CN212492318U - Tail gas absorption device in air-blowing bromine production - Google Patents
Tail gas absorption device in air-blowing bromine production Download PDFInfo
- Publication number
- CN212492318U CN212492318U CN201922291056.8U CN201922291056U CN212492318U CN 212492318 U CN212492318 U CN 212492318U CN 201922291056 U CN201922291056 U CN 201922291056U CN 212492318 U CN212492318 U CN 212492318U
- Authority
- CN
- China
- Prior art keywords
- buffer tank
- alkali
- washing tower
- tail gas
- alkaline
- 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.)
- Active
Links
Images
Landscapes
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
A tail gas absorption device and a tail gas absorption method in air-blown bromine production are used in the air-blown bromine production. The method is characterized in that two stages of alkaline washing absorption towers are arranged, liquid caustic soda absorption liquid automatically flows to the absorption towers from a high-level buffer tank by utilizing liquid level difference for spraying, the absorbed liquid caustic soda enters an alkaline liquor circulating tank and is pumped to a top buffer tank, and circulating absorption is realized; the pipe diameter of the liquid caustic soda circulation pipeline is larger than that of the spraying liquid caustic soda pipeline, so that the amount of circulating liquid caustic soda in the buffer tank is larger than the self-flow amount, the liquid caustic soda in the buffer tank is ensured to be sufficient, and when the liquid caustic soda in the buffer tank is fully stored, the liquid caustic soda returns to the circulation tank through a bypass overflow port. By utilizing the liquid level difference, the alkali washing absorption tower still keeps a normal operation state after power failure, the problem that the circulating pump stops operating to cause large amount of exhaust gas to be exhausted to pollute air before transformation can be avoided, and meanwhile, part of product loss can be avoided.
Description
Technical Field
The utility model relates to an in the air production of blowing bromine, tail gas absorption tower transformation realizes still can normal operating device after the urgent power failure.
Background
Bromine is a reddish brown liquid of the formula Br2Relative density 3.119(20 deg.C), boiling point 58.78 deg.C, easy volatilization, strong corrosiveness, slightly soluble in water, easily soluble in ethanol, diethyl ether, chloroform, carbon tetrachloride, kerosene and carbon disulfide, and soluble in hydrochloric acid, hydrobromic acid and bromine compound solution. Bromine is an important chemical raw material and has wide application in the industries of flame retardants, fire extinguishing agents, refrigerants, photosensitive materials, medicines, pesticides, oil fields and the like.
Acid-process air-blown bromine is a method for producing bromine, and most of domestic production enterprises adopt acid-process air-blown bromine at present. The main process is to acidify the sea water or bittern with low bromine content, oxidize with chlorine, desorb with air in a blow-off tower, and blow off free bromine Br 2. Then sulfur dioxide is used for absorption in an absorption tower, bromine is enriched to form intermediate product absorption completion liquid, and finally the intermediate product absorption completion liquid is distilled, cooled and separated by a distillation tower to prepare the finished bromine product.
Under the acidic condition, the bromide ions in the seawater are oxidized by chlorine gas to generate bromine molecules, and the reaction formula is as follows:
2Br-+Cl2→Br2+2Cl-
the free bromine is blown out by air, and the blown bromine-containing air is absorbed by a sulfur dioxide absorbent to prepare HBr finished liquid, and the reaction formula is as follows:
SO2+2H2O+Br2→H2SO4+2HBr
adding chlorine into the finished solution, and dissociating bromine, wherein the reaction formula is as follows:
2HBr+Cl2→Br2+2HCl
the distillation step is a process of separating bromine oxidized into molecules from the waste liquid, that is, a process of heating two or more substances and separating a mixture by utilizing the difference in boiling points of the components. The boiling point of bromine is 58.78 deg.C, and due to the difference in boiling points, when the distillation column is heated to a certain temperature, bromine with a low boiling point is changed into steam and discharged from the top of the column, and waste liquid with a high boiling point is discharged from the bottom of the column. And condensing and separating bromine gas discharged from the tower top to obtain a finished bromine product.
The tail gas of the distillation process comprises non-condensable gas discharged from a distillation tower, a condenser and a separation bottle, and the main substance is Br2、Cl2And SO2. In order to ensure that the tail gas in the distillation process reaches the standard and is discharged, the tail gas is absorbed by an acid washing device and an alkali washing device. Wherein the acid cleaning takes HBr-containing mother liquor as absorption liquid to absorb bromine and a small amount of Cl in gas2And SO2And the absorption liquid (namely HBr mother liquid) is discharged from the bottom of the acid washing and recovering device and enters an oxidation distillation tower. The alkaline washing uses sodium hydroxide solution as absorption liquid, part of tail gas remained after the acid washing is added through the spraying of the tower top and is discharged to an alkaline liquor circulating tank (5 m) from the bottom of a recovery device3) And then pumping the mixture to an absorption tower for circulating absorption.
However, the method has the defects that after the device is emergently stopped, the tail gas cannot be effectively recycled in the alkali washing process because the sodium hydroxide cannot be continuously added in the alkali washing part, so that a large amount of tail gas is discharged, and the environment is polluted.
Disclosure of Invention
The utility model overcomes prior art's is not enough, provides an air and blows absorbent device of tail gas and method in bromine production, effectively solves distillation evacuation tail gas after emergency power failure, the environmental protection problem that acid gas evacuation led to the fact to the atmosphere to realize fully absorbing.
The utility model discloses a solve the technical scheme that technical problem that exists among the well-known technique took and be:
a tail gas absorption device in air-blowing bromine production comprises a tail gas absorption tower, an alkaline washing tower, an alkaline solution tank and a connected pipeline, wherein the tail gas absorption tower and the alkaline washing tower are connected in series, tail gas is discharged from the top of the tail gas absorption tower and enters the alkaline washing tower from the bottom, a discharge outlet at the bottom of the alkaline washing tower is connected with the alkaline solution tank, the tail gas absorption tower comprises an alkaline solution buffer tank, the alkaline solution buffer tank is connected with the alkaline washing tower and the alkaline solution tank through the pipeline, the alkaline solution buffer tank is provided with a buffer tank inlet and a buffer tank outlet, the buffer tank inlet is arranged at the top of the alkaline solution buffer tank and is connected to the bottom of the alkaline solution tank through the pipeline, and a circulating pump is arranged; the outlet of the buffer tank is arranged at the bottom of the alkali liquor buffer tank and is connected to the top of the alkaline washing tower through a pipeline; the alkali liquor buffer tank is also provided with an overflow port, is arranged at the upper part of the alkali liquor buffer tank and is connected with the alkali liquor tank through a pipeline; the outlet of the buffer tank of the alkali liquor buffer tank is higher than the inlet of the alkaline washing tower.
The utility model discloses the caustic wash tower is the two-stage setting, including first caustic wash tower and second caustic wash tower, first caustic wash tower and second caustic wash tower between be series connection, tail gas gets into the bottom that the second caustic wash tower was washed through the top of first caustic wash tower.
The bottom parts of the first alkali washing tower and the second alkali washing tower are connected with alkali solution tanks, and alkali solution in the first alkali washing tower and the second alkali washing tower enters the alkali solution tanks through bottom outlets.
And an outlet of the buffer tank of the alkali liquor buffer tank is respectively connected with an upper inlet of the first alkali washing tower and an upper inlet of the second alkali washing tower, and the alkali liquor in the alkali liquor buffer tank automatically flows into the alkali washing tower through the upper inlets of the first alkali washing tower and the second alkali washing tower.
The pipe diameter (DN25) of the alkali liquor buffer tank connected with the first alkali washing tower and the second alkali washing tower is smaller than the pipe diameter (DN50) of the alkali liquor tank connected with the alkali liquor buffer tank for replenishing the alkali liquor.
The method for absorbing tail gas in air-blown bromine production by the device is provided with a two-stage alkaline washing absorption tower, and absorbs liquid caustic soda from a high-level buffer tank (3 m)3) The liquid level difference is utilized to automatically flow to the absorption tower for spraying, and the absorbed liquid caustic soda enters the lye circulating tank and is pumped to the top buffer tank to realize circulating absorption. The liquid caustic soda circulating pipeline has a pipe diameter of DN50, and the spraying liquid caustic soda pipeline hasDN25 pipe diameter, so the circulating liquid caustic soda amount in the buffer tank is larger than the self-flow, can ensure the liquid caustic soda in the buffer tank is sufficient, and when the liquid caustic soda in the tank is fully stored, the liquid caustic soda is overflowed to the circulating tank through the bypass overflow port.
According to the technical scheme, the spraying liquid caustic soda in the absorption tower flows automatically by utilizing liquid level difference and is absorbed in two stages in series.
The utility model has the advantages and beneficial effects that:
(1) the utility model discloses can guarantee that buffer tank liquid caustic soda is sufficient, after the emergency power failure, because high-order buffer tank liquid caustic soda is for flowing to the absorption tower automatically, replaces original pump to the mode of absorption tower, can keep normal operating, leads to stopping the pump because of having a power failure before having solved the transformation, and a large amount of acid gas of no absorption liquid spraying are arranged to atmospheric problem, have good social environmental protection benefit.
(2) The utility model discloses required equipment investment is less, and is low to original system transformation degree, and the tail gas fully absorbs can be realized to the two-stage series connection.
Drawings
FIG. 1 is a schematic view of the tail gas absorption device in air-blown bromine production of the present invention;
in the figure: 1. a tail gas recovery tower; 2. a first caustic wash tower; 3. a second caustic wash column; 4. an alkali liquor buffer tank; 5. An alkali liquor tank; 6. a circulation pump; 7. an overflow port; 8. an inlet of the buffer tank; 9. and (4) an outlet of the buffer tank.
Detailed Description
For further understanding of the contents, features and functions of the present invention, the following embodiments are enumerated in conjunction with the drawings, and the following detailed description is given:
referring to the attached drawing 1, the device of the utility model comprises a tail gas absorption tower 1, an alkaline washing tower, an alkaline solution tank 5 and a connecting pipeline, wherein the tail gas absorption tower 1 and the alkaline washing tower are connected in series, tail gas is discharged from the top of the tail gas absorption tower 1 and enters the alkaline washing tower from the bottom, a discharge port at the bottom of the alkaline washing tower is connected with the alkaline solution tank 5, the device comprises an alkaline solution buffer tank 4 which is connected with the alkaline washing tower and the alkaline solution tank 5 through a pipeline, the alkaline solution buffer tank is provided with a buffer tank inlet 8 and a buffer tank outlet 9, the buffer tank inlet 8 is arranged at the top of the alkaline solution buffer tank 4 and is connected to the bottom of the alkaline solution tank 5 through a pipeline, and a circulating pump 6 is arranged on the pipeline between the; the outlet 9 of the buffer tank is arranged at the bottom of the alkali liquor buffer tank 4 and is connected to the top of the alkaline tower through a pipeline; the alkali liquor buffer tank 4 is also provided with an overflow port 7 which is arranged at the upper part of the alkali liquor buffer tank 4 and is connected with the alkali liquor tank 5 through a pipeline; the position of the buffer tank outlet 9 of the alkali liquor buffer tank 4 is higher than the position of the alkali wash tower inlet.
The utility model discloses the caustic wash tower is the two-stage setting, including first caustic wash tower 2 and second caustic wash tower 3, first caustic wash tower 2 and second caustic wash tower 3 between be series connection, tail gas gets into the bottom that second caustic wash tower 3 through the top of first caustic wash tower 2. The bottoms of the first alkaline washing tower 2 and the second alkaline washing tower 3 are connected with an alkaline solution tank 5, and alkaline solution in the first alkaline washing tower 2 and the second alkaline washing tower 3 enters the alkaline solution tank 5 through a bottom outlet. And an outlet 9 of the buffer tank of the alkali liquor buffer tank 4 is respectively connected with the upper inlets of the first alkali washing tower 2 and the second alkali washing tower 3, and the alkali liquor in the alkali liquor buffer tank 4 automatically flows into the alkali washing towers through the upper inlets of the first alkali washing tower 2 and the second alkali washing tower 3.
The utility model uses HBr-containing mother liquor as absorption liquid after the distillation tail gas passes through a primary pickling absorption tower, and the mother liquor after primary absorption returns to the distillation tower for secondary distillation; the tail gas is further absorbed by a first alkali washing tower 2 and a second alkali washing tower 3 of two-stage series alkali washing absorption towers after being acid-washed and absorbed, alkali liquor is conveyed to a high alkali liquor level buffer tank 4 from an alkali liquor tank 5 through a circulating pump 6, then automatically flows to the two-stage alkali washing towers from the alkali liquor buffer tank 4 through a DN25 pipeline, and flows back to the alkali liquor tank 5 for circular absorption after being sprayed and absorbed in the towers. Because the pipe diameter (DN25) that first caustic wash tower 2 and second caustic wash tower 3 are connected to alkali lye buffer tank 4 is less than alkali lye jar 5 and connects alkali lye buffer tank 4 and supply liquid caustic pipe diameter (DN50), the surplus liquid caustic that gets into in the alkali lye buffer tank 4 overflows from bypass buffer tank export 9 on the upper portion of alkali lye buffer tank 4 and returns alkali lye jar 5, make the liquid caustic in alkali lye buffer tank 4 keep certain liquid level all the time, when the urgent power failure stop pump, the liquid caustic of high-order alkali lye buffer tank 4 can normally flow to two-stage caustic wash tower by oneself, keep continuing the operation absorption to tail gas, avoid acid gas evacuation atmosphere, cause environmental pollution, will empty bromine and retrieve simultaneously.
Through using the tracking, the utility model discloses tail gas absorption effect is better, in the 10-15 minutes of the evacuation of distillation column evacuation after the proruption power failure, finds not that the evacuation pipeline gets rid of acid gas, and the alkali lye intermediate tank remains alkali lye sufficient throughout, and the absorption tower normal operating of alkaline washing realizes bromine recovery simultaneously. The utility model discloses a gravity principle of flowing automatically realizes after apparatus for producing emergency shutdown, still can guarantee that alkali lye flows automatically and gets into the caustic wash tower in, realizes the neutralization absorption to tail gas, has realized good social environmental protection benefit to the loss of bromine product has been reduced.
The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (5)
1. The utility model provides a tail gas absorbing device in air blowing bromine production which characterized in that: the tail gas absorption tower and the alkaline washing tower are connected in series, tail gas is discharged from the top of the tail gas absorption tower and enters the alkaline washing tower from the bottom, a discharge outlet at the bottom of the alkaline washing tower is connected with the alkaline solution tank, the tail gas absorption tower and the alkaline washing tower are connected in series, the tail gas absorption tower comprises an alkaline solution buffer tank, the alkaline solution buffer tank is connected with the alkaline washing tower and the alkaline solution tank through a pipeline, the alkaline solution buffer tank is provided with a buffer tank inlet and a buffer tank outlet, the buffer tank inlet is arranged at the top of the alkaline solution buffer tank and is connected to the bottom of the alkaline solution tank through a pipeline, and a circulating pump is arranged on the pipeline between the buffer tank; the outlet of the buffer tank is arranged at the bottom of the alkali liquor buffer tank and is connected to the top of the alkaline washing tower through a pipeline; the alkali liquor buffer tank is also provided with an overflow port, is arranged at the upper part of the alkali liquor buffer tank and is connected with the alkali liquor tank through a pipeline; the outlet of the buffer tank of the alkali liquor buffer tank is higher than the inlet of the alkaline washing tower.
2. The tail gas absorption device in air-blowing bromine production according to claim 1, which is characterized in that: the alkaline washing tower is arranged in two stages and comprises a first alkaline washing tower and a second alkaline washing tower, the first alkaline washing tower and the second alkaline washing tower are connected in series, and tail gas enters the bottom of the second alkaline washing tower through the top of the first alkaline washing tower.
3. The tail gas absorption device in air-blowing bromine production according to claim 2, which is characterized in that: the bottom parts of the first alkali washing tower and the second alkali washing tower are connected with alkali solution tanks, and alkali solution in the first alkali washing tower and the second alkali washing tower enters the alkali solution tanks through bottom outlets.
4. The tail gas absorption device in air-blowing bromine production according to claim 1, which is characterized in that: and an outlet of the buffer tank of the alkali liquor buffer tank is respectively connected with an upper inlet of the first alkali washing tower and an upper inlet of the second alkali washing tower, and the alkali liquor in the alkali liquor buffer tank automatically flows into the alkali washing tower through the upper inlets of the first alkali washing tower and the second alkali washing tower.
5. The tail gas absorption device in air-blown bromine production according to claim 1 or 4, which is characterized in that: the pipe diameter of the alkali liquor buffer tank connected with the first alkali washing tower and the second alkali washing tower is smaller than the pipe diameter of the alkali liquor buffer tank connected with the alkali liquor buffer tank for replenishing liquid alkali.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922291056.8U CN212492318U (en) | 2019-12-18 | 2019-12-18 | Tail gas absorption device in air-blowing bromine production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922291056.8U CN212492318U (en) | 2019-12-18 | 2019-12-18 | Tail gas absorption device in air-blowing bromine production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212492318U true CN212492318U (en) | 2021-02-09 |
Family
ID=74386492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922291056.8U Active CN212492318U (en) | 2019-12-18 | 2019-12-18 | Tail gas absorption device in air-blowing bromine production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212492318U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111036054A (en) * | 2019-12-18 | 2020-04-21 | 天津长芦汉沽盐场有限责任公司 | Tail gas absorption device and method in air-blowing bromine production |
-
2019
- 2019-12-18 CN CN201922291056.8U patent/CN212492318U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111036054A (en) * | 2019-12-18 | 2020-04-21 | 天津长芦汉沽盐场有限责任公司 | Tail gas absorption device and method in air-blowing bromine production |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201862357U (en) | Device for absorbing tail gas | |
| CN102210964B (en) | Gas phase silicon dioxide tail gas treatment process and system | |
| CN109205573B (en) | Efficient separation and utilization process for tail gas of acyl chlorination reaction | |
| CN113398719A (en) | Device and method for recovering chlorine in tail chlorine | |
| CN212492318U (en) | Tail gas absorption device in air-blowing bromine production | |
| CN111036054A (en) | Tail gas absorption device and method in air-blowing bromine production | |
| CN108658818B (en) | Preparation method of cysteamine hydrochloride | |
| CN103550989B (en) | The integrated conduct method of tail gas in a kind of mercury chloride production process | |
| CN101659398A (en) | Method for recovering bromine tail gas and chlorine gas in bromine production | |
| CN202146695U (en) | Gas-phase silicon dioxide tail gas treatment system | |
| CN108144416B (en) | Bromine blowing tail gas overall process recovery method and equipment | |
| CN111249888B (en) | Tail gas treatment device and process for wet regeneration of waste sulfuric acid | |
| CN205109056U (en) | Sour vapor removal recovery unit of red fuming nitric acid (RFNA) production | |
| CN102381943B (en) | System and technology for producing coked crude phenol | |
| CN214513735U (en) | Chlorinated benzene production tail gas treatment system | |
| CN115784160A (en) | Energy-saving seawater bromine extraction process | |
| CN202265523U (en) | Production system for coking crude phenol | |
| CN109232171A (en) | A kind of method of the complete thick vinyl chloride gas middle acid substance of removing | |
| CN210186789U (en) | High-temperature hydrogen chloride waste gas treatment device with ionic membrane | |
| CN220900008U (en) | Device for producing bromine by alkaline absorption | |
| CN210645774U (en) | Chlorine absorption tower of recycling | |
| CN210543451U (en) | System tail gas recovery system glues | |
| CN214552306U (en) | Device for chlorination reaction by using thionyl chloride | |
| CN211813447U (en) | 75% sulfuric acid dechlorination system used in chlor-alkali production | |
| CN221208458U (en) | Titanium sponge still evaporates workshop tail gas treatment system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Gold Value (China) Financial Leasing Co.,Ltd. Assignor: Tianjin Changlu Hangu Saltern Co.,Ltd. Contract record no.: X2022980015530 Denomination of utility model: A kind of tail gas absorption device in air blowing bromine production Granted publication date: 20210209 License type: Exclusive License Record date: 20220916 |
|
| EE01 | Entry into force of recordation of patent licensing contract |