during the waste water material got into first condenser, heating steam in the first condenser preheats the waste water material, and the waste water material is behind first condenser, and the temperature progressively risees, and then when entering into the evaporating chamber through the material loading pipe, can make waste water material rapid heating up, improves the efficiency of evaporation crystallization, improves the extraction purity of the potassium chloride in the waste water material simultaneously, improves the effective utilization of the material of extracting.
Preferably, be equipped with spiral baffle in the first condenser, first condenser includes the material condenser pipe, spiral baffle cover is located on the material condenser pipe and a side surface of spiral baffle and the inner wall laminating of first condenser.
Through adopting above-mentioned technical scheme, under the inner wall of spiral baffle and first condenser was mutually supported, with separating into the space that the spiral descends in the first condenser, the heating steam that gets into in the first condenser can follow the even downstream in spiral baffle's the route that sets up under the effect of spiral baffle, can fully contact with the waste water material of each position in the material condenser pipe at the removal in-process, the even degree of being heated when improving waste water material and preheating, further improve waste water material medium substance purification efficiency.
Preferably, still include the second condenser, the second condenser is connected with the steam extraction pipe, be equipped with first condensation exit tube on the first condenser, the one end intercommunication of first condenser is kept away from with first condensation exit tube to the second condenser.
Through adopting above-mentioned technical scheme, heating steam in the first condenser preheats the waste water material in to the material condenser pipe, heating steam liquefies into the comdenstion water after exothermic, get into first condensation exit tube behind the comdenstion water discharge first condenser, then enter into the second condenser, first steam advances to manage and guides the second condenser with the interior exhaust heating steam of evaporating chamber in, through thermal exchange, make the comdenstion water temperature rise or partial vaporization become steam, improve thermal effective utilization.
Preferably, a second condensation outlet pipe is arranged on the second condenser, and one end, far away from the second condenser, of the second condensation outlet pipe is communicated with the first condenser.
Through adopting above-mentioned technical scheme, during vapour-liquid mixture after the temperature risees gets into first condenser through the backward flow of second condensation exit tube, utilize self heat to advance exothermic, heat the waste water material in the material condenser pipe, further improve the waste water material in the first condenser and preheat the even degree of being heated, improve thermal effective utilization, reduce the energy consumption.
Preferably, a spiral cavity is formed in the spiral partition plate, and the second condensation outlet pipe is communicated with the spiral cavity.
Through adopting above-mentioned technical scheme, from the steam-liquid mixture of exhaust in the second condenser, enter into the spiral cavity in the spiral baffle, follow the route of seting up of spiral cavity in the below of first material condenser pipe, upward move, mutually support with the heating steam in the first condenser, preheat the waste water material in the material condenser pipe, it is more abundant to make the waste water material that enters into in the first condenser preheat, improve the temperature when waste water material enters into the evaporating chamber, the evaporation concentration is realized fast to the waste water material in the evaporating chamber of being convenient for, improve the efficiency of purification separation operation, improve the extraction purity of material in the waste water material simultaneously, realize the recycle once more of resource.
Preferably, still include the second circulating pump, the second circulating pump communicates with the second condensate pipe, be connected with the back flow on the second circulating pump, the one end and the spiral cavity intercommunication of second circulating pump are kept away from to the back flow.
Through adopting above-mentioned technical scheme, from the interior exhaust vapour-liquid mixture of second condenser, get into the spiral cavity through the second condensation exit pipe in, first condenser of back discharge can be followed the spiral cavity and risen gradually to steam in the spiral cavity, but at this in-process, through endothermic comdenstion water can't remove along spiral cavity route by oneself, setting through the second circulating pump, can make vapour-liquid mixture remove along spiral cavity route in step, make the interior waste water material of material condenser pipe fully contact with vapour-liquid mixture, improve waste water material's the degree of preheating.
Preferably, a central material pipe is arranged in the first condenser, the central material pipe is communicated with the material condensation pipe, a central heating pipe is coaxially arranged outside the central material pipe, and the central heating pipe is fixedly connected with the spiral partition plate.
Through adopting above-mentioned technical scheme, center material pipe and material condenser pipe intercommunication, the waste water material passes through in the inlet pipe gets into center material pipe and material condenser pipe, after heating steam gets into first condenser, even downstream is sent along spiral baffle's route and central heating pipe simultaneously, make and be located the regional material condenser pipe in first condenser center and center material pipe all can realize the thermally equivalent, further realize the purification recovery efficiency of waste water material, the installation of the spiral baffle of also being convenient for of setting up of center material pipe simultaneously.
In summary, the present application includes at least one of the following beneficial technical effects:
1. by the arrangement of the spiral partition plate, the spiral partition plate is matched with the inner wall of the first condenser, the interior of the first condenser is divided into spiral descending spaces, heating steam entering the first condenser can uniformly move downwards along the arrangement path of the spiral partition plate under the action of the spiral partition plate, and can fully contact with wastewater materials at all positions in the material condenser pipe in the moving process, so that the heating uniformity degree of the wastewater materials during preheating is improved, and the substance purification efficiency of the wastewater materials is further improved;
2. through the setting of spiral cavity, from the steam-liquid mixture of exhaust in the second condenser, enter into the spiral cavity in the spiral baffle, follow the route of seting up of spiral cavity in the below of first material condenser pipe, upward move, mutually support with the heating steam in the first condenser, preheat the waste water material in the material condenser pipe, it is more abundant to make the waste water material that enters into in the first condenser preheat, improve the temperature when waste water material enters into the evaporating chamber, the evaporation concentration is realized fast to the waste water material in the evaporating chamber of being convenient for, improve the efficiency of purification separation operation, improve the extraction purity of material in the waste water material simultaneously, realize the recycle once more of resource.
Drawings
FIG. 1 is a flow chart of the comprehensive purification and recovery process of wastewater from the production of PPESK material in the present application.
Fig. 2 is a schematic diagram of the overall structure for embodying the falling film MVR evaporation concentration device and the preheating assembly in the embodiment of the present application.
Fig. 3 is a schematic diagram of an internal structure of a first condenser used in an embodiment of the present application.
FIG. 4 is a schematic diagram showing the positional relationship and connection relationship between the evaporation chamber and the collection tank in the embodiment of the present application.
Fig. 5 is a schematic structural diagram for showing a connection relationship between the first condenser and the second condenser in the embodiment of the present application.
Description of reference numerals: 1. a falling film MVR evaporation concentration device; 11. an evaporation chamber; 111. a material guide pipe; 112. a steam exhaust pipe; 12. a collection tank; 13. a first circulation pump; 14. a first feed tube; 141. a feed inlet; 15. a second feed pipe; 2. a preheat cycle assembly; 21. a first condenser; 211. a material condenser pipe; 2111. a central material tube; 212. a central heating tube; 213. a first steam inlet pipe; 214. a first condensation outlet pipe; 215. a first cavity; 216. heating the cavity; 217. a second cavity; 218. a first sealing plate; 219. a second sealing plate; 22. a second condenser; 221. a second steam inlet pipe; 222. a second condensation pipe; 223. a second circulation pump; 224. a return pipe; 3. feeding pipes; 4. a discharge pipe; 5. an internal circulation pump; 6. a spiral partition plate; 61. a helical cavity.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
The embodiment of the application discloses a comprehensive purification and recovery process of PPESK material production wastewater, as shown in figure 1, the wastewater material is added into an evaporation and concentration device for concentration, the temperature is controlled to be 95-105 ℃, and the evaporation is carried out until potassium chloride is saturated, so that saturated wastewater is obtained; conveying the saturated wastewater to a potassium separation evaporation crystallization system, heating by steam, controlling the temperature to be 105-115 ℃, and evaporating and crystallizing potassium chloride and crystallization liquid; conveying the crystallization liquid to a sulfolane evaporation system, heating heat conducting oil, and controlling the temperature to be 185-195 ℃ to form solid-liquid mixed suspension and steam; conveying the solid-liquid mixed suspension to a centrifugal machine, centrifuging, and retaining the lower-layer precipitate to obtain potassium chloride solid; the steam enters a first-stage condenser, the condensing temperature is controlled to be 180-190 ℃, and sulfolane and condensed steam are obtained through condensation and separation; and conveying the condensed steam into a secondary condenser, controlling the condensation temperature to be 45-55 ℃, and condensing to form condensed water.
As shown in fig. 2, the evaporation concentration device comprises a falling film MVR evaporation concentration device 1 and a preheating circulation component 2, the waste water material is preheated through the preheating circulation component 2 at first, and then enters the falling film MVR evaporation concentration device 1 to be evaporated and crystallized, and the waste water material is heated for many times through the preheating circulation component 2, so that the crystallization efficiency is improved.
As shown in fig. 2 and 3, the preheating circulation assembly 2 includes a first condenser 21, a first sealing plate 218, a second sealing plate 219 and a plurality of material condensation pipes 211 are disposed in the first condenser 21, and the first sealing plate 218 and the second sealing plate 219 are both fixedly connected to an inner wall of the first condenser 21 to divide the interior of the first condenser 21 into a first cavity 215, a heating cavity 216 and a second cavity 217. One end of the material condensation pipe 211 penetrates through the first sealing plate 218 to be communicated with the first cavity 215, the other end of the material condensation pipe 211 penetrates through the second sealing plate 219 to be communicated with the second cavity 217, and the side wall of the material condensation pipe 211 is fixedly connected with the first sealing plate 218 and the second sealing plate 219. The first condenser 21 is connected to a first steam inlet pipe 213 and a first condensation outlet pipe 214, and both the first steam inlet pipe 213 and the first condensation outlet pipe 214 are communicated with a heating cavity 216.
As shown in fig. 3, a spiral partition plate 6, a central material pipe 2111 and a central heating pipe 212 are arranged in the first condenser 21, the spiral partition plate 6 is located in the heating cavity 216, the side wall of the spiral partition plate is fixedly connected with the inner wall of the first condenser 21, the end of the central heating pipe 212 is fixedly connected with the spiral partition plate 6, the central material pipe 2111 is coaxially arranged in the central heating pipe 212, and the central material pipe 2111 is communicated with the first cavity 215 and the second cavity 217. After entering the heating cavity 216 through the first steam inlet pipe 213, the heating steam slowly descends in a spiral manner along the arrangement path of the central heating pipe 212 and the spiral partition plate 6 and releases heat, the heating steam after heat release becomes condensed water, and the condensed water is discharged out of the first condenser 21 through the first condensation outlet pipe 214.
As shown in fig. 2, 3 and 4, the falling film MVR evaporation and concentration device 1 includes a first circulation pump 13, an evaporation chamber 11 and a collection tank 12, wherein the evaporation chamber 11 is disposed above the collection tank 12 and is fixedly connected with the collection tank 12. The evaporation chamber 11 includes a material guide pipe 111, and the material guide pipe 111 extends into the collection tank 12. The collection tank 12 is fixedly connected with a first feeding pipe 14, the first feeding pipe 14 is provided with a feeding hole 141, and the wastewater material firstly enters the first feeding pipe 14 through the feeding hole 141 and then undergoes the following processes of evaporation concentration and crystallization. One end of the first feeding pipe 14, which is far away from the collecting tank 12, is fixedly connected with the first circulating pump 13, the first circulating pump 13 is further fixedly connected with a second feeding pipe 15, and the second feeding pipe 15 is far away from the first circulating pump 13, is connected to the first condenser 21, and is communicated with the first cavity 215. The first condenser 21 is further fixedly connected with a feeding pipe 3, one end of the feeding pipe 3 is communicated with the second cavity 217, and the other end is communicated with the evaporation chamber 11.
Waste water material passes through feed inlet 141, enters into first inlet pipe 14, under the effect of first circulating pump 13, waste water material enters into first cavity 215 of first condenser 21, then disperses to a plurality of material condenser pipes 211 in, at this moment, the waste water material of heating steam in to material condenser pipe 211 along spiral decline route heats, waste water material after the completion of preheating enters into second cavity 217 of first condenser 21 through material condenser pipe 211 and collects. Then enters the evaporation chamber 11 through the feeding pipe 3, and substances in the wastewater materials begin to crystallize and separate out under the high-temperature heating of the evaporation chamber 11. The solution mixed with the precipitated crystals enters the collecting tank 12 through the material guide pipe 111, the precipitated crystals are deposited at the bottom of the collecting tank 12, and part of the solution enters the first feed pipe 14 to continue to circulate and participate in the purification steps of evaporation concentration and crystallization.
As shown in fig. 3 and 5, the evaporation chamber 11 is further provided with a steam exhaust pipe 112, and the spiral partition plate 6 is provided with a spiral cavity 61. Preheating circulation subassembly 2 still includes second condenser 22 and second circulating pump 223, still is equipped with internal circulating pump 5 on the first condensation exit tube 214, and the one end and the second condenser 22 intercommunication of first condensation exit tube 214 are kept away from to internal circulating pump 5. The second condenser 22 is further provided with a second steam inlet pipe 221 and a second condensation outlet pipe 222, the second steam inlet pipe 221 is communicated with the steam exhaust pipe 112, the second condensation outlet pipe 222 is fixedly connected with a second circulating pump 223, the second circulating pump 223 is further provided with a return pipe 224, the return pipe 224 is communicated with the spiral cavity 61 in the first condenser 21 through the spiral cavity 61, and the other end of the spiral cavity 61 is connected with the discharge pipe 4.
The condensed water discharged from the first condenser 21 enters the second condenser through the first condensation outlet pipe 214, the steam with higher temperature in the evaporation chamber 11 is discharged from the evaporation chamber 11 through the steam outlet pipe 112, and then enters the second condenser 22 through the second steam inlet pipe 221 to exchange heat with the condensed water entering the second condenser 22, and then a steam-liquid mixture is formed. The vapor-liquid mixture is discharged through the second condensation pipe 222, and flows back to the spiral cavity 61 through the return pipe 224 under the action of the second circulation pump 223. The path is seted up along seting up to vapour-liquid mixture in spiral cavity 61, and spiral rising moves, mutually supports with the steam in heating cavity 216, and the waste water material that heats in the material condenser pipe 211 lasts even, and unnecessary mixture is discharged through the export.
The implementation principle of the comprehensive purification and recovery process of the PPESK material production wastewater in the embodiment of the application is as follows:
the waste water material enters the first feeding pipe 14 through the feeding port 141, enters the first cavity 215 of the first condenser 21 under the action of the first circulating pump 13, and then is dispersed into the plurality of material condensing pipes 211. In this process, advance pipe 213 through first steam to enter into the heating cavity 216 of first condenser 21 to the heating steam that waste water material preheats, because spiral baffle 6's setting, heating steam descends slowly along spiral route and releases heat, and waste water material absorption heat in the material condenser pipe 211 realizes preheating. The waste water material is converged in the second cavity 217, and enters the evaporation chamber 11 through the feeding pipe 3 for evaporation and concentration after being converged. After crystals are separated out, the mixed liquid of the wastewater materials enters the collecting tank 12 through the material guide pipe 111, the crystals are deposited at the bottom of the collecting tank 12, and the rest materials continue to enter the first feeding pipe 14 to participate in the circulation of evaporation concentration and crystallization. The heating steam in the first condenser 21 releases heat to form condensed water, the condensed water enters the second condenser 22 through the first condensation outlet pipe 214 and the second material inlet pipe, the steam with higher temperature in the evaporation chamber 11 enters the second condenser 22 through the steam exhaust pipe 112 and the second steam inlet pipe 221 to exchange heat with the condensed water again, and then a steam-liquid mixture is formed. The gas-liquid mixture flows back into the spiral cavity 61 through the second condensation pipe 222, the second circulation pump 223 and the backflow pipe 224, and slowly ascends along a spiral path in the spiral cavity 61. The vapour-liquid mixture cooperates with the heating steam, carries out abundant preheating to the waste water material in first condenser pipe, improves the extraction purity of the material in the waste water material, reduces the wasting of resources. Meanwhile, the steam resource is effectively utilized as much as possible, and the resource waste is further reduced.
The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (9)

1. The comprehensive purification and recovery process of the PPESK material production wastewater is characterized by sequentially comprising the following steps:
s1, concentration and saturation: adding the wastewater material into an evaporation concentration device for concentration, and evaporating until potassium chloride is saturated to obtain saturated wastewater;
s2, potassium separation and evaporation: conveying the saturated wastewater to a potassium separation evaporation crystallization system, and evaporating and crystallizing potassium chloride and crystallization liquid;
s3 sulfolane evaporation: conveying the crystallization liquid to a sulfolane evaporation system to form solid-liquid mixed suspension and steam;
s31, centrifugation: conveying the solid-liquid mixed suspension to a centrifugal machine, centrifuging, and retaining the lower-layer precipitate to obtain potassium chloride solid;
s4, primary condensation: the steam enters a first-stage condenser, the condensing temperature is controlled to be 180-190 ℃, and sulfolane and condensed steam are obtained through condensation and separation;
s5, secondary condensation: and conveying the condensed steam into a secondary condenser, controlling the condensation temperature to be 45-55 ℃, and condensing to form condensed water.
2. A comprehensive purification and recovery process of PPESK material production wastewater is characterized in that: the evaporation concentration device in the step S1 comprises an evaporation chamber (11) and a collection tank (12), the evaporation chamber (11) is communicated with the collection tank (12), the collection tank (12) is connected with a feeding pipe, the feeding pipe is connected with a first circulating pump (13), a feeding port (141) is formed in the feeding pipe, the feeding port (141) is used for feeding materials, the first circulating pump (13) is connected with a feeding pipe (3), one end, away from the first circulating pump (13), of the feeding pipe (3) is communicated with the evaporation chamber (11), and a steam exhaust pipe (112) is connected to the upper portion of the evaporation chamber (11).
3. An evaporative concentration apparatus as set forth in claim 2 wherein: still include first condenser (21), the inlet pipe communicates with first condenser (21), first condenser (21) and material loading pipe (3) are kept away from the one end intercommunication of evaporating chamber (11).
4. An evaporative concentration apparatus as set forth in claim 3 wherein: be equipped with spiral baffle (6) in first condenser (21), first condenser (21) are including material condenser pipe (211), spiral baffle (6) cover is located on material condenser pipe (211) and a side surface of spiral baffle (6) is laminated with the inner wall of first condenser (21).
5. An evaporative concentration apparatus as set forth in claim 3 wherein: still include second condenser (22), second condenser (22) are connected with exhaust pipe (112), be equipped with first condensation exit tube (214) on first condenser (21), the one end intercommunication of first condenser (21) is kept away from with first condensation exit tube (214) in second condenser (22).
6. An evaporative concentration apparatus as set forth in claim 5 wherein: be equipped with second condensation exit tube (222) on second condenser (22), the one end and the first condenser (21) intercommunication of second condenser (22) are kept away from to second condensation exit tube (222).
7. An evaporative concentration apparatus as set forth in claim 6 wherein: a spiral cavity (61) is formed in the spiral partition plate (6), and the second condensation pipe (222) is communicated with the spiral cavity (61).
8. An evaporative concentration apparatus as set forth in claim 7, wherein: the condenser is characterized by further comprising a second circulating pump (223), the second circulating pump (223) is communicated with a second condensation pipe (222), a return pipe (224) is connected to the second circulating pump (223), and one end, far away from the second circulating pump (223), of the return pipe (224) is communicated with the spiral cavity (61).
9. An evaporative concentration apparatus as set forth in claim 4 wherein: the condenser is characterized in that a central material pipe (2111) is arranged in the first condenser (21), the central material pipe (2111) is communicated with the material condensing pipe (211), a central heating pipe (212) is coaxially arranged outside the central material pipe (2111), and the central heating pipe (212) is fixedly connected with the spiral partition plate (6).
CN202210982421.3A 2022-08-16 2022-08-16 Comprehensive purification and recovery process for PPESK material production wastewater Active CN115521007B (en)

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