Octadecanoic acid

Formula: C₁₈H₃₆O₂
Molecular weight: 284.4772
IUPAC Standard 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)
IUPAC Standard InChIKey: QIQXTHQIDYTFRH-UHFFFAOYSA-N
CAS Registry Number: 57-11-4
Chemical structure:
This structure is also available as a 2d Mol file
Other names: Stearic acid; n-Octadecanoic acid; Humko Industrene R; Hydrofol Acid 150; Hystrene S-97; Hystrene T-70; Hystrene 80; Industrene R; Kam 1000; Kam 2000; Kam 3000; Neo-Fat 18; Neo-Fat 18-53; Neo-Fat 18-54; Neo-Fat 18-55; Neo-Fat 18-59; NAA 173; PD 185; Stearex Beads; Stearophanic acid; Steric acid; Vanicol; 1-Heptadecanecarboxylic acid; Heptadecanecarboxylic acid; Neo-fat 18-61; Pearl stearic; Century 1240; Dar-chem 14; Emersol 120; Emersol 132; Emersol 150; Formula 300; Glycon DP; Glycon TP; Glycon S-70; Glycon S-80; Glycon S-90; Groco 54; Groco 55; Groco 55L; Groco 58; Groco 59; Hy-phi 1199; Hy-phi 1205; Hy-phi 1303; Hy-phi 1401; Hydrofol acid 1655; Hydrofol acid 1855; Hydrofol 1895; Hystrene 4516; Hystrene 5016; Hystrene 7018; Hystrene 9718; Industrene 5016; Neo-Fat 18-S; Tegostearic 254; Tegostearic 255; Tegostearic 272; Cetylacetic acid; Industrene 8718; Industrene 9018; Barolub FTA; Loxiol G 20; Lunac S 20; Emersol 153; Century 1210; Century 1220; Century 1230; Emersol 6349; Hystrene 7018 FG; Hystrene 9718 NF FG; Industrene 4518; Industrene 7018 FG; n-Octadecylic acid; Pristerene 4904; Promulsin; Proviscol wax; Stearex; Tsubaki; Vis-Plus; Prifac 2918; Adeka Fatty Acid SA 910; Century 1224; Edenor C18; Hydrofol Acid 1895; Kiri stearic acid; Lunac S 40; SA 400 (fatty acid); WO 2 (fatty acid); Octadecanoic acid (stearic acid); Emersol 110 (Salt/Mix); Emery 400 (Salt/Mix)
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Normal melting point

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Data compiled by: Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director

T_fus (K)	Reference	Comment
342.30	Donnelly, Drewes, et al., 1990	Uncertainty assigned by TRC = 0.2 K; TRC
342.5	Ksiazczak and Parczewska, 1988	Crystal phase 1 phase; Uncertainty assigned by TRC = 0.2 K; derived from vapor pressure of s-l mixts. with benzene and cyclohexane; TRC
339.35	Ksiazczak and Parczewska, 1988	Crystal phase 2 phase; Uncertainty assigned by TRC = 0.2 K; derived from vapor pressure of s-l mixts. with benzene and cyclohexane. for metastable equilibrium; TRC
342.75	Gaikwad and Subrahmanyam, 1985	Uncertainty assigned by TRC = 0.3 K; TRC
346.	Beckmann, Rouquerol, et al., 1983	Uncertainty assigned by TRC = 2. K; TRC
339.3	Berchiesi, Cingolani, et al., 1982	Uncertainty assigned by TRC = 0.3 K; TRC
339.3	Berchiesi, 1981	Uncertainty assigned by TRC = 0.4 K; TRC
339.3	Berchiesi, 1981, 2	Uncertainty assigned by TRC = 0.4 K; TRC
339.3	Berchiesi, 1981, 3	Uncertainty assigned by TRC = 0.4 K; TRC
339.3	Berchiesi, 1981, 4	Uncertainty assigned by TRC = 0.4 K; TRC
339.3	Berchiesi, 1981, 5	Uncertainty assigned by TRC = 0.4 K; TRC
339.3	Berchiesi, 1981, 6	Uncertainty assigned by TRC = 0.4 K; TRC
342.	Brandreth and Johnson, 1971	Uncertainty assigned by TRC = 2. K; temp. of maximum in DTA curve; TRC
341.	Brandreth and Johnson, 1971	Uncertainty assigned by TRC = 2. K; temp. of maximum of DTA curve; TRC
342.	Brandreth and Johnson, 1971	Uncertainty assigned by TRC = 2. K; TRC
342.	Brandreth and Johnson, 1971	Uncertainty assigned by TRC = 2. K; TRC
342.	Brandreth and Johnson, 1971	Uncertainty assigned by TRC = 2. K; TRC
342.	Brandreth and Johnson, 1971	Uncertainty assigned by TRC = 2. K; TRC
342.	Brandreth and Johnson, 1971	Uncertainty assigned by TRC = 2. K; TRC
342.6	Adriaanse, Dekker, et al., 1964	Uncertainty assigned by TRC = 0.05 K; TRC
342.45	Mod, Magne, et al., 1962	Uncertainty assigned by TRC = 0.3 K; TRC
342.45	Mod, Magne, et al., 1960	Uncertainty assigned by TRC = 0.3 K; TRC
342.4	Costello and Bowden, 1958	Uncertainty assigned by TRC = 0.6 K; TRC
341.7	Kurtz, 1952	Uncertainty assigned by TRC = 0.8 K; TRC
342.	Myers, 1951	Uncertainty assigned by TRC = 2. K; TRC
332.	Myers, 1951	Uncertainty assigned by TRC = 2. K; TRC; Data excluded from overall average
342.5	Boelhouwer, Nederbragt, et al., 1950	Uncertainty assigned by TRC = 0.5 K; TRC
342.60	Backer and Strating, 1940	Uncertainty assigned by TRC = 0.8 K; TRC
340.85	Biltz, Fischer, et al., 1930	Uncertainty assigned by TRC = 1. K; TRC
341.53	Hulett, 1899	Uncertainty assigned by TRC = 0.3 K; TRC
337.15	Bruner, 1894	Uncertainty assigned by TRC = 0.5 K; TRC
342.	Krafft, 1882	Uncertainty assigned by TRC = 3. K; TRC

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:

References

Go To: Top, Normal melting point, Notes

Donnelly, Drewes, et al., 1990
Donnelly, J.R.; Drewes, L.A.; Johnson, R.L.; Munslow, W.D.; Knapp, K.K.; Sovocool, G.W., Purity and heat of fusion data for environmental standards as determined by differential scanning calorimetry, Thermochim. Acta, 1990, 167, 2, 155, https://doi.org/10.1016/0040-6031(90)80476-F . [all data]

Ksiazczak and Parczewska, 1988
Ksiazczak, A.; Parczewska, B., Vapour pressures of binary three-phase (solid+liquid+vapour) mixtures I. Melting temperatures of polymorphic phases, J. Chem. Thermodyn., 1988, 20, 785-90. [all data]

Gaikwad and Subrahmanyam, 1985
Gaikwad, B.R.; Subrahmanyam, V.V., Melting behavior of fatty alcohols and their binary blends., J. Indian Chem. Soc., 1985, 62, 513. [all data]

Beckmann, Rouquerol, et al., 1983
Beckmann, W.; Rouquerol, F.; Beckmann, H., Calorimetric determination of the heats of dissolution of stearic acid in some organic solvents., Thermochim. Acta, 1983, 66, 295. [all data]

Berchiesi, Cingolani, et al., 1982
Berchiesi, G.; Cingolani, A.; Leonesi, D., Int. DATA Ser., Sel. Data Mixtures, Ser. A, 1982, 1, 9. [all data]

Berchiesi, 1981
Berchiesi, M.A., Int. DATA Ser., Sel. Data Mixtures, Ser. A, 1981, No. 2, 121. [all data]

Berchiesi, 1981, 2
Berchiesi, M.A., Int. DATA Ser., Sel. Data Mixtures, Ser. A, 1981, No. 2, 122. [all data]

Berchiesi, 1981, 3
Berchiesi, M.A., Int. DATA Ser., Sel. Data Mixtures, Ser. A, 1981, No. 2, 123. [all data]

Berchiesi, 1981, 4
Berchiesi, M.A., Int. DATA Ser., Sel. Data Mixtures, Ser. A, 1981, No. 2, 124. [all data]

Berchiesi, 1981, 5
Berchiesi, M.A., Int. DATA Ser., Sel. Data Mixtures, Ser. A, 1981, No. 2, 125. [all data]

Berchiesi, 1981, 6
Berchiesi, M.A., Int. DATA Ser., Sel. Data Mixtures, Ser. A, 1981, No. 2, 126. [all data]

Brandreth and Johnson, 1971
Brandreth, D.A.; Johnson, R.E., Solubility of Stearic Acid in Some Halofluorocarbons, Chlorocarbons, Ethanol, and Their Azeotropes, J. Chem. Eng. Data, 1971, 16, 325. [all data]

Adriaanse, Dekker, et al., 1964
Adriaanse, N.; Dekker, H.; Coops, J., Some Physical Constants of Normal, Saturated Fatty Acids and Their Methyl Esters, Recl. Trav. Chim. Pays-Bas, 1964, 83, 557. [all data]

Mod, Magne, et al., 1962
Mod, R.R.; Magne, F.C.; Skau, E.L., J. Chem. Eng. Data, 1962, 7, 31. [all data]

Mod, Magne, et al., 1960
Mod, R.R.; Magne, F.C.; Skau, E.L., Pure Acid-Free Amides of C18 Fatty Acids. Their Preparation and Binary Freezing Point Behavior, J. Chem. Eng. Data, 1960, 5, 478. [all data]

Costello and Bowden, 1958
Costello, J.M.; Bowden, S.T., The temperature variation of orthobaric density difference in liquid- vapour systems: IV fatty acids, Recl. Trav. Chim. Pays-Bas, 1958, 77, 803. [all data]

Kurtz, 1952
Kurtz, F.E., Chromatography of Methayl Stearate, Methyl Oleate, Methy Linoleate and Methyl Linolenate: A COncept of AMplified Chromatographic Separations, J. Am. Chem. Soc., 1952, 74, 1902-9. [all data]

Myers, 1951
Myers, G.S., 2-Octadecenoic Acid I> Preparation and SOme Reactions of the cis and trans Isomers, J. Am. Chem. Soc., 1951, 73, 2100-4. [all data]

Boelhouwer, Nederbragt, et al., 1950
Boelhouwer, J.W.M.; Nederbragt, G.W.; Verberg, G.W., Viscosity data of organic liquids, Appl. Sci. Res., Sect. A, 1950, 2, 249. [all data]

Backer and Strating, 1940
Backer, H.J.; Strating, J., Synthesis of some aliphatic hydrocarbons crystallized in the pure state: II, Recl. Trav. Chim. Pays-Bas, 1940, 59, 933. [all data]

Biltz, Fischer, et al., 1930
Biltz, W.; Fischer, W.; Wunnenberg, E., Molecular and Atomic Volumes. The Volume Requirements of Crystalline Organic Compounds and Low Temperatures, Z. Phys. Chem., Abt. A, 1930, 151, 13-55. [all data]

Hulett, 1899
Hulett, G.A., Z. Phys. Chem., Stoechiom. Verwandtschaftsl., 1899, 28, 629. [all data]

Bruner, 1894
Bruner, L., The heats of fusion of some organic compounds, Ber. Dtsch. Chem. Ges., 1894, 27, 2102. [all data]

Krafft, 1882
Krafft, F., On Nineteen Higher Normal Paraffins and a Simple Volume Law for Liquids that form Drops I., Ber. Dtsch. Chem. Ges., 1882, 15, 1687-711. [all data]

Notes

Go To: Top, Normal melting point, References

Symbols used in this document:

T_fus Fusion (melting) point
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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