CN104826364B - A kind of air scavenging method Waste Sulfuric Acid dechlorinator and Waste Sulfuric Acid chlorine removal methods - Google Patents
A kind of air scavenging method Waste Sulfuric Acid dechlorinator and Waste Sulfuric Acid chlorine removal methods Download PDFInfo
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- CN104826364B CN104826364B CN201510178908.6A CN201510178908A CN104826364B CN 104826364 B CN104826364 B CN 104826364B CN 201510178908 A CN201510178908 A CN 201510178908A CN 104826364 B CN104826364 B CN 104826364B
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Abstract
The invention discloses a kind of air scavenging method Waste Sulfuric Acid dechlorinator and Waste Sulfuric Acid chlorine removal methods, this device includes Waste Sulfuric Acid pump, Waste Sulfuric Acid tank, dechlorinator.It is an advantage of the invention that flow process is simple, does not use any antichlor, it is to avoid sulphuric acid is mixed into other impurity, loses its value；Additionally eliminate the chlorine of free state in Waste Sulfuric Acid, it is to avoid the pollution to environment.
Description
Technical field
The invention belongs to a kind of dry chlorine process and produce the processing method of Waste Sulfuric Acid, particularly relate to a kind of air scavenging method Waste Sulfuric Acid dechlorinator and chlorine removal methods.
Technical background
With a small amount of chlorine in the Waste Sulfuric Acid produced in the chlorine gas drying tower of ion film caustic soda, useless chlorinity is approximately 0.1～0.12%, and its free chlorine part is 0.07～0.08%, after volatilization, atmospheric pollution can be produced, the ruuning situation according to current process units, it is necessary to carry out Waste Sulfuric Acid dechlorination process.The Waste Sulfuric Acid produced in the big multipair ion film caustic soda chlorine treatment unit chlorine gas drying tower of existing enterprise carries out air scavenging, remove the chlorine of its free state, the waste chlorine that blowing process produces is absorbed by the harmful waste removing tower of chlorine treatment unit, generate sodium hypochlorite, prevent from Waste Sulfuric Acid from entering chlorine in storage tank process to overflow, cause environmental pollution.
But being currently used in the Waste Sulfuric Acid dechlorinator of air scavenging method, flat gripper shoe gas, liquid walk same passage, and gas, liquid flowing resistance are all very big, it is easy to forming liquid flooding, additionally filler easily occupies the position in hole, and effective passage is low.When supporting filler and the medium of same weight, there is required plate thickness big in bell-jar gripper shoe, investment is big, and the problem occupying the useful space of multitower.
On the other hand, due to problems such as filler arrangement are uneven or gas-liquid contact time is short, cause gas and make that consumption is big, deviate from the problems such as purity of chlorine gas feeding is low, extrusion rate is low.
Summary of the invention
For solving the problems referred to above, the invention provides a kind of Novel waste sulphuric acid dechlorinator, adopt the gas blowing type supporting plate of autonomous Design, it is aided with filler for flower ring, achieve effective elimination of the chlorine of free state in Waste Sulfuric Acid, there is separation efficiency height, gas usage few, the advantages such as tower top pressure is low.
To achieve these goals, the present invention adopts the following technical scheme that
A kind of air scavenging method uses Waste Sulfuric Acid dechlorinator, including tower body, described tower body vertical type cylinder, the bottom of tower body is provided with gas blowing type supporting plate, described tower body side is provided with waste liquid charging aperture, described tower body top is provided with gas outlet, it is provided with liquid outlet bottom described tower body, described gas blowing type supporting plate is annular back timber, the convex support system that radial stay and base plate surround, described radial stay is divided into jut and partes glabra, described protruding part is in radial stay bottom, described base plate and radial stay jut are provided with liquid outlet, described partes glabra is uniformly placed with gas ejection ports, described gas blowing type supporting plate is filled with filler for flower ring.
The gripper shoe of tower be packed tower main hold liquid zone, its flow resistance is big or redistributes bad, it is easy to causes liquid flooding, affects the separation efficiency of tower.The gas blowing type supporting plate of the present invention provides different passages for gas from liquid, and gas enters filler easily, and liquid can freely be discharged again, reduces liquid flooding probability.The concaveconvex shape of support plate, the probability making filler blocking gas orifice is only small.Gas is with the different radiation directions of fine strain of millet simultaneously, flows to all directions, forms turbulence, is more beneficial for the carrying out of mass transport process.
Preferably, described gas blowing type supporting plate top is provided with annular back timber, and is connected with base plate by many radial stays.Gas, with the different radiation directions of fine strain of millet, flows to all directions, forms turbulence, is more beneficial for the carrying out of mass transport process.
Preferably, the 1/2-3/4 that diameter is tower body diameter of described annular back timber.
Preferably, described radial stay is about tower body axis symmetry arrangement.
Preferably, described filler for flower ring is Flos Mume annular Taylor's filler for flower ring.Use Flos Mume annular Taylor's garland can have higher dispersed phase holdup due to the gap location of this filler, the Waste Sulfuric Acid time of staying in tower can being made longer, thus adding the time of contact of gas-liquid, using less amount of gas just can remove the chlorine of free state.Vent gas treatment is easy, it is to avoid cause secondary pollution.Gas makes consumption few simultaneously, and tower top pressure is low, and the chlorine being also beneficial to free state discharges from Waste Sulfuric Acid.
Preferably, described packed height is 1.8-2.0 rice.
Present invention also offers a kind of Waste Sulfuric Acid chlorine removal methods, Waste Sulfuric Acid enters from dechlorinator top, flow downward after being uniformly distributed by distributor, packing layer, compression air enters in dechlorinator bottom, Waste Sulfuric Acid is blown down, waste chlorine by dechlorinator top except after mist layer carries out acid-mist-removing, go out dechlorinator and enter harmful waste removing tower and carry out alkali liquor absorption；Waste Sulfuric Acid through blowing down flows into sulphuric acid tank bottom dechlorinator, is then delivered to Waste Sulfuric Acid storage tank, stand-by.
Preferably, described compressed air require 106-200m3/h。
Preferably, described Waste Sulfuric Acid flow velocity is 0.02m/s.
nullThe innovative point of the present invention: existing filler for flower ring is liquid extended residence time in packing layer，The mass transfer contact time can be increased，The more inwall space occupying packing layer of liquid simultaneously，Gas passage is necessarily made to become narrow and small、Tortuous，Add the turbulence of gas-liquid two-phase，It is also beneficial to mass transfer，But quiet liquid holdup can make dead band in tower increase，Effective mass transfer area reduces，Harmful effect to mass transfer，Therefore，Generally require by add air speed quiet liquid holdup is converted into dynamic liquid holdup，The requirement that low gas velocity runs cannot be met，And the gas blowing type supporting plate of the present invention，The support system of radial stay composition is added for annular back timber，Gas ejection ports uniformly it is placed with at high spot，Gas is with the different radiation directions of fine strain of millet，Flow to all directions，Form local microturbulent motion，It is more beneficial for quiet liquid holdup is converted into dynamic liquid holdup，Thus ensureing the mass-transfer efficiency of filler for flower ring under low flow velocity，Achieve the high efficiente callback of chlorine.
This technological process is that Waste Sulfuric Acid passes through sulphuric acid circulating pump entrance dechlorinator top, flow downward after being uniformly distributed by distributor, packing layer, compressed air enters in dechlorinator bottom, sulphuric acid is blown down, waste chlorine by dechlorinator top except after mist layer carries out acid-mist-removing, go out dechlorinator and enter harmful waste removing tower and carry out alkali liquor absorption.Waste Sulfuric Acid through blowing down flows into sulphuric acid tank bottom dechlorinator, is then pumped into Waste Sulfuric Acid storage tank with acid, and Waste Sulfuric Acid according to circumstances goes to produce chlorosulfonic acid.
In actual production, the compressed air require 106-200m of Waste Sulfuric Acid dechlorinator of the present invention3/ h, Waste Sulfuric Acid is 128s in the time of staying of desulfurizing tower.Waste Sulfuric Acid flow velocity is 0.02m/s, and packed height is 1.8 meters, and the present invention improves dechlorination efficiency more than 90%.Dechlorinator's top gas goes harmful waste removing tower to produce sodium hypochlorite, and the Waste Sulfuric Acid containing chemical combination state chlorine element according to circumstances goes to produce sulfacid.Deviate from the chlorine of free state according to the method for desulfurizing agent (conventional sodium thiosulfate), then in then Waste Sulfuric Acid, infiltrate impurity natrium ion, the value of Waste Sulfuric Acid recycling can be substantially reduced.
In Waste Sulfuric Acid, chlorinity is approximately 0.1～0.12%, and wherein can remove free chlorine part is 0.07～0.08%, and removal efficiency is 68.18%.The chlorine of chemical combination state will not to environment.
Beneficial effects of the present invention:
1. Waste Sulfuric Acid dechlorinator of the present invention achieves effective elimination of the chlorine of the free state in Waste Sulfuric Acid, has separation efficiency height, gas usage few, the advantages such as tower top pressure is low, device is simple.
2. it is an advantage of the invention that flow process is simple, does not use any antichlor, it is to avoid sulphuric acid is mixed into other impurity, loses its value；Additionally eliminate the chlorine of free state in Waste Sulfuric Acid, it is to avoid the pollution to environment.
3. gas blowing type supporting plate of the present invention adopts girder structure, on bearing strength and porosity, not only it is better than bell-type gripper shoe, and when supporting filler and the medium of same weight, the thickness possessing sheet material is little, take up room little, the advantage that production cost is low.
4. the gas blowing type supporting plate of the present invention provides different passages for gas from liquid, and gas enters filler easily, and liquid can freely be discharged again, reduces liquid flooding probability.The concaveconvex shape of support plate, the probability making filler blocking gas orifice is only small.Gas is with the different radiation directions of fine strain of millet simultaneously, flows to all directions, forms turbulence, is more beneficial for the carrying out of mass transport process.
5. Flos Mume annular Taylor garland gap location can have higher dispersed phase holdup, and the Waste Sulfuric Acid time of staying in tower can be made longer, thus adding the time of contact of gas-liquid, uses less amount of gas just can remove the chlorine of free state.Vent gas treatment is easy, it is to avoid cause secondary pollution.Gas makes consumption few simultaneously, and tower top pressure is low, and the chlorine being also beneficial to free state discharges from Waste Sulfuric Acid.
Accompanying drawing explanation
The process chart of Fig. 1 present invention.
Fig. 2 packed tower assembling schematic diagram.
Fig. 3 gas blowing type supporting plate top view.
Fig. 4 gas blowing type supporting plate gas-liquid channel figure.
Wherein, 1. tower body, 2. gas blowing type gripper shoe, 3. annular back timber, 4. radial stay, 5. gas ejection ports, 6. liquid outlet, 7. filler fill area.
Specific embodiment
Embodiment 1
A kind of air scavenging method uses Waste Sulfuric Acid dechlorinator, including tower body 1, described tower body 1 is vertical type cylinder, the bottom of tower body 1 is provided with gas blowing type supporting plate 2, described tower body 1 side is provided with waste liquid charging aperture, described tower body top is provided with gas outlet, it is provided with liquid outlet bottom described tower body, described gas blowing type supporting plate 2 is annular back timber 3, the convex support system that radial stay 4 and base plate surround, described radial stay 4 is divided into jut and partes glabra, described protruding part is in radial stay 4 bottom, described base plate and jut are provided with liquid outlet, described partes glabra is uniformly placed with gas ejection ports, described gas blowing type supporting plate is filled with filler for flower ring.
The gripper shoe of tower be packed tower main hold liquid zone, its flow resistance is big or redistributes bad, it is easy to causes liquid flooding, affects the separation efficiency of tower.The gas blowing type supporting plate of the present invention provides different passages for gas from liquid, and gas enters filler easily, and liquid can freely be discharged again, reduces liquid flooding probability.The concaveconvex shape of support plate, the probability making filler blocking gas orifice is only small.Gas is with the different radiation directions of fine strain of millet simultaneously, flows to all directions, forms turbulence, is more beneficial for the carrying out of mass transport process.
Embodiment 2
Gas blowing type supporting plate top is provided with annular back timber, and is connected with base plate by 10 radial stays, and other structures are identical with embodiment 1.Gas, with the different radiation directions of fine strain of millet, flows to all directions, forms turbulence, is more beneficial for the carrying out of mass transport process.
Embodiment 3
Diameter is tower body diameter the 1/2 of described annular back timber, other structures are identical with embodiment 1.
Embodiment 4
Diameter is tower body diameter the 3/4 of described annular back timber, other structures are identical with embodiment 1.
Embodiment 5
Described radial stay is about tower body axis symmetry arrangement, and other structures are identical with embodiment 1.
Embodiment 6
Described filler for flower ring is Flos Mume annular Taylor's filler for flower ring.Use Flos Mume annular Taylor's garland can have higher dispersed phase holdup due to the gap location of this filler, the Waste Sulfuric Acid time of staying in tower can being made longer, thus adding the time of contact of gas-liquid, using less amount of gas just can remove the chlorine of free state.Vent gas treatment is easy, it is to avoid cause secondary pollution.Gas makes consumption few simultaneously, and tower top pressure is low, and the chlorine being also beneficial to free state discharges from Waste Sulfuric Acid.
Embodiment 7
This technological process is that Waste Sulfuric Acid passes through sulphuric acid circulating pump entrance dechlorinator top, flow downward after being uniformly distributed by distributor, packing layer, compressed air enters in dechlorinator bottom, sulphuric acid is blown down, waste chlorine by dechlorinator top except after mist layer carries out acid-mist-removing, go out dechlorinator and enter harmful waste removing tower and carry out alkali liquor absorption.Waste Sulfuric Acid through blowing down flows into sulphuric acid tank bottom dechlorinator, is then pumped into Waste Sulfuric Acid storage tank with acid, and Waste Sulfuric Acid according to circumstances goes to produce chlorosulfonic acid.
In actual production, the compressed air require 106-200m of Waste Sulfuric Acid dechlorinator of the present invention3/ h, Waste Sulfuric Acid is 128s in the time of staying of desulfurizing tower.Waste Sulfuric Acid flow velocity is 0.02m/s, and packed height is 1.8 meters, and compared with existing dechlorinator, dechlorination efficiency of the present invention improves more than 90%, and free chlorine removal efficiency reaches more than 99.9%, and total dechlorination rate reaches more than 68.18%.Dechlorinator's top gas goes harmful waste removing tower to produce sodium hypochlorite, and the Waste Sulfuric Acid containing chemical combination state chlorine element according to circumstances goes to produce sulfacid.Deviate from the chlorine of free state according to the method for desulfurizing agent (conventional sodium thiosulfate), then in then Waste Sulfuric Acid, infiltrate impurity natrium ion, the value of Waste Sulfuric Acid recycling can be substantially reduced.
In Waste Sulfuric Acid, chlorinity is approximately 0.1～0.12%, and wherein can remove free chlorine part is 0.07～0.08%, and total dechlorination rate reaches more than 68.18%.The chlorine of chemical combination state will not to environment.
Claims (9)
1. an air scavenging method uses Waste Sulfuric Acid dechlorinator, including tower body, described tower body is vertical type cylinder, the bottom of tower body is provided with gas blowing type supporting plate, described tower body side is provided with waste liquid charging aperture, described tower body top is provided with gas outlet, it is provided with liquid outlet bottom described tower body, it is characterized in that, described gas blowing type supporting plate is annular back timber, the convex support system that radial stay and base plate surround, described radial stay is divided into jut and partes glabra, described protruding part is in radial stay bottom, described base plate and jut are provided with liquid outlet, described partes glabra is uniformly placed with gas ejection ports, described gas blowing type supporting plate is filled with filler for flower ring.
2. Waste Sulfuric Acid dechlorinator as claimed in claim 1, it is characterised in that described gas blowing type supporting plate top is provided with annular back timber, and is connected with base plate by many radial stays.
3. Waste Sulfuric Acid dechlorinator as claimed in claim 1, it is characterised in that the 1/2-3/4 that diameter is tower body diameter of described annular back timber.
4. Waste Sulfuric Acid dechlorinator as claimed in claim 1, it is characterised in that described radial stay is about tower body axis symmetry arrangement.
5. Waste Sulfuric Acid dechlorinator as claimed in claim 1, it is characterised in that described filler for flower ring is Flos Mume annular Taylor's filler for flower ring.
6. Waste Sulfuric Acid dechlorinator as claimed in claim 1, it is characterised in that described packed height is 1.8-2.0 rice.
7. a Waste Sulfuric Acid chlorine removal methods, it is characterized in that, Waste Sulfuric Acid dechlorinator described in any one of claim 1-6 runs, Waste Sulfuric Acid enters from dechlorinator top, flowing downward after being uniformly distributed by distributor, packing layer, compression air enters in dechlorinator bottom, and Waste Sulfuric Acid is blown down, waste chlorine by dechlorinator top except after mist layer carries out acid-mist-removing, go out dechlorinator and enter harmful waste removing tower and carry out alkali liquor absorption；Waste Sulfuric Acid through blowing down flows into sulphuric acid tank bottom dechlorinator, is then delivered to Waste Sulfuric Acid storage tank, stand-by.
8. the method described in claim 7, it is characterised in that described compressed air require 106-200m3/h。
9. method as claimed in claim 7, it is characterised in that described Waste Sulfuric Acid flow velocity is 0.02m/s.
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| CN106044723B (en) * | 2016-05-31 | 2018-07-06 | 安徽八一化工股份有限公司 | The method for removing free chlorine in the Waste Sulfuric Acid that dry chlorine process generates |
| CN106276816B (en) * | 2016-08-15 | 2018-06-12 | 新疆中泰创安环境科技股份有限公司 | The vacuum dechlorination method of purification and its dedicated unit of ion film caustic soda by-product dilute sulfuric acid |
| CN106186135A (en) * | 2016-08-30 | 2016-12-07 | 安徽八化工股份有限公司 | Waste sulfuric acid containing chlorine dechlorination apparatus |
| CN106517104A (en) * | 2016-12-13 | 2017-03-22 | 攀枝花钢企欣宇化工有限公司 | Method for removing free chlorines from waste industrial sulfuric acid |
| CN108059132A (en) * | 2017-12-24 | 2018-05-22 | 江苏梅兰化工有限公司 | A kind of chloride Waste Sulfuric Acid recycling and processing device and processing method |
| CN110386654A (en) * | 2018-04-23 | 2019-10-29 | 湖南能也科技发展有限公司 | A method of removing chlorine from waste acid |
| CN108786378A (en) * | 2018-07-10 | 2018-11-13 | 四川永祥股份有限公司 | A kind of sulfuric acid cycle dechlorinator, dechlorination system and dechlorination method |
| CN110294461B (en) * | 2019-07-09 | 2023-12-05 | 浙江工程设计有限公司 | Adjustable sulfuric acid dechlorination process and dechlorination tower |
| CN112694069A (en) * | 2020-12-27 | 2021-04-23 | 江苏梅兰化工有限公司 | Method and device for removing free chlorine in waste sulfuric acid |
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| DE2522286C3 (en) * | 1975-05-20 | 1978-05-18 | Hoechst Ag, 6000 Frankfurt | Process for the purification of crude hydrogen chloride |
| JP4854335B2 (en) * | 2006-03-07 | 2012-01-18 | 住友化学株式会社 | How to remove chlorine |
| CN101367507B (en) * | 2007-08-17 | 2012-07-11 | 新疆石河子中发化工有限责任公司 | Gas removing, filtering and extracting method for waste sulphuric acid |
| CN201752589U (en) * | 2010-07-30 | 2011-03-02 | 金川集团有限公司 | Dechlorination tower |
| CN203935643U (en) * | 2014-07-03 | 2014-11-12 | 温州浮士达佑利流体系统有限公司 | Diluted acid dechlorinator |
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