CN114790058A - Process and device for discharging and treating purified terephthalic acid refining wastewater - Google Patents
Process and device for discharging and treating purified terephthalic acid refining wastewater Download PDFInfo
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- CN114790058A CN114790058A CN202110095507.XA CN202110095507A CN114790058A CN 114790058 A CN114790058 A CN 114790058A CN 202110095507 A CN202110095507 A CN 202110095507A CN 114790058 A CN114790058 A CN 114790058A
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- terephthalic acid
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- purified terephthalic
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- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 239000002351 wastewater Substances 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000008569 process Effects 0.000 title claims abstract description 38
- 238000007670 refining Methods 0.000 title claims abstract description 21
- 238000007599 discharging Methods 0.000 title abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000011084 recovery Methods 0.000 claims abstract description 42
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 33
- 238000007872 degassing Methods 0.000 claims abstract description 21
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 20
- 239000002918 waste heat Substances 0.000 claims abstract description 20
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 16
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000011572 manganese Substances 0.000 claims abstract description 12
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical group [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 10
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 10
- 239000003456 ion exchange resin Substances 0.000 claims abstract description 10
- 229920003303 ion-exchange polymer Polymers 0.000 claims abstract description 10
- 229910001415 sodium ion Inorganic materials 0.000 claims abstract description 10
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 7
- 239000010941 cobalt Substances 0.000 claims abstract description 7
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910021645 metal ion Inorganic materials 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 34
- 238000013519 translation Methods 0.000 claims description 22
- 238000001704 evaporation Methods 0.000 claims description 16
- 230000008020 evaporation Effects 0.000 claims description 16
- 208000028659 discharge Diseases 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 11
- 239000013505 freshwater Substances 0.000 claims description 9
- 239000012528 membrane Substances 0.000 claims description 9
- 238000002425 crystallisation Methods 0.000 claims description 8
- 230000008025 crystallization Effects 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims 2
- 238000000746 purification Methods 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 7
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 32
- 239000002245 particle Substances 0.000 description 20
- 239000002910 solid waste Substances 0.000 description 20
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 19
- 229910010271 silicon carbide Inorganic materials 0.000 description 19
- 239000002253 acid Substances 0.000 description 17
- 238000001179 sorption measurement Methods 0.000 description 17
- 238000001514 detection method Methods 0.000 description 9
- 238000001914 filtration Methods 0.000 description 9
- 229910001429 cobalt ion Inorganic materials 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- XLJKHNWPARRRJB-UHFFFAOYSA-N cobalt(2+) Chemical compound [Co+2] XLJKHNWPARRRJB-UHFFFAOYSA-N 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 229910001437 manganese ion Inorganic materials 0.000 description 5
- 238000004064 recycling Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- MZZUATUOLXMCEY-UHFFFAOYSA-N cobalt manganese Chemical compound [Mn].[Co] MZZUATUOLXMCEY-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012452 mother liquor Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
-
- 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
- C02F1/048—Purification of waste water by 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
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- 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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- 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
- C02F1/22—Treatment of water, waste water, or sewage by freezing
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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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
- 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
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- Oil, Petroleum & Natural Gas (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the technical field of auxiliary wastewater treatment devices, in particular to a process and a device for treating the emission of refined terephthalic acid wastewater, which are beneficial to realizing zero emission of wastewater; the process for discharging and treating purified terephthalic acid refined wastewater comprises collecting tail water obtained after the resource recovery of PTA refined wastewater as wastewater; passing the wastewater through sodium ion exchange resin to remove residual cobalt, manganese and other metal ions; degassing the wastewater to remove carbon dioxide dissolved in the wastewater; adjusting the pH value of the wastewater to 10-11; the wastewater enters a high-pressure reverse osmosis system for high-power concentration; and recovering the waste heat of the refining process section to evaporate and crystallize the concentrated solution. The treatment device comprises a carbon remover body, wherein a gas outlet is formed in the top of the carbon remover body, a gas inlet is formed in the left side of the carbon remover body, a water inlet is formed in the right side of the carbon remover body, and a water outlet pipe is formed in the bottom of the carbon remover body; the device also comprises a bent pipe, a first threaded rod, two groups of guide rods, an adjusting plate and a lifting plate.
Description
Technical Field
The invention relates to the technical field of auxiliary wastewater treatment devices, in particular to a process for discharging and treating refined terephthalic acid wastewater and a treatment device thereof.
Background
PTA refining wastewater contains terephthalic acid, PT acid, manganese cobalt ions and a large amount of water, and several process routes are disclosed for targeted recovery. However, tail water is discharged in any route, and zero discharge of waste water is not realized.
The carbon remover is equipment for removing water free carbon dioxide by using a blast degassing mode, water is introduced from the upper part of the equipment and flows through the surface of the packing layer through a spraying device, and air enters from a lower air port and reversely passes through the packing layer. Free carbon dioxide in the water is quickly resolved into the air and discharged from the top. The water treatment process is generally arranged behind a hydrogen ion exchanger and a reverse osmosis device, and under the normal preparation condition, carbon dioxide remained in water after being degassed by a carbon remover is not more than 5 mg/L.
Among the prior art, the outlet pipe of carbon removal ware bottom is the most vertical installation of delivery from the factory, when using, needs external return bend, because carbon removal ware bottom space is little to the return bend is heavier, and it is fixed to use a plurality of bolt and nut, and during bolt and nut installation, need lift the return bend, and it is inconvenient to cause the return bend installation, influences the use.
Disclosure of Invention
In order to solve the above technical problems, a first technical object of the present invention is to provide a process for treating purified terephthalic acid wastewater discharge, which can effectively realize a zero discharge process,
the second technical purpose of the invention is to provide a purified terephthalic acid refined wastewater treatment device which is simple in structure, convenient for installation of a bent pipe at the bottom of a carbon remover, improved in use convenience and beneficial to realization of zero discharge of wastewater.
The first technical purpose of the invention is realized by the following scheme:
the process for treating the discharge of the refined wastewater of the purified terephthalic acid is characterized by comprising the following steps of:
(1) collecting tail water obtained after the PTA refining wastewater is recycled as wastewater;
(2) passing the wastewater through sodium ion exchange resin to remove residual cobalt, manganese and other metal ions;
(3) degassing the wastewater to remove carbon dioxide dissolved in the wastewater;
(4) adjusting the pH value of the wastewater to 10-11;
(5) the wastewater enters a high-pressure reverse osmosis system for high-power concentration, the fresh water recovery rate is 85-95%, and the concentration multiple is 8-12 times;
(6) and recovering the waste heat of the refining process section to evaporate and crystallize the concentrated solution.
The invention discloses a zero-emission treatment process for residual concentrated water after recycling Purified Terephthalic Acid (PTA) refined wastewater and recycling desalted water through reverse osmosis. After the residual concentrated water is pretreated, high-pressure reverse osmosis is adopted for high-power concentration, the residual concentrated solution is reduced to the minimum, and the obtained pure water is directly recycled. And then the residual concentrated solution is subjected to multiple-effect evaporation decrement by utilizing the waste heat of the PTA refining process stage. And carrying out solid-liquid separation on the obtained slurry, returning clear liquid to the multi-effect evaporation unit, and treating residues additionally.
Preferably, before the wastewater passes through the sodium ion exchange resin, the method further comprises the steps of cooling the PTA mother solid waste liquid to 35-45 ℃, separating out terephthalic acid into tiny particles, filtering and concentrating by adopting a silicon carbide film, and separating out terephthalic acid solid; and (4) filtering the produced water by the silicon carbide film, and allowing the produced water to enter an adsorption unit to adsorb dissolved PT acid.
The invention creatively adopts the silicon carbide film to carry out resource utilization of the mother solid waste liquid of the purified terephthalic acid; the specific process of the invention endows and strengthens the advantages of silicon carbide film filtration, strengthens the acid resistance and the concentration function of the whole device system, and ensures that the concentrated water enters the water again and becomes more concentrated, thereby facilitating the recovery of phthalic acid particles by a centrifuge; meanwhile, PT acid in an ionic state at a water production end is concentrated and enters water production, and the water production enters an adsorption device to adsorb the PT acid; PT acid concentration means that the pH value is lower and lower, the smaller the pH value is, the more favorable the adsorption is, and the convenience is brought to the recovery of phthalic acid particles at the concentrated water end; thereby forming the combined advantageous effect of low-temperature cooling process of PTA mother solid waste liquid and continuous cycle treatment to lower and lower the pH value of the pure terephthalic acid mother solid waste liquid, and being more beneficial to recycling phthalic acid particles, thereby forming the synergistic effect of resource utilization integration.
Preferably, the aperture of the silicon carbide film is 0.08-0.12 micron, and the flow channel of the silicon carbide film is 5-7 mm.
The silicon carbide film is formed by high-temperature sintering by adopting a recrystallization technology, a flow passage is formed by a porous supporting layer, a transition layer and a microporous layer, the cross section of the flow passage is asymmetrically distributed, the flow passage is a circular hole passage with the diameter of 5-7mm, the aperture is large, smooth and not easy to pollute. The PTA mother liquor carrying particulate matters flows in a flow channel in a cross way at a high speed, so that the pollution and blockage of membrane holes are reduced.
Preferably, the aperture of the silicon carbide film is 0.1 micron, and the flow channel of the silicon carbide film is 6 mm.
The flow channel is a silicon carbide film round hole channel with the diameter of 6mm, and the aperture is large, smooth and not easy to pollute; the PTA mother liquor carrying particulate matters flows in the flow channel in a cross way at a high speed, so that the pollution and blockage of membrane holes are reduced.
Preferably, the device used for degassing the wastewater in the step (3) is a carbon remover or a membrane degassing device.
Preferably, the step (4) adjusts the pH of the wastewater to an alkaline pH of 10.5.
Preferably, the step (6) is to feed the reverse osmosis concentrated solution into a multi-effect evaporator for evaporation and crystallization; the heat source adopts the waste heat in the PTA refined wastewater, the waste heat is evaporated at low temperature under the negative pressure condition, and the steam generated by evaporation is condensed by a condenser and then recycled; the slurry finally generated by the evaporator is subjected to solid-liquid separation, clear liquid returns to the front end, and the solid is further treated.
The invention relates to a purified terephthalic acid refined wastewater treatment device which comprises a carbon remover body, wherein a gas outlet is formed in the top of the carbon remover body, a gas inlet is formed in the left side of the carbon remover body, a water inlet is formed in the right side of the carbon remover body, a water outlet pipe is formed in the bottom of the carbon remover body, the water outlet pipe is communicated with a first flange, and four groups of supporting legs are arranged at the bottom of the carbon remover body; the device also comprises a bent pipe, a first threaded rod, two groups of guide rods, an adjusting plate and a lifting plate, wherein each two groups of supporting legs are fixedly connected with a group of connecting plates, first bearings are arranged on the connecting plates, the first threaded rod is connected with inner rings of the two groups of first bearings, a translation plate is in threaded connection with the first threaded rod, the front half area and the rear half area of the translation plate are respectively provided with a transverse through hole, two ends of each two groups of guide rods are respectively connected with the two groups of connecting plates, each group of guide rods passes through one group of through holes, the front half area and the rear half area of the translation plate are respectively provided with a longitudinal through hole, each group of through holes is respectively in sliding connection with a sliding rod, the bottom end of each sliding rod is rotatably provided with a first roller, the connecting plate positioned on the left side is connected with a triangular plate through two groups of transition rods, the first roller is positioned on the inclined plane of the triangular plate, the two groups of sliding rods are connected with the lifting plate, the lifting plate is provided with an adjusting mechanism, the output end of the adjusting mechanism is connected with the adjusting plate, the top of the adjusting plate is provided with a circular arc-shaped placing seat, the bent pipe is provided with a second flange matched with the first flange, and the bent pipe is placed on the circular arc-shaped placing seat.
According to the device for treating the purified terephthalic acid refined wastewater, the adjusting mechanism comprises a second threaded rod and four groups of telescopic rods, a second bearing is arranged on the lifting plate, the second threaded rod is connected with the inner ring of the second bearing, a threaded pipe fixedly connected with an adjusting plate is in threaded connection with the second threaded rod, two ends of each group of telescopic rods are respectively connected with the lifting plate and the adjusting plate, a square ring is fixedly connected with the second threaded rod, and a nut is in threaded connection with the second threaded rod.
According to the purified terephthalic acid refined wastewater treatment device, the front side and the rear side of the bottom of the lifting plate are respectively provided with the inclined rod, the left end of each inclined rod is rotatably provided with the second roller, and the second roller is in contact with the translation plate.
The invention relates to a purified terephthalic acid refined wastewater treatment device.
According to the purified terephthalic acid refined wastewater treatment device, the end surface of the guide rod is circular.
According to the purified terephthalic acid refined wastewater treatment device, the end face of the sliding rod is circular.
The invention relates to a purified terephthalic acid refined wastewater treatment device, wherein a rubber pad in contact with a bent pipe is arranged on the inner wall of an arc-shaped placing seat.
Compared with the prior art, the invention has the beneficial effects that:
1. the pretreated tail water runs under the working condition of high pH, the membrane pollution of reverse osmosis is reduced, and the high-power concentration of the tail water is realized; the waste heat of the refining process section is recovered to carry out evaporation crystallization on the concentrated solution, so that the evaporation cost is reduced and the zero-emission economic benefit is improved while the condensed water is recovered; the recovery of the desalted water can reach more than 90 percent, and is improved by 20 percent on the basis of 70 percent of the prior art;
2. under the support of the connecting plate and the first bearing, the first threaded rod can rotate, and the translation plate cannot rotate under the action of the two groups of guide rods, so that the translation plate can transversely displace by rotating the first threaded rod, and the sliding rod is in sliding connection with the translation plate, so that when the first roller moves to a triangular plate, the lifting plate, the sliding rod, the bent pipe and the like can change in height;
3. the invention creatively adopts the silicon carbide film to carry out resource utilization of the pure terephthalic acid mother solid waste liquid; the specific process of the invention endows and strengthens the filtering advantage of the silicon carbide film, so that the acid resistance and the concentration function of the whole device system are strengthened, the concentrated water enters the water again, the concentrated water becomes more concentrated, and the recovery of phthalic acid particles by a centrifugal machine is facilitated; meanwhile, PT acid in an ionic state at a water production end is concentrated and enters water production, and the water production enters an adsorption device to adsorb the PT acid; PT acid concentration means that the pH value is lower and lower, the smaller the pH value is, the more favorable the adsorption is, and the convenience is brought to the recovery of phthalic acid particles at the concentrated water end; thereby forming the combined advantageous effect of low-temperature cooling process of PTA mother solid waste liquid and continuous cycle treatment to lower and lower the pH value of the pure terephthalic acid mother solid waste liquid, and being more beneficial to recycling phthalic acid particles, thereby forming the synergistic effect of resource utilization integration.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
FIG. 3 is a bottom perspective view of the first threaded rod, guide rods, lifter plate, connecting plate, slide rods, diagonal rods, and second roller;
FIG. 4 is a top perspective view of a first threaded rod, guide rod, lift plate, connecting plate, slide rod, diagonal rod, and second roller;
FIG. 5 is a side view of the circular arc-shaped seat and rubber pad;
in the drawings, the reference numbers: 1. a carbon remover body; 2. a water outlet pipe; 3. a first flange; 4. a support leg; 5. bending the pipe; 6. a first threaded rod; 7. a guide bar; 8. an adjusting plate; 9. a lifting plate; 10. a connecting plate; 11. a translation plate; 12. a slide bar; 13. a first roller; 14. a transition bar; 15. a set square; 16. a circular arc-shaped placing seat; 17. a second flange; 18. a second threaded rod; 19. a telescopic rod; 20. a threaded pipe; 21. a square ring; 22. a nut; 23. a diagonal bar; 24. a second roller; 25. a hand wheel; 26. and (7) a rubber pad.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
Example 1
The process for treating the discharge of the refined wastewater of the purified terephthalic acid comprises the following steps:
(1) tail water obtained after the PTA refining wastewater is recycled is collected as wastewater;
(2) passing the wastewater through sodium ion exchange resin to remove residual cobalt and manganese and other metal ions;
(3) degassing the wastewater, wherein a membrane degassing device is adopted as a wastewater degassing device to remove carbon dioxide dissolved in the wastewater;
(4) adjusting the pH value of the wastewater to 10-11;
(5) the wastewater enters a high-pressure reverse osmosis system for high-power concentration, the fresh water recovery rate is 85-95%, and the concentration multiple is 8-12 times;
(6) recovering the waste heat of the refining process section to evaporate and crystallize the concentrated solution: specifically, reverse osmosis concentrated solution enters a multi-effect evaporator for evaporation and crystallization; the heat source adopts the waste heat in the PTA refining wastewater, the waste heat is evaporated at low temperature under the negative pressure condition, and the steam generated by evaporation is condensed by a condenser and then recycled; the slurry finally produced by the evaporator is subjected to solid-liquid separation, clear liquid returns to the front end, and solid is treated separately.
Through detection, the recovery rate of phthalic acid particles is 95-96wt%, the recovery rate of PT at the adsorption end is 99.68-99.88wt%, and the recovery rate of manganese and cobalt ions in the mother solid waste liquid is 97.5-98.5 wt%.
Example 2
The process for discharging and treating the refined wastewater of the purified terephthalic acid comprises the following steps:
(1) collecting tail water obtained after the PTA refining wastewater is recycled as wastewater;
(2) passing the wastewater through sodium ion exchange resin to remove residual cobalt and manganese and other metal ions;
(3) degassing the wastewater, wherein a membrane degassing device is adopted as a wastewater degassing device to remove carbon dioxide dissolved in the wastewater;
(4) adjusting the pH value of the wastewater to 10-11;
(5) the wastewater enters a high-pressure reverse osmosis system for high-power concentration, the fresh water recovery rate is 85-95%, and the concentration multiple is 8-12 times;
(6) recovering the waste heat of the refining process section to evaporate and crystallize the concentrated solution: specifically, reverse osmosis concentrated solution enters a multi-effect evaporator for evaporation and crystallization; the heat source adopts the waste heat in the PTA refined wastewater, the waste heat is evaporated at low temperature under the negative pressure condition, and the steam generated by evaporation is condensed by a condenser and then recycled; the slurry finally generated by the evaporator is subjected to solid-liquid separation, clear liquid returns to the front end, and the solid is further treated.
Through detection, the recovery rate of phthalic acid particles is 96-97wt%, the recovery rate of PT at an adsorption end is 99.89-99.95wt%, and the recovery rate of manganese and cobalt ions in the mother solid waste liquid is 97.9-98.9 wt%.
Example 3
The process for discharging and treating the refined wastewater of the purified terephthalic acid comprises the following steps:
(1) collecting tail water obtained after the PTA refining wastewater is recycled as wastewater;
(2) passing the wastewater through sodium ion exchange resin to remove residual cobalt and manganese and other metal ions;
(3) degassing the wastewater, wherein a membrane degassing device is adopted as a wastewater degassing device to remove carbon dioxide dissolved in the wastewater;
(4) adjusting the pH value of the wastewater to 10-11;
(5) the wastewater enters a high-pressure reverse osmosis system for high-power concentration, the recovery rate of fresh water is 85-95%, and the concentration multiple is 8-12;
(6) recovering waste heat of the refining process section to carry out evaporative crystallization on the concentrated solution: specifically, the reverse osmosis concentrated solution enters a multi-effect evaporator for evaporation and crystallization; the heat source adopts the waste heat in the PTA refined wastewater, the waste heat is evaporated at low temperature under the negative pressure condition, and the steam generated by evaporation is condensed by a condenser and then recycled; the slurry finally produced by the evaporator is subjected to solid-liquid separation, clear liquid returns to the front end, and solid is treated separately.
Through detection, the recovery rate of phthalic acid particles is 95-97wt%, the recovery rate of PT at the adsorption end is 99.91-99.93wt%, and the recovery rate of manganese and cobalt ions in the mother solid waste liquid is 98.8-99.3 wt%.
Example 4
The same as example 1, except that the wastewater degassing treatment apparatus of the step (3) was a carbon remover.
Step (4), adjusting the pH value of the wastewater to alkaline pH value of 10.5; and (5) enabling the wastewater in the step (5) to enter a high-pressure reverse osmosis system for high-power concentration, wherein the fresh water recovery rate is 90%, and the concentration multiple is 10 times.
As shown in fig. 1 to 5, the device for treating purified terephthalic acid refined wastewater comprises a carbon remover body 1, wherein an air outlet is formed in the top of the carbon remover body 1, an air inlet is formed in the left side of the carbon remover body 1, a water inlet is formed in the right side of the carbon remover body 1, a water outlet pipe 2 is formed in the bottom of the carbon remover body 1, the water outlet pipe 2 is communicated with a first flange 3, and four groups of supporting legs 4 are arranged at the bottom of the carbon remover body 1; the device comprises a bent pipe 5, a first threaded rod 6, two groups of guide rods 7, an adjusting plate 8 and a lifting plate 9, wherein each two groups of supporting legs 4 are fixedly connected with a group of connecting plates 10, first bearings are arranged on the connecting plates 10, the first threaded rod 6 is connected with the inner rings of the two groups of first bearings, a translation plate 11 is in threaded connection with the first threaded rod 6, transverse through holes are formed in the front half area and the rear half area of the translation plate 11, two ends of each two groups of guide rods 7 are respectively connected with the two groups of connecting plates 10, each group of guide rods 7 penetrates through one group of through holes, longitudinal through holes are formed in the front half area and the rear half area of the translation plate 11, a sliding rod 12 is in sliding connection with each group of through holes, a first roller 13 is rotatably arranged at the bottom end of the sliding rod 12, the connecting plate 10 on the left side is connected with a triangular plate 15 through two groups of transition rods 14, and the first roller 13 is positioned on the inclined plane of the triangular plate 15, the two groups of sliding rods 12 are connected with a lifting plate 9, an adjusting mechanism is arranged on the lifting plate 9, the output end of the adjusting mechanism is connected with an adjusting plate 8, an arc-shaped placing seat 16 is arranged at the top of the adjusting plate 8, a second flange 17 matched with the first flange 3 is arranged on the elbow pipe 5, and the elbow pipe 5 is placed on the arc-shaped placing seat 16; supported by the connecting plate 10 and by the first bearings, the first threaded bar 6 is rotatable, and the translation plate 11 is not rotatable by the action of the two sets of guide bars 7, so that the first threaded rod 6 is rotated to enable the translational plate 11 to generate transverse displacement, and because the sliding rod 12 is in sliding connection with the translational plate 11, when the first roller 13 moves to the triangular plate 15, the height of the lifting plate 9, the sliding rod 12, the elbow 5 and the like changes, when the elbow 5 is installed, the elbow 5 is placed on the arc-shaped placing seat 16, the position and the angle of the elbow 5 are manually adjusted, the height of the elbow 5 is adjusted through the adjusting mechanism, then the first threaded rod 6 is rotated to enable the elbow 5 to move leftwards and the like, in the moving process, the second flange 17 on the elbow 5 is in butt joint with the first flange 3, then fasten, for prior art, need not the user and lift return bend 5, improve the convenience.
Tail water obtained after the resource recovery of the purified terephthalic acid refined wastewater is generally first-stage reverse osmosis concentrated water, metal ions such as cobalt, manganese and the like in raw water are deeply removed by adopting a sodium cation resin ion exchanger, then carbon dioxide dissolved in the wastewater is removed by adopting a carbon remover or a membrane degassing device, then the pH is adjusted to be alkaline pH10, the tail water is separated by high-pressure reverse osmosis, the recovery rate of fresh water is 90 percent, the tail water is concentrated ten times, the fresh water is recycled, and reverse osmosis concentrated solution enters a multi-effect evaporator for evaporation and crystallization. The heat source adopts the waste heat in the PTA refined wastewater, the waste heat is evaporated at low temperature under the condition of negative pressure, the steam generated by evaporation is condensed by a condenser and then recycled, the slurry finally generated by an evaporator is subjected to solid-liquid separation, clear liquid returns to the front end, and the solid is separately treated.
According to the device for treating the purified terephthalic acid refined wastewater, the adjusting mechanism comprises a second threaded rod 18 and four groups of telescopic rods 19, a second bearing is arranged on the lifting plate 9, the second threaded rod 18 is connected with the inner ring of the second bearing, a threaded pipe 20 fixedly connected with the adjusting plate 8 is in threaded connection with the second threaded rod 18, two ends of each group of telescopic rods 19 are respectively connected with the lifting plate 9 and the adjusting plate 8, a square ring 21 is fixedly connected with the second threaded rod 18, and a nut 22 is in threaded connection with the second threaded rod 18; the principle of the adjusting mechanism is as follows: the square ring 21 is clamped by a wrench and rotated to rotate the second threaded rod 18, so that the height of the adjusting plate 8 is changed under the matching of the threaded pipe 20 and the four groups of telescopic rods 19, and the second flange 17 is conveniently butted with the first flange 3 by adjusting the height of the adjusting plate 8.
According to the device for treating the purified terephthalic acid refined wastewater, the front side and the rear side of the bottom of the lifting plate 9 are respectively provided with the inclined rods 23, the left end of each inclined rod 23 is rotatably provided with the second roller 24, and the second roller 24 is in contact with the translation plate 11; when the lifting plate 9 moves, the second roller 24 is driven to roll along the translation plate 11, and the second roller 24 is arranged, so that the load of the lifting plate 9 is reduced, and the lifting plate and the sliding rod 12 are prevented from being broken.
According to the device for treating the purified terephthalic acid refined wastewater, the hand wheel 25 is arranged at the left end of the first threaded rod 6; the hand wheel 25 is held to rotate the first threaded rod 6, the first threaded rod 6 is more convenient to stress, and the use convenience is improved.
According to the purified terephthalic acid refined wastewater treatment device, the end face of the guide rod 7 is circular; the end face of the guide rod 7 is circular, and machining difficulty is reduced.
According to the purified terephthalic acid refined wastewater treatment device, the end face of the sliding rod 12 is circular; the end face of the sliding rod 12 is circular, so that the processing difficulty is reduced.
The invention relates to a purified terephthalic acid refined wastewater treatment device, wherein a rubber pad 26 which is contacted with a bent pipe 5 is arranged on the inner wall of a circular arc-shaped placing seat 16; the rubber pad 26 is arranged to increase the friction force with the elbow pipe 5 and prevent the movement in the moving process.
The invention relates to a purified terephthalic acid refined wastewater treatment device, which has the following principle of an adjusting mechanism when in work: clamping the square ring 21 by using a wrench and rotating to enable the second threaded rod 18 to rotate, so that the height of the adjusting plate 8 is changed under the matching of the threaded pipe 20 and the four groups of telescopic rods 19, and the second flange 17 is conveniently butted with the first flange 3 by adjusting the height of the adjusting plate 8;
under the support of the connecting plate 10 and the first bearing, the first threaded rod 6 can rotate, and the translation plate 11 can not rotate under the action of the two groups of guide rods 7, so that the translation plate 11 can generate transverse displacement by rotating the first threaded rod 6, and the sliding rod 12 is connected with the translation plate 11 in a sliding way, so that when the first roller 13 moves to the triangular plate 15, the lifting plate 9, the sliding rod 12, the elbow 5 and the like generate height change, when the lifting plate 9 moves, the second roller 24 is driven to roll along the translation plate 11, the second roller 24 is arranged, the load of the lifting plate 9 is reduced, the lifting plate and the sliding rod 12 are prevented from being broken, when the elbow 5 is installed, the elbow 5 is placed on a rubber pad 26 on the circular arc placing seat 16, the position and the angle of the elbow 5 are manually adjusted, the height of the elbow 5 is adjusted by the adjusting mechanism, then the first threaded rod 6 is rotated to enable the elbow 5 and the like to move leftwards, move the in-process, second flange 17 on the return bend 5 and first flange 3 accomplish the butt joint, then fastening can, for prior art, need not the user and lift return bend 5, improve the convenience. Through detection, the recovery rate of phthalic acid particles is 96-98wt%, the recovery rate of PT at the adsorption end is 99.88-99.98wt%, and the recovery rate of manganese cobalt ions in the mother solid waste liquid is 99.4-99.5 wt%.
Example 5
The method is the same as the embodiment 1, except that before the wastewater passes through the sodium ion exchange resin, the method also comprises the steps of cooling the PTA mother solid waste liquid to 35 ℃, separating out the terephthalic acid into tiny particles, filtering and concentrating by adopting a silicon carbide film, and separating out the terephthalic acid solid; and (3) the silicon carbide film filtered produced water enters an adsorption unit to adsorb the dissolved PT acid. Through detection, the recovery rate of phthalic acid particles is 97-99wt%, the recovery rate of PT at the adsorption end is 99.95-99.98wt%, and the recovery rate of manganese and cobalt ions in the mother solid waste liquid is 99.4-99.5 wt%.
Example 6
The method is the same as the embodiment 2, except that before the wastewater passes through the sodium ion exchange resin, the method also comprises the steps of cooling the PTA mother solid wastewater to 45 ℃, separating out the terephthalic acid into tiny particles, filtering and concentrating by adopting a silicon carbide film, and separating out the terephthalic acid solid; and (4) filtering the produced water by the silicon carbide film, and allowing the produced water to enter an adsorption unit to adsorb dissolved PT acid.
Through detection, the recovery rate of phthalic acid particles is 98-99wt%, the recovery rate of PT at the adsorption end is 99.97-99.99wt%, and the recovery rate of manganese cobalt ions in the mother solid waste liquid is 99.5-99.7 wt%.
Example 7
The method is the same as the embodiment 3, except that before the wastewater passes through the sodium ion exchange resin, the method also comprises the steps of cooling the PTA mother solid waste liquid to 40 ℃, separating out the terephthalic acid into tiny particles, filtering and concentrating by adopting a silicon carbide film, and separating out the terephthalic acid solid; and (3) the silicon carbide film filtered produced water enters an adsorption unit to adsorb the dissolved PT acid.
Through detection, the recovery rate of phthalic acid particles is 97-99wt%, the recovery rate of PT at the adsorption end is 99.97-99.99wt%, and the recovery rate of manganese and cobalt ions in the mother solid waste liquid is 99.8-99.9 wt%.
Comparative example 1
The same as example 1, except that the step (3) was not subjected to degassing of wastewater; and (4) adjusting the pH value of the wastewater to 9. Detection shows that the recovery rate of each effective component in the mother solid waste liquid is 80-85 wt%.
Comparative example 2
The same as example 2, except that the step (3) was not subjected to degassing treatment of wastewater; and (4) adjusting the pH value of the wastewater to 12. Detection shows that the recovery rate of each effective component in the mother solid waste liquid is 81-86 wt%.
From the example and comparative example data it can be seen that:
the treatment steps and parameters of the refined terephthalic acid wastewater discharge treatment process can realize zero discharge; if the steps or parameters are lacked, zero emission is difficult to realize;
the device for treating the refined wastewater of the purified terephthalic acid can better realize zero discharge and has higher recovery rate;
3. the specific device and the process of the invention endow and strengthen the advantages of silicon carbide film filtration, strengthen the acid resistance and the concentration function of the whole device system, make the concentrated water enter the water again, make the concentrated water more concentrated, facilitate the recovery of phthalic acid particles by the centrifuge; meanwhile, PT acid in an ionic state is concentrated and enters a water production end to produce water, and the produced water enters an adsorption device to adsorb the PT acid; PT acid concentration means that the pH value is lower and lower, and the smaller the pH value is, the adsorption is more favorable, and the recovery of phthalic acid particles at a concentrated water end is facilitated; thereby forming the combined advantageous effect of low-temperature cooling process of PTA mother solid waste liquid and continuous cycle treatment to lower and lower the pH value of the pure terephthalic acid mother solid waste liquid, and being more beneficial to recycling phthalic acid particles, thereby forming the synergistic effect of resource utilization integration.
The installation mode, the connection mode or the arrangement mode of all the components are welding, riveting or other common mechanical modes, wherein the sliding/rotating fixation is that the components do not fall off under the sliding/rotating state, the sealing communication is that the two connecting pieces are communicated and simultaneously sealed, the specific structures, the models and the coefficient indexes of all the components are self-contained technologies, and the components can be implemented as long as the beneficial effects can be achieved.
In the purified terephthalic acid wastewater treatment apparatus of the present invention, unless otherwise specified, the terms "upper, lower, left, right, front, rear, inner, outer, and vertical and horizontal" and the like are used to indicate the orientation of the term in the normal use, or may be plain language, understood by those skilled in the art and not to be construed as limiting the term, hi the meantime, the numerical terms "first," "second," and "third," etc. do not denote any particular quantity or order, but rather are used to distinguish one from another, furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but also includes other elements not expressly listed or inherent to such process, method, article, or apparatus.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The process for treating the discharge of the refined wastewater of the purified terephthalic acid is characterized by comprising the following steps of:
(1) tail water obtained after the PTA refining wastewater is recycled is collected as wastewater;
(2) passing the wastewater through sodium ion exchange resin to remove residual cobalt and manganese and other metal ions;
(3) degassing the wastewater to remove carbon dioxide dissolved in the wastewater;
(4) adjusting the pH value of the wastewater to 10-11;
(5) the wastewater enters a high-pressure reverse osmosis system for high-power concentration, the recovery rate of fresh water is 85-95%, and the concentration multiple is 8-12;
(6) and recovering the waste heat of the refining process section to evaporate and crystallize the concentrated solution.
2. The discharge treatment process of wastewater from the refining of purified terephthalic acid according to claim 1, wherein the device used in the degassing treatment of wastewater from step (3) is a carbon remover or a membrane degassing device.
3. The discharge treatment process of purified terephthalic acid refining wastewater according to claim 1, wherein the step (4) adjusts the pH of the wastewater to alkaline pH 10.5; and (5) enabling the wastewater in the step (5) to enter a high-pressure reverse osmosis system for high-power concentration, wherein the fresh water recovery rate is 90%, and the concentration multiple is 10 times.
4. The discharge treatment process of purified terephthalic acid refining wastewater according to claim 1, wherein the step (6) is specifically that reverse osmosis concentrated solution enters a multi-effect evaporator for evaporation and crystallization; the heat source adopts the waste heat in the PTA refined wastewater, the waste heat is evaporated at low temperature under the negative pressure condition, and the steam generated by evaporation is condensed by a condenser and then recycled; the slurry finally generated by the evaporator is subjected to solid-liquid separation, clear liquid returns to the front end, and the solid is further treated.
5. The purified terephthalic acid refined wastewater treatment device used in the purified terephthalic acid refined wastewater discharge treatment process according to any one of claims 1 to 4 is characterized by comprising a carbon remover body (1), wherein a gas outlet is formed in the top of the carbon remover body (1), a gas inlet is formed in the left side of the carbon remover body (1), a water inlet is formed in the right side of the carbon remover body (1), a water outlet pipe (2) is formed in the bottom of the carbon remover body (1), the water outlet pipe (2) is communicated with a first flange (3), and four groups of support legs (4) are arranged at the bottom of the carbon remover body (1); the novel support is characterized by further comprising a bent pipe (5), a first threaded rod (6), two groups of guide rods (7), an adjusting plate (8) and a lifting plate (9), wherein each two groups of support legs (4) are fixedly connected with a group of connecting plates (10), first bearings are arranged on the connecting plates (10), the first threaded rod (6) is connected with inner rings of the two groups of first bearings, the first threaded rod (6) is in threaded connection with a translation plate (11), transverse through holes are formed in the front half area and the rear half area of the translation plate (11), two ends of each group of two groups of guide rods (7) are connected with the two groups of connecting plates (10) respectively, each group of guide rods (7) penetrates through one group of through holes, longitudinal through holes are formed in the front half area and the rear half area of the translation plate (11), sliding rods (12) are connected to the positions of each group of the through holes in a sliding mode, first idler wheels (13) are installed at the bottom ends of the sliding rods (12) in a rotating mode, be located on left connecting plate (10) and be connected with set-square (15) through two sets of transition pole (14), on first gyro wheel (13) were in set-square (15) inclined plane, two sets of slide bars (12) with lifter plate (9) are connected, set up adjustment mechanism on lifter plate (9), and the adjustment mechanism output is connected with regulating plate (8), and regulating plate (8) top is provided with arc and places seat (16), be provided with on return bend (5) with first flange (3) complex second flange (17), return bend (5) are placed on arc places seat (16).
6. The wastewater treatment device for refining the purified terephthalic acid as claimed in claim 5, wherein the adjusting mechanism comprises a second threaded rod (18) and four groups of telescopic rods (19), the lifting plate (9) is provided with a second bearing, the second threaded rod (18) is connected with the inner ring of the second bearing, the second threaded rod (18) is in threaded connection with a threaded pipe (20) fixedly connected with the adjusting plate (8), two ends of each group of the telescopic rods (19) are respectively connected with the lifting plate (9) and the adjusting plate (8), the second threaded rod (18) is fixedly connected with a square ring (21), and the second threaded rod (18) is in threaded connection with a nut (22).
7. The apparatus for treating wastewater from the refining of purified terephthalic acid according to claim 6, wherein the front and rear sides of the bottom of the lifting plate (9) are provided with inclined rods (23), the left end of each group of inclined rods (23) is rotatably provided with a second roller (24), and the second roller (24) is in contact with the translation plate (11).
8. The apparatus for treating wastewater from the purification of terephthalic acid according to claim 7, wherein a hand wheel (25) is provided at the left end of the first threaded rod (6).
9. The apparatus for treating purified terephthalic acid wastewater according to claim 8, wherein the shape of the end surface of the guide rod (7) and the shape of the end surface of the slide rod (12) are circular.
10. The apparatus for treating purified terephthalic acid wastewater according to claim 9, wherein the rubber pad (26) contacting the elbow pipe (5) is provided on the inner wall of the circular arc-shaped holder (16).
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