CN109651277B - Method and system for recycling cyanuric acid in dichloro mother liquor - Google Patents
Method and system for recycling cyanuric acid in dichloro mother liquor Download PDFInfo
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- CN109651277B CN109651277B CN201910085739.XA CN201910085739A CN109651277B CN 109651277 B CN109651277 B CN 109651277B CN 201910085739 A CN201910085739 A CN 201910085739A CN 109651277 B CN109651277 B CN 109651277B
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- reaction kettle
- dichloro
- pump
- cyanuric acid
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- 125000003963 dichloro group Chemical group Cl* 0.000 title claims abstract description 80
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 239000012452 mother liquor Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000004064 recycling Methods 0.000 title claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 93
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000010413 mother solution Substances 0.000 claims abstract description 45
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims abstract description 20
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims abstract description 20
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000007789 gas Substances 0.000 claims abstract description 15
- 238000011084 recovery Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims description 169
- 238000012544 monitoring process Methods 0.000 claims description 38
- 238000003756 stirring Methods 0.000 claims description 33
- 238000004062 sedimentation Methods 0.000 claims description 14
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 7
- 239000000460 chlorine Substances 0.000 claims description 7
- 229910052801 chlorine Inorganic materials 0.000 claims description 7
- 239000000243 solution Substances 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 239000013078 crystal Substances 0.000 abstract description 4
- 239000000839 emulsion Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000002378 acidificating effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 20
- 239000004155 Chlorine dioxide Substances 0.000 description 10
- 235000019398 chlorine dioxide Nutrition 0.000 description 10
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- CEJLBZWIKQJOAT-UHFFFAOYSA-N dichloroisocyanuric acid Chemical compound ClN1C(=O)NC(=O)N(Cl)C1=O CEJLBZWIKQJOAT-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
- C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
- C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
- C07D251/30—Only oxygen atoms
- C07D251/32—Cyanuric acid; Isocyanuric acid
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention is suitable for the technical field of chemical industry, and provides a method and a system for recycling cyanuric acid in a dichloro mother solution, wherein hydrogen chloride gas is filled into a reaction kettle for containing the dichloro mother solution, the hydrogen chloride gas and water in the dichloro mother solution generate hydrochloric acid, the hydrochloric acid reacts with hypochlorous acid in the dichloro mother solution to generate cyanuric acid, and then the dichloro mother solution in the reaction kettle enters an intermediate tank to further react the hypochlorous acid and the hydrochloric acid in the dichloro mother solution to generate cyanuric acid; the dichloro mother liquor in the intermediate tank enters a settling tank, the cyanuric acid has low solubility in an acidic environment and is in a crystal shape, the dichloro mother liquor is settled in the settling tank, the emulsion is put into a centrifugal machine to separate the cyanuric acid from the solution, the recovery of the cyanuric acid is completed, and the recovered cyanuric acid can be reused for production, so that the effect of saving resources is achieved.
Description
Technical Field
The invention belongs to the technical field of chemical industry, and particularly relates to a method and a system for recycling cyanuric acid in dichloro mother liquor.
Background
In the process of producing sodium dichloroisocyanurate, the produced wastewater (dichloro mother liquor) contains hypochlorous acid, perchloric acid and calcium chloride. In the existing state, the wastewater produced in the production process is discharged after being treated, so that the resource waste is caused.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a method and a system for recycling cyanuric acid in a dichloro mother solution, which can extract and recycle cyanuric acid in the dichloro mother solution.
In order to solve the above technical problems, a first embodiment of the present invention provides a method for recovering cyanuric acid in a dichloro mother solution, including:
filling hydrogen chloride gas into a reaction kettle containing the dichloro mother solution, so that hypochlorous acid in the dichloro mother solution reacts with hydrochloric acid to generate cyanuric acid;
pouring the dichloro mother solution in the reaction kettle into an intermediate tank, and further reacting hypochlorous acid and hydrochloric acid in the dichloro mother solution to generate cyanuric acid;
pouring the dichloro mother liquor of the intermediate tank into a settling tank to settle cyanuric acid;
and (3) placing the sedimentation liquid in the sedimentation tank into a centrifuge, and separating out cyanuric acid for recycling.
Further, the PH value of the dichloro mother liquor in the reaction kettle is 0.1-0.4.
Further, a stirring unit is arranged on the reaction kettle and is used for stirring the dichloro mother solution in the reaction kettle.
Further, be equipped with the circulating pump on the reation kettle and penetrate the suction pump, the inlet of circulating pump is connected the first liquid outlet of reation kettle, the liquid outlet of circulating pump is connected penetrate the suction pump inlet, penetrate the gas inlet of suction pump and connect the gas outlet of hydrogen chloride supply equipment, penetrate the liquid outlet of suction pump and connect the first liquid inlet of reation kettle.
The second embodiment of the invention provides a cyanuric acid recovery system in dichloro mother liquor, which comprises a reaction kettle, a middle tank, a settling tank, a centrifugal machine, an electric valve, a first liquid pump, a second liquid pump, a third liquid pump and a fourth liquid pump control unit;
the reaction kettle is provided with a stirring unit, a PH monitoring unit, a liquid level monitoring unit, a circulating pump and a jet-suction pump, wherein an air outlet at the top of the reaction kettle is connected with chlorine recovery equipment, a liquid inlet of the circulating pump is connected with a first liquid outlet of the reaction kettle, a liquid outlet of the circulating pump is connected with a liquid inlet of the jet-suction pump, an air inlet of the jet-suction pump is connected with an air outlet of a hydrogen chloride supply device through the electric valve, a liquid outlet of the jet-suction pump is connected with a first liquid inlet of the reaction kettle, a second liquid inlet of the reaction kettle is connected with a dichloro mother liquid supply device through the fourth liquid pump, a second liquid outlet of the reaction kettle is connected with a liquid inlet of the intermediate tank through the first liquid pump, a liquid outlet of the intermediate tank is connected with a liquid inlet of the sedimentation tank through the second liquid pump, a liquid outlet of the sedimentation tank is connected with the centrifugal machine through the third liquid pump, and the liquid level monitoring unit, the PH monitoring unit and the stirring unit are all arranged inside the reaction kettle;
the stirring unit, the PH monitoring unit, the liquid level monitoring unit, the circulating pump, the electric valve, the centrifugal machine, the first liquid pump, the second liquid pump, the third liquid pump and the fourth liquid pump are all connected with the control unit.
Further, the stirring unit comprises a motor arranged at the top of the reaction kettle and a rotating shaft vertically arranged inside the reaction kettle and provided with stirring blades, a shaft of the motor is connected with one end part of the rotating shaft, and the motor is connected with the control unit.
Further, the PH monitoring unit is arranged at the bottom of the reaction kettle or in the inner part of a pipeline between the reaction kettle and the first liquid pump.
Further, the liquid level monitoring unit comprises a first liquid level sensor and a second liquid level sensor, the first liquid level sensor and the second liquid level sensor are respectively installed at preset positions inside the reaction kettle, and the first liquid level sensor and the second liquid level sensor are both connected with the control unit.
Further, the control unit comprises a processor, a display unit and an input unit, wherein the display unit, the input unit, the stirring unit, the PH monitoring unit, the liquid level monitoring unit, the circulating pump, the electric valve, the centrifugal machine, the first liquid pump, the second liquid pump and the third liquid pump are all connected with the processor.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the invention designs a method for recycling cyanuric acid in a dichloro mother solution, which comprises the steps of filling hydrogen chloride gas into a reaction kettle containing the dichloro mother solution, enabling the hydrogen chloride gas and water in the dichloro mother solution to generate hydrochloric acid, enabling the hydrochloric acid to react with hypochlorous acid in the dichloro mother solution to generate cyanuric acid, and enabling the dichloro mother solution in the reaction kettle to enter an intermediate tank to enable the hypochlorous acid and the hydrochloric acid in the dichloro mother solution to further react to generate cyanuric acid; the dichloro mother liquor in the intermediate tank enters a settling tank, the cyanuric acid has low solubility in an acidic environment and is in a crystal shape, the dichloro mother liquor is settled in the settling tank, the emulsion is put into a centrifugal machine to separate the cyanuric acid from the solution, the recovery of the cyanuric acid is completed, and the recovered cyanuric acid can be reused for production, so that the effect of saving resources is achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for recycling cyanuric acid in a dichloro mother solution provided by an embodiment of the invention;
fig. 2 is a schematic structural diagram of a cyanuric acid recovery system in a dichloro mother solution according to an embodiment of the present invention.
In the figure: 1. a reaction kettle; 2. an intermediate tank; 3. a settling tank; 4. a centrifuge; 5. a hydrogen chloride supply device; 6. an electric valve; 7. a dichloro mother liquor supply device; 8. a first liquid pump; 9. a second liquid pump; 10. a third liquid pump; 11. a fourth liquid pump; 12. a circulation pump; 13. a jet-suction pump; 14. a liquid level monitoring unit; 15. a motor; 16. a rotating shaft; 17. stirring the leaves; 18. a PH monitoring unit; 19. chlorine recovery equipment.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to illustrate the technical scheme of the invention, the following description is made by specific examples.
As shown in fig. 1, the method for recovering cyanuric acid in dichloro mother liquor comprises the following steps:
step S101, hydrogen chloride gas is filled into a reaction kettle 1 containing dichloro mother solution, so that hypochlorous acid and hydrochloric acid in the dichloro mother solution react to generate cyanuric acid.
And step S102, pouring the dichloro mother solution in the reaction kettle 1 into the intermediate tank 2, and enabling hypochlorous acid and hydrochloric acid in the dichloro mother solution to further react to generate cyanuric acid.
Step S103, pouring the dichloro mother liquor of the intermediate tank 2 into the sedimentation tank 3 to sediment cyanuric acid.
And step S104, placing the sedimentation liquid in the sedimentation tank 3 into a centrifugal machine 4, and separating out cyanuric acid for recycling.
Filling hydrogen chloride gas into a reaction kettle 1 containing a dichloro mother solution, enabling the hydrogen chloride gas and water in the dichloro mother solution to generate hydrochloric acid, enabling the hydrochloric acid to react with hypochlorous acid in the dichloro mother solution to generate cyanuric acid, and enabling the dichloro mother solution in the reaction kettle 1 to enter an intermediate tank 2 to enable the hypochlorous acid in the dichloro mother solution to further react with the hydrochloric acid to generate cyanuric acid; the dichloro mother liquor in the intermediate tank 2 enters a settling tank 3, cyanuric acid is low in solubility in an acidic environment and is in a crystal shape, the dichloro mother liquor is settled in the settling tank 3, the emulsion is put into a centrifugal machine 4 to separate cyanuric acid from solution, the recovery of cyanuric acid is completed, and the recovered cyanuric acid can be reused for production, so that the effect of saving resources is achieved.
In one embodiment of the invention, the PH value of the dichloro mother liquor in the reaction kettle 1 is 0.1-0.4. The PH value of the dichloro mother solution is maintained at 0.1-0.4, so that the solubility of the produced cyanuric acid can be reduced to the greatest extent, and cyanuric acid is crystallized and separated out, thereby being convenient for separating cyanuric acid from the dichloro mother solution.
In one embodiment of the invention, the reaction kettle 1 is provided with a stirring unit, and the stirring unit is used for stirring the dichloro mother solution in the reaction kettle 1.
The stirring unit can stir the dichloro mother liquor in the reaction kettle 1, so that the generated hydrochloric acid and hypochlorous acid in the solution fully react to generate cyanuric acid, and the reaction kettle 1 is facilitated.
In one embodiment of the invention, a circulating pump 12 and a jet-suction pump 13 are arranged on the reaction kettle 1, a liquid inlet of the circulating pump 12 is connected with a first liquid outlet of the reaction kettle 1, a liquid outlet of the circulating pump 12 is connected with a liquid inlet of the jet-suction pump 13, an air inlet of the jet-suction pump 13 is connected with an air outlet of the hydrogen chloride supply equipment 5, and a liquid outlet of the jet-suction pump 13 is connected with the first liquid inlet of the reaction kettle 1.
The circulation pump 12 conveys the dichloro solution at the bottom of the reaction kettle 1 to the top of the reaction kettle 1 through the jet-suction pump 13, the circulation pump 12 can enable the dichloro solution to flow in the jet-suction pump 13 rapidly to form negative pressure, hydrogen chloride gas in the hydrogen chloride supply equipment 5 enters an air inlet of the jet-suction pump 13 under the action of the negative pressure, water in the dichloro mother solution enters the reaction kettle 1, and the generated hydrochloric acid reacts with hypochlorous acid in the reaction kettle 1 to generate cyanuric acid.
As shown in fig. 2, the cyanuric acid recovery system in the dichloro mother liquor comprises a reaction kettle 1, a middle tank 2, a settling tank 3, a centrifugal machine 4, an electric valve 6, a first liquid pump 8, a second liquid pump 9, a third liquid pump 10, a fourth liquid pump 11 and a control unit; the reaction kettle 1 is provided with a stirring unit, a PH monitoring unit 18, a liquid level monitoring unit 14, a circulating pump 12 and a jet suction pump 13, an air outlet at the top of the reaction kettle 1 is connected with a chlorine recovery device 19, a liquid inlet of the circulating pump 12 is connected with a first liquid outlet of the reaction kettle 1, a liquid outlet of the circulating pump 12 is connected with a liquid inlet of the jet suction pump 13, an air inlet of the jet suction pump 13 is connected with an air outlet of a hydrogen chloride supply device 5 through an electric valve 6, a liquid outlet of the jet suction pump 13 is connected with a first liquid inlet of the reaction kettle 1, a second liquid inlet of the reaction kettle 1 is connected with a dichloro mother liquid supply device 7 through a fourth liquid pump 11, a second liquid outlet of the reaction kettle 1 is connected with a liquid inlet of an intermediate tank 2 through a first liquid pump 8, a liquid outlet of the intermediate tank 2 is connected with a liquid inlet of a sedimentation tank 3 through a second liquid pump 9, a liquid outlet of the sedimentation tank 3 is connected with a centrifugal machine 4 through a third liquid pump 10, and the liquid level monitoring unit 14, the PH monitoring unit 18 and the stirring unit are all arranged inside the reaction kettle 1; the stirring unit, the PH monitoring unit 18, the liquid level monitoring unit 14, the circulating pump 12, the electric valve 6, the centrifugal machine 4, the first liquid pump 8, the second liquid pump 9, the third liquid pump 10 and the fourth liquid pump 11 are all connected with the control unit.
The chlorine dioxide mother liquor in the chlorine dioxide mother liquor supply equipment 7 is conveyed to the reaction kettle 1 through the fourth liquid pump 11, the circulating pump 12 conveys the chlorine dioxide mother liquor to the jet suction pump 13 from the bottom of the reaction kettle 1, the chlorine dioxide mother liquor enters from the top of the reaction kettle 1 through the jet suction pump 13, flowing the chlorine dioxide mother liquor forms negative pressure in the jet suction pump 13, the chlorine dioxide gas in the chlorine dioxide supply equipment 5 and the water generated hydrochloric acid in the chlorine dioxide mother liquor jointly enter into the reaction kettle 1 under the action of the negative pressure, the hydrochloric acid and hypochlorous acid in the reaction kettle 1 generate chlorine and cyanuric acid, the generated chlorine enters into the chlorine recovery equipment 19 from the top of the reaction kettle 1, the cyanuric acid is separated out in a crystal form in an acid environment, the chlorine dioxide mother liquor in the reaction kettle 1 enters into the intermediate tank 2 under the action of the first liquid pump 8, the hydrochloric acid and hypochlorous acid in the dichloro mother liquor in the intermediate tank 2 further react to generate cyanuric acid, the chlorine dioxide in the intermediate tank 2 enters into the sedimentation tank 3 under the action of the second liquid pump 9, the cyanuric acid is settled, the emulsion with cyanuric acid enters into the centrifugal machine 4 under the action of the third liquid pump 10, and the cyanuric acid is separated out of cyanuric acid is produced, and resources can be recovered, and the cyanuric acid can be used for recycling cyanuric acid resources are achieved.
In one embodiment of the invention, the stirring unit comprises a motor 15 arranged at the top of the reaction kettle 1 and a rotating shaft 16 vertically arranged inside the reaction kettle 1 and provided with stirring blades 17, wherein the shaft of the motor 15 is connected with one end part of the rotating shaft 16, and the motor 15 is connected with the control unit.
The control unit can control the rotation of the motor 15, the motor 15 drives the rotating shaft 16 to rotate in the reaction kettle 1, and the stirring blades 17 on the rotating shaft 16 stir the dichloro mother solution in the reaction kettle 1, so that the hydrochloric acid and hypochlorous acid in the dichloro mother solution are fully mixed for reaction, and the efficiency of generating cyanuric acid is improved.
In one embodiment of the present invention, the PH monitoring unit 18 is installed at the bottom of the reaction vessel 1 or inside the pipe between the reaction vessel 1 and the first liquid pump 8. The design can realize the PH value of the dichloro mother liquor in the outflow reaction kettle 1, when the PH value measured by the PH monitoring unit 18 is smaller than a set threshold range, the control unit controls the electric valve 6 to reduce the ventilation amount and reduce the speed of entering hydrogen chloride, and when the PH value measured by the PH monitoring unit 18 is larger than the set threshold range, the control unit controls the electric valve 6 to increase the ventilation amount and improve the speed of entering hydrogen chloride. The PH value in the reaction kettle 1 is controlled to be maintained within the set threshold value range through the design, so that the sufficient reaction of hydrochloric acid and hypochlorous acid in the dichloro mother solution can be ensured to generate cyanuric acid, and the generated cyanuric acid can be ensured to be crystallized and separated out.
In one embodiment of the present invention, the liquid level monitoring unit 14 includes a first liquid level sensor and a second liquid level sensor, where the first liquid level sensor and the second liquid level sensor are respectively installed at preset positions inside the reaction kettle 1, and the first liquid level sensor and the second liquid level sensor are both connected to the control unit.
For example, the first liquid level sensor is used for monitoring the highest liquid level in the reaction kettle 1, the second liquid level sensor is used for monitoring the lowest liquid level in the reaction kettle 1, when the liquid level in the reaction kettle 1 is higher than the highest liquid level, the control unit controls the fourth liquid pump 11 to reduce the speed of conveying the dichloro mother liquid or controls the first liquid pump 8 to increase the speed of extracting the dichloro mother liquid, and when the liquid level in the reaction kettle 1 is lower than the lowest liquid level, the control unit controls the fourth liquid pump 11 to increase the speed of conveying the dichloro mother liquid or reduces the speed of extracting the dichloro mother liquid by the first liquid pump 8, so that the dichloro mother liquid in the reaction kettle 1 can be maintained at a set amount, and stirring and chemical reaction in the reaction kettle 1 are facilitated.
In one embodiment of the invention, the control unit comprises a processor, a display unit and an input unit, wherein the display unit, the input unit, the stirring unit, the PH monitoring unit 18, the liquid level monitoring unit 14, the circulating pump 12, the electric valve 6, the centrifugal machine 4, the first liquid pump 8, the second liquid pump 9 and the third liquid pump 10 are all connected with the processor.
The input unit can input various action instructions to the processor, and the processor controls the stirring unit, the PH monitoring unit 18, the liquid level monitoring unit 14, the circulating pump 12, the electric valve 6, the centrifugal machine 4, the first liquid pump 8, the second liquid pump 9 and the third liquid pump 10 to act according to the input action instructions, so that the synthesis and recovery of cyanuric acid are realized.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (4)
1. A method for recycling cyanuric acid in dichloro mother liquor is characterized by comprising the following steps:
filling hydrogen chloride gas into a reaction kettle containing the dichloro mother solution, so that hypochlorous acid in the dichloro mother solution reacts with hydrochloric acid to generate cyanuric acid;
pouring the dichloro mother solution in the reaction kettle into an intermediate tank, and further reacting hypochlorous acid and hydrochloric acid in the dichloro mother solution to generate cyanuric acid;
pouring the dichloro mother liquor of the intermediate tank into a settling tank to settle cyanuric acid;
placing the sedimentation liquid in the sedimentation tank into a centrifuge, and separating out cyanuric acid for recycling;
the pH value of the dichloro mother liquor in the reaction kettle is 0.1-0.4;
the reaction kettle is provided with a stirring unit, and the stirring unit is used for stirring the dichloro mother solution in the reaction kettle;
the reaction kettle is provided with a circulating pump and a jet-suction pump, a liquid inlet of the circulating pump is connected with a first liquid outlet of the reaction kettle, a liquid outlet of the circulating pump is connected with a liquid inlet of the jet-suction pump, a gas inlet of the jet-suction pump is connected with a gas outlet of hydrogen chloride supply equipment, and a liquid outlet of the jet-suction pump is connected with the first liquid inlet of the reaction kettle.
2. The cyanuric acid recovery system in the dichloro mother liquor is characterized by comprising a reaction kettle, a middle tank, a settling tank, a centrifugal machine, an electric valve, a first liquid pump, a second liquid pump, a third liquid pump, a fourth liquid pump and a control unit;
the reaction kettle is provided with a stirring unit, a PH monitoring unit, a liquid level monitoring unit, a circulating pump and a jet-suction pump, wherein an air outlet at the top of the reaction kettle is connected with chlorine recovery equipment, a liquid inlet of the circulating pump is connected with a first liquid outlet of the reaction kettle, a liquid outlet of the circulating pump is connected with a liquid inlet of the jet-suction pump, an air inlet of the jet-suction pump is connected with an air outlet of a hydrogen chloride supply device through the electric valve, a liquid outlet of the jet-suction pump is connected with a first liquid inlet of the reaction kettle, a second liquid inlet of the reaction kettle is connected with a dichloro mother liquid supply device through the fourth liquid pump, a second liquid outlet of the reaction kettle is connected with a liquid inlet of the intermediate tank through the first liquid pump, a liquid outlet of the intermediate tank is connected with a liquid inlet of the sedimentation tank through the second liquid pump, a liquid outlet of the sedimentation tank is connected with the centrifugal machine through the third liquid pump, and the liquid level monitoring unit, the PH monitoring unit and the stirring unit are all arranged inside the reaction kettle;
the stirring unit, the PH monitoring unit, the liquid level monitoring unit, the circulating pump, the electric valve, the centrifugal machine, the first liquid pump, the second liquid pump, the third liquid pump and the fourth liquid pump are all connected with the control unit;
the stirring unit comprises a motor arranged at the top of the reaction kettle and a rotating shaft vertically arranged in the reaction kettle and provided with stirring blades, the shaft of the motor is connected with one end part of the rotating shaft, and the motor is connected with the control unit;
the PH monitoring unit is arranged at the bottom of the reaction kettle or in the pipeline between the reaction kettle and the first liquid pump.
3. The cyanuric acid recovery system in a dichloro mother solution according to claim 2, wherein the liquid level monitoring unit comprises a first liquid level sensor and a second liquid level sensor, the first liquid level sensor and the second liquid level sensor are respectively installed at preset positions inside the reaction kettle, and the first liquid level sensor and the second liquid level sensor are both connected with the control unit.
4. The cyanuric acid recovery system in a dichloro mother solution according to claim 2, wherein the control unit comprises a processor, a display unit and an input unit, and the display unit, the input unit, the stirring unit, the PH monitoring unit, the liquid level monitoring unit, the circulation pump, the electric valve, the centrifuge, the first liquid pump, the second liquid pump and the third liquid pump are all connected to the processor.
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| GB1487707A (en) * | 1974-02-15 | 1977-10-05 | Fmc Corp | Process for recovery of cyanuric acid from treated chlorinated mother liquor |
| CN1095715A (en) * | 1992-11-26 | 1994-11-30 | 化工研究院 | A kind of preparation method of trichloroisocyanuric acid |
| CN1958482A (en) * | 2006-11-06 | 2007-05-09 | 诸城泰盛化工有限公司 | Method for treating wastewater from production of chlorated fulminuric acid |
| CN102491565A (en) * | 2011-12-28 | 2012-06-13 | 烟台大学 | Method for recovering waste water from sodium dichloroisocyanurate production |
| CN102897948A (en) * | 2012-10-15 | 2013-01-30 | 河北冀衡化学股份有限公司 | Cleaning treatment technology for isopropyl chloride cyanuric acid production waste water |
| CN107021920A (en) * | 2016-08-12 | 2017-08-08 | 万华化学集团股份有限公司 | A kind of isocyanate polymeric catalyst and preparation method thereof, and its method for preparing PIC |
| CN209759349U (en) * | 2019-01-29 | 2019-12-10 | 河北兴飞化工有限公司 | System for recovering cyanuric acid in dichloro mother liquor |
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