What is sodium oleate?


Jul 12, 2023

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Sodium oleate , alias sodium octadecenoate, cis-9-octadecenol, oleyl alcohol, cis-9-octadecenol, (Z)-octadecenol, olive oil, cis -9-octadecen-1-ol, 9-n-octadecenol, octadecenol. It’s an organic oil with the chemical formula C17H33CO2Na. It is the main constituent of olive oil soap and tallow soap. You can also make it by reacting sodium-hydroxide with the oleic acids. It is composed of two components, a base hydrophobic and one hydrophilic. It has a good solubility with hot water and excellent emulsification. It’s used as a fabric waterproofing agent and anionic surfactant. Basic Information on Sodium Oleate
English name: SODIUM OLEATE
Oleic Acid Salt (cis-Oleate)
CAS Number: 143-291
Weight in Molecular Mass: 304.44300
Accurate quality: 304.23800
PSA: 40.13000
LogP: 4.77380

The properties of sodium oleate
This can cause rancidity and oxidation in the air. It is due to the fact that oleic is oxidized. The double bond is broken, resulting in rancid substances such as nonanal. The corruption is accelerated by mixing in highly unsaturated chemicals.
Dissolved in 10 times more water will foam and produce a viscous solution. The aqueous solutions is alkaline. Liquid becomes milky because of partial hydrolysis to insoluble acidic soap and sodium hydroxide. It is not hydrolyzed in ethanol. In about 20 times more ethanol, it dissolves. It is nearly insoluble in petroleum ether and other organic solvants.
Hy-drolysis reaction: 2RCOONa+H2O=RCOONa*RCOOH+NaOH
Chemical Reaction
Reacts with other metal ions than alkali elements to produce metal salt precipitation.
Other properties
It is the nature of salt that it can’t be volatilized but can be completely dissociated in water into ions. Salt can be converted to hydroxy acid by adding mineral acids (strong acids). If the hot liquid soap is allowed to cool, it will not crystallize. It will instead form insoluble calcium-magnesium soap precipitates along with the calcium-magnesium salts found in hard water. The white powder has a density of 0.9 g/cm3 and a melting point between 232 and 235degC. The boiling point is 359.999oC when diluted to 760mmHg. The flashpoint is 270.099oC. Incompatible to strong oxidizing agents. Storage temperature: -20oC.
Preparation containing sodium oleate
This is made by neutralizing sodium hydroxide in an oleic ethanol solution.
Use phenolphthalein, an indicator, to titrate 10g of oleic in 100mL 95% ethanol. Once the equivalence is reached, the precipitated phenolphthalein can be used to determine the concentration. sodium Oleate Filter out the soap. If the precipitate fails to precipitate, you can still obtain the crude product after ethanol and water have been distilled. It can be recrystallized by using a solvent mixture of ethanol/ether.
Use of Sodium Oleate
1. Olive oil soap also contains tallow as its main ingredient.
2. Use as a food coating agents, for example, to coat the surface of fruits and vegetables. Can be combined with ethylene dioxide and high-boron fatty acids.
3. Mineral processing waterproof fabric
4. This product can be used in neutral and acidic solutions to prevent corrosion on aluminum and its alloys as well as iron, copper, or other metals.
5. As an anionic surfactant, it is also used as a fabric waterproofing agent.

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