CN115403058A - Method for producing sodium bromide by two-stage continuous bromine extraction - Google Patents
Method for producing sodium bromide by two-stage continuous bromine extraction Download PDFInfo
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- CN115403058A CN115403058A CN202110583547.9A CN202110583547A CN115403058A CN 115403058 A CN115403058 A CN 115403058A CN 202110583547 A CN202110583547 A CN 202110583547A CN 115403058 A CN115403058 A CN 115403058A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/10—Bromides
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- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/09—Bromine; Hydrogen bromide
- C01B7/096—Bromine
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Abstract
A method for producing sodium bromide by two-stage continuous bromine extraction comprises the following steps: acidifying and oxidizing bromine-containing brine, and blowing out the brine in a counter-current manner to obtain a mixed gas I and blown-out brine I; washing the mixed gas I to obtain bromine-containing air I; oxidizing the blown brine I, and blowing out the brine in a counter-current manner to obtain a mixed gas II and blown brine II; washing the mixed gas II to obtain bromine-containing air II; preparing caustic soda, urea and water into absorption liquid, contacting with the bromine-containing air II, and performing countercurrent absorption to obtain primary absorption liquid; contacting the primary absorption liquid with the bromine-containing air I, and performing countercurrent absorption to obtain secondary absorption liquid; and evaporating the secondary absorption liquid, and carrying out solid-liquid separation to obtain a crystallization mother liquid and sodium bromide crystals. The invention has high extraction rate of bromine element, high purity of the obtained product and low production cost, and the whole process can be carried out at normal temperature.
Description
Technical Field
The invention relates to a method for producing sodium bromide by extracting bromine, in particular to a method for producing sodium bromide by two-stage bromine extraction.
Background
Bromine is an important chemical raw material and is widely applied to various fields such as flame retardants, medicines, pesticides, photographic materials, oil fields and the like. Bromine is extracted mainly from sea water, underground brine and salt lake water. The production method of bromine comprises the following steps: steam distillation, air blowing, continuous two-process vacuum bromine extraction, resin, liquid membrane, semi-permeable membrane, solvent extraction, etc. Among them, the steam distillation method and the air blowing method are most commonly used. The steam distillation method accounts for about 10% of the national bromine production capacity, and the air blowing method accounts for about 90% of the national bromine production capacity. The brine air blowing method for extracting bromine generally needs to be operated by multiple procedures of oxidation, blowing, absorption reduction, rectification, condensation and the like, and has long process flow and high energy consumption.
Sodium bromide is widely used as a multipurpose intermediate product in chemical products such as the photosensitive industry, pharmacy, synthetic perfume, printing and dyeing, organic synthesis and the like, and other industries. The bromine and compound field has wide application prospect.
CN 106185995A discloses a sodium bromide preparation method, comprising the steps of acidification oxidation, air blowing, three times absorption, concentration separation and drying of the finished product. The publication states that the process does not require washing and that the extraction yield can reach above 97%. However, the inventor of the invention finds that the extraction rate of the method is only about 90%, and the purity of the obtained product is only about 80%; because the solid solution of magnesium salt, sodium chloride and sodium bromide is contained in the product without washing, the solid solution is difficult to separate, the product quality is seriously influenced, and the consumption of urea is increased.
CN 101659426A discloses a method for preparing sodium bromide by continuous multi-stage air blowing: the bromine-containing brine is subjected to acidification and oxidation, heating and air blowing, washing, absorption and concentration to prepare the sodium bromide. The air blowing temperature and the cleaning solution temperature required for realizing the method are both high, the method cannot be completely realized at normal temperature, and the method has high requirements on equipment; moreover, the inventor of the invention finds that the extraction rate of the method is less than 90% through experiments, and has further improved space.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provide the method for producing the sodium bromide by two-stage continuous bromine extraction at normal temperature, wherein the method has high bromine extraction rate, high purity of the obtained product and low production cost.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for producing sodium bromide by two-stage continuous bromine extraction comprises the following steps:
(1) Acidifying the bromine-containing brine, and introducing chlorine gas for oxidation to obtain Br 2 Solution I;
(2) To said Br-containing 2 The solution I is blown out in a countercurrent mode by using air to obtain mixed gas I and blown brine I;
(3) Washing the mixed gas I to obtain bromine-containing air I; the washing is divided into two stages, wherein the first stage of washing adopts unoxidized bromine-containing brine and fresh water to prepare washing liquid, and the second stage of washing adopts washing liquid containing bromide ions;
(4) Introducing chlorine into the blown brine I for oxidation to obtain Br 2 Solution II;
(5) To said Br-containing 2 The solution II is blown out in a counter-current manner by using air to obtain a mixed gas II and blown brine II;
(6) Washing the mixed gas II to obtain bromine-containing air II; the washing is divided into two stages, wherein the first stage of washing adopts unoxidized bromine-containing brine and fresh water to prepare washing liquid, and the second stage of washing adopts washing liquid containing bromide ions;
(7) Preparing caustic soda, urea and water into absorption liquid, contacting with the bromine-containing air II, and performing countercurrent absorption to obtain primary absorption liquid;
(8) Contacting the primary absorption liquid with the bromine-containing air I, and performing countercurrent absorption to obtain secondary absorption liquid;
(9) And evaporating the secondary absorption liquid, and carrying out solid-liquid separation to obtain a crystallization mother liquid and sodium bromide crystals.
Preferably, in step (1), the acid used for acidification is sulfuric acid or hydrochloric acid; acidifying until the pH value of the bromine-containing brine is 2.5 to 4, and preferably 2.5 to 3.
Preferably, in the step (2), the volume ratio of the air to the bromine-containing solution is 150 to 50: 1.
Preferably, in step (3), the washing liquid used in the first stage of washing is prepared by mixing unoxidized brine and fresh water according to the ratio of 1: 1-5.
Preferably, in the step (3), the content of bromide ions in the washing liquid used in the second stage of washing is 30-80 g/l.
Preferably, in step (3), the washing solution used in the second washing stage is a sodium bromide solution.
Preferably, in step (3), the Cl in the washing liquid of the second washing stage - After the concentration is increased by 35 to 45g/L, the washing liquid returns to the step (2) and is used as Br-containing 2 Solution I was used.
Preferably, in the step (5), the volume ratio of the air to the bromine-containing solution is 150 to 100: 1, and more preferably 120 to 100: 1.
Preferably, in the step (6), the washing liquid used in the first stage of washing is prepared by mixing unoxidized brine and fresh water according to the ratio of 1: 1-5.
Preferably, in the step (6), the content of bromide ions in the washing liquid used in the second stage of washing is 30-80 g/l.
Preferably, in step (6), the washing liquid used in the second washing stage is sodium bromide solution.
Preferably, in step (6), the washing solution of the second washing stage contains Cl - After the concentration is increased by 35 to 45g/L, the washing liquid returns to the step (2) and is used as Br-containing 2 Solution I was used.
Mixed gas I and mixed gas II containing Br 2 、Cl 2 Salt fog; the mixed gas I and the mixed gas II are washed in two stages, wherein the first stage is used for removing foam entrainment such as magnesium salt fog and the like in the blown gas so as to avoid the influence on production operation and product quality caused by the generation of sediment substances such as magnesium hydroxide and the like in the subsequent absorption process; the second-stage washing liquid adopts a bromine ion-containing solution to remove excessive chlorine in the oxidation process, so that substances such as sodium chloride and the like generated in the subsequent absorption process are avoided, the consumption of a reducing agent urea is reduced, and the product quality is improved.
Preferably, in the step (7), the caustic soda, the urea and the water in the absorption liquid are configured according to the mass ratio of 3-5: 1: 25-30.
Preferably, the secondary absorption liquid obtained in step (8) is mixed with fresh water to prepare a washing liquid for the second-stage washing, and the washing liquid is returned to be used in step (3) or step (6).
Preferably, in the step (9), the crystallization mother liquor is returned to the step (8) as an absorption liquid.
The invention has the beneficial effects that: the invention has high extraction rate of bromine element, high purity of the obtained product and low production cost, and the whole process can be carried out at normal temperature.
Detailed Description
The present invention is further illustrated by the following examples.
The starting materials used in the examples of the present invention were all obtained from conventional commercial sources.
Example 1
The method for producing sodium bromide by two-stage continuous bromine extraction comprises the following steps:
(1) Adding hydrochloric acid into bromine-containing brine in a first-stage mixer at normal temperature for acidification, adjusting pH to 2.5, blowing chlorine gas under acidic condition to oxidize bromide ions into bromine simple substance to obtain Br-containing solution 2 Solution I;
(2) Will contain Br 2 The solution I enters a primary blow-out tower from the top of the primary blow-out tower through a spraying device, air is blown into the bottom of the primary blow-out tower, the volume ratio of the air amount to the bromine-containing solution is 100 times, the air and the bromine-containing solution are in countercurrent contact, and gaseous free bromine is resolved into the air to obtain a mixed gas I and blown-out brine I;
(3) The mixed gas I enters two washing towers to be continuously washed twice so as to remove foam entrainment and redundant chlorine and obtain bromine-containing air I; the first washing tower is prepared by mixing unoxidized bromine-containing brine and fresh water at a ratio of 1: 2, and the second washing tower is prepared by adding Br - The sodium bromide solution with the concentration of 50g/L is used as a washing solution, and the normal-temperature operation is carried out. When the second scrubber tower in the washing solution of (1), cl - After the concentration is increased by 40g/L, the washing liquid is returned to the step (2) as containing Br 2 Using the solution I;
(4) Introducing chlorine into the blown brine I for oxidation to obtain Br-containing brine 2 Solution II;
(5) Will contain Br 2 The solution II enters a secondary blow-off tower from the top of the secondary blow-off tower through a spraying device, air is blown into the bottom of the secondary blow-off tower, the volume ratio of the air amount to the bromine-containing solution is 100 times, the air is in countercurrent contact with the bromine-containing solution, and the gaseous free bromine is resolved into the air to obtain a mixed gas II and blown-off brine II; collecting the blown brine II and then carrying out post-treatment;
(6) The mixed gas II enters two washing towers to be continuously washed twice so as to remove foam entrainment and redundant chlorine and obtain bromine-containing air II; the first washing tower adopts unoxidized bromine-containing brine and fresh water in a ratio of 1: 3, and the second washing tower adopts Br - Sodium bromide solution with the concentration of 50g/L is used as washing liquid, and the operation is carried out at normal temperature. When the second scrubber tower in the washing solution of (1), cl - After the concentration is increased by 40g/L, the washing liquid is returned to the step (2) as containing Br 2 Using the solution I;
(7) And (2) allowing the bromine-containing air II to pass through an absorption tower, performing countercurrent absorption by using absorption liquid prepared from caustic soda, urea and water according to the mass ratio of 4: 1: 25, and completing the absorption of sodium hydroxide on bromine and the reduction of urea on sodium bromate in the absorption liquid in the tower to obtain primary absorption liquid.
(8) The bromine-containing air I sequentially passes through two absorption towers, countercurrent absorption is carried out by using primary absorption liquid, and the absorption of sodium hydroxide on bromine and the reduction of urea on sodium bromate in the absorption liquid are completed in the towers to obtain secondary absorption liquid; the concentration of sodium bromide in the obtained secondary absorption liquid is more than or equal to 25 percent by weight;
(9) The secondary absorption liquid is subjected to triple effect evaporation and solid-liquid separation; and (5) returning crystallization mother liquor obtained by solid-liquid separation to the step (8) as absorption liquid, wherein the obtained solid is sodium bromide crystal, and drying to obtain a sodium bromide product.
In the brine of the embodiment, the extraction rate of bromine is 98%, wherein 16% is from step (7), and 82% is from step (8).
Example 2
The method for producing sodium bromide by two-stage continuous bromine extraction comprises the following steps:
(1) Adding hydrochloric acid into bromine-containing brine in a first-stage mixer at normal temperature for acidification, and adjusting pH value3, blowing chlorine gas under the acidic condition, oxidizing bromide ions into bromine simple substance to obtain Br-containing 2 Solution I;
(2) Will contain Br 2 The solution I enters a primary blowing tower from the top of the primary blowing tower through a spraying device, air is blown from the bottom of the primary blowing tower, the volume ratio of the air amount to the bromine-containing solution is 120 times, the air and the bromine-containing solution are in countercurrent contact, and gaseous free bromine is resolved into the air to obtain a mixed gas I and blown brine I;
(3) The mixed gas I enters two washing towers to be continuously washed twice so as to remove foam entrainment and redundant chlorine and obtain bromine-containing air I; the first washing tower is prepared by mixing unoxidized bromine-containing brine and fresh water at a ratio of 1: 3, and the second washing tower is prepared by adding Br - Sodium bromide solution with the concentration of 70g/L is used as washing liquid, and the operation is carried out at normal temperature. When the second scrubber tower in the washing solution of (1), cl - After the concentration is increased by 45g/L, the washing liquid is returned to the step (2) as containing Br 2 Using the solution I;
(4) Introducing chlorine into the blown brine I for oxidation to obtain Br 2 Solution II;
(5) Will contain Br 2 The solution II enters a secondary blow-off tower from the top of the secondary blow-off tower through a spraying device, air is blown into the bottom of the secondary blow-off tower, the volume ratio of the air amount to the bromine-containing solution is 150 times, the air and the bromine-containing solution are in countercurrent contact, and the gaseous free bromine is resolved into the air to obtain a mixed gas II and blown-off brine II; collecting the blown brine II and then carrying out post-treatment;
(6) The mixed gas II enters two washing towers to be continuously washed twice to remove foam entrainment and redundant chlorine gas, and bromine-containing air II is obtained; the first washing tower is prepared by mixing unoxidized bromine-containing brine and fresh water at a ratio of 1: 2, and the second washing tower is prepared by adding Br - Sodium bromide solution with the concentration of 70g/L is used as washing liquid, and the operation is carried out at normal temperature. When the second scrubber tower in the washing solution of (1), cl - After the concentration is increased by 45g/L, the washing liquid is returned to the step (2) as containing Br 2 Using the solution I;
(7) And (2) allowing the bromine-containing air II to pass through an absorption tower, performing countercurrent absorption by using absorption liquid prepared from caustic soda, urea and water according to the mass ratio of 3: 1: 20, and completing the absorption of sodium hydroxide on bromine and the reduction of urea on sodium bromate in the absorption liquid in the tower to obtain primary absorption liquid.
(8) The bromine-containing air I sequentially passes through two absorption towers, countercurrent absorption is carried out by using primary absorption liquid, and the absorption of sodium hydroxide on bromine and the reduction of urea on sodium bromate in the absorption liquid are completed in the towers to obtain secondary absorption liquid; the concentration of sodium bromide in the obtained secondary absorption liquid is more than or equal to 25 percent by weight;
(9) The secondary absorption liquid is subjected to triple effect evaporation and solid-liquid separation; and (4) returning crystallization mother liquor obtained by solid-liquid separation to the step (8) to be used as absorption liquid, wherein the obtained solid is sodium bromide crystals, and drying to obtain a sodium bromide product.
The extraction rate of bromine in the brine of this example was 98%, with 17% from step (7) and 81% from step (8).
Example 3
The method for producing sodium bromide by two-stage continuous bromine extraction comprises the following steps:
(1) Adding hydrochloric acid into bromine-containing brine in a primary mixer at normal temperature for acidification, adjusting pH to 3, blowing chlorine gas under acidic condition to oxidize bromide ions into bromine simple substance to obtain Br 2 Solution I;
(2) Will contain Br 2 The solution I enters a primary blowing tower from the top of the primary blowing tower through a spraying device, air is blown from the bottom of the primary blowing tower, the volume ratio of the air amount to the bromine-containing solution is 70 times, the air and the bromine-containing solution are in countercurrent contact, and gaseous free bromine is resolved into the air to obtain a mixed gas I and blown brine I;
(3) The mixed gas I enters two washing towers to be continuously washed twice to remove foam entrainment and redundant chlorine gas, and bromine-containing air I is obtained; the first washing tower is prepared by mixing unoxidized bromine-containing brine and fresh water at a ratio of 1: 5, and the second washing tower is prepared by adding Br - Sodium bromide solution with the concentration of 40g/L is used as washing liquid, and the operation is carried out at normal temperature. When the second scrubber tower in the washing solution of (1), cl - After the concentration is increased by 35g/L, the washing liquid is returned to the step (2) as containing Br 2 Using the solution I;
(4) Introducing chlorine into the blown brine I for oxidation to obtain Br-containing brine 2 Solution II;
(5) Will contain Br 2 The solution II enters a secondary blow-off tower from the top of the secondary blow-off tower through a spraying device, air is blown into the bottom of the secondary blow-off tower, the volume ratio of the air amount to the bromine-containing solution is 120 times, the air and the bromine-containing solution are in countercurrent contact, and the gaseous free bromine is resolved into the air to obtain a mixed gas II and blown-off brine II; collecting the blown brine II and then carrying out post-treatment;
(6) The mixed gas II enters two washing towers to be continuously washed twice to remove foam entrainment and redundant chlorine gas, and bromine-containing air II is obtained; the first washing tower is prepared by mixing unoxidized bromine-containing brine and fresh water at a ratio of 1: 4, and the second washing tower is prepared by adding Br - The sodium bromide solution with the concentration of 40g/L is used as a washing solution, and the normal-temperature operation is carried out. When the second scrubber tower in the washing solution of (1), cl - After the concentration is increased by 35g/L, the washing liquid is returned to the step (2) as containing Br 2 Using the solution I;
(7) And (2) allowing the bromine-containing air II to pass through an absorption tower, performing countercurrent absorption by using absorption liquid prepared from caustic soda, urea and water according to the mass ratio of 5: 1: 30, and completing the absorption of sodium hydroxide on bromine and the reduction of urea on sodium bromate in the absorption liquid in the tower to obtain primary absorption liquid.
(8) The bromine-containing air I sequentially passes through two absorption towers, countercurrent absorption is carried out by using primary absorption liquid, and the absorption of sodium hydroxide on bromine and the reduction of urea on sodium bromate in the absorption liquid are completed in the towers to obtain secondary absorption liquid; the concentration of sodium bromide in the resulting secondary absorption liquid is ≥ 25% wt%;
(9) The secondary absorption liquid is subjected to triple effect evaporation and solid-liquid separation; and (5) returning crystallization mother liquor obtained by solid-liquid separation to the step (8) as absorption liquid, wherein the obtained solid is sodium bromide crystal, and drying to obtain a sodium bromide product.
The extraction rate of bromine in the brine of this example was 97%, wherein 16% was from step (7) and 81% was from step (8).
Claims (10)
1. A method for producing sodium bromide by two-stage continuous bromine extraction is characterized by comprising the following steps:
(1) Acidifying the bromine-containing brine, introducing chlorine gas for oxidation to obtain Br 2 Solution I;
(2) To said Br-containing 2 The solution I is blown out in a counter-current mode by using air to obtain a mixed gas I and blown brine I;
(3) Washing the mixed gas I to obtain bromine-containing air I; the washing is divided into two stages, wherein the first stage of washing adopts unoxidized bromine-containing brine and fresh water to prepare washing liquid, and the second stage of washing adopts washing liquid containing bromide ions;
(4) Introducing chlorine into the blown brine I for oxidation to obtain Br-containing brine 2 Solution II;
(5) To the Br-containing 2 The solution II is blown out in a counter-current manner by using air to obtain a mixed gas II and blown brine II;
(6) Washing the mixed gas II to obtain bromine-containing air II; the washing is divided into two stages, wherein the first stage of washing adopts unoxidized bromine-containing brine and fresh water to prepare washing liquid, and the second stage of washing adopts washing liquid containing bromide ions;
(7) Preparing caustic soda, urea and water into absorption liquid, contacting with the bromine-containing air II, and performing countercurrent absorption to obtain primary absorption liquid;
(8) Contacting the primary absorption liquid with the bromine-containing air I, and performing countercurrent absorption to obtain secondary absorption liquid;
(9) And evaporating the secondary absorption liquid, and carrying out solid-liquid separation to obtain a crystallization mother liquid and sodium bromide crystals.
2. The method for producing sodium bromide by two-stage continuous bromine extraction is characterized in that in the step (1), the acid used for acidification is sulfuric acid or hydrochloric acid; acidifying until the pH value of the bromine-containing brine is 2.5 to 4.
3. The method for producing sodium bromide by two-stage continuous bromine extraction as claimed in claim 1 or 2, wherein in the step (2), the volume ratio of the air to the bromine-containing solution is 150 to 50: 1.
4. The method for producing sodium bromide by two-stage continuous bromine extraction according to any one of claims 1 to 3, wherein in the step (3), the washing solution used in the first stage of washing is prepared by unoxidized brine and fresh water according to the ratio of 1: 1-5; the content of bromide ions in the washing liquid used in the second-stage washing is 30-80 g/l; cl in the washing liquid of the second washing stage - After the concentration is increased by 35 to 45g/L, the washing liquid returns to the step (2) and is used as Br-containing 2 Solution I was used.
5. The method for producing sodium bromide by two-stage continuous bromine extraction according to any one of claims 1 to 4, wherein in the step (5), the volume ratio of the air to the bromine-containing solution is 150 to 100: 1.
6. The method for producing sodium bromide by two-stage continuous bromine extraction according to any one of claims 1 to 5, wherein in the step (6), the washing solution used in the first stage of washing is prepared by unoxidized brine and fresh water according to the ratio of 1: 1-5; the content of bromide ions in the washing liquid used for the second-stage washing is 30-80 g/l; cl in the washing liquid of the second washing stage - After the concentration is increased by 35 to 45g/L, the washing liquid returns to the step (2) and is used as Br-containing 2 Solution I was used.
7. The method for producing sodium bromide by two-stage continuous bromine extraction according to any one of claims 1 to 6, wherein in the step (3) or the step (6), the washing liquid used for the second stage washing is a sodium bromide solution.
8. The method for producing sodium bromide by two-stage continuous bromine extraction according to any one of claims 1 to 7, wherein in the step (7), the caustic soda, the urea and the water in the absorption liquid are prepared according to the mass ratio of 3-5: 1: 25-30.
9. The method for producing sodium bromide by two-stage continuous bromine extraction according to any one of claims 1 to 6 and 8, characterized in that the secondary absorption liquid obtained in step (8) and fresh water are prepared into a washing liquid for the second stage washing, and the washing liquid is returned to step (3) or step (6) for use.
10. The method for producing sodium bromide by two-stage continuous bromine extraction according to any one of claims 1 to 9, wherein in the step (9), the crystallization mother liquor is returned to the step (8) to be used as an absorption liquid.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB523607A (en) * | 1939-01-09 | 1940-07-18 | Dow Chemical Co | Improvements in or relating to the extraction of bromine |
| US20050132883A1 (en) * | 1999-07-19 | 2005-06-23 | Qingquan Su | Acid gas scrubbing apparatus and method |
| CN101659426A (en) * | 2009-09-02 | 2010-03-03 | 达州市恒成能源（集团）有限责任公司 | Method for preparing sodium bromide by continuous multi-stage air blow |
| CN106185995A (en) * | 2016-07-07 | 2016-12-07 | 山东海王化工股份有限公司 | Sodium bromide preparation method |
| US20170152160A1 (en) * | 2014-06-06 | 2017-06-01 | Weifang Northsea Oasis Solar Powered Technology Co., Ltd. | A process for producing salt by means of strong brine concentration after sea water desalination by using a two-way circulation method and bromine extraction |
| CN111285331A (en) * | 2018-12-07 | 2020-06-16 | 华东理工大学 | Method for preparing hydrobromic acid and sodium bromide from bromine-containing brine in short process |
-
2021
- 2021-05-27 CN CN202110583547.9A patent/CN115403058A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB523607A (en) * | 1939-01-09 | 1940-07-18 | Dow Chemical Co | Improvements in or relating to the extraction of bromine |
| US20050132883A1 (en) * | 1999-07-19 | 2005-06-23 | Qingquan Su | Acid gas scrubbing apparatus and method |
| CN101659426A (en) * | 2009-09-02 | 2010-03-03 | 达州市恒成能源（集团）有限责任公司 | Method for preparing sodium bromide by continuous multi-stage air blow |
| US20170152160A1 (en) * | 2014-06-06 | 2017-06-01 | Weifang Northsea Oasis Solar Powered Technology Co., Ltd. | A process for producing salt by means of strong brine concentration after sea water desalination by using a two-way circulation method and bromine extraction |
| CN106185995A (en) * | 2016-07-07 | 2016-12-07 | 山东海王化工股份有限公司 | Sodium bromide preparation method |
| CN111285331A (en) * | 2018-12-07 | 2020-06-16 | 华东理工大学 | Method for preparing hydrobromic acid and sodium bromide from bromine-containing brine in short process |
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