ChemicalBook > Product Catalog > API > Nervous system drugs > Sedative and hypnotic > Potassium bromide
Potassium bromide Chemical Properties
- Melting point:734 °C (lit.)
- Boiling point:1435 °C/1 atm (lit.)
- Density 3.119 g/mL at 25 °C(lit.)
- vapor density 7.14 (vs air)
- vapor pressure 175 mm Hg ( 20 °C)
- refractive index 1.559
- Flash point:1435°C
- storage temp. Store at +5°C to +30°C.
- solubility H2O: 1 M at 20 °C, clear, colorless
- form random crystals
- color White
- Specific Gravity2.75
- PH5.0-8.8 (25℃, 50mg/mL in H2O)
- Water Solubility 650 g/L (20 ºC)
- Sensitive Hygroscopic
- λmaxλ: 260 nm Amax: 0.01
λ: 280 nm Amax: 0.01
- Merck 14,7618
- Stability:Stable. Incompatible with strong oxidizing agents, strong acids, bromine trifluoride and bromine trichloride.
- CAS DataBase Reference7758-02-3(CAS DataBase Reference)
- NIST Chemistry ReferencePotassium bromide(7758-02-3)
- EPA Substance Registry SystemPotassium bromide (7758-02-3)
Potassium bromide Usage And Synthesis
- DescriptionPotassium bromide can be used as analytical reagents and developers, but also for the pharmaceutical industry.
It can be used as the emulsion reagents for the filmstrip and photo film; used for formulating developer, used as a sedative in medical treatment.
In photographic materials, Potassium bromide is used in the manufacture of photographic film, developer, film thickener, toner and color photo bleach. In medication, it is used as nerve tranquilizers (tribromide). In addition, it is also used for chemical analysis reagents, the transmission of the spectra and infrared ray, for making special soap as well as being used in sculpture, lithography and so on.
It can be used for the preforming in the infrared test.
- Uses▼▲IndustryApplicationRole/benefitPhotographyPreparation of developing agentRestrainer/ improves differentiation between exposed and unexposed crystals of silver halide, and thus reduces fogPrint developing solutionAlkaline accelerator/increases the printing density of thin negativesOpticsInfrared spectroscopySample carrier/has no significant optical absorption lines in its high transmission regionHuman medicineTreatment of epileptic and seizure disordersEffective component/anti-convulsant and sedative activityVeterinaryTreatment of seizures in dogs, cats,etc.Effective component/anti-convulsant and sedative activityChemical analysisTitration determination of copper and silverTitration agentPolarographic analysis of indium, cadmium and arsenicAnalytical agentRemoval of peripheral membrane proteins
- Spectrum purityFor IR detection; used for infrared sample preparation;
0 ° C to 53.6 g; 10 ° C to 59.5 g; 20 ° C to 65.3 g; 30 ° C to 70.7 g; 40 ° C to 75.4 g
60 ° C to 85.5 g; 80 ° C to 94.9 g; 90 ° C to 99.2 g; 100 ° C to 104 g.
- PreparationThe bromide is first reacted with scrap iron to obtain the Fe3Br8 • 16H2O, followed by reaction with the boiling potassium carbonate solution. Fe3Br8 • 16H2O + K2CO3-boiling heat-> 8KBr + Fe3O4 + 4CO2 + 16H2O, the Fe3O4 is filtered, followed by concentration to obtain potassium bromide.
Urea reduction method: send the caustic potassium solution dissolved with urea caustic potassium solution sent to the reactor. Slowly add bromine at 80 ° C for reaction. The reaction is completed when the Ph value is 6-7. The reaction solution is added to the storage tank, subjecting to activated carbon decolorization. When the solution becomes clean, apply filtering, evaporation, crystallization, centrifugal separation and drying, that is the finished product of potassium bromide. Its reaction equation is:
3Br2 + 6KOH + CO (NH2) 2 → 6KBr + 5H2O + CO2 ↑ + N2 ↑
- ToxicityAvoid ingestion or inhalation; avoid eye and skin contact. Upon ingestion, head dizziness, nausea may occur. Immediately seek medical treatment; Upon inhalation, vomiting will happen, the patient should be immediately moved to place with fresh air and sent for medical treatment; if splashed into eyes, immediately rinse with a lot of fresh water for 2 0min; skin, upon being contact with potassium bromide, should also be subject to rinsing with plenty of water.
- Chemical PropertiesWhite, crystalline granules or pow- der; pungent, strong, bitter, saline taste; somewhat hygroscopic.Solu- ble in water and glycerol; slightly soluble in alcohol and ether.
- UsesThis white crystal was made by the action of bromine on hot potassium hydroxide solution. It is soluble in water but much less so in alcohol. Potassium bromide was used as a secondary halide in combination with an iodide in the paper negative processes, the albumen on glass process, and the wet collodion processes. When silver bromide gelatin emulsion was invented, potassium bromide was the primary halide. It was also used in combination with either bichloride of mercury, copper sulfate, or potassium ferricyanide in photographic bleaches and as a restrainer in alkaline developers used for gelatin plates and developing-out papers.
- Usesmanufacture of photographic papers and plates; process engraving.
- UsesPotassium bromide (KBr) is used in photography and as a medical sedative.
- DefinitionChEBI: A metal bromide salt with a K(+) counterion.
- Definitionpotassium bromide: A white orcolourless crystalline solid, KBr,slightly hygroscopic and soluble inwater and very slightly soluble inethanol; cubic; r.d. 2.75; m.p. 734°C;b.p. 1435°C. Potassium bromide maybe prepared by the action of bromineon hot potassium hydroxide solutionor by the action of iron(III) bromideor hydrogen bromide on potassiumcarbonate solution. It is used widelyin the photographic industry and isalso used as a sedative. Because of itsrange of transparency to infrared radiation,KBr is used both as a matrixfor solid samples and as a prism materialin infrared spectroscopy.
- General DescriptionOdorless colorless crystals or white crystalline powder or white granular solid with a pungent bitter saline taste. Aqueous solutions are neutral (pH about 7).
- Air & Water ReactionsWater soluble.
- Reactivity ProfilePotassium bromide is not in generally strongly reactive. A weak reducing agent, incompatible with oxidizing agents. Also incompatible with salts of mercury and silver. Violent reactions occur with bromine trifluoride. May react with nitrous ether spirit, many alkaloidal salts and starch. May also react with acids . Reacts with concentrated sulfuric acid to generate fumes of hydrogen bromide.
- HazardToxic by ingestion and inhalation
- Fire HazardFlash point data for Potassium bromide are not available; however, Potassium bromide is probably nonflammable.
- Safety ProfileModerately toxic by ingestion and intraperitoneal routes. Large doses can cause central nervous system depression. Prolonged inhalation may cause skin eruptions. Mutation data reported. Violent reaction with BrF3. When heated to decomposition it emits toxic fumes of K2O and Br-. See also BROMIDES.
- Veterinary Drugs and TreatmentsBromides are used both as primary therapy and as adjunctive therapy
to control seizures in dogs that are not adequately controlled by
phenobarbital (or primidone) alone (when steady state trough phenobarbital
levels are >30 mcg/mL for at least one month). While
historically bromides were only recommended for use alone in patients
suffering from phenobarbital (or primidone) hepatotoxicity,
they are more frequently used as a drug of first choice.
Although not frequently used, bromides are also considered suitable by some for use in cats with chronic seizure disorders, but cats may be more susceptible to the drug’s adverse effects.
- Purification MethodsCrystallise the bromide from distilled water (1mL/g) between 100o and 0o. Wash it with 95% EtOH, followed by Et2O. Dry it in air, then heat it at 115o for 1hour, pulverize it, then heat it in a vacuum oven at 130o for 4hours. It has also been crystallised from aqueous30% EtOH, or EtOH, and dried over P2O5 under vacuum before heating in an oven.
Potassium bromide Preparation Products And Raw materials
- Raw materialsPotassium carbonateBrominePotassium hydroxide UreaHydrogen bromide2,3-DICHLORO-5,8-DIHYDROXY-1,4-NAPHTHOQUINONE(2S,5R,6R)-6-[(R)-2-Amino-2-phenylacetamido]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
- Preparation ProductsCuprous bromidePotassium bromate (S)-4-BOC-MORPHOLINE-3-CARBOXYLIC ACID4-BROMOMETHYLTETRAHYDROPYRANMORPHOLINE-3,4-DICARBOXYLIC ACID 4-TERT-BUTYL ESTER3-Bromo-7-(trifluoromethyl)imidazo[1,2-a]pyrimidineCyclopropanecarboxaldehydeBeclobrateTazobactam acidDL-Threonine1 10-PHENANTHROLINE-5 6-DIONE 97HydroxyacetoneKETENE DIETHYL ACETAL5-Bromo-2-oxindole3-Bromobenzophenonetrans,trans-Muconic acid4-Bromobenzyl bromidemercurous bromide4-Phenoxy-2,6-Diisopropyl AnilineMERCURIC BROMIDE
- Lithium Bromide hydrate GERANYL BROMIDE Copper(I) bromide-dimethyl sulfide Cuprous bromide NICKEL(II) BROMIDE TRIHYDRATE Cupric bromide Sodium bromide INDIUM(III) BROMIDE Hydrogen bromide Ethidium bromide Zinc bromide Cyanogen bromide Ammonium bromide NICKEL BROMATE Benzyl bromide NEODYMIUM(III) BROMIDE HYDRATE TITANIUM(IV) BROMIDE Magnesium bromide
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