Sodium Bromide Photosensitive - Sodium Bromide – TOPTION

Company profile

Business Type : Manufacturer/Factory&Trading Company
Main Product : Magnesium Chloride Calcium Chloride,Barium Chloride,
Sodium Metabisulphite, Sodium Bicarbonate
Number of Employees : 150
Year of Estabulishment : 2006
Management System Certification: ISO 9001
Location : Shandong,China(Mainland)

Basic information

Physical and chemical property

Physical Properties
1) Properties: Colorless cubic crystal or white granular powder.It is odorless, salty and slightly bitter.
2) Density (g/mL, 25 ° C) : 3.203;
3) Melting point (℃) : 755;
4) Boiling point (° C, atmospheric pressure) : 1390;
5) Refractive index: 1.6412;
6) Flash point (° C) : 1390
7) Solubility: it is easily soluble in water (solubility is 90.5g/100ml water at 20 ° C, solubility is 121g/100ml water at 100 ° C), the aqueous solution is neutral and conductive.Slightly soluble in alcohol, soluble in acetonitrile, acetic acid.
8) Vapor pressure (806 ° C) : 1mmHg.
Chemical properties
1) Anhydrous sodium bromide crystals precipitate in the sodium bromide solution at 51℃, and dihydrate is formed when the temperature is lower than 51℃.
NaBr + 2 h2o = NaBr · 2 H2O
2) Sodium bromide can be replaced by chlorine gas to give bromine.
2Br-+Cl2=Br2+2Cl-
3) Sodium bromide reacts with concentrated sulfuric acid to generate bromine, that is, under the action of strong oxidizing acid, sodium bromide can be oxidized and free from bromine.
2NaBr+3H2SO4 (concentrated) =2NaHSO4+Br2+SO2↑+2H2O
4) Sodium bromide can react with dilute sulfuric acid to produce hydrogen bromide.
NaBr+H2SO4=HBr+NaHSO4
5) In aqueous solution, sodium bromide can react with silver ions to form light yellow solid silver bromide.
Br – + Ag + = AgBr left
6) Electrolysis of sodium bromide in molten state to generate bromine gas and sodium metal.
2 energized nabr = 2 na + Br2
7) Sodium bromide aqueous solution can generate sodium bromate and hydrogen by electrolysis.
NaBr + 3H2O= electrolytic NaBrO3 + 3H2↑
8) Organic reactions can occur, such as the main reaction to make bromoethane:
NaBr + – H2SO4 + CH2CH2OH ⇌ NaHSO4 + CH3CH2Br + H2O

Product details

Preparation Methods

1) Industrial method
The slightly excessive bromine is directly added to the saturated sodium hydroxide thermal solution to generate a mixture of bromide and bromate:
3Br2+6NaOH=5NaBr+NaBrO3+3H2O
The mixture is evaporated to dry, and the resulting solid residue is mixed with toner and heated to reduce the bromate to bromide:
NaBrO3 = NaBr + 3 c + 3 co write
Finally, it is dissolved in water, then filtered and crystallized, and dried at 110 to 130 degrees Celsius.
*This method is the general method of preparing bromide by bromine and is generally used in industry.
2)Neutralization method
Use sodium bicarbonate as raw material: dissolve sodium bicarbonate in water, and then neutralize it with 35%-40% hydrobromide to get sodium bromide solution, which is condensed and cooled to precipitate sodium bromide dihydrate.Filter, dissolve the dihydrate with a small amount of water, drop bromine water until the color of bromine just appears.Heat, decolor in an aqueous solution of hydrogen sulfide, and bring to a boil.At high temperature, anhydrous crystallization precipitates, and after drying, it is transferred to the dryer and kept at 110 for 1 hour.It is then cooled in a dryer with calcium bromide desiccant to obtain anhydrous sodium bromide (reagent grade).
Reaction principle: HBr+ NAHCO ₃→NaBr+CO2↑+H2O
With 40% liquid alkali as raw material: put hydrobromide acid into the reaction pot, under constant stirring, slowly add 40% liquid alkali solution, neutralize to pH7.5 — 8.0, react to produce sodium bromide solution.The sodium bromide solution was centrifuged and filtered into the dilute sodium bromide solution storage tank.Then into the evaporation tank concentration, intermediate feeding 1-2 times, to the specific gravity of 1. 55°Be or so, centrifugal filtration, filtration into concentrated sodium bromide liquid storage tank.Then pressed into the crystallization tank, in the stirring cooling crystallization, and then the crystallization of centrifugal separation, the finished product.The mother liquor is returned to the dilute sodium bromide liquid storage tank.
Reaction principle: HBr+NaOH→NaBr+H2O
3)Urea reduction method:
In the alkali tank, the soda is dissolved in hot water at a temperature of 50-60 °C, and then urea
is added to dissolve 21°Be solution.Then into the reduction reaction pot, slowly through bromine, control the reaction temperature of 75-85 °C, to the pH of 6-7, that is, to reach the end of the reaction, stop the bromine and stirring, get sodium bromide solution.
Adjust pH to 2 with hydrobromic acid, and then adjust pH to 6-7 with urea and sodium hydroxide to remove bromate.The solution is heated to a boil and a saturated solution of barium bromide is added at pH6 — 7 to remove the sulfate.If barium salt is excessive, dilute sulfuric acid can be added to remove.Add activated carbon to the reaction material after removing impurities, and place it for 4-6 hours. After the solution is clarified, it is filtered, evaporated at atmospheric pressure, and the intermediate material is filled several times. Stop feeding for 2 hours before crystallization.Adjust pH to 6-7 1 hour before crystallization.The sodium bromide was separated and dried in a rotary drum dryer.
Principle of reaction: 3Br2+3Na2CO3+ NH2ConH2 =6NaBr+4CO2↑+N2↑+2H2O

Applications

Flowchart of Sodium Sulfite

1)Used for trace analysis and determination of tellurium and niobium and preparation of developer solution, also used as reducing agent;
2)Used as man-made fiber stabilizer, fabric bleaching agent, photographic developer, dyeing and bleaching deoxidizer, flavor and dye reducing agent, paper lignin remover, etc.
3)Used as a common analytical reagent and photosensitive resistor material;
4)Reductive bleaching agent, which has a bleaching effect on food and a strong inhibition effect on oxidase in plant food.
5)Printing and dyeing industry as a deoxidizer and bleach, used in the cooking of various cotton fabrics, can prevent the local oxidation of cotton fiber and affect the fiber strength, and improve the whiteness of the cooking substance.The photographic industry uses it as a developer.
6) Used by the textile industry as a stabilizer for man-made fibres.
7)The electronics industry is used to make photosensitive resistors.
8)Water treatment industry for electroplating wastewater, drinking water treatment;
9)Used as bleach, preservative, loosening agent and antioxidant in food industry.It is also used in pharmaceutical synthesis and as a reducing agent in the production of dehydrated vegetables.
10)Used for producing cellulose sulfite ester, sodium thiosulfate, organic chemicals, bleached fabrics, etc., also used as reducing agent, preservative, dechlorination agent, etc.;
11) The laboratory is used to prepare sulfur dioxide

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