n-Heptane is defined as the
zero point of the octane rating scale. It is a lighter component in gasoline, burns more explosively, causing engine pre-ignition ( knocking) in its pure form, as opposed to octane isomers, which burn more slowly and give less knocking.
Chemical formula: C₇H₁₆
Melting point: −90.549 °C (−130.988 °F; 182.601 K)
Molar mass: 100.205 g·mol−1
Solubility in water: 0.0003% (20 °C)
n-Heptane is a colorless volatile liquid, insoluble in water, slightly soluble in methanol, and miscible in ether, chloroform, dichloromethane and other low polar solvents. It is mainly used as a standard for the determination of octane number. It can also be used as a raw material for anesthetics, solvents and organic synthesis, and the preparation of experimental reagents.
CAS No.: 142-82-5
Chinese Name: n-Heptane (正庚烷）
English Name: heptane
Numbering System
CAS No.: 142-82-5
MDL No.: MFCD00009544
EINECS No.: 205-563-8
RTECS No.: mi7700000
BRN No.: 1730763
PubChem No.: 24854818
Physical Property Data
1. Properties: colorless, transparent and volatile liquid. [1]
2. Melting point (℃): – 90.5 [2]
3. Boiling point (℃): 98.5 [3]
4. Relative density (water = 1): 0.68 [4]
5. Relative vapor density (air = 1): 3.45 [5]
6. Saturated vapor pressure (kPa): 6.36 (25 ℃) [6]
7. Combustion heat (kJ / mol): – 4806.6 [7]
8. Critical temperature (℃): 266 [8]
9. Critical pressure (MPA): 2.74 [9]
10. Octanol / water partition coefficient: 4.66 [10]
11. Flash point (℃): – 4 (CC)- 1（OC）[11]
12. Ignition temperature (℃): 215 [12]
13. Upper explosion limit (%): 6.7 [13]
14. Lower explosive limit (%): 1.05 [14]
15. Solubility: insoluble in water, soluble in ethanol and carbon tetrachloride, miscible in ether, chloroform, acetone and benzene. [15]
Viscosity of liquid: 409.0 MPa (s): 40
17. Ignition point (º C): 233
18. Heat of dissolution (kJ / mol): 14.059
19. Aniline point (º C): 70.6
20. Thermal conductivity (25 º C, liquid) / [w / (m · K)]: 122.25 × 10-3
21. Heat of formation (25 º C, liquid) / (kJ · mol): -224.54
22. Specific heat capacity (0 º C, constant pressure) / [kJ / (kg · K)]: 2.233
23. Critical density (g · cm-3): 0.234
24. Critical volume (cm3 · mol-1): 428
25. Critical compression factor: 0.261
26. Eccentricity factor: 0.351
27. Lennard Jones parameter (a): 6.7638
28. Lennard Jones parameter (k): 337.78
29. Solubility parameter (J · cm-3) 0.5:15.208
30. Van der Waals area (cm2 · mol-1): 1.099 × one thousand and ten
31. Van der Waals volume (cm3 · mol-1): 78.490
32. Standard combustion heat (enthalpy) of gas phase (kJ · mol-1): -4153.57
33. Gas phase standard claimed heat (enthalpy) (kJ · mol-1): -187.15
34. Standard entropy of gas phase (J · mol-1 · k-1): 428.1
35. Standard free energy of formation in gas phase (kJ · mol-1): 8.3
36. Gas phase standard hot melt (J · mol-1 · k-1): 165.2
37. Liquid phase standard combustion heat (enthalpy) (kJ · mol-1): -4817.00
38. Standard declared heat (enthalpy) of liquid phase (kJ · mol-1): -224.22
39. Standard entropy of liquid phase (J · mol-1 · k-1): 328.57
40. Standard free energy of formation in liquid phase (kJ · mol-1): 1.23
Standard molten phase (J · mol · 1-224)
Our production laboratory of high purity n-Heptane
| Chemical Synonyms: |
Normal Heptane |
Item: |
JPG0043561 |
| Formula: |
CH3(CH2)5CH3 |
Molecular weight: |
100.21 |
| Purity: |
99%+ |
CAS: |
142-82-5 |
| Application Date: |
For use in Liquid Chromatography,Spectrophotometry and Organic Residue Analysis,Packaged under Nitrogen. |
| Properties |
| Melting point: |
-91℃ |
Viscosity 20 ℃: |
|
| Boiling point: |
98℃ |
Merck Index 13th Edition: |
13,4679 |
| Density: |
0.684 at 25℃ （g/ml） |
Flash point: |
-1℃ |
| Dielectric Constant: |
1.92 at 20℃ |
Hazardous Material Identification System（HMIS）: |
1*-3-0 |
| Eluting value: |
|
Recommended storage code: |
RED |
| Refractive Index: |
1.387 （n20°/D） |
International Maritime Organization Hazard Class Code: |
3,UN1206,PG II |
| Specifications |
| Assay (by GC-FID) |
(as n-Heptane) |
|
≥99.0% |
|
(Heptane isomers and methylcyclohexane） |
≥99.5% |
| Color |
|
|
≤10 APHA |
| GC-ECD Responsive residue(single peak) |
|
|
|
(as Heptachlorepoxide) |
|
≤1 ppt |
| Fluorescence at emission maximum for Impurities |
|
|
|
(as Quinine sulfate) |
|
≤1 ppm |
| Residue after evaporation |
|
|
≤1 ppm |
| Water (by KF coulometry) |
|
|
≤0.02% |
| Optical absorbance at |
|
|
|
|
197 nm |
|
≤1.00 AU |
|
210 nm |
|
≤0.40 AU |
|
225 nm |
|
≤0.10 AU |
|
254 nm |
|
≤0.01 AU |
|
280 nm |
|
≤0.01 AU |
|
| PACKAGING |
| Product Number: |
JPG005611 |
Unit Size: |
MT |
Packaging Type: |
137kg Steel Drum
16MT ISO Tank |