7789-41-5 Usage
Uses
Different sources of media describe the Uses of 7789-41-5 differently. You can refer to the following data:
1. Calcium bromide (CaBr2) is used as a developer for photographic film and paper and as a
dehydrating agent (drying agent), food preservative, and fire retardant.
2. In photography for making dry plates and light-sensitive papers; manufacture of mineral waters, NH4Br, fire-extinguishing compositions.
3. Made by the action of hydrobromic acid on calcium oxide
and crystallization. The white granular crystals are soluble in
water. Calcium bromide was used in making collodion emulsions,
particularly for dye-sensitized plates.
4. Calcium bromide has a number of useful applications.
Used in the oil and gas fields, the compound is a
true working example. At almost every stage of the oil
and gas extraction process, calcium bromide has found
extensive usage. Stability, dependability and ease of
use distinguish calcium bromide in the drilling process.
There, it is used in “drilling muds” worldwide.
Description
Calcium bromide has the chemical formula CaBr2. It
was first prepared by Pfeiffer, Klossmann and Angern
in 1924. It is a deliquescent salt that has the form of
colorless hexagonal crystals that are soluble in water and absolute alcohol. Its molecular weight is 199.90 g/
mol for the anhydride. When strongly heated in air,
calcium bromide will produce CaO (lime) and Br2. It
is generally obtained as the dihydrate, CaBr2·2H2O,
in the form of a white crystalline powder. A hexahydrate,
CaBr2·6H2O, is also known. Anhydrous calcium
bromide is obtained by dehydration (250°C, vacuum)
of the dihydrate CaBr2·2H2O. On contact with hot
surfaces or flames, CaBr2 decomposes forming
bromine as a toxic and corrosive fume. It also reacts
with strong acids to produce corrosive fumes of
bromine.
In its solid anhydrous state, it is a white powder.
CaBr2 can be found in drilling muds, neuroses medication,
freezing mixtures, food preservatives, photography
and fire retardants. The anhydride has a melting point
of 730°C and a boiling point of 810°C where it decomposes.
Its density is 3.41 g/cm3. It is moderately soluble
in water at 142 g/100 ml of water.
Chemical Properties
Calciumbromide, CaBr2, is a colorless crystalline solid with a melting point of 765°C. It is deliquescent and is soluble in water and absolute alcohol. Calcium bromide is used in medicine. Calcium bromide(hydrated), CaBr2·3H20, has a meiting point of 80.5℃.
Preparation
CaBr2·2H2O has a melting point of 38°C where it
dissolves in its own waters of hydration. Its density is
2.290 g/cm3. It can be prepared by reaction in solution
with HBr on the carbonate:
CaCO3 (solid)＋HBr (liq)→CaBr2 (liq)＋ CO2 (gas)
An improved method for producing calcium bromide
has been developed by reacting hydrogen bromide with
calcium hydroxide in the presence of water.
Check Digit Verification of cas no
The CAS Registry Mumber 7789-41-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,8 and 9 respectively; the second part has 2 digits, 4 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 7789-41:
(6*7)+(5*7)+(4*8)+(3*9)+(2*4)+(1*1)=145
145 % 10 = 5
So 7789-41-5 is a valid CAS Registry Number.
InChI:InChI=1/2BrH.Ca/h2*1H;/q;;+2/p-2
7789-41-5Relevant articles and documents
Phase diagram study of CaBr2-CaHBr system
Vishnu Vardhan, Chilakapati Venkata,Ghosh, Sajal,Nagaraj, Subramaniam,Sridharan, Raghavachary,Gnanasekaran, Thiagarajan
, p. 127 - 131 (2013)
A study of binary, CaBr2-CaHBr system was carried out by differential thermal analysis (DTA), covering the composition range from 100 % CaBr2 to 100 % CaHBr between room temperature and 800 C. From DTA results, the contour of solidus
Wilks, W. A. R.
, p. 12 (1912)
Differential thermal analysis under quasi-isothermal, quasi-isobaric conditions (Q-DTA) Part II. Water evaporation and the decomposition mechanism of compounds with structural and crystal water
Paulik,Bessenyey-Paulik,Walther-Paulik
, p. 75 - 82 (2004)
It is already a generally accepted opinion today that the course of DTA, DSC and TG curves is deteriorated by the non-isothermal heating control and by other experimental conditions to such an extent that it is more characteristic for the experimental conditions, than for the transformation itself. This problem can be eliminated completely by the simultaneous use of transformation-governed heating control (TGHC) and self-generated atmosphere (SGA) ensuring quasi-isothermal, quasi-isobaric conditions for the DTA measuring technique (Q-DTA). This experience is proven on the examples of the evaporation of water under boiling, the dehydration of Ca(OH)2, CuSO4·5H2O, CaBr2·6H2O, Mg(OH)2 and CaSO 4·2H2O by providing both, the results obtained by the DTA, TG and the Q-DTA measuring techniques.
Kendall, J.,Crittenden, E. D.,Miller, H. K.
, p. 963 - 998 (1923)
Studies on the phase diagram of CaCl2-CaBr2 system
Ghosh, Sajal,Sridharan,Gnanasekaran
, p. 69 - 72 (2010)
A study on pseudo-binary CaCl2-CaBr2 system was carried out using differential thermal analysis (DTA) technique covering the complete composition range of the constituents between room temperature and 1073 K. From the DTA results the contour of solidus and liquidus temperatures with composition are plotted and the phase diagram of CaCl2-CaBr 2 system is constructed. The solidus and liquidus curves exhibit a minimum at 971K and at a composition of 56.5 mol% CaBr2. Below 971 K, the system exhibits complete solid solution. Long-term equilibration of samples of several compositions was carried out at 923 and 673K and the phases were characterized by XRD. The XRD results supported solid solution formation in the CaCl 2-CaBr2 system between 673 and 923 K.
