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<p style="text-align: justify;">Effect of hydroxyl alkyl amines on the solubility behavior of calcium sulphate dihydrate (gypsum) in the aqueous sodium chloride system at 35 °C</p>

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Title Statement <p style="text-align: justify;">Effect of hydroxyl alkyl amines on the solubility behavior of calcium sulphate dihydrate (gypsum) in the aqueous sodium chloride system at 35 °C</p>
 
Added Entry - Uncontrolled Name Shukla, Jignesh ; Salt and Marine Chemicals Division, CSIR-Central Salt and Marine Chemicals Research Institute, Council of Scientific and Industrial Research, GB Marg, Bhavnagar 364 002, India
Kumar, Arvind ; Salt and Marine Chemicals Division, CSIR-Central Salt and Marine Chemicals Research Institute, Council of Scientific and Industrial Research, GB Marg, Bhavnagar 364 002, India
CSIR-India
 
Uncontrolled Index Term Thermodynamics
Solution chemistry, Solubility, Density, Compressibility, Calcium sulphate, Gypsum, Hydroxyl alkyl amines
 
Summary, etc. The solubility behavior of calcium sulphate dihydrate (gypsum, CaSO<sub>4</sub>·2H<sub>2</sub>O) in aqueous NaCl solutions upon addition of hydroxyl alkyl amines, such as, ethanolamine (EA), diethanolamine (DEA), or triethanolamine (TEA) at 35 °C is reported.  The addition of hydroxyl alkyl amines alters the solubility of CaSO<sub>4</sub>·2H<sub>2</sub>O in NaCl solutions significantly. At any equal concentration of hydroxyl alkyl amines in the solution, the order of CaSO<sub>4</sub>·2H<sub>2</sub>O solubility enhancement is found to be: EA &lt; DEA &lt; TEA. A three-fold increase in CaSO<sub>4</sub>·2H<sub>2</sub>O solubility maximum is observed in the solutions containing 15 wt% TEA. The addition of hydroxyl alkyl amines shifts the solubility maximum of CaSO<sub>4</sub>·2H<sub>2</sub>O towards higher concentration of NaCl in solution. Solution properties such as density (<em>ρ</em>) and speed of sound (<em>u</em>) data have been measured for the quaternary systems (CaSO<sub>4</sub>·2H<sub>2</sub>O+NaCl+hydroxyl alkyl amines+H<sub>2</sub>O). All the measurements have been carried out at 35 °C under atmospheric pressure. Solution isentropic compressibility (<em>κ</em><sub>S</sub>) values have been derived from <em>u</em> and <em>ρ</em> data. Solubility, density, speed of sound, and isentropic compressibility data have been fitted with suitable polynomial equations in these systems.
 
Publication, Distribution, Etc. Indian Journal of Chemistry -Section A (IJCA)
2020-10-29 11:16:02
 
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http://op.niscair.res.in/index.php/IJCA/article/view/15962
 
Data Source Entry Indian Journal of Chemistry -Section A (IJCA); ##issue.vol## 56, ##issue.no## 4 (2017): INDIAN JOURNAL OF CHEMISTRY - SECTION A
 
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Nonspecific Relationship Entry http://op.niscair.res.in/index.php/IJCA/article/download/15962/47956
http://op.niscair.res.in/index.php/IJCA/article/download/15962/47957
 
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