CAS 57-11-4 Octadecanoic acid - Materials / Alfa Chemistry

NAVIGATION

Octadecanoic acid

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Catalog Number

ACM57114

CAS Number

57-11-4

Product Name

Octadecanoic acid

Structure

Category

Solubility Enhancing Reagents

Synonyms

Stearic acid

Description

Stearic acid is a white solid with a mild odor. Floats on water. (USCG, 1999);DryPowder; DryPowder, OtherSolid, Liquid; Liquid; OtherSolid; OtherSolid, Liquid; PelletsLargeCrystals; PelletsLargeCrystals, Liquid; PelletsLargeCrystals, WetSolid, OtherSolid; WetSolid, Liquid;Solid;Solid;WHITE CRYSTALS OR POWDER WITH CHARACTERISTIC ODOUR.;hard, white or faintly yellowish crystalline solid/tallow odour;White solid with a mild odor.

IUPAC Name

octadecanoic acid

Molecular Weight

284.48

Molecular Formula

C18H36O2

Canonical SMILES

CCCCCCCCCCCCCCCCCC(=O)O

InChI

InChI=1S/C18H36O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20/h2-17H2,1H3,(H,19,20)

InChI Key

QIQXTHQIDYTFRH-UHFFFAOYSA-N

Boiling Point

361 °C (lit.)

Melting Point

67-72 °C (lit.)

Flash Point

385 °F (NTP, 1992);113 °C (235 °F) - closed cup;385 °F (196 dec C) (closed cup);196 °C;385°F

Density

0.86 at 68 °F (USCG, 1999);0.9408 g/cu cm at 20 °C;Relative density (water = 1): 0.94-0.83;0.86

Solubility

1 to 10 mg/mL at 73° F (NTP, 1992);2.10e-06 M;0.000597 mg/mL at 25 °C;In water, 0.568 mg/L at 25 °C;In water, 0.597 mg/L at 25 °C;Insoluble in water;Slightly soluble in ethanol, benzene; soluble in acetone, chloroform, carbon disulfide;1 gram dissolves in 21 mL alcohol, 5 mL benzene, 2 mL chloroform, 26 mL acetone, 6 mL carbon tetrachloride, 3.4 mL carbon disulfide; also soluble in amyl acetate, toluene;Soluble in alcohol, ether, chloroform, carbon disulfide, carbon tetrachloride;0.000597 mg/mL;Solubility in water: none;practically insoluble in water; soluble in alcohol, ether, chloroform;1 g in 20 ml alcohol (in ethanol)

Appearance

Solid

Application

Octadecanoic acid, also known as stearic acid, is a versatile fatty acid with an 18-carbon chain, commonly found in both animal and vegetable fats. It appears as a white, wax-like solid with a melting point of 70°C. This compound serves multiple purposes due to its ability to connect with other substances, acting as an emulsifier and thickening agent in various formulations. In the pharmaceutical industry, octadecanoic acid is primarily used as a lubricant in tablet and capsule production, contributing to their stability and release properties. It also enhances the consistency and texture of creams when partially neutralized with alkalis. In cosmetics, it functions as a stabilizing agent, while its use extends to the production of metallic stearates, soaps, lubricants, and additives in the manufacturing of PVC products. Through fractionation and other industrial processes, octadecanoic acid is refined for different applications, embodying nature's abundant and functional resource.

Storage

Room temperature

Color/Form

Monoclinic leaflets from alcohol;White or slightly yellow crystal masses, or white to slightly yellow powder;Colorless, wax-like solid;White amorphous solid or leaflets

Complexity

202

Covalently-Bonded Unit Count

EC Number

200-313-4;273-087-8

Exact Mass

284.27153g/mol

Formal Charge

Heavy Atom Count

ICSC Number

0568

Log P

8.23 (LogP);8.23;log Kow = 8.23;8.23

MeSH Entry Terms

aluminum monostearate;aluminum tristearate;ammonium stearate;calcium stearate;magnesium stearate;octadecanoic acid;sodium stearate;stearic acid;zinc stearate

Monoisotopic Mass

284.27153g/mol

NSC Number

25956

Odor

Slight odor suggesting tallow

Other Experimental

Does not congeal below 54 °C. Slowly volatilizes at 90 to 100 °C;Index of refraction: 1.4299 at 80 °C;Vapor pressure = 1 mm Hg at 173.1 °C;White, crystalline solid; odorless or practically so; MP 33-35 °C; BP 224 °C. Ethyl stearate of commerce solidifies at 20-24 °C; BP 180 deg at 4 mm Hg. Insoluble in water; soluble in alcohol or ether /Stearic acid ethyl ester/;White crystals. MP 38-389 °C; BP 215 °C at 15 mm Hg. Insoluble in water, soluble in alcohol, ether /Stearic acid , methyl ester/;Hydroxyl radical reaction rate constant = 2.25X10-11 cu cm/molec-sec at 25 °C (est)

Refractive Index

Index of refraction: 1.6130 at 20 °C

Rotatable Bond Count

RTECS Number

WI2800000

Stability

Stable under recommended storage conditions.

UNII

4ELV7Z65AP

Vapor Density

9.8 (NTP, 1992) (Relative to Air);9.80 (Air = 1);9.8

Vapor Pressure

1 mm Hg at 344.7 °F ; 5 mm Hg at 408.2° F (NTP, 1992);7.22e-07 mmHg;7.22X10-7 mm Hg at 25 °C (ext);Vapor pressure, Pa at 174 °C: 133;1 mmHg at 344.7°F; 5 mmHg at 408.2°F

Viscosity

9.87 mPa.sec (cP) at 70 °C

XLogP3

7.4

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