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, 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 oleic and sodium hydroxide. It is composed of two components, a base hydrophobic and one hydrophilic. It has good emulsification properties, excellent penetration and detergency and is easily soluble in hot water. 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
Formula molecular: C18H33NaO2
Molecular Weight: 304.44300
Accurate quality: 304.23800
The properties of sodium oleate
This can cause rancidity and color to darken 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. The neutral liquid does not hydrolyze with 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
Reacts with other metal ions than alkali elements to produce metal salt precipitation.
It is the nature of salt that it can’t be volatilized but can be dissociated in water into ions. After adding mineral acids (strong acids), the salt is converted into hydroxy acid and can be freed again. 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 0.9g/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 conditions: -20oC.
Sodium oleate preparation
This is made by neutralizing sodium hydroxide in an oleic ethanol solution.
10g of oleic acids can be dissolved with 100mL 95% ethanol. A 0.5mol/L solution of sodium hydroxide in ethanol is then added and titrated, using phenolphthalein to indicate the equivalence point. Once the equivalence is reached, the precipitated product can be diluted with 95% ethanol.
Filter out the soap. If the precipitate fails to precipitate, you can still obtain the crude product after the water and ethanol are distilled. It can then be recrystallized by using a solvent mixture of ethanol with 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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