The powdered calcium stearate comes in a white color. It is insoluble with water, cold alcohol and ether. But it is soluble with organic solvents, such as hot benzene. It is combustible, and it decomposes very slowly at 400degC. If a strong acid is used, it will decompose into stearic acids and the calcium salt.
Calcium stearate can be produced in four different ways
1. The synthesis is calcium stearate. The calcium chloride with a concentration of 1074kg/m3 (also known as 10degBe), is added to the sodium-stearate solution, and the metathesis reactions are carried out at approximately 65degC. Precipitation separates the calcium stearate. The final product is obtained after it has been filtered, cleaned with water and dried around 90degC.
2. In 300mL hot water, add 5.60g of calcium oxide (0.1mol). Pour 51.3g of chemically-pure stearic acids in 350mL at 70°C hot water, and add 0.75g to diethanolamine. Stir it up to emulsify. The prepared stearic-acid emulsion is added to the suspension of calcium oxide within 2h and thoroughly stirred. After that, the white, insoluble calcium stearate formed was filtered and dried.
3. The catalyst H2O2 is added slowly under constant stirring to the reaction pot. The reaction lasts 1.52.0h. The reaction is complete when the material has been discharged, cooled, and crushed.
4. Metathesis method – dissolve stearic acids in hot water 20 times their mass, add caustic soda saturated solution, and perform saponification reactions at around 75degC. You will get dilute sodium stearate. Then, the sodium stearate and calcium chloride solutions were mixed together. Metathesis was then carried out around 65 degrees Celsius, resulting in the precipitation of calcium stearate. The final product is obtained after it has been filtered, washed in water and dried around 90degC.
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