CN112694069A - Method and device for removing free chlorine in waste sulfuric acid - Google Patents
Method and device for removing free chlorine in waste sulfuric acid Download PDFInfo
- Publication number
- CN112694069A CN112694069A CN202011571009.XA CN202011571009A CN112694069A CN 112694069 A CN112694069 A CN 112694069A CN 202011571009 A CN202011571009 A CN 202011571009A CN 112694069 A CN112694069 A CN 112694069A
- Authority
- CN
- China
- Prior art keywords
- dechlorination
- sulfuric acid
- storage tank
- waste sulfuric
- circulating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/90—Separation; Purification
Abstract
The invention discloses a device for removing free chlorine in waste sulfuric acid, which comprises a dilute acid storage tank (1), a circulating storage tank (2), a dechlorination circulating pump (3), a dechlorination tower (4), a dechlorination blower (5), a chlorine gas absorption circulating tank (6), an absorption circulating pump (7), a finished product dilute acid tank (8) and a finished product circulating pump (9). The invention also discloses a method for removing free chlorine in the waste sulfuric acid, firstly, drying 75 percent of the waste sulfuric acid by chlorine, and pumping the dried waste sulfuric acid into a dilute acid storage tank (1) or a circulating storage tank (2) for storage by a pump; secondly, the chlorine in the waste sulfuric acid is removed after the dried waste sulfuric acid stored in the dilute acid storage tank (1) or the circulating storage tank (2) is reversely contacted, and the qualified dechlorinated dilute sulfuric acid is discharged into the circulating storage tank (2) through a sampling port (12) to be directly sold or prepared into 93 percent acid for self use; and step three, absorbing the chlorine gas removed in the step two.
Description
Technical Field
The invention relates to a method and a device for removing free chlorine in waste sulfuric acid.
Background
In the current chlorine treatment process of the ionic membrane caustic soda device, about 7000 tons of waste sulfuric acid with the concentration of about 75% is generated every year, and the waste sulfuric acid dissolves chlorine gas with the concentration of 1100PPm, chloride ions with the concentration of 470PPm, and a small amount of suspended matters and mechanical impurities. The waste sulfuric acid containing more than 1000PPm of chlorine according to the relevant standard of hazardous waste records is required to be treated as hazardous waste, so that 140 RMB of treatment factories are required to be subsidized every year, and the part of the waste sulfuric acid is required to be treated and recycled. At present, the concentration and purification technology is generally adopted at home and abroad to treat dilute sulfuric acid containing impurities, namely, the low-concentration waste sulfuric acid after impurity removal is concentrated into high-concentration commodity acid by different methods for recycling. The applied concentration technology mainly comprises a high-temperature combustion concentration technology, a vacuum concentration technology and a multi-effect evaporation concentration technology. But the equipment investment is huge, the operation cost is high, and the applicability is poor.
Disclosure of Invention
The invention provides a method and a device for removing free chlorine in waste sulfuric acid, wherein the method and the device remove the free chlorine in the waste sulfuric acid by a nitrogen blowing method, have simple process, simple and convenient operation, low investment and relatively low operation cost, and simultaneously can not form secondary pollution.
The invention adopts the following technical scheme: a device for removing free chlorine in waste sulfuric acid comprises a dilute acid storage tank, a circulating storage tank, a dechlorination circulating pump, a dechlorination tower, a dechlorination blower, a chlorine absorption circulating tank, an absorption circulating pump, a finished product dilute acid tank and a finished product circulating pump, wherein an inlet of the dilute acid storage tank is communicated with a dilute acid storage device, an outlet of the dilute acid storage tank and an outlet of the circulating storage tank are communicated with an input port of the dechlorination circulating pump, a nitrogen storage chamber is arranged at the bottom of the dechlorination tower, a sampling port is also arranged at the bottom of the dechlorination tower and is communicated with the top of the circulating storage tank, an output port of the dechlorination circulating pump is divided into a branch I, a branch II, a branch III and a branch IV, an output port of the dechlorination circulating pump is communicated with an inlet on tower side face, an output port of the dechlorination circulating pump is communicated with an inlet, the branch III is communicated with a backflow port of the dilute acid storage tank through an output port of the dechlorination circulating pump, the branch IV is communicated with a backflow port of the circulating storage tank through an output port of the dechlorination circulating pump, an air outlet of the dechlorination air blower is communicated with an air inlet of the dechlorination tower through an air filter, a silencer is arranged on the dechlorination air blower, an outlet at the top of the dechlorination tower is communicated with an input port I of the water flow ejector, a liquid outlet at the lower part of the side surface of the chlorine absorption circulating tank is communicated with an inlet of the absorption circulating pump, and an outlet of.
The bottom of the dilute acid storage tank is connected with a blow-down valve I, and a valve I is arranged between an outlet of the dilute acid storage tank and an input port of the dechlorination circulating pump. And a valve II is arranged between the outlet of the circulating storage tank and the input port of the dechlorination circulating pump.
And a valve III is arranged between the output port of the dechlorination circulating pump and the inlet on the side surface of the dechlorination tower.
And a valve IV is arranged between the output port of the dechlorination circulating pump and the inlet of the finished product dilute acid tank.
And a valve V is arranged between the output port of the dechlorination circulating pump and the return port of the dilute acid storage tank. And a valve VI is arranged between the output port of the dechlorination circulating pump and the return port of the circulating storage tank. And a valve VII is arranged between a liquid outlet at the lower part of the side surface of the chlorine absorption circulating groove and an inlet of the absorption circulating pump, and a blow-down valve II is arranged at the bottom of the chlorine absorption circulating groove.
The invention relates to a method for removing free chlorine in waste sulfuric acid, which comprises the following steps: firstly, drying 75% waste sulfuric acid in a dilute acid storage device through chlorine, and pumping the dried waste sulfuric acid into a dilute acid storage tank or a circulating storage tank through a pump for storage; secondly, pumping part of the dried waste sulfuric acid stored in a dilute acid storage tank or a circulating storage tank into a finished product dilute acid tank directly through a dechlorination circulating pump, inputting the other part of the waste sulfuric acid into a dechlorination tower through a dechlorination circulating pump, spraying the waste sulfuric acid input into the dechlorination tower to be in reverse contact with nitrogen entering from the lower part of the dechlorination tower, removing chlorine in the waste sulfuric acid after the reverse contact, and discharging the qualified dilute sulfuric acid after dechlorination into the circulating storage tank through a sampling port to be directly sold or prepared into 93% acid for self use; and step three, sending the chlorine gas removed in the step two into a water flow ejector, pumping the dilute alkali solution discharged from the chlorine gas absorption circulating tank into the water flow ejector through an absorption circulating pump, mixing with the chlorine gas, and then spraying the mixture into the chlorine gas absorption circulating tank to absorb the chlorine gas.
In the second step of the invention, nitrogen is introduced by adopting a purging mode, the purging time is determined by the amount of the waste sulfuric acid and the flow rate of the nitrogen, when 15 tons of waste sulfuric acid is treated, the flow rate of the nitrogen is 3.5m3/h, and the purging time is 8 hours, so that the free chlorine in the waste sulfuric acid can be reduced to below 50 PPm.
The invention has the following beneficial effects: after the technical scheme is adopted, the device provided by the invention has the advantages that the operation is stable, the device is economical and feasible, and the free chlorine in the waste sulfuric acid is removed, so that the aim of recycling is fulfilled. The invention adopts nitrogen or compressed air to circularly blow the waste sulfuric acid containing chlorine to remove free chlorine, and the blown free chlorine is circularly absorbed by alkali. The blowing time of the invention is determined by the amount of the waste sulfuric acid and the flow of the nitrogen, 15 tons of waste sulfuric acid is treated, the flow of the nitrogen is 3.5m3/h, the blowing is generally carried out for 8 hours, the free chlorine in the waste acid can be reduced to below 50PPm, thus avoiding the blackening of the sulfuric acid caused by overlong time and the carbonization of the sulfuric acid caused by a small amount of oil carried in the nitrogen. When the pH value of the absorption liquid reaches 7-8 after detection, the dilute alkali solution is recycled, so that the air pollution is reduced to the minimum. The method for removing the free chlorine in the waste sulfuric acid by adopting the nitrogen blowing method has the advantages of simple process, simple and convenient operation, low investment, relatively low operation cost and no secondary pollution. After treatment, the free chlorine in the waste sulfuric acid is reduced to below 50PPm from 1100PPm, and the cost is saved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
In figure 1, the invention provides a device for removing free chlorine in waste sulfuric acid, which comprises a dilute acid storage tank 1, a circulating storage tank 2, a dechlorination circulating pump 3, a dechlorination tower 4, a dechlorination blower 5, a chlorine absorption circulating tank 6, an absorption circulating pump, a finished product dilute acid tank 8 and a finished product circulating pump 9, wherein an inlet of the dilute acid storage tank 1 is communicated with a dilute acid storage device 10, an outlet of the dilute acid storage tank 1 and an outlet of the circulating storage tank 2 are communicated with an inlet of the dechlorination circulating pump 3, a nitrogen storage chamber 11 is arranged at the bottom of the dechlorination tower 4, a sampling port 12 is also arranged at the bottom of the dechlorination tower 4, the sampling port 12 is communicated with the top of the circulating storage tank 2, an outlet of the dechlorination circulating pump 3 is divided into a branch I, a branch II, a branch III and a branch IV, an outlet of the dechlorination circulating pump 3 is communicated with an inlet on tower 4 side, an outlet of the branch II is communicated, a finished product circulating pump 9 is connected with an outlet of a finished product dilute acid tank 8, a branch III is formed by communicating an output port of a dechlorination circulating pump 3 with a backflow port of a dilute acid storage tank 1, a branch IV is formed by communicating an output port of the dechlorination circulating pump 3 with a backflow port of a circulating storage tank 2, an air outlet of a dechlorination air blower 5 is communicated with an air inlet of a dechlorination tower 4 through an air filter 14, a silencer 15 is arranged on the dechlorination air blower 5, an outlet at the top of the dechlorination tower 4 is communicated with an input port I of a water flow ejector 16, a liquid outlet at the lower part of the side surface of a chlorine absorption circulating tank 6 is communicated with an inlet of the absorption circulating pump 7, an outlet of the absorption circulating pump 7 is communicated with an input port II of the water flow ejector 16, a blow-down valve I17 is connected with the bottom of the dilute acid storage tank 1, a valve I18 is arranged between, dechlorination circulating pump 3's delivery outlet and the import of dechlorination tower 4 side between be equipped with valve III 20, dechlorination circulating pump 3's delivery outlet and finished product dilute acid tank 8's import between be equipped with valve IV 21, dechlorination circulating pump 3's delivery outlet and dilute acid storage tank 1's backward flow mouth between be equipped with valve V22, dechlorination circulating pump 3's delivery outlet and circulation storage tank 2's backward flow mouth between be equipped with valve VI 23, chlorine absorption circulating tank 6's the liquid outlet of side lower part and absorption circulating pump 7's import between be equipped with valve VII 24, chlorine absorption circulating tank 6's bottom is equipped with blowoff valve II 13.
The invention discloses a method for removing free chlorine in waste sulfuric acid by using a device, which comprises the following steps: firstly, drying 75% of waste sulfuric acid in a dilute acid storage device 10 by using chlorine, and pumping the dried waste sulfuric acid into a dilute acid storage tank 1 or a circulating storage tank 2 by using a pump for storage; secondly, pumping part of the dried waste sulfuric acid stored in the dilute acid storage tank 1 or the circulating storage tank 2 into a finished product dilute acid tank 8 directly through a dechlorination circulating pump 3, inputting the other part of the waste sulfuric acid into a dechlorination tower 4 through the dechlorination circulating pump 3, spraying the waste sulfuric acid input into the dechlorination tower 4 to be in reverse contact with nitrogen entering from the lower part of the dechlorination tower 4, introducing the nitrogen in a purging mode, wherein the purging time is determined by the amount of the waste sulfuric acid and the flow of the nitrogen, when 15 tons of waste sulfuric acid are treated, the flow of the nitrogen is 3.5m3/h, and the purging time is 8 hours, so that free chlorine in the waste sulfuric acid can be reduced to below 50PPm,
chlorine in the waste sulfuric acid is removed after reverse contact, and qualified dilute sulfuric acid after dechlorination is discharged into a circulating storage tank 2 through a sampling port 12 to be directly sold or prepared into 93 percent acid for self use; and step three, feeding the chlorine gas removed in the step two into a water flow ejector 16, pumping the dilute alkali solution discharged from the chlorine gas absorption circulating tank 6 into the water flow ejector 16 through an absorption circulating pump 7, mixing the chlorine gas with the chlorine gas, and then spraying the mixed solution into the chlorine gas absorption circulating tank 6 to absorb the chlorine gas, and performing recovery treatment when the pH value of the dilute alkali solution reaches 7-8 by detection, so that the air pollution is reduced to the minimum. In the invention, the higher the temperature of the waste sulfuric acid is, the better the dechlorination effect is, but the requirements on the material of the equipment are higher, so the comprehensive consideration is to select the normal temperature.
Claims (10)
1. A device for removing free chlorine in waste sulfuric acid is characterized by comprising a dilute acid storage tank (1), a circulating storage tank (2), a dechlorination circulating pump (3), a dechlorination tower (4), a dechlorination air blower (5), a chlorine gas absorption circulating tank (6), an absorption circulating pump (7), a finished product dilute acid tank (8) and a finished product circulating pump (9), wherein an inlet of the dilute acid storage tank (1) is communicated with a dilute acid storage device (10), an outlet of the dilute acid storage tank (1) and an outlet of the circulating storage tank (2) are communicated with an inlet of the dechlorination circulating pump (3), a nitrogen storage chamber (11) is arranged at the bottom of the dechlorination tower (4), a sampling port (12) is also arranged at the bottom of the dechlorination tower (4), the sampling port (12) is communicated with the top of the circulating storage tank (2), an outlet of the dechlorination circulating pump (3) is divided into a branch I, a, the branch I is communicated with an inlet on the side surface of the dechlorination tower (4) through an output port of the dechlorination circulating pump (3), the branch II is communicated with an inlet of the finished product dilute acid tank (8) through an output port of the dechlorination circulating pump (3), the outlet of the finished product dilute acid tank (8) is connected with the finished product circulating pump (9), the branch III is communicated with a backflow port of the dilute acid storage tank (1) through an output port of the dechlorination circulating pump (3), the branch IV is communicated with a backflow port of the circulating storage tank (2) through an output port of the dechlorination circulating pump (3), an air outlet of the dechlorination blower (5) is communicated with an air inlet of the dechlorination tower (4) through an air filter (14), a silencer (15) is arranged on blower (5), an outlet on the top of the dechlorination tower (4) is communicated with an input port I of a water flow ejector (16), and a liquid outlet on port on, the outlet of the absorption circulating pump (7) is communicated with the input port II of the water flow ejector (16).
2. The device for removing the free chlorine in the waste sulfuric acid as claimed in claim 1, wherein the bottom of the dilute acid storage tank (1) is connected with a blowdown valve I (17), and a valve I (18) is arranged between the outlet of the dilute acid storage tank (1) and the input of the dechlorination circulating pump (5).
3. The apparatus for removing free chlorine from waste sulfuric acid as claimed in claim 1, wherein a valve II (19) is arranged between the outlet of the circulating storage tank (2) and the input of the dechlorination circulating pump (3).
4. The apparatus for removing free chlorine from waste sulfuric acid as claimed in claim 1, wherein a valve III (20) is provided between the output of the dechlorination circulating pump (3) and the inlet of the side of the dechlorination tower (4).
5. The apparatus for removing free chlorine from waste sulfuric acid as claimed in claim 1, wherein a valve IV (21) is arranged between the output of the dechlorination circulating pump (3) and the inlet of the finished product dilute acid tank (8).
6. The device for removing the free chlorine in the waste sulfuric acid as claimed in claim 1, wherein a valve V (22) is arranged between the output port of the dechlorination circulating pump (3) and the return port of the dilute acid storage tank (1).
7. The device for removing the free chlorine in the waste sulfuric acid as claimed in claim 1, wherein a valve VI (23) is arranged between the output port of the dechlorination circulating pump (3) and the return port of the circulating storage tank (2).
8. The device for removing the free chlorine in the waste sulfuric acid as claimed in claim 1, wherein a valve VII (24) is arranged between a liquid outlet at the lower part of the side surface of the chlorine gas absorption circulating tank (6) and an inlet of the absorption circulating pump (7), and a blow-down valve II (13) is arranged at the bottom of the chlorine gas absorption circulating tank (6).
9. A method for removing free chlorine in waste sulfuric acid is characterized by comprising the following steps:
firstly, drying 75% of waste sulfuric acid in a dilute acid storage device (10) through chlorine, and pumping the dried waste sulfuric acid into a dilute acid storage tank (1) or a circulating storage tank (2) through a pump for storage;
secondly, pumping part of the dried waste sulfuric acid stored in the dilute acid storage tank (1) or the circulating storage tank (2) into a finished product dilute acid tank (8) directly through a dechlorination circulating pump (3), inputting the other part of the waste sulfuric acid into a dechlorination tower (4) through the dechlorination circulating pump (3), spraying the waste sulfuric acid input into the dechlorination tower (4) to be in reverse contact with nitrogen entering from the lower part of the dechlorination tower (4), removing chlorine in the waste sulfuric acid after the reverse contact, and discharging the qualified dilute sulfuric acid after dechlorination into the circulating storage tank (2) through a sampling port (12) to be sold directly or prepared into 93% acid for use;
and step three, sending the chlorine gas removed in the step two into a water flow ejector (16), pumping the dilute alkali solution discharged from the chlorine gas absorption circulating tank (6) into the water flow ejector (16) through an absorption circulating pump (7), mixing with the chlorine gas, and then spraying the mixture into the chlorine gas absorption circulating tank (6) to absorb the chlorine gas.
10. The method for removing free chlorine from waste sulfuric acid as claimed in claim 1, wherein the nitrogen gas is introduced in step two by means of purging, the purging time is determined by the amount of waste sulfuric acid and the flow rate of nitrogen gas, when 15 tons of waste sulfuric acid is treated, the flow rate of nitrogen gas is 3.5m3/h, and the purging time is 8 hours, so that the free chlorine in the waste sulfuric acid can be reduced to below 50 PPm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011571009.XA CN112694069A (en) | 2020-12-27 | 2020-12-27 | Method and device for removing free chlorine in waste sulfuric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011571009.XA CN112694069A (en) | 2020-12-27 | 2020-12-27 | Method and device for removing free chlorine in waste sulfuric acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112694069A true CN112694069A (en) | 2021-04-23 |
Family
ID=75511147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011571009.XA Pending CN112694069A (en) | 2020-12-27 | 2020-12-27 | Method and device for removing free chlorine in waste sulfuric acid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112694069A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115159462A (en) * | 2022-07-21 | 2022-10-11 | 宜宾海丰和锐有限公司 | Chlorine drying method for chlor-alkali production process |
-
2020
- 2020-12-27 CN CN202011571009.XA patent/CN112694069A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115159462A (en) * | 2022-07-21 | 2022-10-11 | 宜宾海丰和锐有限公司 | Chlorine drying method for chlor-alkali production process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108128953B (en) | Waste gas and wastewater treatment device and method for recycling and cracking waste lithium batteries | |
| CN101016175B (en) | Method of eliminating magnesium sulfate from magnesium sulfate containing waste water solution | |
| CN104402156B (en) | Special-purpose equipment for coal chemical high brine purification, evaporative crystallization and recovery technology | |
| CN207986863U (en) | A kind of waste acid resourceization utilizes processing system | |
| CN106145047A (en) | The system and method that ozone preparation and circulation of tail gas utilize | |
| CN101367507A (en) | Gas removing, filtering and extracting method for waste sulphuric acid | |
| CN107162281A (en) | The processing method and Waste Water Treatment of heavy metal ion in a kind of removal smelting wastewater | |
| CN109319876A (en) | A kind of resin adsorption method processing acetic acid waster water process | |
| CN102992351A (en) | Method and device for purifying ammonia recovered from coal chemical industry wastewater | |
| CN111330412B (en) | System and process for absorbing and purifying byproduct hydrogen chloride gas in chlorination section into acid | |
| CN110813047A (en) | Carbon dioxide capture pretreatment system and method | |
| CN108975570A (en) | A kind of device and method handling industrially desulfurized waste water using stack gases | |
| CN113461199A (en) | Method and system for separating sodium carbonate and sodium bromide from PTA (pure terephthalic acid) oxidation tail gas washing tower discharge liquid | |
| CN113979568B (en) | Arsenic removal treatment process for high-arsenic strong-acid wastewater | |
| CN112694069A (en) | Method and device for removing free chlorine in waste sulfuric acid | |
| CN109157964A (en) | A kind of viscose rayon waste gas absorbing system and method | |
| CN211226612U (en) | Integrated treatment device for removing hydrogen sulfide in landfill leachate | |
| CN215855122U (en) | Device for removing free chlorine in waste sulfuric acid | |
| CN209735299U (en) | novel circulating exhaust-gas treatment equipment | |
| CN217732690U (en) | Retrieve gaseous device of different concentration SO2 in follow waste liquid | |
| CN217230296U (en) | Structure for removing toxic gas from wastewater by utilizing degassing membrane group | |
| CN101503257B (en) | Method and apparatus for recovering and treating ammonium nitrate condensate liquid wastewater | |
| CN107758964B (en) | System for treating waste alkali liquid and treatment method thereof | |
| CN105016552B (en) | A kind of processing method of oil refinery spent lye | |
| CN213668265U (en) | Recovery processing device of waste sulfuric acid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |