What is sodium oleate?

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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 whose chemical formula is 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 a hydrophobic base and a hybrid base. It is highly emulsifying, penetrates well, has detergency and is easily soluble in hot water. It’s used as a surfactant anionic and fabric waterproofing.

Basic Information on Sodium Oleate

English name: SODIUM OLEATE

Oleic Acid Salt (cis-Oleate)

CAS Number : 143-19-1

Formula molecular: C18H33NaO2

Molecular Weight: 304.44300

Accurate quality: 304.23800

PSA: 40.13000

LogP: 4.77380

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.


In ten times the water amount, dissolve in foam. Form a viscous solution. The aqueous solutions is alkaline. Liquid becomes milky because of partial hydrolysis to insoluble soap acid 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 dissociated completely into ions. The salt can be converted to hydroxy-acid by adding mineral acid. 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 the hardwater. 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 conditions: -20oC.

Sodium oleate preparation

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 product can be diluted with 95% ethanol.

sodium Oleate

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 and many other metals.

5. As an anionic surfactant, it is also used as a fabric waterproofing agent.

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