CN220759209U - Centrifugal mother liquor recovery device for trichloroisocyanuric acid production - Google Patents
Centrifugal mother liquor recovery device for trichloroisocyanuric acid production Download PDFInfo
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- CN220759209U CN220759209U CN202322343194.2U CN202322343194U CN220759209U CN 220759209 U CN220759209 U CN 220759209U CN 202322343194 U CN202322343194 U CN 202322343194U CN 220759209 U CN220759209 U CN 220759209U
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- neutralization
- hydrochloric acid
- mother liquor
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- 239000012452 mother liquor Substances 0.000 title claims abstract description 36
- YRIZYWQGELRKNT-UHFFFAOYSA-N 1,3,5-trichloro-1,3,5-triazinane-2,4,6-trione Chemical compound ClN1C(=O)N(Cl)C(=O)N(Cl)C1=O YRIZYWQGELRKNT-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229950009390 symclosene Drugs 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000011084 recovery Methods 0.000 title claims abstract description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 130
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 98
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 80
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 64
- 238000006298 dechlorination reaction Methods 0.000 claims abstract description 53
- 239000003513 alkali Substances 0.000 claims abstract description 47
- 239000007788 liquid Substances 0.000 claims abstract description 38
- 239000011780 sodium chloride Substances 0.000 claims abstract description 32
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000460 chlorine Substances 0.000 claims abstract description 19
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 19
- 238000004062 sedimentation Methods 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000010521 absorption reaction Methods 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims abstract description 8
- 238000009423 ventilation Methods 0.000 claims description 19
- 238000007599 discharging Methods 0.000 claims description 15
- 238000009826 distribution Methods 0.000 claims description 12
- 238000004064 recycling Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 230000008676 import Effects 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 3
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 abstract description 15
- QHFDHWJHIAVELW-UHFFFAOYSA-M sodium;4,6-dioxo-1h-1,3,5-triazin-2-olate Chemical compound [Na+].[O-]C1=NC(=O)NC(=O)N1 QHFDHWJHIAVELW-UHFFFAOYSA-M 0.000 abstract description 13
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 11
- 239000002699 waste material Substances 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 45
- 238000006243 chemical reaction Methods 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000003518 caustics Substances 0.000 description 5
- 239000011259 mixed solution Substances 0.000 description 3
- 239000003570 air Substances 0.000 description 2
- 238000004061 bleaching Methods 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000010413 mother solution Substances 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- 238000003900 soil pollution Methods 0.000 description 2
- ISAOUZVKYLHALD-UHFFFAOYSA-N 1-chloro-1,3,5-triazinane-2,4,6-trione Chemical class ClN1C(=O)NC(=O)NC1=O ISAOUZVKYLHALD-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 description 1
- FSNCEEGOMTYXKY-JTQLQIEISA-N Lycoperodine 1 Natural products N1C2=CC=CC=C2C2=C1CN[C@H](C(=O)O)C2 FSNCEEGOMTYXKY-JTQLQIEISA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- HWASUGAGLDBXHL-UHFFFAOYSA-K trisodium;1,3,5-triazanidacyclohexane-2,4,6-trione Chemical compound [Na+].[Na+].[Na+].[O-]C1=NC([O-])=NC([O-])=N1 HWASUGAGLDBXHL-UHFFFAOYSA-K 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model discloses a centrifugal mother liquor recovery device for trichloroisocyanuric acid production, which belongs to the technical field of chemical equipment and comprises a dechlorination tank, a first neutralization tank, a second neutralization tank and a sedimentation tank, wherein the dechlorination tank is provided with an exhaust port, a mother liquor, hydrochloric acid and an air inlet, the top of a communicating pipe communicated with the bottom of the dechlorination tank is connected with the first neutralization tank through an overflow pipe, the top of the first neutralization tank is provided with a hydrogen peroxide inlet, the bottom of the first neutralization tank is communicated with the bottom of the second neutralization tank, and the second neutralization tank connected with an alkali inlet pipe is connected with a sodium chloride production procedure. The trichloroisocyanuric acid in the mother liquor separated in the centrifugal washing process reacts with hydrochloric acid to obtain chlorine and cyanuric acid, and the chlorine enters a secondary absorption tower for treatment through a tail gas pipe; and part of hypochlorous acid reacts with hydrogen peroxide to generate water and hydrochloric acid, the hydrochloric acid and cyanuric acid are neutralized with liquid alkali in a second neutralization tank to obtain monosodium cyanurate and sodium chloride, and finally the monosodium cyanurate and the sodium chloride are conveyed to a sodium chloride production process to prepare sodium chloride and recycle monosodium cyanurate, so that the resource waste is reduced, and the method is environment-friendly.
Description
Technical Field
The utility model belongs to the technical field of chemical equipment, and particularly relates to a centrifugal mother liquor recovery device for trichloroisocyanuric acid production.
Background
Trichloroisocyanuric acid is one of the chloroisocyanuric acid series products, abbreviated as TCCA, and the pure product is powdery white crystal, slightly soluble in water and easily soluble in organic solvents. Trichloroisocyanuric acid is a new generation product of bleaching powder and bleaching essence, three wastes are greatly reduced compared with the bleaching essence, and the market demand is also higher along with wider application.
The existing trichloroisocyanuric acid production process mainly uses cyanuric acid, caustic soda and chlorine as raw materials, and the reaction principle is as follows: the cyanuric acid and caustic soda are prepared into trisodium cyanurate by molar ratio, and the slurry after salification is filled with chlorine in a chlorination kettle to carry out chlorination reaction at proper temperature to generate trichloroisocyanuric acid and sodium chloride. In view of the mixed solution of trichloroisocyanuric acid and sodium chloride generated in the chloridizing and synthesizing process, wet trichloroisocyanuric acid and sodium chloride solution are dehydrated and separated. At present, the mother solution centrifugally separated from the preamble contains sodium chloride and part of trichloroisocyanuric acid, and the existing mother solution is discharged after being simply diluted, so that not only can soil pollution be caused, but also water resources can be wasted, and the waste of resources can be caused because the sodium chloride cannot be recovered.
Disclosure of Invention
The utility model aims to provide a centrifugal mother liquor recovery device for trichloroisocyanuric acid production, and aims to solve the technical problems of soil pollution and resource waste caused by discharging centrifugal mother liquor containing sodium chloride and trichloroisocyanuric acid in the prior art.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the utility model provides a trichloroisocyanuric acid production is with centrifugal mother liquor recovery unit, includes dechlorination jar, first neutralization jar, second neutralization jar and subsider, the top of dechlorination jar is equipped with mother liquor import, hydrochloric acid import, air inlet and the gas vent that links to each other with the tail gas pipe, the outside of dechlorination jar is equipped with the communicating pipe with dechlorination jar bottom intercommunication, the top of communicating pipe links to each other with the import of first neutralization jar through the overflow pipe, the top of first neutralization jar is equipped with the hydrogen peroxide import, the bottom intercommunication of first neutralization jar and second neutralization jar, the second neutralization jar links to each other with the alkali pipe; the upper outlet of the second neutralization tank is connected with a settling tank, and the outlet of the settling tank is connected with a sodium chloride production process through a material conveying pump.
Preferably, a mother liquor inlet of the dechlorination tank is connected with a mother liquor pipe of the centrifugal washing process, and an exhaust port of the dechlorination tank is connected with a secondary absorption tower through an exhaust pipe and is used for removing chlorine in the exhaust gas; the inside of the dechlorination tank is provided with a ventilation main pipe from top to bottom, an air inlet at the upper end of the ventilation main pipe is connected with an outlet of a blower, radial air distribution pipes are arranged at the upper part and the lower part of the ventilation main pipe, and ventilation holes are formed in the air distribution pipes and the ventilation main pipe; a filter pipe is arranged in the middle of the bottom of the dechlorination tank, the upper end of the filter pipe is connected with the closed end of the bottom of the ventilation main pipe, the lower end of the filter pipe is connected with a discharge pipe penetrating through the bottom of the dechlorination tank, and the side walls around the filter pipe are fully provided with feed holes; the discharging pipe is connected with a hydrochloric acid inlet at the upper part of the dechlorination tank through a circulating pump and a circulating pipe.
Preferably, the hydrochloric acid inlet of the dechlorination tank is connected with a hydrochloric acid pipe, the hydrochloric acid pipe is connected with a hydrochloric acid intermediate tank through a hydrochloric acid pump, and the hydrochloric acid inlet is arranged at the top of the hydrochloric acid intermediate tank; the hydrochloric acid pipe is provided with a flowmeter and a control valve, and the control valve is linked with a PH meter on the overflow pipe and is used for controlling the PH value of the solution discharged from the dechlorination tank to be 1-2; and a liquid level meter is arranged on the hydrochloric acid intermediate tank.
Preferably, the hydrogen peroxide treatment device further comprises a hydrogen peroxide intermediate tank, wherein an inlet connected with a hydrogen peroxide pipe is arranged at the top of the hydrogen peroxide intermediate tank, and the bottom of the hydrogen peroxide intermediate tank is connected with the first neutralization tank through a hydrogen peroxide pump; the hydrogen peroxide pipe is provided with a control valve, and the hydrogen peroxide intermediate tank is provided with a liquid level meter.
Preferably, the outlet end of the overflow pipe extends to the bottom of the solution tank, and the solution tank is connected with the inlet of the first neutralization tank through a solution pump; the solution tank is provided with a liquid level meter, and the solution pump is linked with the liquid level meter.
Preferably, a filter is arranged at the top inlet of the first neutralization tank, a discharging pipe and a hydrogen peroxide pipe of the solution pump are connected with the filter, and a valve is arranged on the bottom discharging pipe of the first neutralization tank.
Preferably, the bottom inlet of the second neutralization tank is connected with the bottom discharging pipe of the first neutralization tank, the alkali inlet pipe of the second neutralization tank is connected with the alkali liquor middle tank through the liquid alkali pump, the outlet end of the alkali inlet pipe is connected with the bottom inlet of the second neutralization tank, the flow meter and the control valve are arranged on the alkali inlet pipe, the liquid outlet pipe is arranged on the upper portion of the second neutralization tank, and the PH meter on the liquid outlet pipe can be linked with the control valve on the alkali inlet pipe for controlling the PH value of the solution discharged by the second neutralization tank to be 8.5.
Preferably, the bottom inlet of the second neutralization tank is internally extended with a distributing pipe, and a plurality of discharging holes are distributed on the side wall of the distributing pipe; the alkali liquor in the alkali liquor intermediate tank is from an alkali liquor intermediate tank in the neutralization process through an alkali pipe.
Preferably, a plurality of horizontal baffle plates are arranged on the inner wall of the first neutralization tank, the baffle plates are arranged on the side walls of the opposite sides in a staggered manner from top to bottom, straight edges of two baffle plates adjacent to each other from top to bottom are arranged in a staggered manner, and the arc shape of the baffle plates is a major arc; the second neutralization tank is identical to the baffle arrangement in the first neutralization tank.
Preferably, the number of the sedimentation tanks is two, the two sedimentation tanks are sequentially connected in series, and the two sedimentation tanks are all provided with liquid level meters.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: compared with the prior art, the method has the advantages that mother liquor and hydrochloric acid separated in a centrifugal washing process are input into the dechlorination tank, trichloroisocyanuric acid in the mother liquor reacts with the hydrochloric acid to obtain cyanuric acid and chlorine, air input from the air inlet of the dechlorination tank can discharge the chlorine, solution overflowed from the communicating pipe enters the first neutralization tank, part of hypochlorous acid in the solution reacts with hydrogen peroxide to generate water and hydrochloric acid, hydrochloric acid and cyanuric acid undergo neutralization reaction with liquid alkali in the second neutralization tank to obtain sodium chloride and monosodium cyanurate salt, the sodium chloride and monosodium cyanurate salt enter the sedimentation tank to be settled, and finally the solution in the sedimentation tank is conveyed to the sodium chloride production process to prepare sodium chloride through the conveying pump. According to the utility model, trichloroisocyanuric acid in mother liquor separated in the centrifugal washing process can be reacted with hydrochloric acid to obtain chlorine and cyanuric acid, hypochlorous acid is reacted with hydrogen peroxide to obtain water and hydrochloric acid, the discharged chlorine enters a secondary absorption tower through a tail gas pipe for treatment, and monosodium cyanurate and sodium chloride generated by reacting the generated cyanuric acid and hydrochloric acid with liquid alkali are recycled in a sodium chloride production process and sodium chloride is prepared, so that resource waste is reduced, and the production process is environment-friendly.
Drawings
The utility model will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic structural view of a centrifugal mother liquor recycling device for producing trichloroisocyanuric acid provided by the embodiment of the utility model;
FIG. 2 is a schematic diagram of the structure of the dechlorination tank of FIG. 1;
in the figure: 501-dechlorination tank, 502-first neutralization tank, 503-second neutralization tank, 504-sedimentation tank, 505-circulation strand, 506-overflow pipe, 507-alkali inlet pipe, 508-feed pump, 509-hydrochloric acid pump, 510-ventilation main pipe, 511-blower, 512-gas distribution pipe, 513-filter pipe, 514-circulation pump, 515-hydrochloric acid intermediate tank, 516-hydrogen peroxide intermediate tank, 517-hydrogen peroxide pump, 518-solution tank, 519-solution pump, 520-liquid alkali pump, 521-liquid alkali intermediate tank, 522-distribution pipe, 523-alkali pipe, 524-baffle plate, 525-circulation pipe;
00-tail gas pipe; 1-control valve, 10-liquid level meter, 16-flowmeter, 18-PH meter.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, the centrifugal mother liquor recycling device for producing trichloroisocyanuric acid provided by the embodiment of the utility model comprises a dechlorination tank 501, a first neutralization tank 502, a second neutralization tank 503 and a sedimentation tank 504, wherein a mother liquor inlet, a hydrochloric acid inlet, an air inlet and an air outlet connected with a tail gas pipe 00 are arranged at the top of the dechlorination tank 501, a communicating pipe 505 communicated with the bottom of the dechlorination tank 501 is arranged at the outer part of the dechlorination tank 501, the top of the communicating pipe 505 is connected with the inlet of the first neutralization tank 502 through an overflow pipe 506, a hydrogen peroxide inlet is arranged at the top of the first neutralization tank 502, the first neutralization tank 502 is communicated with the bottom of the second neutralization tank 503, and the second neutralization tank 503 is connected with an alkali inlet pipe 507; the upper outlet of the second neutralization tank 503 is connected with a settling tank 504, and the outlet of the settling tank 504 is connected with a sodium chloride production process through a feed pump 508. The mother liquor from the centrifugal washing process and hydrochloric acid enter a dechlorination tank at the same time, trichloroisocyanuric acid in the mother liquor reacts with hydrochloric acid to generate water and chlorine, and the chlorine is discharged to a tail gas pipe to enter a secondary absorption tower for treatment; part of chlorine is dissolved in water to obtain hypochlorous acid and hydrochloric acid, the solution discharged from the overflow pipe contains sodium chloride, cyanuric acid and part of hypochlorous acid and hydrochloric acid, and the hypochlorous acid reacts with hydrogen peroxide in the first neutralization tank to generate water and hydrochloric acid; the mixed solution in the first neutralization tank enters a second neutralization tank, cyanuric acid and hydrochloric acid in the solution are neutralized with liquid alkali to generate monosodium cyanurate and sodium chloride, the solution enters a sedimentation tank for sedimentation, and finally the solution after impurity sedimentation enters a sodium chloride production process to recover sodium chloride, and the monosodium cyanurate is recycled to the neutralization process for proportioning.
In one embodiment of the present utility model, as shown in fig. 2, the mother liquor inlet of the dechlorination tank 501 is connected to the mother liquor pipe of the centrifugal washing procedure, and the exhaust port of the dechlorination tank 501 is connected to the secondary absorption tower through an exhaust pipe 00, so as to remove chlorine and hypochlorous acid in the exhaust gas; a ventilation main pipe 510 is arranged in the dechlorination tank 501 from top to bottom, an air inlet at the upper end of the ventilation main pipe 510 is connected with an outlet of a blower 511, radial air distribution pipes 512 are arranged at the upper part and the lower part of the ventilation main pipe 510, and ventilation holes are formed in the air distribution pipes 512 and the ventilation main pipe 510; a filter pipe 513 is arranged in the middle of the bottom of the dechlorination tank 501, the upper end of the filter pipe 513 is connected with the closed end of the bottom of the ventilation main pipe 510, the lower end of the filter pipe 513 is connected with a discharging pipe penetrating through the bottom of the dechlorination tank 501, and the side walls around the filter pipe 513 are fully provided with feeding holes; the discharging pipe is connected with a hydrochloric acid inlet at the upper part of the dechlorination tank 501 through a circulating pump 514 and a circulating pipe 525. Wherein, the blower 511 selects the Roots blower, and the Roots blower inputs air into the solution of the dechlorination tank, so that the chlorine generated in the reaction process can be discharged, the discharged tail gas contains chlorine and part of hypochlorous acid, and enters the secondary absorption tower to react with the alkaline absorption liquid in the secondary absorption tower, and the tail gas is purified. The reacted solution is filtered by a filter tube and overflowed into a first neutralization tank through a flow tube and an overflow tube.
As a preferable scheme, the hydrochloric acid inlet of the dechlorination tank 501 is connected with a hydrochloric acid pipe, the hydrochloric acid pipe is connected with a hydrochloric acid intermediate tank 515 through a hydrochloric acid pump 509, and the top of the hydrochloric acid intermediate tank 515 is provided with a hydrochloric acid inlet; the hydrochloric acid pipe is provided with a flowmeter 16 and a control valve 1, and the control valve 1 is linked with a PH meter 18 on an overflow pipe 506 and is used for controlling the PH value of the solution discharged from the dechlorination tank 501 to be 1-2; the hydrochloric acid intermediate tank 515 is provided with a liquid level meter 10. By adopting the structure, continuous production can be realized, hydrochloric acid is buffered in the hydrochloric acid intermediate tank, uninterrupted supply of the hydrochloric acid can be realized through the hydrochloric acid pump, the quantity of the hydrochloric acid entering the dechlorination tank is precisely controlled by utilizing the linkage cooperation of the control valve and the PH meter, the PH value of the solution in the dechlorination tank is ensured to be kept between 1 and 2, and the reaction condition of the trichloroisocyanuric acid and the hydrochloric acid in the dechlorination tank is ensured.
Further optimizing the technical scheme, the hydrogen peroxide solution treatment device further comprises a hydrogen peroxide solution intermediate tank 516, wherein an inlet connected with a hydrogen peroxide solution pipe is arranged at the top of the hydrogen peroxide solution intermediate tank 516, and the bottom of the hydrogen peroxide solution intermediate tank 516 is connected with the first neutralization tank 502 through a hydrogen peroxide solution pump 517; the hydrogen peroxide pipe is provided with a control valve 1, and the hydrogen peroxide intermediate tank 516 is provided with a liquid level meter 10. Similarly, continuous production can be realized by adopting the structure, hydrogen peroxide is buffered in the hydrogen peroxide intermediate tank, and uninterrupted supply of hydrogen peroxide can be realized through the hydrogen peroxide pump.
In particular assembly, the outlet end of the overflow tube 506 extends to the bottom of the solution tank 518, and the solution tank 518 is connected to the inlet of the first neutralization tank 502 by a solution pump 519; the solution tank 518 is provided with a liquid level meter 10, and the solution pump 519 is linked with the liquid level meter 10 to avoid overflow of the solution tank. The solution tank is utilized to buffer the solution after the reaction in the dechlorination tank, and the solution is conveyed to the first neutralization tank for further reaction through the solution pump.
Further optimizing the above scheme, the top import of first neutralization jar 502 is equipped with the filter, the discharging pipe and the hydrogen peroxide solution pipe of solution pump 519 all link to each other with the filter, be equipped with the valve on the bottom discharging pipe of first neutralization jar 502. And filtering impurities in the feed liquid entering the first neutralization tank by adopting a filter, and further reacting hydrogen peroxide with hypochlorous acid in the solution to generate water and hydrochloric acid.
In one embodiment of the utility model, the bottom inlet of the second neutralization tank 503 is connected with the bottom discharge pipe of the first neutralization tank 502, the alkali inlet pipe 507 of the second neutralization tank 503 is connected with the alkali liquor middle tank 521 through the alkali liquor pump 520, the outlet end of the alkali inlet pipe 507 is connected with the bottom inlet of the second neutralization tank 503, the alkali inlet pipe 507 is provided with a flow meter 16 and a control valve 1, the upper part of the second neutralization tank 503 is provided with a liquid outlet pipe, and the PH meter 18 on the liquid outlet pipe can be linked with the control valve 1 on the alkali inlet pipe 507 to control the PH value of the solution discharged by the second neutralization tank 503 to be 8.5 so as to keep the solution in the second neutralization tank slightly alkaline. Wherein, the flowmeter on the alkali inlet pipe is a float flowmeter. By adopting the structure, cyanuric acid and hydrochloric acid in the solution respectively react with liquid alkali in a second neutralization tank to generate monosodium cyanurate and sodium chloride respectively, so as to obtain a mixed solution of monosodium cyanurate and sodium chloride.
During specific manufacturing, the bottom inlet of the second neutralization tank 503 extends the material distribution pipe 522 inwards, and a plurality of discharging holes are arranged on the side wall of the material distribution pipe 522, so that the entered liquid alkali and solution can be fully mixed, and the reaction of cyanuric acid and hydrochloric acid with the liquid alkali can be ensured to be as full as possible; the liquid caustic in the caustic intermediate tank 521 is supplied from the caustic intermediate tank of the neutralization step through a caustic pipe 523, and there is no need to separately provide a caustic tank. Wherein, the outside of the alkali pipe 523 is provided with a heat tracing pipe in parallel, so as to avoid the blockage of the pipeline by liquid alkali crystallization in the alkali pipe in a low-temperature environment.
In a specific design, the inner wall of the first neutralization tank 502 is provided with a plurality of horizontal baffles 524, the baffles 524 are staggered from top to bottom on the side walls of opposite sides, straight sides of two adjacent baffles 524 are staggered from top to bottom, and the arc shape of the baffles 524 is a major arc; the second neutralization tank 503 is arranged identically to the baffle 524 within the first neutralization tank 502. The baffle plates which are arranged in a staggered way up and down can prolong the flow path of the liquid, so that the hydrogen peroxide entering the first neutralization tank fully reacts with hypochlorous acid in the solution, and meanwhile, the liquid alkali entering the second neutralization tank fully reacts with cyanuric acid and hydrochloric acid in the solution.
Wherein, the number of the sedimentation tanks 504 is two, the two sedimentation tanks 504 are sequentially connected in series, and the two sedimentation tanks 504 are provided with the liquid level meter 10. The solution after the reaction is cached by using two settling tanks, so that uninterrupted feeding in the process of preparing sodium chloride in the following way is ensured.
Specifically, the dechlorination tank 501 and the sedimentation tank 504 are steel lining FRP materials, the hydrochloric acid intermediate tank 515 is FRP materials, and the first neutralization tank 502, the second neutralization tank 503, the hydrogen peroxide intermediate tank 516 and the solution tank 518 are PP materials.
In summary, the utility model has the advantages of reasonable design, compact structure, high steam utilization rate and high calcium chloride recovery rate, trichloroisocyanuric acid and hydrochloric acid in mother liquor separated in the centrifugal washing process react in the dechlorination tank to obtain cyanuric acid and chlorine, air input into the dechlorination tank can discharge the chlorine, part of the chlorine and water generate hypochlorous acid in the dechlorination tank, part of hypochlorous acid in solution overflowed from the communicating pipe reacts with hydrogen peroxide in the first neutralization tank to generate water and hydrochloric acid, hydrochloric acid in the solution and cyanuric acid in the second neutralization tank react with liquid alkali to obtain sodium chloride and monosodium cyanurate salt, the sodium chloride and monosodium cyanurate salt enter the sedimentation tank to be settled, the settled solution is conveyed to the sodium chloride production process to prepare sodium chloride, and the monosodium cyanurate salt obtained is recycled to the neutralization process. The utility model can reduce resource waste, avoid polluting soil and protect environment in the production process.
In the foregoing description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present utility model is not limited to the specific embodiments disclosed above.
Claims (10)
1. The utility model provides a trichloroisocyanuric acid production is with centrifugal mother liquor recovery unit which characterized in that: the device comprises a dechlorination tank, a first neutralization tank, a second neutralization tank and a sedimentation tank, wherein the top of the dechlorination tank is provided with a mother liquor inlet, a hydrochloric acid inlet, an air inlet and an air outlet connected with a tail gas pipe, a communicating pipe communicated with the bottom of the dechlorination tank is arranged outside the dechlorination tank, the top of the communicating pipe is connected with the inlet of the first neutralization tank through an overflow pipe, the top of the first neutralization tank is provided with a hydrogen peroxide inlet, the first neutralization tank is communicated with the bottom of the second neutralization tank, and the second neutralization tank is connected with an alkali inlet pipe; the upper outlet of the second neutralization tank is connected with a settling tank, and the outlet of the settling tank is connected with a sodium chloride production process through a material conveying pump.
2. The centrifugal mother liquor recycling device for producing trichloroisocyanuric acid according to claim 1, wherein: the mother liquor inlet of the dechlorination tank is connected with a mother liquor pipe of a centrifugal washing process, and the exhaust port of the dechlorination tank is connected with a secondary absorption tower through an exhaust pipe and is used for removing chlorine and trichloroisocyanuric acid in the exhaust; the inside of the dechlorination tank is provided with a ventilation main pipe from top to bottom, an air inlet at the upper end of the ventilation main pipe is connected with an outlet of a blower, radial air distribution pipes are arranged at the upper part and the lower part of the ventilation main pipe, and ventilation holes are formed in the air distribution pipes and the ventilation main pipe; a filter pipe is arranged in the middle of the bottom of the dechlorination tank, the upper end of the filter pipe is connected with the closed end of the bottom of the ventilation main pipe, the lower end of the filter pipe is connected with a discharge pipe penetrating through the bottom of the dechlorination tank, and the side walls around the filter pipe are fully provided with feed holes; the discharging pipe is connected with a hydrochloric acid inlet at the upper part of the dechlorination tank through a circulating pump and a circulating pipe.
3. The centrifugal mother liquor recycling device for producing trichloroisocyanuric acid according to claim 1, wherein: the hydrochloric acid inlet of the dechlorination tank is connected with a hydrochloric acid pipe, the hydrochloric acid pipe is connected with a hydrochloric acid intermediate tank through a hydrochloric acid pump, and the hydrochloric acid inlet is arranged at the top of the hydrochloric acid intermediate tank; the hydrochloric acid pipe is provided with a flowmeter and a control valve, and the control valve is linked with a PH meter on the overflow pipe and is used for controlling the PH value of the solution discharged from the dechlorination tank to be 1-2; and a liquid level meter is arranged on the hydrochloric acid intermediate tank.
4. The centrifugal mother liquor recycling device for producing trichloroisocyanuric acid according to claim 1, wherein: the hydrogen peroxide treatment device further comprises a hydrogen peroxide intermediate tank, wherein an inlet connected with a hydrogen peroxide pipe is arranged at the top of the hydrogen peroxide intermediate tank, and the bottom of the hydrogen peroxide intermediate tank is connected with the first neutralization tank through a hydrogen peroxide pump; the hydrogen peroxide pipe is provided with a control valve, and the hydrogen peroxide intermediate tank is provided with a liquid level meter.
5. The centrifugal mother liquor recycling device for producing trichloroisocyanuric acid according to claim 1, wherein: the outlet end of the overflow pipe extends to the bottom of the solution tank, and the solution tank is connected with the inlet of the first neutralization tank through a solution pump; the solution tank is provided with a liquid level meter, and the solution pump is linked with the liquid level meter.
6. The centrifugal mother liquor recycling device for producing trichloroisocyanuric acid according to claim 5, wherein: the top import of first neutralization jar is equipped with the filter, solution pump's discharging pipe and hydrogen peroxide solution pipe all link to each other with the filter, be equipped with the valve on the bottom discharging pipe of first neutralization jar.
7. The centrifugal mother liquor recycling device for producing trichloroisocyanuric acid according to claim 6, wherein: the bottom import of second neutralization jar links to each other with the bottom discharging pipe of first neutralization jar, the alkali pipe that advances of second neutralization jar links to each other with alkali lye intermediate tank through the liquid alkali pump, the exit end that advances the alkali pipe links to each other with the bottom import of second neutralization jar, be equipped with flowmeter and control valve on the alkali pipe that advances, the upper portion of second neutralization jar is equipped with the drain pipe, PH meter on the drain pipe can link to each other with the control valve on the alkali pipe that advances for control second neutralization jar exhaust solution PH value is 8.5.
8. The centrifugal mother liquor recycling device for producing trichloroisocyanuric acid according to claim 7, wherein: a material distribution pipe extends inwards from the bottom inlet of the second neutralization tank, and a plurality of discharge holes are formed in the side wall of the material distribution pipe; the alkali liquor in the alkali liquor intermediate tank is from an alkali liquor intermediate tank in the neutralization process through an alkali pipe.
9. The centrifugal mother liquor recycling device for producing trichloroisocyanuric acid according to claim 7, wherein: the inner wall of the first neutralization tank is provided with a plurality of horizontal baffle plates, the baffle plates are arranged on the side walls of the opposite sides in a staggered way from top to bottom, the straight sides of the two baffle plates adjacent to each other in the upper and lower direction are arranged in a staggered way, and the arc shape of the baffle plates is a major arc; the second neutralization tank is identical in arrangement to the baffles in the first neutralization tank.
10. The centrifugal mother liquor recovery device for producing trichloroisocyanuric acid according to any one of claims 1 to 9, wherein: the two settling tanks are sequentially connected in series, and the two settling tanks are provided with liquid level meters.
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| CN202322343194.2U CN220759209U (en) | 2023-08-30 | 2023-08-30 | Centrifugal mother liquor recovery device for trichloroisocyanuric acid production |
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