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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 is an organic oil with a chemical formula of C17H33CO2Na. Sodium is the main component of soap made from olive oil and the main component of tallow soap. It can also be made by reacting sodium hy-droxide with oleic acid. It is a compound composed of two parts, a hy-drophobic base, and a hy-drophilic base. It has excellent emulsification, penetration, and detergency, and has good solubility in hot water. It is used as an anionic surfactant and fabric waterproofing agent. Basic information of sodium oleate
English name: SODIUM OLEATE
English alias: cis-Oleate sodium salt; cis-9-Octadecenoic acid sodium salt, Oleic acid sodium salt; eunatrol; Pionin D 951P; Oleic Acid Sodium Salt;
CAS Number: 143-19-1
Molecular formula: C18H33NaO2
Molecular weight: 304.44300
Accurate quality: 304.23800
PSA: 40.13000
LogP: 4.77380

Properties of sodium oleate
It can slowly oxidize and color in the air, make the color darker, and produce rancidity. This is because oleic acid is oxidized and the double bond is broken to produce rancid substances, such as nonanal. Mixing in highly unsaturated acids promotes corruption.
Dissolve in 10 times the amount of water, foam and form a viscous liquid. The aqueous solution is alkaline. Due to partial hy-drolysis into insoluble acid soap and sodium hy-droxide, the liquid becomes milky. It does not hy-drolyze in ethanol and is neutral. Dissolve in about 20 times the amount of ethanol. It is almost insoluble in ether, petroleum ether, and other organic solvents.
Hy-drolysis reaction: 2RCOONa+H2O=RCOONa*RCOOH+NaOH
chemical reaction
Reacts with metal ions other than alkali metals to produce metal salt precipitation.
Other properties
The nature of general salt is that it cannot be volatilized and can be completely dissociated into ions in water. After adding mineral acid (strong acid), the salt can be converted into hy-droxy acid and freed again. When the hot soap liquid is left cold, it does not crystallize and forms insoluble calcium and magnesium soap precipitates with the calcium and magnesium salts contained in the hard water. Appearance and properties: white powder; density: 0.9 g/cm3; melting point: 232-235degC(lit. ); boiling point: 359.999oC at 760 mmHg; flashpoint: 270.099oC; stability: Stable. Incompatible with strong oxidizing agents. Storage conditions: -20oC.
Sodium oleate preparation
It is obtained by neutralizing sodium hy-droxide or sodium carbonate in an oleic acid ethanol solution.
10g of oleic acid can be dissolved in 100mL of 95% ethanol, and then titrated with a 0.5mol/L sodium hy-droxide ethanol solution, using phenolphthalein as an indicator. After reaching the equivalence point, the precipitated sodium oleate soap is filtered out. If the precipitate does not precipitate, the crude product can also be obtained after the ethanol and water are distilled out, which can be recrystallized with a mixed solvent of ethanol and ether.
Sodium oleate use
1. The main ingredient of soap made from olive oil is also the main ingredient of tallow soap.
2. Used as a food coating agent, such as fruit and vegetable surface coating, and can be used together with ethylene oxide and high boron fatty alcohol.
3. Mineral processing, waterproof fabric.
4. It can be used as a corrosion inhibitor for aluminum and its alloys, iron, copper, and other metals in neutral or acidic solutions.
5. Used as anionic surfactant and fabric waterproofing agent

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